Hypnosis animation
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.RenderingHints;
import java.awt.Shape;
import java.awt.geom.GeneralPath;
import javax.swing.JComponent;
import javax.swing.JFrame;
public class Hypnosis1 extends JComponent implements Runnable {
private int[] coordinates;
private int[] deltas;
private Paint paint;
public Hypnosis1(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();
}
public void run() {
try {
while (true) {
timeStep();
repaint();
Thread.sleep(1000 / 24);
}
} catch (InterruptedException ie) {
}
}
public void paint(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);
}
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];
}
}
}
private 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(String[] args) {
JFrame f = new JFrame("Hypnosis");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new Hypnosis1(4));
f.setSize(300, 300);
f.setVisible(true);
}
}
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