Adding ap02 code

AllenDowney · AllenDowney · commit 14359e1db6c8 · 2016-03-07T11:35:22.000-05:00
diff --git a/ap02/Drawing.java b/ap02/Drawing.java
@@ -0,0 +1,23 @@
+import java.awt.Canvas;
+import java.awt.Graphics;
+import javax.swing.JFrame;
+
+public class Drawing extends Canvas {
+
+    // this is here to suppress a warning; you can read about it at
+    // http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html
+    static final long serialVersionUID = 1;
+
+    public static void main(String[] args) {
+        JFrame frame = new JFrame("My Drawing");
+        Canvas drawing = new Drawing();
+        drawing.setSize(400, 400);
+        frame.add(drawing);
+        frame.pack();
+        frame.setVisible(true);
+    }
+
+    public void paint(Graphics g) {
+        g.fillOval(100, 100, 200, 200);
+    }
+}
diff --git a/ap02/Mickey.java b/ap02/Mickey.java
@@ -0,0 +1,45 @@
+import java.awt.Canvas;
+import java.awt.Graphics;
+import java.awt.Rectangle;
+
+import javax.swing.JFrame;
+
+
+public class Mickey extends Canvas {
+
+    // this is here to suppress a warning; you can read about it at
+    // http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html
+    static final long serialVersionUID = 1;
+
+    public static void main(String[] args) {
+        JFrame frame = new JFrame("My Drawing");
+        Canvas canvas = new Mickey();
+        canvas.setSize(400, 400);
+        frame.add(canvas);
+        frame.pack();
+        frame.setVisible(true);
+    }
+
+    public void paint(Graphics g) {
+        Rectangle bb = new Rectangle(100, 100, 200, 200);
+        mickey(g, bb);
+    }
+
+    public void mickey(Graphics g, Rectangle bb) {
+        boxOval(g, bb);
+
+        int dx = bb.width / 2;
+        int dy = bb.height / 2;
+        Rectangle half = new Rectangle(bb.x, bb.y, dx, dy);
+
+        half.translate(-dx / 2, -dy / 2);
+        boxOval(g, half);
+
+        half.translate(dx * 2, 0);
+        boxOval(g, half);
+    }
+
+    public void boxOval(Graphics g, Rectangle bb) {
+        g.fillOval(bb.x, bb.y, bb.width, bb.height);
+    }
+}
diff --git a/ap02/Moire.java b/ap02/Moire.java
@@ -0,0 +1,37 @@
+import java.awt.Canvas;
+import java.awt.Color;
+import java.awt.Graphics;
+
+import javax.swing.JFrame;
+
+
+public class Moire extends Canvas {
+
+    // this is here to suppress a warning; you can read about it at
+    // http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html
+    static final long serialVersionUID = 1;
+
+    public void paint(Graphics g) {
+        int i = 90;
+        while (i < getWidth()) {
+            g.drawOval (0, 0, i, i);
+            i = i + 3;
+        }
+    }
+
+    public static void main(String[] args) {
+        // make the frame
+        JFrame frame = new JFrame();
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        
+        // add the canvas
+        Canvas canvas = new Moire();
+        canvas.setSize(400, 400);
+        canvas.setBackground(Color.white);
+        frame.getContentPane().add(canvas);
+        
+        // show the frame
+        frame.pack();
+        frame.setVisible(true);
+    }
+}
