add 2-7-Graphics

java/2-7-Graphics/SimpleDraw.java

+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+
+public class SimpleDraw {
+    public static void main(String[] args) {
+        JFrame f = new JFrame("SimpleDraw"); 
+        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        f.setSize(300, 300);                   
+        f.setContentPane(new Canvas());         
+        f.setVisible(true);                     
+    }
+}
+
+// JComponent is a base class for custom components
+class Canvas extends JComponent {
+	
+    Point M = new Point(); // mouse point
+    Point C = new Point(150, 150); // click point
+
+	Canvas(){
+		super();
+		this.addMouseListener(new MouseAdapter(){
+			public void mouseClicked(MouseEvent e){
+				C.x = e.getX();
+				C.y = e.getY();
+				repaint();
+			}
+		});
+
+        this.addMouseMotionListener(new MouseAdapter(){
+            public void mouseMoved(MouseEvent e){
+                M.x = e.getX();
+                M.y = e.getY();
+                repaint();
+            }
+        }); 
+      
+	}
+
+    // custom graphics drawing
+    public void paintComponent(Graphics g) {
+        super.paintComponent(g);
+        // cast to get 2D drawing methods
+        Graphics2D g2 = (Graphics2D) g; 
+
+        g2.setColor(Color.BLACK);
+        g2.setStroke(new BasicStroke(2));
+        g2.drawLine(C.x, C.y, M.x, M.y);
+        g2.fillOval(M.x - 5, M.y - 5, 10, 10);
+
+        g2.setColor(Color.RED);
+        g2.fillOval(C.x - 5, C.y - 5, 10, 10); 
+
+        g2.drawString(String.format("%d,%d", C.x, C.y), C.x + 10, C.y + 10);       
+
+        g2.setColor(Color.BLACK);
+        g2.drawString(String.format("%d,%d", M.x, M.y), M.x + 10, M.y + 10);
+    }
+}
+

java/2-7-Graphics/Transform1.java

+/*
+* CS 349 Java Code Examples
+*
+* Transform1  Shows how to "manually" transform a shape model. NOTE: in practice,
+              you don't want do this. Use Graphics2D matrix tranformations instead.
+*
+*/
+import javax.swing.JFrame;
+import javax.swing.JComponent;
+import javax.swing.JButton;
+import java.awt.*;
+import java.awt.geom.*;
+import java.util.ArrayList;
+import javax.vecmath.*;
+import java.lang.Math.*;
+import java.util.Random;
+import java.awt.event.*;
+
+// create the window and run the demo
+public class Transform1 {
+	
+    public static void main(String[] args) {
+        // create the window        
+    	Canvas canvas = new Canvas();
+        JFrame f = new JFrame("Transform1"); // jframe is the app window
+        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        f.setSize(400, 400); // window size
+        f.setContentPane(canvas); // add canvas to jframe         
+        f.setVisible(true); // show the window
+    }
+} 
+
+class Canvas extends JComponent {
+	
+    // the house shape model (position is centred at top left corner)
+    private Polygon shape = 
+        new Polygon(new int[] { -50, 50,  50,   0, -50}, 
+                    new int[] { 75,  75, -25, -75, -25}, 5);
+
+	Point2d M = new Point2d();
+
+	Canvas() {
+		// events
+        this.addMouseMotionListener(new MouseAdapter(){
+            public void mouseMoved(MouseEvent e){
+                M.x = e.getX();
+                M.y = e.getY();
+                repaint();
+            }});
+	}
+    
+    // custom graphics drawing 
+    public void paintComponent(Graphics g) {
+    	super.paintComponent(g); // JPanel paint
+    	Graphics2D g2 = (Graphics2D)g;
+    	
+    	// the shape will get transformed into "world" coordinates
+
+		// transform by hand 
+		// get copy of shape
+		Polygon transShape = 
+            new Polygon(shape.xpoints, shape.ypoints, shape.npoints);
+
+
+		rotate(transShape, 45);
+        scale(transShape, 2, 1);        
+		translate(transShape, M.x, M.y);
+
+     	g2.setStroke(new BasicStroke(3)); 
+    	g2.drawPolygon(transShape.xpoints, transShape.ypoints, transShape.npoints);
+    }
+
+    // non-matrix translate
+    void translate(Polygon s, double tx, double ty) {
+    	for (int i = 0; i < s.npoints; i++) {
+			s.xpoints[i] += tx;
+			s.ypoints[i] += ty;
+		}
+    }
+
+    // non-matrix scale
+    void scale(Polygon s, double sx, double sy) {
+    	for (int i = 0; i < s.npoints; i++) {
+			s.xpoints[i] *= sx;
+			s.ypoints[i] *= sy;
+		}
+    }   
+
+    // no-matrix rotate
+    void rotate(Polygon s, double theta) {
+        double rad = Math.toRadians(theta);
+    	for (int i = 0; i < s.npoints; i++) {
+            int x = s.xpoints[i];
+            int y = s.ypoints[i];
+			s.xpoints[i] = (int)((double)x * Math.cos(rad) - y * Math.sin(rad));
+			s.ypoints[i] = (int)((double)x * Math.sin(rad) + y * Math.cos(rad));
+		}
+    }   
+
+}

java/2-7-Graphics/makefile

+# super simple makefile
+# call it using 'make NAME=name_of_code_file_without_extension'
+# (assumes a .java extension)
+NAME = SimpleDraw
+# you may need to pass OS=win to run on windows
+OS = 
+
+# HACK: vecmath is included regardless if needed
+all:
+	@echo "Compiling..."
+	javac -cp vecmath.jar $(NAME).java
+
+run: all
+# windows needs a semicolon
+ifeq ($(OS),win)
+		@echo "Running on windows ..."
+		java -cp "vecmath.jar;." $(NAME)
+# everyone else likes a colon
+else
+		@echo "Running ..."
+		java -cp "vecmath.jar:." $(NAME)
+endif
+
+clean:
+	rm -rf *.class