8000 revised ch16 examples · ilhamgunawan/ThinkJavaCode2@869bade · GitHub
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ChrisMayfieldChrisMayfield
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revised ch16 examples
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4 files changed

+18
-4
lines changed

4 files changed

+18
-4
lines changed

‎ch16/BlinkingPolygon.java‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
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public class BlinkingPolygon extends RegularPolygon {
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protected boolean visible;
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private int count;
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protected int count;
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/**
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* Constructs a blinking polygon.

‎ch16/ColorPolygon.java‎

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Original file line numberDiff line numberDiff line change
@@ -32,4 +32,17 @@ public void step() {
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// do nothing
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}
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/**
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* Test code that creates a ColorPolygon.
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*
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* @param args command-line arguments
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*/
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public static void main(String[] args) {
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ColorPolygon p = new ColorPolygon();
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p.addPoint(57, 110);
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p.addPoint(100, 35);
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p.addPoint(143, 110);
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p.color = Color.GREEN;
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}
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}

‎ch16/RegularPolygon.java‎

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@@ -56,13 +56,13 @@ public RegularPolygon(int nsides, int radius, Color color) {
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this.ypoints = new int[nsides];
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this.color = color;
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// the angle (in radians) for each vertex
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// the amount to rotate for each vertex (in radians)
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double angle = 2.0 * Math.PI / nsides;
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// rotation that makes the polygon right-side up
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double rotate = Math.PI / nsides + Math.PI / 2.0;
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// compute x and y coordinates, centered around the origin
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// compute x and y coordinates, centered at the origin
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for (int i = 0; i < nsides; i++) {
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double x = radius * Math.cos(i * angle + rotate);
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xpoints[i] = (int) Math.round(x);

‎ch16/VideoGame.java‎

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Original file line numberDiff line numberDiff line change
@@ -16,10 +16,11 @@ public class VideoGame implements ActionListener {
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* Set up the drawing and window frame.
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*/
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public VideoGame() {
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Sprite sprite = new Sprite("face-smile.png", 25, 150);
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Sprite sprite = new Sprite("face-smile.png", 50, 50);
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drawing = new Drawing(800, 600);
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drawing.add(sprite);
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drawing.addKeyListener(sprite);
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drawing.setFocusable(true);
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JFrame frame = new JFrame("Video Game");
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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frame.add(drawing);

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