diff --git a/charts.api.php b/charts.api.php
index cdd8c6ac5d2dfb60ebe428ae28d9df7d06acdd35..d9caeab5f42a450f5692b91e75f9dfc234935f60 100644
--- a/charts.api.php
+++ b/charts.api.php
@@ -1,9 +1,8 @@
 <?php
 
-use Drupal\charts\Theme\ChartsInterface;
-
 /**
  * @file
+ *
  * Documentation on hooks provided by the Charts module.
  *
  * Charts module provides 4 element types that can be used to construct a chart.
@@ -50,10 +49,12 @@ use Drupal\charts\Theme\ChartsInterface;
  * chart_data, chart_xaxis, and chart_yaxis). For a full list, see the
  * charts_element_info() function.
  *
- *
  * @see charts_element_info()
- *
- *
+ */
+ 
+use Drupal\charts\Theme\ChartsInterface;
+
+/**
  * Alter an individual chart before it is printed.
  *
  * @param $chart
@@ -76,7 +77,9 @@ function hook_chart_alter(&$chart, $chart_id) {
  * name instead of being passed in as an argument.
  *
  * @see hook_chart_alter()
- * @param $chart
+ *
+ * @param mixed $chart
+ *   Chart.
  */
 function hook_chart_CHART_ID_alter(&$chart) {
 }
@@ -93,13 +96,14 @@ function hook_chart_CHART_ID_alter(&$chart) {
  * Even though this hook may be fragile, it may provide developers with access
  * to library-specific functionality.
  *
- * @param $definition
+ * @param mixed $definition
  *   The chart definition to be modified. The raw values are passed directly to
  *   the charting library.
- * @param $chart
+ * @param mixed $chart
  *   The chart renderable. This may be used for reference (or read to add
  *   support for new properties), but any changes to this variable will not
  *   have an effect on output.
+ *
  * @internal param $chart_id The chart ID, derived from the $chart['#chart_id'] property. Note that not*   The chart ID, derived from the $chart['#chart_id'] property. Note that not
  *   all charts may have a $chart_id.
  */
@@ -111,8 +115,11 @@ function hook_chart_definition_alter(&$definition, $chart) {
  *
  * Same as hook_chart_definition_alter(), only including the $chart_id in the
  * function name instead of being passed in as an argument.
+ *
  * @see hook_chart_definition_alter()
+ *
  * @param $chart
+ *   Chart.
  */
 function hook_chart_definition_CHART_ID_alter(&$chart) {
 }
@@ -133,7 +140,7 @@ function hook_charts_info() {
     // Specify the chart types your library is capable of providing.
     'types' => ['area', 'bar', 'column', 'donut', 'line', 'pie', 'scatter'],
     // If your callback function is in a separate file, specify it's location.
-    // 'file' => 'includes/my_charting_library.inc',
+    /* 'file' => 'includes/my_charting_library.inc', */
   ];
   return $info;
 }
@@ -143,7 +150,9 @@ function hook_charts_info() {
  *
  * If your module needs to modify the capabilities of a charting library, such
  * as to add support for a new chart type, it may do so with this hook.
- * @param $info
+ *
+ * @param array $info
+ *   Info.
  */
 function hook_charts_info_alter(&$info) {
   // Say the Google charts library supports geo charts.
@@ -167,7 +176,8 @@ function hook_charts_type_info() {
     // Many charting libraries always refer to the main axis as the "y-axis",
     // even if the chart's main axis is horizontal. An example of this is a
     // bar chart, where the values are along the horizontal axis.
-    'axis_inverted' => TRUE, // Meaning x/y axis are flipped.
+    // Meaning x/y axis are flipped.
+    'axis_inverted' => TRUE,
     // For bar/area/other charts that support stacking of series, set this value
     // to TRUE.
     'stacking' => TRUE,
@@ -180,7 +190,9 @@ function hook_charts_type_info() {
  *
  * If your module needs to modify the capabilities or labels of a paricular
  * chart type, it may alter the definitions provided by other modules.
- * @param $chart_types
+ *
+ * @param array $chart_types
+ *   Chart Types.
  */
 function hook_charts_type_info_alter(&$chart_types) {
   $chart_types['bar']['stacking'] = FALSE;
diff --git a/includes/charts.pages.inc b/includes/charts.pages.inc
index 1405b5ed8338ef49f864c67433e6c583ddb1a042..dc43888307c1dc5f927f47c395158e4ee56abadc 100644
--- a/includes/charts.pages.inc
+++ b/includes/charts.pages.inc
@@ -2,8 +2,10 @@
 
 /**
  * @file
+ *
  * Menu callbacks for Charts module.
  */
+
 use Drupal\charts\Theme\ChartsInterface;
 
 /**
@@ -20,8 +22,8 @@ use Drupal\charts\Theme\ChartsInterface;
  *   namespace, an array of parent names that will be prepended to each
  *   element's #parents property.
  *
- * @return mixed The form with the chart settings added.
- * The form with the chart settings added.
+ * @return mixed
+ *   The form with the chart settings added.
  */
 
 /**
@@ -34,8 +36,7 @@ function charts_info() {
   $charts_info = [];
   $chart_modules = Drupal::moduleHandler()->getImplementations('charts_info');
   foreach ($chart_modules as $module) {
-    $module_charts_info = Drupal::moduleHandler()
-      ->invoke($module, 'charts_info');
+    $module_charts_info = Drupal::moduleHandler()->invoke($module, 'charts_info');
     foreach ($module_charts_info as $chart_library => $chart_library_info) {
       $module_charts_info[$chart_library]['module'] = $module;
     }
@@ -57,10 +58,10 @@ function charts_type_info() {
 
   foreach ($charts_type_info as $chart_type => $chart_type_info) {
     $charts_type_info[$chart_type] += [
-      'label' => '',
-      'axis' => ChartsInterface::CHARTS_DUAL_AXIS,
+      'label'         => '',
+      'axis'          => ChartsInterface::CHARTS_DUAL_AXIS,
       'axis_inverted' => FALSE,
-      'stacking' => FALSE,
+      'stacking'      => FALSE,
     ];
   }
 
@@ -72,10 +73,10 @@ function charts_type_info() {
  * Retrieve a specific chart type.
  *
  * @param string $chart_type
- * The type of chart selected for display.
+ *   The type of chart selected for display.
  *
  * @return mixed
- * If not false, returns an array of values from charts_charts_type_info.
+ *   If not false, returns an array of values from charts_charts_type_info.
  */
 function charts_get_type($chart_type) {
   $types = charts_type_info();
@@ -86,39 +87,44 @@ function charts_get_type($chart_type) {
  * Implements hook_charts_type_info().
  */
 function charts_charts_type_info() {
-  $chart_types['pie'] = [
-    'label' => t('Pie'),
-    'axis' => ChartsInterface::CHARTS_SINGLE_AXIS,
-  ];
-  $chart_types['bar'] = [
-    'label' => t('Bar'),
-    'axis' => ChartsInterface::CHARTS_DUAL_AXIS,
-    'axis_inverted' => TRUE,
-    'stacking' => TRUE,
-  ];
-  $chart_types['column'] = [
-    'label' => t('Column'),
-    'axis' => ChartsInterface::CHARTS_DUAL_AXIS,
-    'stacking' => TRUE,
-  ];
-  $chart_types['line'] = [
-    'label' => t('Line'),
-    'axis' => ChartsInterface::CHARTS_DUAL_AXIS,
-  ];
-  $chart_types['area'] = [
-    'label' => t('Area'),
-    'axis' => ChartsInterface::CHARTS_DUAL_AXIS,
-    'stacking' => TRUE,
-  ];
-  $chart_types['scatter'] = [
-    'label' => t('Scatter'),
-    'axis' => ChartsInterface::CHARTS_DUAL_AXIS,
+
+  return [
+    'pie'     => [
+      'label' => t('Pie'),
+      'axis'  => ChartsInterface::CHARTS_SINGLE_AXIS,
+    ],
+    'bar'     => [
+      'label'         => t('Bar'),
+      'axis'          => ChartsInterface::CHARTS_DUAL_AXIS,
+      'axis_inverted' => TRUE,
+      'stacking'      => TRUE,
+    ],
+    'column'  => [
+      'label'    => t('Column'),
+      'axis'     => ChartsInterface::CHARTS_DUAL_AXIS,
+      'stacking' => TRUE,
+    ],
+    'line'    => [
+      'label' => t('Line'),
+      'axis'  => ChartsInterface::CHARTS_DUAL_AXIS,
+    ],
+    'area'    => [
+      'label'    => t('Area'),
+      'axis'     => ChartsInterface::CHARTS_DUAL_AXIS,
+      'stacking' => TRUE,
+    ],
+    'scatter' => [
+      'label' => t('Scatter'),
+      'axis'  => ChartsInterface::CHARTS_DUAL_AXIS,
+    ],
   ];
-  return $chart_types;
 }
 
 /**
  * Default colors used in all libraries.
+ *
+ * @return array
+ *   Default Colors.
  */
 function charts_default_colors() {
   return [
@@ -138,14 +144,15 @@ function charts_default_colors() {
 /**
  * Recursive function to trim out empty options that aren't used.
  *
- * @param array $array
- * Array may contain empty options.
+ * @param mixed $array
+ *   Array may contain empty options.
  */
 function charts_trim_array(&$array) {
   foreach ($array as $key => &$value) {
     if (is_array($value)) {
       charts_trim_array($value);
-    } elseif (is_null($value) || (is_array($value) && count($value) === 0)) {
+    }
+    elseif (is_null($value) || (is_array($value) && count($value) === 0)) {
       unset($array[$key]);
     }
   }
@@ -155,7 +162,7 @@ function charts_trim_array(&$array) {
  * Recursive function to cast integer values.
  *
  * @param mixed $element
- * Cast options to integers to avoid redundant library fixing problems.
+ *   Cast options to integers to avoid redundant library fixing problems.
  */
 function charts_cast_element_integer_values(&$element) {
   $integer_options = [
@@ -179,53 +186,60 @@ function charts_cast_element_integer_values(&$element) {
   foreach ($element as $property_name => $value) {
     if (is_array($element[$property_name])) {
       charts_cast_element_integer_values($element[$property_name]);
-    } elseif ($property_name && in_array($property_name, $integer_options)) {
-      $element[$property_name] = (is_null($element[$property_name]) || strlen($element[$property_name]) === 0)
-        ? NULL : (int)$element[$property_name];
+    }
+    elseif ($property_name && in_array($property_name, $integer_options)) {
+      $element[$property_name] = (is_null($element[$property_name]) || strlen($element[$property_name]) === 0) ? NULL : (int) $element[$property_name];
     }
   }
 }
 
 /**
- * @param $form
- * @param array $defaults
- * @param array $field_options
- * @param array $parents
+ * Charts Settings Form.
+ *
+ * @param mixed $form
+ *   Form.
+ * @param mixed $defaults
+ *   Defaults.
+ * @param mixed $field_options
+ *   Field Options.
+ * @param mixed $parents
+ *   Parents.
  *
  * @return mixed
+ *   Form.
  */
 function charts_settings_form($form, $defaults = [], $field_options = [], $parents = []) {
+
   // Ensure all defaults are set.
   $options = array_merge(charts_default_settings(), $defaults);
 
-  //using plugins to get the available installed libraries
+  // Using plugins to get the available installed libraries.
   $plugin_manager = \Drupal::service('plugin.manager.charts');
   $plugin_definitions = $plugin_manager->getDefinitions();
   $library_options = [];
 
-  foreach ($plugin_definitions as $plugin_definition){
-      $library_options[$plugin_definition['id']] = $plugin_definition['name'];
+  foreach ($plugin_definitions as $plugin_definition) {
+    $library_options[$plugin_definition['id']] = $plugin_definition['name'];
   }
 
-  // Get a list of available chart libraries if plugins have not been implemented.
-    // This will be removed as ModuleSelector is now @deprecated
-
-  if (empty($library_options)){
-      $charts_info = charts_info();
-      $library_options = [];
-      foreach ($charts_info as $library_name => $library_info) {
-
-          if (Drupal::moduleHandler()->moduleExists($charts_info[$library_name]['module'])) {
-              $library_options[$library_name] = $library_info['label'];
-          }
-      }
-      if (empty($library_options)) {
-          drupal_set_message(t('There are no enabled charting libraries. Please enable a Charts sub-module.'));
+  // Get a list of available chart libraries if plugins have not been
+  // implemented. This will be removed as ModuleSelector is now @deprecated.
+  if (empty($library_options)) {
+    $charts_info = charts_info();
+    $library_options = [];
+    foreach ($charts_info as $library_name => $library_info) {
+      if (Drupal::moduleHandler()->moduleExists($charts_info[$library_name]['module'])) {
+        $library_options[$library_name] = $library_info['label'];
       }
+    }
+    if (empty($library_options)) {
+      drupal_set_message(t('There are no enabled charting libraries. Please enable a Charts sub-module.'));
+    }
   }
 
+/*
   // Get a list of available chart libraries.
-  /*$charts_info = charts_info();
+  $charts_info = charts_info();
   $library_options = [];
   foreach ($charts_info as $library_name => $library_info) {
     if (Drupal::moduleHandler()->moduleExists($charts_info[$library_name]['module'])) {
@@ -234,17 +248,19 @@ function charts_settings_form($form, $defaults = [], $field_options = [], $paren
   }
   if (count($library_options) == 0) {
     drupal_set_message(t('There are no enabled charting libraries. Please enable a Charts sub-module.'));
-  }*/
+  }
+*/
+
   $form['library'] = [
-    '#title' => t('Charting library'),
-    '#type' => 'select',
-    '#options' => $library_options,
+    '#title'         => t('Charting library'),
+    '#type'          => 'select',
+    '#options'       => $library_options,
     '#default_value' => $options['library'],
-    '#required' => TRUE,
-    '#access' => count($library_options) > 0,
-    '#attributes' => ['class' => ['chart-library-select']],
-    '#weight' => -15,
-    '#parents' => array_merge($parents, ['library']),
+    '#required'      => TRUE,
+    '#access'        => count($library_options) > 0,
+    '#attributes'    => ['class' => ['chart-library-select']],
+    '#weight'        => -15,
+    '#parents'       => array_merge($parents, ['library']),
   ];
 
   $chart_types = charts_type_info();
@@ -253,19 +269,19 @@ function charts_settings_form($form, $defaults = [], $field_options = [], $paren
     $type_options[$chart_type] = $chart_type_info['label'];
   }
   $form['type'] = [
-    '#title' => t('Chart type'),
-    '#type' => 'radios',
+    '#title'         => t('Chart type'),
+    '#type'          => 'radios',
     '#default_value' => $options['type'],
-    '#options' => $type_options,
-    '#required' => TRUE,
-    '#weight' => -20,
-    '#attributes' => [
+    '#options'       => $type_options,
+    '#required'      => TRUE,
+    '#weight'        => -20,
+    '#attributes'    => [
       'class' => [
         'chart-type-radios',
         'container-inline',
       ],
     ],
-    '#parents' => array_merge($parents, ['type']),
+    '#parents'       => array_merge($parents, ['type']),
   ];
 
   // Set data attributes to identify special properties of different types.
@@ -281,284 +297,298 @@ function charts_settings_form($form, $defaults = [], $field_options = [], $paren
   if ($field_options) {
     $first_field = key($field_options);
 
-    // $form['#theme'] = 'charts_settings_fields';
-    $form['fields'] = [
+    /* $form['#theme'] = 'charts_settings_fields'; */
+
+    $form['fields']                = [
       '#title' => t('Charts fields'),
-      '#type' => 'fieldset',
+      '#type'  => 'fieldset',
     ];
+
     $form['fields']['label_field'] = [
-      '#type' => 'radios',
-      '#title' => t('Label field'),
-      '#options' => $field_options + ['' => t('No label field')],
+      '#type'          => 'radios',
+      '#title'         => t('Label field'),
+      '#options'       => $field_options + ['' => t('No label field')],
       '#default_value' => isset($options['label_field']) ? $options['label_field'] : $first_field,
-      '#weight' => -10,
-      '#parents' => array_merge($parents, ['label_field']),
+      '#weight'        => -10,
+      '#parents'       => array_merge($parents, ['label_field']),
     ];
-    $form['fields']['table'] = [
-      '#type' => 'table',
-      '#header' => [t('Field Name'), t('Provides Data'), t('Color')],
+
+    $form['fields']['table']       = [
+      '#type'      => 'table',
+      '#header'    => [t('Field Name'), t('Provides Data'), t('Color')],
       '#tabledrag' => TRUE,
     ];
 
     $field_count = 0;
     foreach ($field_options as $field_name => $field_label) {
-      $form['fields']['table'][$field_count]['label_label'] = [
-        '#type' => 'label',
-        '#title' => $field_label,
+      $form['fields']['table'][$field_count]['label_label']               = [
+        '#type'   => 'label',
+        '#title'  => $field_label,
         '#column' => 'one',
       ];
-      $form['fields']['table'][$field_count]['data_fields'][$field_name] = [
-        '#type' => 'checkbox',
-        '#title' => $field_name,
+
+      $form['fields']['table'][$field_count]['data_fields'][$field_name]  = [
+        '#type'          => 'checkbox',
+        '#title'         => $field_name,
         '#default_value' => $options['data_fields'][$field_name],
-        '#return_value' => $field_name,
-        '#weight' => -9,
-        '#states' => [
+        '#return_value'  => $field_name,
+        '#weight'        => -9,
+        '#states'        => [
           'disabled' => [
             ':input[name="style_options[label_field]"]' => ['value' => $field_name],
           ],
         ],
-        '#parents' => array_merge($parents, ['data_fields', $field_name]),
-        '#column' => 'two',
+        '#parents'       => array_merge($parents, ['data_fields', $field_name]),
+        '#column'        => 'two',
       ];
+
       $form['fields']['table'][$field_count]['field_colors'][$field_name] = [
-        '#type' => 'textfield',
-        '#attributes' => ['TYPE' => 'color'],
-        '#size' => 10,
-        '#maxlength' => 7,
+        '#type'           => 'textfield',
+        '#attributes'     => ['TYPE' => 'color'],
+        '#size'           => 10,
+        '#maxlength'      => 7,
         '#theme_wrappers' => [],
-        '#default_value' => !empty($options['field_colors'][$field_name]) ? $options['field_colors'][$field_name] : $options['colors'][$field_count],
-        '#parents' => array_merge($parents, ['field_colors', $field_name]),
-        '#column' => 'three',
+        '#default_value'  => !empty($options['field_colors'][$field_name]) ? $options['field_colors'][$field_name] : $options['colors'][$field_count],
+        '#parents'        => array_merge($parents, ['field_colors', $field_name]),
+        '#column'         => 'three',
       ];
       $field_count++;
-
     }
-
   }
-  $form['display'] = [
-    '#title' => t('Display'),
-    '#type' => 'fieldset',
+
+  $form['display']                   = [
+    '#title'       => t('Display'),
+    '#type'        => 'fieldset',
     '#collapsible' => TRUE,
-    '#collapsed' => TRUE,
+    '#collapsed'   => TRUE,
   ];
-  $form['display']['title'] = [
-    '#title' => t('Chart title'),
-    '#type' => 'textfield',
+
+  $form['display']['title']          = [
+    '#title'         => t('Chart title'),
+    '#type'          => 'textfield',
     '#default_value' => $options['title'],
-    '#parents' => array_merge($parents, ['title']),
+    '#parents'       => array_merge($parents, ['title']),
   ];
+
   $form['display']['title_position'] = [
-    '#title' => t('Title position'),
-    '#type' => 'select',
-    '#options' => [
-      '' => t('None'),
+    '#title'         => t('Title position'),
+    '#type'          => 'select',
+    '#options'       => [
+      ''    => t('None'),
       'out' => t('Outside'),
-      'in' => t('Inside'),
+      'in'  => t('Inside'),
     ],
     '#default_value' => $options['title_position'],
-    '#parents' => array_merge($parents, ['title_position']),
+    '#parents'       => array_merge($parents, ['title_position']),
   ];
 
   $form['display']['tooltips'] = [
-    '#title' => t('Tooltips'),
-    '#type' => 'select',
-    '#options' => [
-      '' => t('Disabled'),
+    '#title'         => t('Tooltips'),
+    '#type'          => 'select',
+    '#options'       => [
+      ''     => t('Disabled'),
       'TRUE' => t('Enabled'),
     ],
-    '#description' => t('Show data details on mouse over? Note: unavailable for print or on mobile devices.'),
+    '#description'   => t('Show data details on mouse over? Note: unavailable for print or on mobile devices.'),
     '#default_value' => $options['tooltips'],
-    '#parents' => array_merge($parents, ['tooltips']),
+    '#parents'       => array_merge($parents, ['tooltips']),
   ];
 
   $form['display']['data_labels'] = [
-    '#title' => t('Data labels'),
-    '#type' => 'select',
-    '#options' => [
-      '' => t('Disabled'),
+    '#title'         => t('Data labels'),
+    '#type'          => 'select',
+    '#options'       => [
+      ''     => t('Disabled'),
       'TRUE' => t('Enabled'),
     ],
     '#default_value' => $options['data_labels'],
-    '#description' => t('Show data details as labels on chart? Note: recommended for print or on mobile devices.'),
-    '#parents' => array_merge($parents, ['data_labels']),
+    '#description'   => t('Show data details as labels on chart? Note: recommended for print or on mobile devices.'),
+    '#parents'       => array_merge($parents, ['data_labels']),
   ];
 
   $form['display']['legend_position'] = [
-    '#title' => t('Legend position'),
-    '#type' => 'select',
-    '#options' => [
-      '' => t('None'),
-      'top' => t('Top'),
-      'right' => t('Right'),
+    '#title'         => t('Legend position'),
+    '#type'          => 'select',
+    '#options'       => [
+      ''       => t('None'),
+      'top'    => t('Top'),
+      'right'  => t('Right'),
       'bottom' => t('Bottom'),
-      'left' => t('Left'),
+      'left'   => t('Left'),
     ],
     '#default_value' => $options['legend_position'],
-    '#parents' => array_merge($parents, ['legend_position']),
+    '#parents'       => array_merge($parents, ['legend_position']),
   ];
 
   $form['display']['background'] = [
-    '#title' => t('Background color'),
-    '#type' => 'textfield',
-    '#size' => 10,
-    '#maxlength' => 7,
-    '#attributes' => ['placeholder' => t('transparent')],
-    '#description' => t('Leave blank for a transparent background.'),
+    '#title'         => t('Background color'),
+    '#type'          => 'textfield',
+    '#size'          => 10,
+    '#maxlength'     => 7,
+    '#attributes'    => ['placeholder' => t('transparent')],
+    '#description'   => t('Leave blank for a transparent background.'),
     '#default_value' => $options['background'],
-    '#parents' => array_merge($parents, ['background']),
+    '#parents'       => array_merge($parents, ['background']),
   ];
 
-  $form['display']['dimensions'] = [
-    '#title' => t('Dimensions'),
+  $form['display']['dimensions']           = [
+    '#title'          => t('Dimensions'),
     '#theme_wrappers' => ['form_element'],
-    '#description' => t('If dimensions are left empty, the chart will fill its containing element.'),
+    '#description'    => t('If dimensions are left empty, the chart will fill its containing element.'),
   ];
-  $form['display']['dimensions']['width'] = [
-    '#type' => 'textfield',
-    '#attributes' => [
-      'TYPE' => 'number',
-      'step' => 1,
-      'min' => 0,
-      'max' => 9999,
+
+  $form['display']['dimensions']['width']  = [
+    '#type'           => 'textfield',
+    '#attributes'     => [
+      'TYPE'        => 'number',
+      'step'        => 1,
+      'min'         => 0,
+      'max'         => 9999,
       'placeholder' => t('auto'),
     ],
-    '#default_value' => $options['width'],
-    '#size' => 8,
-    '#suffix' => ' x ',
+    '#default_value'  => $options['width'],
+    '#size'           => 8,
+    '#suffix'         => ' x ',
     '#theme_wrappers' => [],
-    '#parents' => array_merge($parents, ['width']),
+    '#parents'        => array_merge($parents, ['width']),
   ];
+
   $form['display']['dimensions']['height'] = [
-    '#type' => 'textfield',
-    '#attributes' => [
-      'TYPE' => 'number',
-      'step' => 1,
-      'min' => 0,
-      'max' => 9999,
+    '#type'           => 'textfield',
+    '#attributes'     => [
+      'TYPE'        => 'number',
+      'step'        => 1,
+      'min'         => 0,
+      'max'         => 9999,
       'placeholder' => t('auto'),
     ],
-    '#default_value' => $options['height'],
-    '#size' => 8,
-    '#suffix' => ' px',
+    '#default_value'  => $options['height'],
+    '#size'           => 8,
+    '#suffix'         => ' px',
     '#theme_wrappers' => [],
-    '#parents' => array_merge($parents, ['height']),
+    '#parents'        => array_merge($parents, ['height']),
   ];
 
-  $form['xaxis'] = [
-    '#title' => t('Horizontal axis'),
-    '#type' => 'fieldset',
+  $form['xaxis']                    = [
+    '#title'       => t('Horizontal axis'),
+    '#type'        => 'fieldset',
     '#collapsible' => TRUE,
-    '#collapsed' => TRUE,
-    '#attributes' => ['class' => ['chart-xaxis']],
+    '#collapsed'   => TRUE,
+    '#attributes'  => ['class' => ['chart-xaxis']],
   ];
-  $form['xaxis']['xaxis_title'] = [
-    '#title' => t('Custom title'),
-    '#type' => 'textfield',
+
+  $form['xaxis']['xaxis_title']     = [
+    '#title'         => t('Custom title'),
+    '#type'          => 'textfield',
     '#default_value' => $options['xaxis_title'],
-    '#parents' => array_merge($parents, ['xaxis_title']),
+    '#parents'       => array_merge($parents, ['xaxis_title']),
   ];
+
   $form['xaxis']['labels_rotation'] = [
-    '#title' => t('Labels rotation'),
-    '#type' => 'select',
-    '#options' => [
-      0 => t('0°'),
+    '#title'         => t('Labels rotation'),
+    '#type'          => 'select',
+    '#options'       => [
+      0  => t('0°'),
       30 => t('30°'),
       45 => t('45°'),
       60 => t('60°'),
       90 => t('90°'),
     ],
     // This is only shown on non-inverted charts.
-    '#attributes' => ['class' => ['axis-inverted-hide']],
+    '#attributes'    => ['class' => ['axis-inverted-hide']],
     '#default_value' => $options['xaxis_labels_rotation'],
-    '#parents' => array_merge($parents, ['xaxis_labels_rotation']),
+    '#parents'       => array_merge($parents, ['xaxis_labels_rotation']),
   ];
 
-  $form['yaxis'] = [
-    '#title' => t('Vertical axis'),
-    '#type' => 'fieldset',
+  $form['yaxis']                    = [
+    '#title'       => t('Vertical axis'),
+    '#type'        => 'fieldset',
     '#collapsible' => TRUE,
-    '#collapsed' => TRUE,
-    '#attributes' => ['class' => ['chart-yaxis']],
+    '#collapsed'   => TRUE,
+    '#attributes'  => ['class' => ['chart-yaxis']],
   ];
-  $form['yaxis']['title'] = [
-    '#title' => t('Custom title'),
-    '#type' => 'textfield',
+  $form['yaxis']['title']           = [
+    '#title'         => t('Custom title'),
+    '#type'          => 'textfield',
     '#default_value' => $options['yaxis_title'],
-    '#parents' => array_merge($parents, ['yaxis_title']),
+    '#parents'       => array_merge($parents, ['yaxis_title']),
   ];
-  $form['yaxis']['minmax'] = [
-    '#title' => t('Value range'),
+  $form['yaxis']['minmax']          = [
+    '#title'          => t('Value range'),
     '#theme_wrappers' => ['form_element'],
   ];
-  $form['yaxis']['minmax']['min'] = [
-    '#type' => 'textfield',
-    '#attributes' => [
-      'TYPE' => 'number',
-      'max' => 999999,
+  $form['yaxis']['minmax']['min']   = [
+    '#type'           => 'textfield',
+    '#attributes'     => [
+      'TYPE'        => 'number',
+      'max'         => 999999,
       'placeholder' => t('Minimum'),
     ],
-    '#default_value' => $options['yaxis_min'],
-    '#size' => 12,
-    '#parents' => array_merge($parents, ['yaxis_min']),
-    '#suffix' => ' ',
+    '#default_value'  => $options['yaxis_min'],
+    '#size'           => 12,
+    '#parents'        => array_merge($parents, ['yaxis_min']),
+    '#suffix'         => ' ',
     '#theme_wrappers' => [],
   ];
-  $form['yaxis']['minmax']['max'] = [
-    '#type' => 'textfield',
-    '#attributes' => [
-      'TYPE' => 'number',
-      'max' => 999999,
+  $form['yaxis']['minmax']['max']   = [
+    '#type'           => 'textfield',
+    '#attributes'     => [
+      'TYPE'        => 'number',
+      'max'         => 999999,
       'placeholder' => t('Maximum'),
     ],
-    '#default_value' => $options['yaxis_max'],
-    '#size' => 12,
-    '#parents' => array_merge($parents, ['yaxis_max']),
+    '#default_value'  => $options['yaxis_max'],
+    '#size'           => 12,
+    '#parents'        => array_merge($parents, ['yaxis_max']),
     '#theme_wrappers' => [],
   ];
-  $form['yaxis']['prefix'] = [
-    '#title' => t('Value prefix'),
-    '#type' => 'textfield',
+
+  $form['yaxis']['prefix']          = [
+    '#title'         => t('Value prefix'),
+    '#type'          => 'textfield',
     '#default_value' => $options['yaxis_prefix'],
-    '#size' => 12,
-    '#parents' => array_merge($parents, ['yaxis_prefix']),
+    '#size'          => 12,
+    '#parents'       => array_merge($parents, ['yaxis_prefix']),
   ];
-  $form['yaxis']['suffix'] = [
-    '#title' => t('Value suffix'),
-    '#type' => 'textfield',
+
+  $form['yaxis']['suffix']          = [
+    '#title'         => t('Value suffix'),
+    '#type'          => 'textfield',
     '#default_value' => $options['yaxis_suffix'],
-    '#size' => 12,
-    '#parents' => array_merge($parents, ['yaxis_suffix']),
-  ];
-  $form['yaxis']['decimal_count'] = [
-    '#title' => t('Decimal count'),
-    '#type' => 'textfield',
-    '#attributes' => [
-      'TYPE' => 'number',
-      'step' => 1,
-      'min' => 0,
-      'max' => 20,
+    '#size'          => 12,
+    '#parents'       => array_merge($parents, ['yaxis_suffix']),
+  ];
+
+  $form['yaxis']['decimal_count']   = [
+    '#title'         => t('Decimal count'),
+    '#type'          => 'textfield',
+    '#attributes'    => [
+      'TYPE'        => 'number',
+      'step'        => 1,
+      'min'         => 0,
+      'max'         => 20,
       'placeholder' => t('auto'),
     ],
     '#default_value' => $options['yaxis_decimal_count'],
-    '#size' => 5,
-    '#description' => t('Enforce a certain number of decimal-place digits in displayed values.'),
-    '#parents' => array_merge($parents, ['yaxis_decimal_count']),
+    '#size'          => 5,
+    '#description'   => t('Enforce a certain number of decimal-place digits in displayed values.'),
+    '#parents'       => array_merge($parents, ['yaxis_decimal_count']),
   ];
+
   $form['yaxis']['labels_rotation'] = [
-    '#title' => t('Labels rotation'),
-    '#type' => 'select',
-    '#options' => [
-      0 => t('0°'),
+    '#title'         => t('Labels rotation'),
+    '#type'          => 'select',
+    '#options'       => [
+      0  => t('0°'),
       30 => t('30°'),
       45 => t('45°'),
       60 => t('60°'),
       90 => t('90°'),
     ],
     // This is only shown on inverted charts.
-    '#attributes' => ['class' => ['axis-inverted-show']],
+    '#attributes'    => ['class' => ['axis-inverted-show']],
     '#default_value' => $options['yaxis_labels_rotation'],
-    '#parents' => array_merge($parents, ['yaxis_labels_rotation']),
+    '#parents'       => array_merge($parents, ['yaxis_labels_rotation']),
   ];
 
   return $form;
@@ -567,23 +597,23 @@ function charts_settings_form($form, $defaults = [], $field_options = [], $paren
 /**
  * Menu callback; Configure the site-wide defaults for charts.
  *
- * @param $form
- * @param $form_state
- * Standard parameters for a form.
+ * @param array $form
+ *   Form.
+ * @param array $form_state
+ *   Form State, Standard parameters for a form.
  *
  * @return mixed
- *
+ *   Form.
  */
 function charts_default_settings_form($form, $form_state) {
-  $defaults = \Drupal::state()
-    ->get('charts_default_settings', []);
+  $defaults = \Drupal::state()->get('charts_default_settings', []);
   $defaults += charts_default_settings();
   $field_options = [];
   $parents = ['charts_default_settings'];
 
   // Add help.
   $form['help'] = [
-    '#type' => 'markup',
+    '#type'   => 'markup',
     '#markup' => '<p>' . t('The settings on this page are used to set <strong>default</strong> settings. They do not affect existing charts. To make a new chart, <a href="!views">create a new view</a> and select the display format of "Chart".', ['!views' => url('admin/structure/views/add')]) . '</p>',
     '#weight' => -100,
   ];
@@ -606,7 +636,7 @@ function charts_default_settings_form($form, $form_state) {
   // Add submit buttons and normal saving behavior.
   $form['actions']['#type'] = 'actions';
   $form['actions']['submit'] = [
-    '#type' => 'submit',
+    '#type'  => 'submit',
     '#value' => t('Save defaults'),
   ];
 
@@ -615,16 +645,22 @@ function charts_default_settings_form($form, $form_state) {
 
 /**
  * Submit handler for charts_default_settings_form().
- * @param $form
- * @param $form_state
+ *
+ * @param array $form
+ *   Form.
+ * @param array $form_state
+ *   Form State.
  */
 function charts_default_settings_form_submit($form, $form_state) {
   \Drupal::state()
-    ->set('charts_default_settings', $form_state['values']['charts_default_settings']);
+      ->set('charts_default_settings', $form_state['values']['charts_default_settings']);
 }
 
 /**
  * Provides default options used by charts_settings_form().
+ *
+ * @return array
+ *   Default settings.
  */
 function charts_default_settings() {
   $defaults = [
diff --git a/modules/charts_c3/charts_c3.module b/modules/charts_c3/charts_c3.module
index 45469508b0c10089adec04073cf6e3cbd21de5ac..f72fa7c355956f43de04a8afa809066506cc992f 100644
--- a/modules/charts_c3/charts_c3.module
+++ b/modules/charts_c3/charts_c3.module
@@ -11,11 +11,21 @@ use Drupal\charts\Theme\ChartsInterface;
  * Implements hook_charts_info().
  */
 function charts_c3_charts_info() {
-  $info['c3'] = [
-    'label' => t('C3 Charts'),
-    'types' => ['area', 'bar', 'column', 'donut', 'line', 'pie', 'donut', 'scatter'],
+  return [
+    'c3' => [
+      'label' => t('C3 Charts'),
+      'types' => [
+        'area',
+        'bar',
+        'column',
+        'donut',
+        'line',
+        'pie',
+        'donut',
+        'scatter'
+      ],
+    ],
   ];
-  return $info;
 }
 
 /**
@@ -23,8 +33,8 @@ function charts_c3_charts_info() {
 */
 function charts_c3_charts_type_info() {
   $chart_types['donut'] = [
-      'label' => t('Donut'),
-      'axis' => ChartsInterface::CHARTS_SINGLE_AXIS,
-    ];
+    'label' => t('Donut'),
+    'axis'  => ChartsInterface::CHARTS_SINGLE_AXIS,
+  ];
   return $chart_types;
 }
diff --git a/modules/charts_c3/src/Charts/C3ChartsRender.php b/modules/charts_c3/src/Charts/C3ChartsRender.php
index 7bf275cdd9209f8d63243aedf0476bda017f98b7..4d08dd6233fb94324f42f322cde42931896f1640 100644
--- a/modules/charts_c3/src/Charts/C3ChartsRender.php
+++ b/modules/charts_c3/src/Charts/C3ChartsRender.php
@@ -61,15 +61,19 @@ class C3ChartsRender implements ChartsRenderInterface {
     }
 
     // Sets the primary y axis.
+/*    
     $yAxis = [];
     $yAxis[$seriesData[0]['name']] = 'y';
+*/
     $showAxis['show'] = TRUE;
     $showAxis['label'] = $options['yaxis_title'];
     $chartAxis->y = $showAxis;
 
     // Sets secondary axis from the first attachment only.
     if (!$noAttachmentDisplays && $attachmentDisplayOptions[0]['inherit_yaxis'] == 0) {
+/*
       $yAxis[$seriesData[1]['name']] = 'y2';
+*/
       $showSecAxis['show'] = TRUE;
       $showSecAxis['label'] = $attachmentDisplayOptions[0]['style']['options']['yaxis_title'];
       $chartAxis->y2 = $showSecAxis;
diff --git a/modules/charts_c3/src/Plugin/chart/CThreeCharts.php b/modules/charts_c3/src/Plugin/chart/CThreeCharts.php
index b4bf849e9eed06c8437803e81f95e069b49faf48..db351ca0a7b14aac694e9eeac131957f5ed679ef 100644
--- a/modules/charts_c3/src/Plugin/chart/CThreeCharts.php
+++ b/modules/charts_c3/src/Plugin/chart/CThreeCharts.php
@@ -20,6 +20,22 @@ use Drupal\charts_c3\Settings\CThree\ChartAxis;
  */
 class CThreeCharts extends AbstractChart {
 
+  /**
+   * Creates a JSON Object formatted for Google charts to use.
+   *
+   * @param mixed $options
+   *   Options.
+   * @param mixed $categories
+   *   Categories.
+   * @param mixed $seriesData
+   *   Series data.
+   * @param mixed $attachmentDisplayOptions
+   *   Attachment display options.
+   * @param mixed $variables
+   *   Variables.
+   * @param mixed $chartId
+   *   Chart Id.
+   */
   public function buildVariables($options, $categories = [], $seriesData = [], $attachmentDisplayOptions = [], &$variables, $chartId) {
     $noAttachmentDisplays = count($attachmentDisplayOptions) === 0;
     $types = [];
@@ -55,15 +71,19 @@ class CThreeCharts extends AbstractChart {
     }
 
     // Sets the primary y axis.
+/*  
     $yAxis = [];
     $yAxis[$seriesData[0]['name']] = 'y';
+*/
     $showAxis['show'] = TRUE;
     $showAxis['label'] = $options['yaxis_title'];
     $chartAxis->y = $showAxis;
 
     // Sets secondary axis from the first attachment only.
     if (!$noAttachmentDisplays && $attachmentDisplayOptions[0]['inherit_yaxis'] == 0) {
-      $yAxis[$seriesData[1]['name']] = 'y2';
+/*      
+      $yAxis[$seriesData[1]['name']] = 'y2'; 
+*/
       $showSecAxis['show'] = TRUE;
       $showSecAxis['label'] = $attachmentDisplayOptions[0]['style']['options']['yaxis_title'];
       $chartAxis->y2 = $showSecAxis;
@@ -78,14 +98,14 @@ class CThreeCharts extends AbstractChart {
       array_push($c3Data, $categories);
       $chartData->setColumns($c3Data);
     }
-    else if ($options['type'] == 'column') {
+    elseif ($options['type'] == 'column') {
       $chartData->setType('bar');
       $chartAxis->setRotated(FALSE);
       array_unshift($categories, 'x');
       array_push($c3Data, $categories);
       $chartData->setColumns($c3Data);
     }
-    else if ($options['type'] == 'pie' || $options['type'] == 'donut') {
+    elseif ($options['type'] == 'pie' || $options['type'] == 'donut') {
       $chartData->setColumns($c3Data);
     }
     else {
diff --git a/modules/charts_c3/src/Settings/CThree/ChartData.php b/modules/charts_c3/src/Settings/CThree/ChartData.php
index 8c0d4b968e50ae5b001b7e9110e221e1962d25a6..8768a57637fb204b09fc424570741bf36926c576 100644
--- a/modules/charts_c3/src/Settings/CThree/ChartData.php
+++ b/modules/charts_c3/src/Settings/CThree/ChartData.php
@@ -25,7 +25,7 @@ class ChartData implements \JsonSerializable {
   /**
    * Set X.
    *
-   * @param array $x
+   * @param mixed $x
    *   X.
    */
   public function setX($x) {
@@ -45,7 +45,7 @@ class ChartData implements \JsonSerializable {
   /**
    * Set Columns.
    *
-   * @param array $columns
+   * @param mixed $columns
    *   Columns.
    */
   public function setColumns($columns) {
diff --git a/modules/charts_c3/src/Settings/CThree/ChartType.php b/modules/charts_c3/src/Settings/CThree/ChartType.php
index 75321513c6d2d5eb8a5247cc5fcd6f554d9b8897..0b348a105536fc9f847d71bce25406ae55101e9a 100644
--- a/modules/charts_c3/src/Settings/CThree/ChartType.php
+++ b/modules/charts_c3/src/Settings/CThree/ChartType.php
@@ -33,6 +33,7 @@ class ChartType implements \JsonSerializable {
    * Json Serialize.
    *
    * @return array
+   *   Json Serialize.
    */
   public function jsonSerialize() {
     $vars = get_object_vars($this);
diff --git a/modules/charts_google/js/charts_google.js b/modules/charts_google/js/charts_google.js
index d72285bbe072df5e916fd37b1c64646b8d6b1f7a..db39601bd1fc0a78022654871abdfff9a2df3a29 100644
--- a/modules/charts_google/js/charts_google.js
+++ b/modules/charts_google/js/charts_google.js
@@ -36,7 +36,7 @@
   /**
    * Helper function to draw Google Charts.
    * 
-   * @param {boolean} reload Reload.
+   * @param {boolean} reload - Reload.
    */
   Drupal.googleCharts.drawCharts = function (reload) {
     $('.charts-google').each(function () {
@@ -66,11 +66,13 @@
 
   /**
    * Helper function to draw a Google Chart.
-   * 
+   *
    * @param {string} chartId - Chart Id.
    * @param {string} chartType - Chart Type.
    * @param {string} dataTable - Data.
    * @param {string} googleChartOptions - Options.
+   *
+   * @return {function} Draw Chart.
    */
   Drupal.googleCharts.drawChart = function (chartId, chartType, dataTable, googleChartOptions) {
     return function () {
diff --git a/modules/charts_google/src/Charts/GoogleChartsRender.php b/modules/charts_google/src/Charts/GoogleChartsRender.php
index b83794a74390b563fffea3b4aaca00de8c11baa5..7e1022296486900a9fbd9ee6c2705248f84abfbd 100644
--- a/modules/charts_google/src/Charts/GoogleChartsRender.php
+++ b/modules/charts_google/src/Charts/GoogleChartsRender.php
@@ -7,8 +7,7 @@ use Drupal\charts\Util\Util;
 use Drupal\charts_google\Settings\Google\GoogleOptions;
 use Drupal\charts_google\Settings\Google\ChartType;
 use Drupal\charts_google\Settings\Google\ChartArea;
-use Drupal\charts_google\Settings\Google\HorizontalAxis;
-use Drupal\charts_google\Settings\Google\VerticalAxis;
+use Drupal\charts_google\Settings\Google\ChartAxes;
 
 /**
  * Google Charts Render.
@@ -47,7 +46,7 @@ class GoogleChartsRender implements ChartsRenderInterface {
       array_unshift($rowDataTable, $categories[$j]);
       array_push($dataTable, $rowDataTable);
     }
-    
+
     $dataTableHeader = [];
     for ($r = 0; $r < $seriesCount; $r++) {
       array_push($dataTableHeader, $seriesData[$r]['name']);
@@ -68,7 +67,7 @@ class GoogleChartsRender implements ChartsRenderInterface {
 
   /**
    * Create charts options.
-   * 
+   *
    * @param array $options
    *   Options.
    * @param array $seriesData
@@ -77,7 +76,8 @@ class GoogleChartsRender implements ChartsRenderInterface {
    *   Attachment Display Options.
    *
    * @return \Drupal\charts_google\Settings\Google\GoogleOptions
-   *   GoogleOptions object with chart options or settings to be used by google visualization framework.
+   *   GoogleOptions object with chart options or settings to be used by google
+   *   visualization framework.
    */
   private function createChartsOptions(array $options = [], array $seriesData = [], array $attachmentDisplayOptions = []) {
     $noAttachmentDisplays = count($attachmentDisplayOptions) === 0;
@@ -85,7 +85,7 @@ class GoogleChartsRender implements ChartsRenderInterface {
     $chartSelected = [];
     $seriesTypes = [];
 
-    $firstVaxis = new VerticalAxis();
+    $firstVaxis = new ChartAxes();
 
     if (isset($options['yaxis_min'])) {
       $firstVaxis->setMinValue($options['yaxis_min']);
@@ -154,7 +154,7 @@ class GoogleChartsRender implements ChartsRenderInterface {
       $firstVaxis->setViewWindowMode($options['yaxis_view_window_mode']);
     }
 
-    $firstHaxis = new HorizontalAxis();
+    $firstHaxis = new ChartAxes();
 
     if (isset($options['xaxis_min'])) {
       $firstHaxis->setMinValue($options['xaxis_min']);
@@ -231,7 +231,7 @@ class GoogleChartsRender implements ChartsRenderInterface {
 
     // Sets secondary axis from the first attachment only.
     if (!$noAttachmentDisplays && $attachmentDisplayOptions[0]['inherit_yaxis'] == 0) {
-      $secondVaxis = new VerticalAxis();
+      $secondVaxis = new ChartAxes();
       $secondVaxis->setTitle($attachmentDisplayOptions[0]['style']['options']['yaxis_title']);
       array_push($vAxes, $secondVaxis);
     }
@@ -249,7 +249,7 @@ class GoogleChartsRender implements ChartsRenderInterface {
       if ($attachmentDisplayOptions[$i]['inherit_yaxis'] == 0 && $i == 0) {
         $seriesTypes[$i + 1] = [
           'type'            => $attachmentChartType,
-          'targetAxisIndex' => 1
+          'targetAxisIndex' => 1,
         ];
       }
       else {
@@ -326,17 +326,18 @@ class GoogleChartsRender implements ChartsRenderInterface {
     }
 
     // 'legend' can be a string (for position) or an array with legend
-    // properties: [position: 'top', textStyle: [color: 'blue', fontSize: 16]]
+    // properties: [position: 'top', textStyle: [color: 'blue', fontSize: 16]].
     if (isset($options['legend'])) {
       $googleOptions->setLegend($options['legend']);
     }
 
     // Set legend position.
     if (isset($options['legend_position'])) {
-      if(empty($options['legend_position'])) {
+      if (empty($options['legend_position'])) {
         $options['legend_position'] = 'none';
         $googleOptions->setLegend($options['legend_position']);
-      } else {
+      }
+      else {
         $googleOptions->setLegend($options['legend_position']);
       }
     }
@@ -346,7 +347,7 @@ class GoogleChartsRender implements ChartsRenderInterface {
       $googleOptions->setTitlePosition($options['title_position']);
     }
 
-    // Where to place the axis titles, compared to the chart area
+    // Where to place the axis titles, compared to the chart area.
     if (isset($options['axis_titles_position'])) {
       $googleOptions->setAxisTitlesPosition($options['axis_titles_position']);
     }
diff --git a/modules/charts_google/src/Plugin/chart/GoogleCharts.php b/modules/charts_google/src/Plugin/chart/GoogleCharts.php
index d6f0d86c19b175d6158262d10e14292b9675e068..67d42cba708438127645b05ac281da2d7379dc2d 100644
--- a/modules/charts_google/src/Plugin/chart/GoogleCharts.php
+++ b/modules/charts_google/src/Plugin/chart/GoogleCharts.php
@@ -6,8 +6,7 @@ use Drupal\charts\Plugin\chart\AbstractChart;
 use Drupal\charts_google\Settings\Google\GoogleOptions;
 use Drupal\charts_google\Settings\Google\ChartType;
 use Drupal\charts_google\Settings\Google\ChartArea;
-use Drupal\charts_google\Settings\Google\HorizontalAxis;
-use Drupal\charts_google\Settings\Google\VerticalAxis;
+use Drupal\charts_google\Settings\Google\ChartAxes;
 
 /**
  * Define a concrete class for a Chart.
@@ -30,7 +29,7 @@ class GoogleCharts extends AbstractChart {
    *   Series data.
    * @param mixed $attachmentDisplayOptions
    *   Attachment display options.
-   * @param mixed &$variables
+   * @param mixed $variables
    *   Variables.
    * @param mixed $chartId
    *   Chart Id.
@@ -95,7 +94,7 @@ class GoogleCharts extends AbstractChart {
     $chartSelected = [];
     $seriesTypes   = [];
 
-    $firstVaxis = new VerticalAxis();
+    $firstVaxis = new ChartAxes();
 
     if (isset($options['yaxis_min'])) {
       $firstVaxis->setMinValue($options['yaxis_min']);
@@ -164,7 +163,7 @@ class GoogleCharts extends AbstractChart {
       $firstVaxis->setViewWindowMode($options['yaxis_view_window_mode']);
     }
 
-    $firstHaxis = new HorizontalAxis();
+    $firstHaxis = new ChartAxes();
 
     if (isset($options['xaxis_min'])) {
       $firstHaxis->setMinValue($options['xaxis_min']);
@@ -241,7 +240,7 @@ class GoogleCharts extends AbstractChart {
 
     // Sets secondary axis from the first attachment only.
     if (!$noAttachmentDisplays && $attachmentDisplayOptions[0]['inherit_yaxis'] == 0) {
-      $secondVaxis = new VerticalAxis();
+      $secondVaxis = new ChartAxes();
       $secondVaxis->setTitle($attachmentDisplayOptions[0]['style']['options']['yaxis_title']);
       array_push($vAxes, $secondVaxis);
     }
@@ -259,7 +258,7 @@ class GoogleCharts extends AbstractChart {
       if ($attachmentDisplayOptions[$i]['inherit_yaxis'] == 0 && $i == 0) {
         $seriesTypes[$i + 1] = [
           'type'            => $attachmentChartType,
-          'targetAxisIndex' => 1
+          'targetAxisIndex' => 1,
         ];
       }
       else {
@@ -336,7 +335,7 @@ class GoogleCharts extends AbstractChart {
     }
 
     // 'legend' can be a string (for position) or an array with legend
-    // properties: [position: 'top', textStyle: [color: 'blue', fontSize: 16]]
+    // properties: [position: 'top', textStyle: [color: 'blue', fontSize: 16]].
     if (isset($options['legend'])) {
       $googleOptions->setLegend($options['legend']);
     }
@@ -357,7 +356,7 @@ class GoogleCharts extends AbstractChart {
       $googleOptions->setTitlePosition($options['title_position']);
     }
 
-    // Where to place the axis titles, compared to the chart area
+    // Where to place the axis titles, compared to the chart area.
     if (isset($options['axis_titles_position'])) {
       $googleOptions->setAxisTitlesPosition($options['axis_titles_position']);
     }
diff --git a/modules/charts_google/src/Settings/Google/ChartArea.php b/modules/charts_google/src/Settings/Google/ChartArea.php
index 5461af3cf0dc9987e2b297d9f1e78e4c3ce7163f..3d4a930817cceb4cd1fb41907851d0b784bfc77f 100644
--- a/modules/charts_google/src/Settings/Google/ChartArea.php
+++ b/modules/charts_google/src/Settings/Google/ChartArea.php
@@ -11,21 +11,29 @@ class ChartArea implements \JsonSerializable {
 
   /**
    * Chart area width.
+   *
+   * @var mixed
    */
   private $width;
 
   /**
    * Chart area height.
+   *
+   * @var mixed
    */
   private $height;
 
   /**
    * How far to draw the chart from the top border.
+   *
+   * @var mixed
    */
   private $top;
 
   /**
    * How far to draw the chart from the left border.
+   *
+   * @var mixed
    */
   private $left;
 
@@ -33,6 +41,7 @@ class ChartArea implements \JsonSerializable {
    * Gets the chart area width.
    *
    * @return mixed
+   *   Width.
    */
   public function getWidth() {
     return $this->width;
@@ -42,6 +51,7 @@ class ChartArea implements \JsonSerializable {
    * Sets the chart area width.
    *
    * @param mixed $width
+   *   Width.
    */
   public function setWidth($width) {
     $this->width = $width;
@@ -51,6 +61,7 @@ class ChartArea implements \JsonSerializable {
    * Gets the chart area height.
    *
    * @return mixed
+   *   Height.
    */
   public function getHeight() {
     return $this->height;
@@ -60,6 +71,7 @@ class ChartArea implements \JsonSerializable {
    * Sets the chart area height.
    *
    * @param mixed $height
+   *   Height.
    */
   public function setHeight($height) {
     $this->height = $height;
@@ -69,6 +81,7 @@ class ChartArea implements \JsonSerializable {
    * Gets how far to draw the chart from the top border.
    *
    * @return mixed
+   *   Padding Top.
    */
   public function getPaddingTop() {
     return $this->top;
@@ -78,6 +91,7 @@ class ChartArea implements \JsonSerializable {
    * Sets how far to draw the chart from the top border.
    *
    * @param mixed $top
+   *   Padding Top.
    */
   public function setPaddingTop($top) {
     $this->top = $top;
@@ -87,6 +101,7 @@ class ChartArea implements \JsonSerializable {
    * Gets how far to draw the chart from the left border.
    *
    * @return mixed
+   *   Padding Left.
    */
   public function getPaddingLeft() {
     return $this->left;
@@ -96,13 +111,17 @@ class ChartArea implements \JsonSerializable {
    * Sets how far to draw the chart from the left border.
    *
    * @param mixed $left
+   *   Padding Left.
    */
   public function setPaddingLeft($left) {
     $this->left = $left;
   }
 
   /**
+   * Json Serialize.
+   *
    * @return array
+   *   Json Serialize.
    */
   public function jsonSerialize() {
     $vars = get_object_vars($this);
diff --git a/modules/charts_google/src/Settings/Google/ChartAxis.php b/modules/charts_google/src/Settings/Google/ChartAxes.php
similarity index 85%
rename from modules/charts_google/src/Settings/Google/ChartAxis.php
rename to modules/charts_google/src/Settings/Google/ChartAxes.php
index 27afcbf4b146375a37b7ff3737b650312990bf62..d2a6f0607006ed8d0f44e5a2d175616a44cb5634 100644
--- a/modules/charts_google/src/Settings/Google/ChartAxis.php
+++ b/modules/charts_google/src/Settings/Google/ChartAxes.php
@@ -3,82 +3,120 @@
 namespace Drupal\charts_google\Settings\Google;
 
 /**
- * Class ChartAxis.
+ * Class ChartAxes.
  *
  * @package Drupal\charts_google\Settings\Google
  *
  *  Chart Axis options are described here:
  * @see https://developers.google.com/chart/interactive/docs/gallery/columnchart#configuration-options
  */
-class ChartAxis implements \JsonSerializable {
+class ChartAxes implements \JsonSerializable {
 
   /**
    * Chart Axis property that specifies a title for the axis.
+   *
+   * @var mixed
    */
   private $title;
 
   /**
    * An array that specifies the axis title text style.
+   *
+   * @var mixed
    */
   private $titleTextStyle;
 
   /**
+   * Baseline.
+   *
    * Chart Axis property that specifies the baseline for the axis. If the
    * baseline is larger than the highest grid line or smaller than the lowest
    * grid line, it will be rounded to the closest gridline.
+   *
+   * @var mixed
    */
   private $baseline;
 
   /**
+   * Baseline Color.
+   *
    * Specifies the color of the baseline for the axis. Can be any HTML
    * color string, for example: 'red' or '#00cc00'.
+   *
+   * @var mixed
    */
   private $baselineColor;
 
   /**
+   * Direction.
+   *
    * The direction in which the values along the axis grow. Specify -1
    * to reverse the order of the values.
+   *
+   * @var mixed
    */
   private $direction;
 
   /**
    * A format string for numeric axis labels.
+   *
+   * @var mixed
    */
   private $format;
 
   /**
+   * Text Position.
+   *
    * Position of the axis text, relative to the chart area.
    * Supported values: 'out', 'in', 'none'.
+   *
+   * @var mixed
    */
   private $textPosition;
 
   /**
    * An array that specifies the axis text style.
+   *
+   * @var mixed
    */
   private $textStyle;
 
   /**
+   * Max Value.
+   *
    * Moves the max value of the axis to the specified value; this will
    * be upward in most charts. Ignored if this is set to a value smaller than
    * the maximum y-value of the data.
+   *
+   * @var mixed
    */
   private $maxValue;
 
   /**
+   * Min Value.
+   *
    * Moves the min value of the axis to the specified value; this will
    * be downward in most charts. Ignored if this is set to a value greater than
    * the minimum y-value of the data.
+   *
+   * @var mixed
    */
   private $minValue = 0;
 
   /**
+   * View Window Mode.
+   *
    * Specifies how to scale the axis to render the values within the
    * chart area.
+   *
+   * @var mixed
    */
   private $viewWindowMode;
 
   /**
    * Specifies the cropping range of the axis.
+   *
+   * @var mixed
    */
   private $viewWindow;
 
@@ -86,6 +124,7 @@ class ChartAxis implements \JsonSerializable {
    * Get Chart Axis property that specifies a title for the axis.
    *
    * @return mixed
+   *   Title.
    */
   public function getTitle() {
     return $this->title;
@@ -95,6 +134,7 @@ class ChartAxis implements \JsonSerializable {
    * Set Chart Axis property that specifies a title for the axis.
    *
    * @param $value
+   *   Title.
    */
   public function setTitle($value) {
     $this->title = $value;
@@ -104,6 +144,7 @@ class ChartAxis implements \JsonSerializable {
    * Get an array that specifies the axis title text style.
    *
    * @return mixed
+   *   Title Text Style.
    */
   public function getTitleTextStyle() {
     return $this->titleTextStyle;
@@ -113,6 +154,7 @@ class ChartAxis implements \JsonSerializable {
    * Set an array that specifies the axis title text style.
    *
    * @param mixed $value
+   *   Title Text Style.
    */
   public function setTitleTextStyle($value) {
     $this->titleTextStyle = $value;
@@ -125,6 +167,7 @@ class ChartAxis implements \JsonSerializable {
    *   Machine name of the text style property.
    *
    * @return mixed
+   *   Title Text Style Value.
    */
   public function getTitleTextStyleValue($key) {
     return isset($this->titleTextStyle[$key]) ? $this->titleTextStyle[$key] : NULL;
@@ -146,6 +189,7 @@ class ChartAxis implements \JsonSerializable {
    * Get Chart Axis property that specifies the baseline for the axis.
    *
    * @return mixed
+   *   Baseline.
    */
   public function getBaseline() {
     return $this->baseline;
@@ -155,6 +199,7 @@ class ChartAxis implements \JsonSerializable {
    * Set Chart Axis property that specifies the baseline for the axis.
    *
    * @param mixed $value
+   *   Baseline.
    */
   public function setBaseline($value) {
     $this->baseline = $value;
@@ -164,6 +209,7 @@ class ChartAxis implements \JsonSerializable {
    * Get the color of the baseline for the axis.
    *
    * @return mixed
+   *   Baseline Color.
    */
   public function getBaselineColor() {
     return $this->baselineColor;
@@ -173,6 +219,7 @@ class ChartAxis implements \JsonSerializable {
    * Set the color of the baseline for the axis.
    *
    * @param mixed $value
+   *   Baseline Color.
    */
   public function setBaselineColor($value) {
     $this->baselineColor = $value;
@@ -182,6 +229,7 @@ class ChartAxis implements \JsonSerializable {
    * Get the direction in which the values along the axis grow.
    *
    * @return mixed
+   *   Direction.
    */
   public function getDirection() {
     return $this->direction;
@@ -191,24 +239,27 @@ class ChartAxis implements \JsonSerializable {
    * Set the direction in which the values along the axis grow.
    *
    * @param mixed $value
+   *   Direction.
    */
   public function setDirection($value) {
     $this->direction = $value;
   }
 
   /**
-   * Get the format string for numeric axis labels
+   * Get the format string for numeric axis labels.
    *
    * @return mixed
+   *   Format.
    */
   public function getFormat() {
     return $this->format;
   }
 
   /**
-   * Set a format string for numeric axis labels
+   * Set a format string for numeric axis labels.
    *
    * @param mixed $value
+   *   Format.
    */
   public function setFormat($value) {
     $this->format = $value;
@@ -218,6 +269,7 @@ class ChartAxis implements \JsonSerializable {
    * Get the position of the axis text, relative to the chart area.
    *
    * @return mixed
+   *   Text Position.
    */
   public function getTextPosition() {
     return $this->textPosition;
@@ -227,6 +279,7 @@ class ChartAxis implements \JsonSerializable {
    * Set the position of the axis text, relative to the chart area.
    *
    * @param mixed $value
+   *   Text Position.
    */
   public function setTextPosition($value) {
     $this->textPosition = $value;
@@ -236,6 +289,7 @@ class ChartAxis implements \JsonSerializable {
    * Get an array that specifies the axis text style.
    *
    * @return mixed
+   *   Text Style.
    */
   public function getTextStyle() {
     return $this->textStyle;
@@ -245,6 +299,7 @@ class ChartAxis implements \JsonSerializable {
    * Set an array that specifies the axis text style.
    *
    * @param mixed $value
+   *   Text Style.
    */
   public function setTextStyle($value) {
     $this->textStyle = $value;
@@ -257,6 +312,7 @@ class ChartAxis implements \JsonSerializable {
    *   Machine name of the text style property.
    *
    * @return mixed
+   *   Text Style Value.
    */
   public function getTextStyleValue($key) {
     return isset($this->textStyle[$key]) ? $this->textStyle[$key] : NULL;
@@ -278,6 +334,7 @@ class ChartAxis implements \JsonSerializable {
    * Get the max value of the axis.
    *
    * @return mixed
+   *   Max Value.
    */
   public function getMaxValue() {
     return $this->maxValue;
@@ -287,6 +344,7 @@ class ChartAxis implements \JsonSerializable {
    * Set the max value of the axis.
    *
    * @param mixed $value
+   *   Max Value.
    */
   public function setMaxValue($value) {
     $this->maxValue = $value;
@@ -296,6 +354,7 @@ class ChartAxis implements \JsonSerializable {
    * Get the min value of the axis.
    *
    * @return mixed
+   *   Min Value.
    */
   public function getMinValue() {
     return $this->minValue;
@@ -305,26 +364,33 @@ class ChartAxis implements \JsonSerializable {
    * Set the min value of the axis.
    *
    * @param mixed $value
+   *   Min Value.
    */
   public function setMinValue($value) {
     $this->minValue = $value;
   }
 
   /**
+   * Get View Window Mode.
+   *
    * Get the value that specifies how to scale the axis to render the
    * values within the chart area.
    *
    * @return mixed
+   *   View Window Mode.
    */
   public function getViewWindowMode() {
     return $this->viewWindowMode;
   }
 
   /**
+   * Set View Window Mode.
+   *
    * Set the value that specifies how to scale the axis to render the
    * values within the chart area.
    *
    * @param mixed $value
+   *   View Window Mode.
    */
   public function setViewWindowMode($value) {
     $this->viewWindowMode = $value;
@@ -334,6 +400,7 @@ class ChartAxis implements \JsonSerializable {
    * Get an array that specifies the cropping range of the axis.
    *
    * @return mixed
+   *   View Window.
    */
   public function getViewWindow() {
     return $this->viewWindow;
@@ -343,12 +410,15 @@ class ChartAxis implements \JsonSerializable {
    * Set an array that specifies the cropping range of the axis.
    *
    * @param mixed $value
+   *   View Window.
    */
   public function setViewWindow($value) {
     $this->viewWindow = $value;
   }
 
   /**
+   * Get View Window Value.
+   *
    * Get an array property that specifies the the cropping range of the
    * axis.
    *
@@ -356,12 +426,15 @@ class ChartAxis implements \JsonSerializable {
    *   Property key.
    *
    * @return mixed
+   *   View Window Value.
    */
   public function getViewWindowValue($key) {
     return isset($this->viewWindow[$key]) ? $this->viewWindow[$key] : NULL;
   }
 
   /**
+   * Set View Window Value.
+   *
    * Set an array property that specifies the cropping range of the horizontal
    * axis.
    *
@@ -375,7 +448,10 @@ class ChartAxis implements \JsonSerializable {
   }
 
   /**
+   * Json Serialize.
+   *
    * @return array
+   *   Json Serialize.
    */
   public function jsonSerialize() {
     $vars = get_object_vars($this);
@@ -383,4 +459,3 @@ class ChartAxis implements \JsonSerializable {
   }
 
 }
-
diff --git a/modules/charts_google/src/Settings/Google/ChartType.php b/modules/charts_google/src/Settings/Google/ChartType.php
index 972b1430d07bfd86a11c2b9f4f7058dd69ceb606..7388fe2afe974e8ce568ec5fd81fb87f0083a377 100644
--- a/modules/charts_google/src/Settings/Google/ChartType.php
+++ b/modules/charts_google/src/Settings/Google/ChartType.php
@@ -2,18 +2,28 @@
 
 namespace Drupal\charts_google\Settings\Google;
 
+/**
+ * Chart Type.
+ */
 class ChartType implements \JsonSerializable {
+
   private $type;
 
   /**
+   * Get Chart Type.
+   *
    * @return mixed
+   *   Chart Type.
    */
   public function getChartType() {
     return $this->type;
   }
 
   /**
+   * Chart Type.
+   *
    * @param mixed $type
+   *   Chart Type.
    */
   public function setChartType($type) {
     $ucType = ucfirst($type);
@@ -21,7 +31,10 @@ class ChartType implements \JsonSerializable {
   }
 
   /**
+   * Json Serialize.
+   *
    * @return array
+   *   Json Serialize.
    */
   public function jsonSerialize() {
     $vars = get_object_vars($this);
diff --git a/modules/charts_google/src/Settings/Google/GoogleOptions.php b/modules/charts_google/src/Settings/Google/GoogleOptions.php
index 042b0351121dcbf322cd90e5498770fd1bde2b3a..ba63f1bee1752f470afe7d1a2eb1e050527e6b57 100644
--- a/modules/charts_google/src/Settings/Google/GoogleOptions.php
+++ b/modules/charts_google/src/Settings/Google/GoogleOptions.php
@@ -11,60 +11,92 @@ class GoogleOptions implements \JsonSerializable {
 
   /**
    * For Material Charts, this option specifies the title.
+   *
+   * @var mixed
    */
   private $title;
 
   /**
    * For Material Charts, this option specifies the subtitle.
+   *
+   * @var mixed
    */
   private $subTitle;
 
   /**
    * Where to place the chart title, compared to the chart area.
+   *
+   * @var mixed
    */
   private $titlePosition;
 
   /**
    * Where to place the axis titles, compared to the chart area.
+   *
+   * @var mixed
    */
   private $axisTitlesPosition;
 
   /**
+   * Chart Area.
+   *
    * An array with members to configure the placement and size of the chart
    * area.
+   *
+   * @var mixed
    */
   private $chartArea;
 
   /**
+   * Horizontal Axes.
+   *
    * Specifies properties for individual horizontal axes, if the chart has
    * multiple horizontal axes.
+   *
+   * @var mixed
    */
   private $hAxes;
 
   /**
+   * Vertical Axes.
+   *
    * An array with members to configure various vertical axis elements.
+   *
+   * @var mixed
    */
   private $vAxes;
 
   /**
+   * Colors.
+   *
    * The colors to use for the chart elements. An array of strings, where each
    * element is an HTML color string
+   *
+   * @var mixed
    */
   private $colors;
 
   /**
+   * Legend.
+   *
    * An array with members to configure various aspects of the legend. Or string
    * for the position of the legend.
+   *
+   * @var mixed
    */
   private $legend;
 
   /**
    * Width of the chart, in pixels.
+   *
+   * @var mixed
    */
   private $width;
 
   /**
    * Height of the chart, in pixels.
+   *
+   * @var mixed
    */
   private $height;
 
@@ -89,6 +121,8 @@ class GoogleOptions implements \JsonSerializable {
   }
 
   /**
+   * Get Subtitle.
+   *
    * Gets the subtitle of the Material Chart. Only Material Charts support
    * subtitle.
    *
@@ -100,10 +134,13 @@ class GoogleOptions implements \JsonSerializable {
   }
 
   /**
+   * Set Subtitle.
+   *
    * Sets the subtitle of the Material Chart. Only Material Charts support
    * subtitle.
    *
    * @param string $title
+   *   SubTitle.
    */
   public function setSubTitle($title) {
     $this->subTitle = $title;
@@ -113,6 +150,7 @@ class GoogleOptions implements \JsonSerializable {
    * Gets the position of chart title.
    *
    * @return string
+   *   Title Position.
    */
   public function getTitlePosition() {
     return $this->titlePosition;
@@ -127,6 +165,7 @@ class GoogleOptions implements \JsonSerializable {
    * - none: Omit the title.
    *
    * @param string $position
+   *   Title Position.
    */
   public function setTitlePosition($position) {
     $this->titlePosition = $position;
@@ -136,6 +175,7 @@ class GoogleOptions implements \JsonSerializable {
    * Gets the position of the axis titles.
    *
    * @return string
+   *   Axis Titles Position.
    */
   public function getAxisTitlesPosition() {
     return $this->axisTitlesPosition;
@@ -150,6 +190,7 @@ class GoogleOptions implements \JsonSerializable {
    * - none: Omit the axis titles.
    *
    * @param string $position
+   *   Position.
    */
   public function setAxisTitlesPosition($position) {
     $this->axisTitlesPosition = $position;
@@ -159,6 +200,7 @@ class GoogleOptions implements \JsonSerializable {
    * Gets the chartArea property.
    *
    * @return mixed
+   *   Chart Area.
    */
   public function getChartArea() {
     return $this->chartArea;
@@ -168,6 +210,7 @@ class GoogleOptions implements \JsonSerializable {
    * Sets the chartArea property.
    *
    * @param mixed $chartArea
+   *   Chart Area.
    */
   public function setChartArea($chartArea) {
     $this->chartArea = $chartArea;
@@ -177,6 +220,7 @@ class GoogleOptions implements \JsonSerializable {
    * Gets the horizontal axes.
    *
    * @return array
+   *   Horizontal Axes.
    */
   public function getHorizontalAxes() {
     return $this->hAxes;
@@ -213,6 +257,8 @@ class GoogleOptions implements \JsonSerializable {
   }
 
   /**
+   * Get Colors.
+   *
    * Gets the colors to use for the chart elements. An array of strings, where
    * each element is an HTML color string.
    *
@@ -224,6 +270,8 @@ class GoogleOptions implements \JsonSerializable {
   }
 
   /**
+   * Set Colors.
+   *
    * Sets the colors to use for the chart elements. An array of strings, where
    * each element is an HTML color string.
    *
@@ -238,6 +286,7 @@ class GoogleOptions implements \JsonSerializable {
    * Gets the Legend properties.
    *
    * @return mixed
+   *   Legend.
    */
   public function getLegend() {
     return $this->legend;
@@ -255,10 +304,11 @@ class GoogleOptions implements \JsonSerializable {
   /**
    * Gets a Legend property.
    *
-   * @param $key
+   * @param mixed $key
    *   Property key.
    *
    * @return mixed
+   *   Legend Property.
    */
   public function getLegendProperty($key) {
     return isset($this->legend[$key]) ? $this->legend[$key] : NULL;
@@ -267,9 +317,9 @@ class GoogleOptions implements \JsonSerializable {
   /**
    * Sets a Legend property.
    *
-   * @param $key
+   * @param mixed $key
    *   Property key.
-   * @param $value
+   * @param mixed $value
    *   Property value.
    */
   public function setLegendProperty($key, $value) {
@@ -280,6 +330,7 @@ class GoogleOptions implements \JsonSerializable {
    * Gets the width of the chart.
    *
    * @return mixed
+   *   Width.
    */
   public function getWidth() {
     return $this->width;
@@ -299,6 +350,7 @@ class GoogleOptions implements \JsonSerializable {
    * Gets the height of the chart.
    *
    * @return mixed
+   *   Height.
    */
   public function getHeight() {
     return $this->height;
@@ -315,8 +367,10 @@ class GoogleOptions implements \JsonSerializable {
   }
 
   /**
+   * Json Serialize.
+   *
    * @return array
-   *   Get an array.
+   *   Json Serialize.
    */
   public function jsonSerialize() {
     $vars = get_object_vars($this);
diff --git a/modules/charts_google/src/Settings/Google/HorizontalAxis.php b/modules/charts_google/src/Settings/Google/HorizontalAxis.php
deleted file mode 100644
index 429933f098154d8833f2074cd2b0705d868b7f48..0000000000000000000000000000000000000000
--- a/modules/charts_google/src/Settings/Google/HorizontalAxis.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-
-namespace Drupal\charts_google\Settings\Google;
-
-use Drupal\charts_google\Settings\Google\ChartAxis;
-
-/**
- * Class HorizontalAxis.
- *
- * @package Drupal\charts_google\Settings\Google
- *
- * hAxis options are described here:
- * @see https://developers.google.com/chart/interactive/docs/gallery/columnchart#configuration-options
- */
-class HorizontalAxis extends ChartAxis {
-
-}
diff --git a/modules/charts_google/src/Settings/Google/VerticalAxis.php b/modules/charts_google/src/Settings/Google/VerticalAxis.php
deleted file mode 100644
index 57bfffa495c2de69a5d1fd2b51c6af3e44d2d4ff..0000000000000000000000000000000000000000
--- a/modules/charts_google/src/Settings/Google/VerticalAxis.php
+++ /dev/null
@@ -1,17 +0,0 @@
-<?php
-
-namespace Drupal\charts_google\Settings\Google;
-
-use Drupal\charts_google\Settings\Google\ChartAxis;
-
-/**
- * Class VerticalAxis.
- *
- * @package Drupal\charts_google\Settings\Google
- *
- * vAxis options are described here:
- * @see https://developers.google.com/chart/interactive/docs/gallery/columnchart#configuration-options
- */
-class VerticalAxis extends ChartAxis {
-
-}
diff --git a/modules/charts_highcharts/charts_highcharts.install b/modules/charts_highcharts/charts_highcharts.install
index c5fce614a91b519bb6649fabe2b2c7f6e2865dce..c4ec3624e31b19391473d3ad43ca570bb663bd69 100644
--- a/modules/charts_highcharts/charts_highcharts.install
+++ b/modules/charts_highcharts/charts_highcharts.install
@@ -9,15 +9,15 @@
  * Implements hook_requirements().
  */
 function charts_highcharts_requirements($phase) {
-  $requirements = array();
+  $requirements = [];
   if (function_exists('libraries_detect') && $highcharts_info = libraries_detect('highcharts')) {
     if (is_dir($highcharts_info['library path'] . '/js/exporting-server')) {
-      $requirements['highcharts_security'] = array(
-        'title' => t('Highcharts vulnerability'),
-        'severity' => REQUIREMENT_ERROR,
-        'value' => t('Dangerous sample code present'),
-        'description' => t('Your installation of the Highcharts library at "@path" contains a directory named "exporting-server". This directory contains dangerous sample files that may compromise the security of your site. You must delete this directory before you may use the Charts Highcharts module.', array('@path' => $highcharts_info['library path'])),
-      );
+      $requirements['highcharts_security'] = [
+        'title'       => t('Highcharts vulnerability'),
+        'severity'    => REQUIREMENT_ERROR,
+        'value'       => t('Dangerous sample code present'),
+        'description' => t('Your installation of the Highcharts library at "@path" contains a directory named "exporting-server". This directory contains dangerous sample files that may compromise the security of your site. You must delete this directory before you may use the Charts Highcharts module.', ['@path' => $highcharts_info['library path']]),
+      ];
     }
   }
 
diff --git a/modules/charts_highcharts/charts_highcharts.module b/modules/charts_highcharts/charts_highcharts.module
index 73e5fe75c0da2883766b56d9d9fbf2eb0fc099d1..473f669a8e94dd7a2d1b23f420f23e89e0bb0e26 100644
--- a/modules/charts_highcharts/charts_highcharts.module
+++ b/modules/charts_highcharts/charts_highcharts.module
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * @file
  * Charts module integration with Highcharts library.
diff --git a/modules/charts_highcharts/src/Charts/HighchartsChartsRender.php b/modules/charts_highcharts/src/Charts/HighchartsChartsRender.php
index d28285a93d4ca97aa3ad2b3a2999b264a9e4caa6..4b768e61de4928b25afd8f1114930d18893fbba8 100644
--- a/modules/charts_highcharts/src/Charts/HighchartsChartsRender.php
+++ b/modules/charts_highcharts/src/Charts/HighchartsChartsRender.php
@@ -44,7 +44,7 @@ class HighchartsChartsRender implements ChartsRenderInterface {
     if ($typeOptions == 'donut') {
       $typeOptions = 'pie';
       // Remove donut from seriesData.
-      foreach ($seriesData as $key => &$value) {
+      foreach ($seriesData as &$value) {
         $value = str_replace('donut', 'pie', $value);
       }
       // Add innerSize to differentiate between donut and pie.
@@ -136,7 +136,7 @@ class HighchartsChartsRender implements ChartsRenderInterface {
     $highchart = new Highcharts();
     $highchart->setChart($chart);
     $highchart->setTitle($chartTitle);
-    $highchart->setXAxis($chartXaxis);
+    $highchart->setAxisX($chartXaxis);
     /* $highchart->yAxis = $yAxes; */
     $highchart->setTooltip($chartTooltip);
     $highchart->setPlotOptions($plotOptions);
diff --git a/modules/charts_highcharts/src/Plugin/chart/Highchart.php b/modules/charts_highcharts/src/Plugin/chart/Highchart.php
index 9922807835e1d4b04d4f757549695ba068097126..4b17ca63fb90bdeb4f1cd2402274c5d0190c9d50 100644
--- a/modules/charts_highcharts/src/Plugin/chart/Highchart.php
+++ b/modules/charts_highcharts/src/Plugin/chart/Highchart.php
@@ -32,15 +32,20 @@ use Drupal\charts_highcharts\Settings\Highcharts\Highcharts;
 class Highchart extends AbstractChart {
 
   /**
-   * Creates a JSON Object formatted for Highcharts to use
+   * Creates a JSON Object formatted for Google charts to use.
    *
-   * @param $options
-   * @param array $categories
-   * @param array $seriesData
-   *
-   * @param array $attachmentDisplayOptions
-   *
-   * @return Highcharts object to be used by highcharts javascripts visualization framework
+   * @param mixed $options
+   *   Options.
+   * @param mixed $categories
+   *   Categories.
+   * @param mixed $seriesData
+   *   Series data.
+   * @param mixed $attachmentDisplayOptions
+   *   Attachment display options.
+   * @param mixed $variables
+   *   Variables.
+   * @param mixed $chartId
+   *   Chart Id.
    */
   public function buildVariables($options, $categories = [], $seriesData = [], $attachmentDisplayOptions = [], &$variables, $chartId) {
     $noAttachmentDisplays = count($attachmentDisplayOptions) === 0;
@@ -51,7 +56,7 @@ class Highchart extends AbstractChart {
     if ($typeOptions == 'donut') {
       $typeOptions = 'pie';
       // Remove donut from seriesData.
-      foreach ($seriesData as $key => &$value) {
+      foreach ($seriesData as &$value) {
         $value = str_replace('donut', 'pie', $value);
       }
       // Add innerSize to differentiate between donut and pie.
@@ -80,7 +85,7 @@ class Highchart extends AbstractChart {
       $chartTitle->setText($options['title']);
     }
 
-    $chartXaxis  = new Xaxis();
+    $chartXaxis = new Xaxis();
     $chartLabels = new ChartLabel();
 
     // Set x-axis label rotation.
@@ -141,7 +146,7 @@ class Highchart extends AbstractChart {
     $highchart = new Highcharts();
     $highchart->setChart($chart);
     $highchart->setTitle($chartTitle);
-    $highchart->setXAxis($chartXaxis);
+    $highchart->setAxisX($chartXaxis);
     /* $highchart->yAxis = $yAxes; */
     $highchart->setTooltip($chartTooltip);
     $highchart->setPlotOptions($plotOptions);
diff --git a/modules/charts_highcharts/src/Settings/Highcharts/Chart.php b/modules/charts_highcharts/src/Settings/Highcharts/Chart.php
index 90725c9877461304b40794551ef2778ded4e3550..4a02b0e5dd64171dfc6625c7d1da3111d005287a 100644
--- a/modules/charts_highcharts/src/Settings/Highcharts/Chart.php
+++ b/modules/charts_highcharts/src/Settings/Highcharts/Chart.php
@@ -6,15 +6,16 @@ namespace Drupal\charts_highcharts\Settings\Highcharts;
  * Chart.
  */
 class Chart implements \JsonSerializable {
-  
+
   private $type;
   private $width = NULL;
   private $height = NULL;
-  
+
   /**
    * Get Type.
    *
    * @return string
+   *   Type.
    */
   public function getType() {
     return $this->type;
@@ -24,6 +25,7 @@ class Chart implements \JsonSerializable {
    * Set Type.
    *
    * @param string $type
+   *   Type.
    */
   public function setType($type = '') {
     $this->type = $type;
@@ -58,12 +60,12 @@ class Chart implements \JsonSerializable {
    * Get Height.
    *
    * @return int|null
-   *   Height. 
+   *   Height.
    */
   public function getHeight() {
     return $this->height;
   }
-  
+
   /**
    * Set Height.
    *
@@ -75,13 +77,13 @@ class Chart implements \JsonSerializable {
       $this->height = NULL;
     }
     else {
-      $this->height = (int)$height;
+      $this->height = (int) $height;
     }
   }
-  
+
   /**
    * Json Serialize.
-   * 
+   *
    * @return array
    *   Variables.
    */
diff --git a/modules/charts_highcharts/src/Settings/Highcharts/ChartCredits.php b/modules/charts_highcharts/src/Settings/Highcharts/ChartCredits.php
index bf179d8b2d98e9451ac4bac27621847746dcad11..59436a2f4cd1a1eaf3664c988e15293c756bf5b0 100644
--- a/modules/charts_highcharts/src/Settings/Highcharts/ChartCredits.php
+++ b/modules/charts_highcharts/src/Settings/Highcharts/ChartCredits.php
@@ -12,7 +12,7 @@ class ChartCredits implements \JsonSerializable {
   /**
    * Is Enabled.
    *
-   * @return boolean
+   * @return bool
    *   Enabled.
    */
   public function isEnabled() {
@@ -22,7 +22,7 @@ class ChartCredits implements \JsonSerializable {
   /**
    * Set Enabled.
    *
-   * @param boolean $enabled
+   * @param bool $enabled
    *   Enabled.
    */
   public function setEnabled($enabled) {
diff --git a/modules/charts_highcharts/src/Settings/Highcharts/ChartLabel.php b/modules/charts_highcharts/src/Settings/Highcharts/ChartLabel.php
index 3d4995ad9e33ef41908475f8f718c97eee327c42..009b67b21a9921f3c2eab2cc2dbb3fc2d17c8312 100644
--- a/modules/charts_highcharts/src/Settings/Highcharts/ChartLabel.php
+++ b/modules/charts_highcharts/src/Settings/Highcharts/ChartLabel.php
@@ -26,7 +26,7 @@ class ChartLabel implements \JsonSerializable {
    *   Rotation.
    */
   public function setRotation($rotation) {
-    $this->rotation = (int)$rotation;
+    $this->rotation = (int) $rotation;
   }
 
   /**
diff --git a/modules/charts_highcharts/src/Settings/Highcharts/ChartLegend.php b/modules/charts_highcharts/src/Settings/Highcharts/ChartLegend.php
index 2bf6f5bfc25690ff98d1945c474ac4281ab703a1..67efd52130e6fd4b844291f1c4d76eb1b6fbf78f 100644
--- a/modules/charts_highcharts/src/Settings/Highcharts/ChartLegend.php
+++ b/modules/charts_highcharts/src/Settings/Highcharts/ChartLegend.php
@@ -120,7 +120,7 @@ class ChartLegend implements \JsonSerializable {
   /**
    * Is Floating.
    *
-   * @return boolean
+   * @return bool
    *   Floating.
    */
   public function isFloating() {
@@ -130,7 +130,7 @@ class ChartLegend implements \JsonSerializable {
   /**
    * Set Floating.
    *
-   * @param boolean $floating
+   * @param bool $floating
    *   Floating.
    */
   public function setFloating($floating) {
@@ -180,7 +180,7 @@ class ChartLegend implements \JsonSerializable {
   /**
    * Is Shadow.
    *
-   * @return boolean
+   * @return bool
    *   Shadow.
    */
   public function isShadow() {
@@ -190,7 +190,7 @@ class ChartLegend implements \JsonSerializable {
   /**
    * Set Shadow.
    *
-   * @param boolean $shadow
+   * @param bool $shadow
    *   Shadow.
    */
   public function setShadow($shadow) {
diff --git a/modules/charts_highcharts/src/Settings/Highcharts/DataLabelStatus.php b/modules/charts_highcharts/src/Settings/Highcharts/DataLabelStatus.php
index 305c97a5675e98d0b4e39cde1e49e9cf38297179..7dd954f795aafc08711e8dff435cc67c9d281f35 100644
--- a/modules/charts_highcharts/src/Settings/Highcharts/DataLabelStatus.php
+++ b/modules/charts_highcharts/src/Settings/Highcharts/DataLabelStatus.php
@@ -12,7 +12,7 @@ class DataLabelStatus implements \JsonSerializable {
   /**
    * Is Enabled.
    *
-   * @return boolean
+   * @return bool
    *   Enabled.
    */
   public function isEnabled() {
@@ -22,7 +22,7 @@ class DataLabelStatus implements \JsonSerializable {
   /**
    * Set Enabled.
    *
-   * @param boolean $enabled
+   * @param bool $enabled
    *   Enabled.
    */
   public function setEnabled($enabled) {
diff --git a/modules/charts_highcharts/src/Settings/Highcharts/Highcharts.php b/modules/charts_highcharts/src/Settings/Highcharts/Highcharts.php
index 7d990dc7eca1dd29825fec2d885c8ef7062c18d5..ee34c06e5ae7fbfe27682f97cfd193438aea0e69 100644
--- a/modules/charts_highcharts/src/Settings/Highcharts/Highcharts.php
+++ b/modules/charts_highcharts/src/Settings/Highcharts/Highcharts.php
@@ -10,13 +10,13 @@ class Highcharts implements \JsonSerializable {
   private $chart;
   private $title;
   private $xAxis;
-  /* private $yAxis; */
   private $tooltip;
   private $plotOptions;
   private $legend;
   private $credits;
   private $innerSize = '%20';
   private $series;
+  /* private $yAxis; */
 
   /**
    * Get Chart.
@@ -64,7 +64,7 @@ class Highcharts implements \JsonSerializable {
    * @return mixed
    *   X Axis.
    */
-  public function getXAxis() {
+  public function getAxisX() {
     return $this->xAxis;
   }
 
@@ -74,11 +74,11 @@ class Highcharts implements \JsonSerializable {
    * @param mixed $xAxis
    *   X Axis.
    */
-  public function setXAxis($xAxis) {
+  public function setAxisX($xAxis) {
     $this->xAxis = $xAxis;
   }
 
-  /*
+/*
   @return mixed
   public function getYAxis() {
     return $this->yAxis;
@@ -87,7 +87,7 @@ class Highcharts implements \JsonSerializable {
   public function setYAxis($yAxis) {
     $this->yAxis = $yAxis;
   }
-  */
+*/
 
   /**
    * Get Tooltip.
diff --git a/modules/charts_highcharts/src/Settings/Highcharts/Xaxis.php b/modules/charts_highcharts/src/Settings/Highcharts/Xaxis.php
index d30a0121075f492af1af8ea82a9b15bb816209b7..e846124a23a7c0aa8b6bdf46d417a2736c0fa62a 100644
--- a/modules/charts_highcharts/src/Settings/Highcharts/Xaxis.php
+++ b/modules/charts_highcharts/src/Settings/Highcharts/Xaxis.php
@@ -24,7 +24,7 @@ class Xaxis implements \JsonSerializable {
   /**
    * Set Categories.
    *
-   * @param array $categories
+   * @param mixed $categories
    *   Categories.
    */
   public function setCategories($categories) {
diff --git a/modules/charts_highcharts/src/Settings/Highcharts/YaxisLabel.php b/modules/charts_highcharts/src/Settings/Highcharts/YaxisLabel.php
index 0e6eac8d18b38e272f01b43f5ad22f73e2f37f52..caacf745487828c301b6e29011f4561cefb1664a 100644
--- a/modules/charts_highcharts/src/Settings/Highcharts/YaxisLabel.php
+++ b/modules/charts_highcharts/src/Settings/Highcharts/YaxisLabel.php
@@ -6,7 +6,7 @@ namespace Drupal\charts_highcharts\Settings\Highcharts;
  * Y Axis Label.
  */
 class YaxisLabel implements \JsonSerializable {
-  
+
   private $overflow = 'justify';
 
   /**
diff --git a/src/Annotation/Chart.php b/src/Annotation/Chart.php
old mode 100755
new mode 100644
index 2b95c0e6286f7a526d51991239cd2b8dce6f1b5f..d6360ea1ccefa2c81b71701127a733e9a1f2cb64
--- a/src/Annotation/Chart.php
+++ b/src/Annotation/Chart.php
@@ -1,5 +1,7 @@
 <?php
+
 namespace Drupal\charts\Annotation;
+
 use Drupal\Component\Annotation\Plugin;
 
 /**
@@ -7,18 +9,20 @@ use Drupal\Component\Annotation\Plugin;
  *
  * @Annotation
  */
-class Chart extends Plugin{
-    /**
-     * The plugin ID.
-     *
-     * @var string
-     */
-    public $id;
-    /**
-     * The plugin name.
-     *
-     * @var string
-     */
-    public $name;
+class Chart extends Plugin {
+
+  /**
+   * The plugin ID.
+   *
+   * @var string
+   */
+  public $id;
+
+  /**
+   * The plugin name.
+   *
+   * @var string
+   */
+  public $name;
 
-}
\ No newline at end of file
+}
diff --git a/src/Plugin/chart/AbstractChart.php b/src/Plugin/chart/AbstractChart.php
index a2422a97ff5017461ce723d1ee6a9f0dbbb14e4b..226f69e1431608b81b14fbb494506eea578d3be5 100644
--- a/src/Plugin/chart/AbstractChart.php
+++ b/src/Plugin/chart/AbstractChart.php
@@ -14,13 +14,6 @@ abstract class AbstractChart extends PluginBase implements ChartInterface, Conta
 
   use StringTranslationTrait;
 
-  /**
-   * {@inheritdoc}
-   */
-  public function __construct(array $configuration, $plugin_id, $plugin_definition) {
-    parent::__construct($configuration, $plugin_id, $plugin_definition);
-  }
-
   /**
    * {@inheritdoc}
    */
diff --git a/src/Plugin/chart/ChartInterface.php b/src/Plugin/chart/ChartInterface.php
old mode 100755
new mode 100644
index 22d64bee44ea8ef475a6b1758bdccbd85a906c79..a63b42787c0ba2881531a07b52dbffc24b84a98b
--- a/src/Plugin/chart/ChartInterface.php
+++ b/src/Plugin/chart/ChartInterface.php
@@ -1,21 +1,27 @@
 <?php
+
 namespace Drupal\charts\Plugin\chart;
+
 use Drupal\Component\Plugin\PluginInspectionInterface;
+
 /**
  * Defines an interface for Chart plugins.
  */
-interface ChartInterface extends PluginInspectionInterface{
-    /**
-     * Build Variables.
-     *
-     * @return an array
-     */
-    public function buildVariables($options, $categories, $seriesData, $attachmentDisplayOptions, &$variables, $chartId);
-    /**
-     * Return the name of the chart.
-     *
-     * @return string
-     *   returns the name as a string.
-     */
-    public function getChartName();
-}
\ No newline at end of file
+interface ChartInterface extends PluginInspectionInterface {
+
+  /**
+   * Build Variables.
+   *
+   * @return array
+   *   Variables.
+   */
+  public function buildVariables($options, $categories, $seriesData, $attachmentDisplayOptions, &$variables, $chartId);
+
+  /**
+   * Return the name of the chart.
+   *
+   * @return string
+   *   returns the name as a string.
+   */
+  public function getChartName();
+}
diff --git a/src/Plugin/chart/ChartManager.php b/src/Plugin/chart/ChartManager.php
old mode 100755
new mode 100644
index f3e4c4ff2b32adaea48266891239c7428bbd031c..99520888ea1d8403b834547e7366741dee80ef7c
--- a/src/Plugin/chart/ChartManager.php
+++ b/src/Plugin/chart/ChartManager.php
@@ -1,4 +1,5 @@
 <?php
+
 namespace Drupal\charts\Plugin\chart;
 
 use Drupal\Core\Plugin\DefaultPluginManager;
@@ -6,25 +7,24 @@ use Drupal\Core\Cache\CacheBackendInterface;
 use Drupal\Core\Extension\ModuleHandlerInterface;
 
 /**
- * @file
- *
- * Provides the Chart plugin plugin manager and manages discovery and instantiation of chart plugins.
- *
+ * Provides the Chart plugin plugin manager and manages discovery and
+ * instantiation of chart plugins.
  */
-class ChartManager extends DefaultPluginManager{
-    /**
-     * Constructor for ChartManager objects.
-     *
-     * @param \Traversable $namespaces
-     *   An object that implements \Traversable which contains the root paths
-     *   keyed by the corresponding namespace to look for plugin implementations.
-     * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
-     *   Cache backend instance to use.
-     * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
-     *   The module handler to invoke the alter hook with.
-     */
-    public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler){
-        parent::__construct('Plugin/chart',$namespaces,$module_handler,'Drupal\charts\Plugin\chart\ChartInterface',
-            'Drupal\charts\Annotation\Chart');
-    }
-}
\ No newline at end of file
+class ChartManager extends DefaultPluginManager {
+
+  /**
+   * Constructor for ChartManager objects.
+   *
+   * @param \Traversable $namespaces
+   *   An object that implements \Traversable which contains the root paths
+   *   keyed by the corresponding namespace to look for plugin implementations.
+   * @param \Drupal\Core\Cache\CacheBackendInterface $cache_backend
+   *   Cache backend instance to use.
+   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+   *   The module handler to invoke the alter hook with.
+   */
+  public function __construct(\Traversable $namespaces, CacheBackendInterface $cache_backend, ModuleHandlerInterface $module_handler) {
+    parent::__construct('Plugin/chart', $namespaces, $module_handler, 'Drupal\charts\Plugin\chart\ChartInterface', 'Drupal\charts\Annotation\Chart');
+  }
+
+}
diff --git a/src/Plugin/views/style/ChartsPluginStyleChart.php b/src/Plugin/views/style/ChartsPluginStyleChart.php
index 98fc94395254380ccd48a4fc27509661e449ffe1..e7e2b9fc49516c0f544016a80635075f4753ba4f 100644
--- a/src/Plugin/views/style/ChartsPluginStyleChart.php
+++ b/src/Plugin/views/style/ChartsPluginStyleChart.php
@@ -107,7 +107,7 @@ class ChartsPluginStyleChart extends StylePluginBase {
       $dataFieldsCounter++;
     }
 
-    // If total sum of dataFieldsValueState is less than 1, then no dataFields 
+    // If total sum of dataFieldsValueState is less than 1, then no dataFields
     // were selected otherwise 1 or more selected total sum will be greater
     // than 1.
     if (array_sum($dataFieldsValueState) < 1) {
diff --git a/src/Services/ChartsSettingsService.php b/src/Services/ChartsSettingsService.php
index d5c093fd2fc3b622b469f69c48539509f25c175f..08522474ac72cf852472cbe9c8d0e7d2952227a8 100644
--- a/src/Services/ChartsSettingsService.php
+++ b/src/Services/ChartsSettingsService.php
@@ -9,8 +9,8 @@ use Drupal\Core\Config\ConfigFactory;
  */
 class ChartsSettingsService implements ChartsSettingsServiceInterface {
 
-  /* private $editableConfigName = 'charts.settings'; */
   private $configFactory;
+  /* private $editableConfigName = 'charts.settings'; */
 
   /**
    * Construct.
@@ -30,4 +30,5 @@ class ChartsSettingsService implements ChartsSettingsServiceInterface {
 
     return $config->get('charts_default_settings');
   }
+
 }
diff --git a/src/Theme/ChartsInterface.php b/src/Theme/ChartsInterface.php
index 6b43398b46299db22fc77745de20c9d435bfd4e3..c01cbe7da9b67b73c6136806ec68b59036d0d83f 100644
--- a/src/Theme/ChartsInterface.php
+++ b/src/Theme/ChartsInterface.php
@@ -10,7 +10,7 @@ interface ChartsInterface {
   /**
    * Used to define a single axis.
    *
-   * Constant used in hook_charts_type_info() to declare chart types with a 
+   * Constant used in hook_charts_type_info() to declare chart types with a
    * single axis. For example a pie chart only has a single dimension.
    */
   const CHARTS_SINGLE_AXIS = 'y_only';
diff --git a/src/Util/Util.php b/src/Util/Util.php
index c2560c3911512885a45167369c76c052ee4b1292..29e6f05a27312e75c7e26d78e2ed540ad6180628 100644
--- a/src/Util/Util.php
+++ b/src/Util/Util.php
@@ -117,7 +117,8 @@ class Util {
   public static function checkMissingLibrary($moduleName = '', $libraryPath = '') {
     $module_path = drupal_get_path('module', $moduleName);
     if (!file_exists($module_path . $libraryPath)) {
-      drupal_set_message($this->t('Charting libraries for ' . $moduleName . ' might not be installed. Run \'composer install\' for ' . $moduleName . ' sub-module.'), 'error');
+      $text = 'Charting libraries for ' . $moduleName . ' might not be installed. Run \'composer install\' for ' . $moduleName . ' sub-module.';
+      drupal_set_message($this->t($text), 'error');
     }
   }