73 lines
2.0 KiB
Java
73 lines
2.0 KiB
Java
import java.awt.Graphics;
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import java.awt.image.BufferedImage;
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import java.util.*;
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import javax.swing.JFrame;
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public class BrownianTree extends JFrame implements Runnable {
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BufferedImage I;
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private List<Particle> particles;
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static Random rand = new Random();
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public BrownianTree() {
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super("Brownian Tree");
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setBounds(100, 100, 400, 300);
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setDefaultCloseOperation(EXIT_ON_CLOSE);
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I = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_RGB);
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I.setRGB(I.getWidth() / 2, I.getHeight() / 2, 0xff00);
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particles = new LinkedList<Particle>();
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}
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@Override
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public void paint(Graphics g) {
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g.drawImage(I, 0, 0, this);
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}
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public void run() {
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for (int i = 0; i < 20000; i++) {
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particles.add(new Particle());
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}
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while (!particles.isEmpty()) {
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for (Iterator<Particle> it = particles.iterator(); it.hasNext();) {
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if (it.next().move()) {
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it.remove();
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}
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}
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repaint();
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}
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}
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public static void main(String[] args) {
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BrownianTree b = new BrownianTree();
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b.setVisible(true);
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new Thread(b).start();
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}
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private class Particle {
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private int x, y;
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private Particle() {
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x = rand.nextInt(I.getWidth());
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y = rand.nextInt(I.getHeight());
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}
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/* returns true if either out of bounds or collided with tree */
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private boolean move() {
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int dx = rand.nextInt(3) - 1;
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int dy = rand.nextInt(3) - 1;
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if ((x + dx < 0) || (y + dy < 0)
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|| (y + dy >= I.getHeight()) || (x + dx >= I.getWidth())) {
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return true;
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}
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x += dx;
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y += dy;
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if ((I.getRGB(x, y) & 0xff00) == 0xff00) {
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I.setRGB(x - dx, y - dy, 0xff00);
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return true;
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}
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return false;
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}
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}
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}
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