Hypnosispublic class Hypnosis extends JComponent implements Runnable
| Fields Summary |
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| private int[] | coordinates | | private int[] | deltas | | private Paint | paint |
| Constructors Summary |
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public Hypnosis(int numberOfSegments)
int numberOfCoordinates = numberOfSegments * 4 + 2;
coordinates = new int[numberOfCoordinates];
deltas = new int[numberOfCoordinates];
for (int i = 0 ; i < numberOfCoordinates; i++) {
coordinates[i] = (int)(Math.random( ) * 300);
deltas[i] = (int)(Math.random( ) * 4 + 3);
if (deltas[i] > 4) deltas[i] = -(deltas[i] - 3);
}
paint = new GradientPaint(0, 0, Color.blue,
20, 10, Color.red, true);
Thread t = new Thread(this);
t.start( );
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| Methods Summary |
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| private java.awt.Shape | createShape()
GeneralPath path = new GeneralPath( );
path.moveTo(coordinates[0], coordinates[1]);
for (int i = 2; i < coordinates.length; i += 4)
path.quadTo(coordinates[i], coordinates[i + 1],
coordinates[i + 2], coordinates[i + 3]);
path.closePath( );
return path;
| | public static void | main(java.lang.String[] args)
JFrame f = new JFrame("Hypnosis");
f.addWindowListener(new WindowAdapter( ) {
public void windowClosing(WindowEvent we) { System.exit(0); }
});
Container c = f.getContentPane( );
c.setLayout(new BorderLayout( ));
c.add(new Hypnosis(4));
f.setSize(300, 300);
f.setLocation(100, 100);
f.setVisible(true);
| | public void | paint(java.awt.Graphics g)
Graphics2D g2 = (Graphics2D)g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
Shape s = createShape( );
g2.setPaint(paint);
g2.fill(s);
g2.setPaint(Color.white);
g2.draw(s);
| | public void | run()
try {
while (true) {
timeStep( );
repaint( );
Thread.sleep(1000 / 24);
}
}
catch (InterruptedException ie) {}
| | private void | timeStep()
Dimension d = getSize( );
if (d.width == 0 || d.height == 0) return;
for (int i = 0; i < coordinates.length; i++) {
coordinates[i] += deltas[i];
int limit = (i % 2 == 0) ? d.width : d.height;
if (coordinates[i] < 0) {
coordinates[i] = 0;
deltas[i] = -deltas[i];
}
else if (coordinates[i] > limit) {
coordinates[i] = limit - 1;
deltas[i] = -deltas[i];
}
}
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