Particle fountain: Difference between revisions
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=={{header|Java}}==
<syntaxhighlight lang="java">
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.image.BufferStrategy;
import java.util.Arrays;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadLocalRandom;
import javax.swing.JFrame;
public final class ParticleFountainTask {
public static void main(String[] args) {
EventQueue.invokeLater( () -> {
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame("Particle Fountain");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
ParticleFountain particleFountain = new ParticleFountain(3_000, 1_000, 750);
frame.add(particleFountain);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
particleFountain.start();
} );
}
private static final class ParticleFountain extends Canvas {
public ParticleFountain(int aParticleCount, int aWidth, int aHeight) {
particleCount = aParticleCount;
width = aWidth;
height = aHeight;
saturation = 0.6;
spread = 1.5;
range = 1.5;
reciprocate = false;
setPreferredSize( new Dimension(width, height) );
addKeyListener( new InputHandler() );
executorService = Executors.newSingleThreadExecutor();
}
public void start() {
requestFocus();
createBufferStrategy(2);
executorService.execute( new DrawingCycle() );
}
private final class DrawingCycle implements Runnable {
public DrawingCycle() {
positions = new double[2 * particleCount];
velocities = new double[2 * particleCount];
lifetimes = new double[particleCount];
points = new Point[particleCount];
Arrays.fill(points, new Point(0, 0) );
random = ThreadLocalRandom.current();
}
@Override
public void run() {
bufferStrategy = getBufferStrategy();
while ( true ) {
update(0.005);
draw();
}
}
private void update(double animationSpeed) {
int xIndex = 0;
int yIndex = 1;
pointIndex = 0;
for ( int index = 0; index < particleCount; index++ ) {
boolean showParticle = false;
if ( lifetimes[index] <= 0.0 ) {
if ( random.nextDouble() < animationSpeed ) {
lifetimes[index] = 2.5;
positions[xIndex] = width / 20;
positions[yIndex] = height / 10;
velocities[xIndex] =
10 * ( spread * random.nextDouble() - spread / 2 + additionalXSpeed() );
velocities[yIndex] = ( random.nextDouble() - 2.9 ) * height / 20.5;
showParticle = true;
}
} else {
if ( positions[yIndex] > height / 10 && velocities[yIndex] > 0 ) {
velocities[yIndex] *= -0.3; // bounce particle
}
velocities[yIndex] += animationSpeed * height / 10;
positions[xIndex] += velocities[xIndex] * animationSpeed;
positions[yIndex] += velocities[yIndex] * animationSpeed;
lifetimes[index] -= animationSpeed;
showParticle = true;
}
if ( showParticle ) {
points[pointIndex] = new Point((int) ( positions[xIndex] * 10 ),
(int) ( positions[yIndex] * 10 ));
pointIndex += 1;
}
xIndex += 2;
yIndex = xIndex + 1;
}
}
private void draw() {
Graphics2D graphics2D = (Graphics2D) bufferStrategy.getDrawGraphics();
graphics2D.setColor(Color.BLACK);
graphics2D.fillRect(0, 0, getWidth(), getHeight());
for ( int i = 0; i < pointIndex; i++ ) {
graphics2D.setColor(Color.getHSBColor(random.nextFloat(), (float) saturation, 1.0F));
graphics2D.fillOval(points[i].x, points[i].y, 5, 5);
}
graphics2D.dispose();
bufferStrategy.show();
}
private double additionalXSpeed() {
return ( reciprocate ) ? range * Math.sin(System.currentTimeMillis() / 1_000) : 0.0;
}
private double[] positions;
private double[] velocities;
private double[] lifetimes;
private int pointIndex;
private Point[] points;
private BufferStrategy bufferStrategy;
private ThreadLocalRandom random;
} // End DrawingCycle class
private final class InputHandler extends KeyAdapter {
@Override
public void keyPressed(KeyEvent aKeyEvent) {
final int keyCode = aKeyEvent.getKeyCode();
switch ( keyCode ) {
case KeyEvent.VK_UP -> saturation = Math.min(saturation + 0.1, 1.0);
case KeyEvent.VK_DOWN -> saturation = Math.max(saturation - 0.1, 0.0);
case KeyEvent.VK_PAGE_UP -> spread = Math.min(spread + 0.1, 5.0);
case KeyEvent.VK_PAGE_DOWN -> spread = Math.max(spread - 0.1, 0.5);
case KeyEvent.VK_RIGHT -> range = Math.min(range + 0.1, 2.0);
case KeyEvent.VK_LEFT -> range = Math.max(range + 0.1, 0.1);
case KeyEvent.VK_SPACE -> reciprocate = ! reciprocate;
case KeyEvent.VK_Q -> Runtime.getRuntime().exit(0);
default -> { /* Take no action */ }
}
}
} // End InputHandler class
private int particleCount;
private int width;
private int height;
private double saturation;
private double spread;
private double range;
private boolean reciprocate;
private ExecutorService executorService;
} // End ParticleFountain class
} // End ParticleFountainTask class
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