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examples/zm_cookieclicker/NumberParticleEmitter.java

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+import schule.ngb.zm.Drawable;
+import schule.ngb.zm.Updatable;
+import schule.ngb.zm.shapes.Text;
+
+import java.awt.Graphics2D;
+import java.util.ArrayList;
+
+public class NumberParticleEmitter implements Updatable, Drawable {
+
+	public class NumberParticle extends Text implements Updatable {
+
+		double velX = 0, velY = 0, accX = 0, accY = 0;
+
+		double life = 0;
+
+		public NumberParticle() {
+			super(0, 0, "0");
+			// life = particleLifespan;
+		}
+
+		@Override
+		public boolean isActive() {
+			return (life <= 0);
+		}
+
+		public void activate() {
+			x = emitterX;
+			y = emitterY;
+			life = particleLifespan;
+		}
+
+		@Override
+		public void update( double delta ) {
+			if( isActive() ) {
+				velX += accX;
+				velY += accY;
+				x += velX;
+				y += velY;
+
+				life -= delta;
+				setFillColor(fillColor, (int) interpolate(0, 255, life / particleLifespan));
+			}
+		}
+
+	}
+
+	private int particlesPerSecond, maxParticles;
+
+	private double particleLifespan;
+
+	private ArrayList<NumberParticle> particles;
+
+	private int activeParticles = 0;
+
+	private double lastEmit = 0.0;
+
+	private double emitterX, emitterY;
+
+	public NumberParticleEmitter( double x, double y, int particlesPerSecond, double particleLifespan ) {
+		emitterX = x;
+		emitterY = y;
+
+		this.particlesPerSecond = particlesPerSecond;
+		this.particleLifespan = particleLifespan;
+
+		maxParticles = (int) Math.ceil(particlesPerSecond * particleLifespan);
+		particles = new ArrayList<>(maxParticles);
+
+		for( int i = 0; i < maxParticles; i++ ) {
+			particles.add(new NumberParticle());
+		}
+	}
+
+	@Override
+	public boolean isVisible() {
+		return activeParticles > 0;
+	}
+
+	@Override
+	public void draw( Graphics2D graphics ) {
+		for( NumberParticle p : particles ) {
+			if( p.isActive() ) {
+				p.draw(graphics);
+			}
+		}
+	}
+
+	@Override
+	public boolean isActive() {
+		return isVisible();
+	}
+
+	public void emitParticle( int number ) {
+		particles.add(new NumberParticle());
+	}
+
+	@Override
+	public void update( double delta ) {
+		//lastEmit -= delta;
+
+		for( NumberParticle p : particles ) {
+			if( p.isActive() ) {
+				p.update(delta);
+			} /*else if( lastEmit <= 0 ) {
+				p.activate();
+				lastEmit += 1/(double)particlesPerSecond;
+			}*/
+		}
+	}
+
+}