Updated ParticleEmitters and Factories

src/main/java/schule/ngb/zm/Vector.java

@@ -191,6 +191,22 @@ public class Vector extends Point2D.Double {
 		return new Vector(x, y);
 	}
 
+	public int getIntX() {
+		return (int)this.x;
+	}
+
+	public int getRoundedX() {
+		return (int)Math.round(this.x);
+	}
+
+	public int getIntY() {
+		return (int)this.y;
+	}
+
+	public int getRoundedY() {
+		return (int)Math.round(this.y);
+	}
+
 	/**
 	 * Setzt die Komponenten dieses Vektors neu.
 	 *

src/main/java/schule/ngb/zm/particles/BasicParticle.java

@@ -0,0 +1,77 @@
+package schule.ngb.zm.particles;
+
+import schule.ngb.zm.Color;
+import schule.ngb.zm.Vector;
+
+import java.awt.Graphics2D;
+
+public class BasicParticle extends Particle {
+
+	protected Color color, startColor, finalColor;
+
+
+	public BasicParticle() {
+		super();
+	}
+
+	public BasicParticle( Color startColor ) {
+		this(startColor, null);
+	}
+
+	public BasicParticle( Color startColor, Color finalColor ) {
+		super();
+
+		this.color = startColor;
+		this.startColor = startColor;
+		this.finalColor = finalColor;
+	}
+
+	public Color getColor() {
+		return color;
+	}
+
+	public void setColor( Color pColor ) {
+		this.color = pColor;
+	}
+
+	public Color getStartColor() {
+		return startColor;
+	}
+
+	public void setStartColor( Color pStartColor ) {
+		this.startColor = pStartColor;
+	}
+
+	public Color getFinalColor() {
+		return finalColor;
+	}
+
+	public void setFinalColor( Color pFinalColor ) {
+		this.finalColor = pFinalColor;
+	}
+
+	@Override
+	public void spawn( int pLifetime, Vector pPosition, Vector pVelocity ) {
+		super.spawn(pLifetime, pPosition, pVelocity);
+		this.color = this.startColor;
+	}
+
+	@Override
+	public void update( double delta ) {
+		super.update(delta);
+
+		if( isActive() && startColor != null && finalColor != null ) {
+			double t = 1.0 - lifetime / maxLifetime;
+			this.color = Color.interpolate(startColor, finalColor, t);
+		}
+	}
+
+	@Override
+	public void draw( Graphics2D graphics ) {
+		if( isActive() && this.color != null ) {
+			graphics.setColor(this.color.getJavaColor());
+			graphics.fillOval(position.getIntX() - 3, position.getIntY() - 3, 6, 6);
+		}
+	}
+
+}

src/main/java/schule/ngb/zm/particles/BasicParticleFactory.java

@@ -0,0 +1,43 @@
+package schule.ngb.zm.particles;
+
+import schule.ngb.zm.Color;
+
+public class BasicParticleFactory implements ParticleFactory {
+
+	private final Color startColor;
+
+	private final Color finalColor;
+
+	private boolean fadeOut = true;
+
+	public BasicParticleFactory() {
+		this(null, null);
+	}
+
+	public BasicParticleFactory( Color startColor ) {
+		this(startColor, null);
+	}
+
+	public BasicParticleFactory( Color startColor, Color finalColor ) {
+		this.startColor = startColor;
+		this.finalColor = finalColor;
+	}
+
+	public void setFadeOut( boolean pFadeOut ) {
+		this.fadeOut = pFadeOut;
+	}
+
+	@Override
+	public Particle createParticle() {
+		Color finalClr = finalColor;
+		if( fadeOut ) {
+			if( finalColor != null ) {
+				finalClr = new Color(finalColor, 0);
+			} else if( startColor != null ) {
+				finalClr = new Color(startColor, 0);
+			}
+		}
+		return new BasicParticle(startColor, finalClr);
+	}
+
+}

src/main/java/schule/ngb/zm/particles/GenericParticleFactory.java

@@ -0,0 +1,49 @@
+package schule.ngb.zm.particles;
+
+import schule.ngb.zm.util.Log;
+
+import java.util.Arrays;
+import java.util.function.Supplier;
+
+public class GenericParticleFactory<T extends Particle> implements ParticleFactory {
+
+	private final Class<T> type;
+
+	private final Supplier<T> supplier;
+
+	public GenericParticleFactory( Class<T> type, Object... params ) {
+		this.type = type;
+
+		// Create paramTypes array once
+		Class<?>[] paramTypes = new Class<?>[params.length];
+		for( int i = 0; i < params.length; i++ ) {
+			paramTypes[i] = params[i].getClass();
+		}
+
+		this.supplier = () -> {
+			T p = null;
+			try {
+				p = GenericParticleFactory.this.type.getDeclaredConstructor(paramTypes).newInstance(params);
+			} catch( Exception ex ) {
+				LOG.error( ex,
+					"Unable to create new Particle of type %s",
+					GenericParticleFactory.this.type.getCanonicalName()
+				);
+			}
+			return p;
+		};
+	}
+
+	public GenericParticleFactory( Supplier<T> supplier ) {
+		this.supplier = supplier;
+		this.type = (Class<T>)supplier.get().getClass();
+	}
+
+	@Override
+	public Particle createParticle() {
+		return this.supplier.get();
+	}
+
+	private static final Log LOG = Log.getLogger(GenericParticleFactory.class);
+
+}

src/main/java/schule/ngb/zm/particles/Particle.java

@@ -0,0 +1,60 @@
+package schule.ngb.zm.particles;
+
+import schule.ngb.zm.Drawable;
+import schule.ngb.zm.Updatable;
+import schule.ngb.zm.Vector;
+
+
+public abstract class Particle extends PhysicsObject implements Updatable, Drawable {
+
+	protected double maxLifetime = 0, lifetime = 0;
+
+
+	public Particle() {
+		super();
+	}
+
+	public void spawn( int pLifetime, Vector pPosition, Vector pVelocity ) {
+		this.maxLifetime = pLifetime;
+		this.lifetime = pLifetime;
+		this.position = pPosition.copy();
+		this.velocity = pVelocity.copy();
+		this.acceleration = new Vector();
+	}
+
+	@Override
+	public boolean isActive() {
+		return lifetime > 0;
+	}
+
+	@Override
+	public boolean isVisible() {
+		return isActive();
+	}
+
+	public double getLifetime() {
+		return lifetime;
+	}
+
+	public void setLifetime( double pLifetime ) {
+		this.lifetime = pLifetime;
+	}
+
+	public double getMaxLifetime() {
+		return maxLifetime;
+	}
+
+	public void setMaxLifetime( double pMaxLifetime ) {
+		this.maxLifetime = pMaxLifetime;
+	}
+
+	@Override
+	public void update( double delta ) {
+		super.update(delta);
+		// lifetime -= delta;
+		lifetime -= 1;
+
+		// TODO: (ngb) calculate delta based on lifetime?
+	}
+
+}

src/main/java/schule/ngb/zm/particles/ParticleEmitter.java

@@ -0,0 +1,174 @@
+package schule.ngb.zm.particles;
+
+
+import schule.ngb.zm.Drawable;
+import schule.ngb.zm.Updatable;
+import schule.ngb.zm.Vector;
+
+import java.awt.Graphics2D;
+
+public class ParticleEmitter implements Updatable, Drawable {
+
+	protected ParticleFactory particleFactory;
+
+	private int particlesPerFrame;
+
+	private int particleLifetime = 180;
+
+	private Particle[] particles;
+
+	private boolean active = false;
+
+	private Particle nextParticle;
+
+	public Vector position;
+
+	public Vector direction = new Vector();
+
+	public double strength = 100.0;
+
+	public int angle = 0;
+
+	public double randomness = 0.0;
+
+	// private Vortex vortex = null;
+
+	public ParticleEmitter( double pX, double pY, int pParticleLifetime, int pParticlesPerFrame, ParticleFactory pFactory ) {
+		this.position = new Vector(pX, pY);
+		this.particlesPerFrame = pParticlesPerFrame;
+		this.particleLifetime = pParticleLifetime;
+		this.particleFactory = pFactory;
+
+		// Create particle pool
+		this.particles = new Particle[particlesPerFrame * pParticleLifetime];
+		this.direction = Vector.random(8, 16).normalize();
+
+		// vortex = new Vortex(position.copy().add(-10, -10), -.2, 8);
+	}
+
+	@Override
+	public boolean isActive() {
+		return active;
+	}
+
+	@Override
+	public boolean isVisible() {
+		return active;
+	}
+
+	public void start() {
+		this.direction.normalize();
+
+		// Partikel initialisieren
+		for( int i = 0; i < particles.length; i++ ) {
+			particles[i] = particleFactory.createParticle();
+		}
+
+		active = true;
+	}
+
+	public void stop() {
+		for( int i = 0; i < particles.length; i++ ) {
+			particles[i].setLifetime(0);
+			particles[i] = null;
+		}
+		active = false;
+	}
+
+	private Particle getNextParticle() {
+		// TODO: improve by caching next particle
+		for( Particle p : particles ) {
+			if( p != null && !p.isActive() ) {
+				return p;
+			}
+		}
+		return null;
+	}
+
+	public void emitParticle() {
+		int ppf = particlesPerFrame;
+		Particle nextParticle = getNextParticle();
+		while( ppf > 0 && nextParticle != null ) {
+			int lifetime = (int) random(particleLifetime);
+
+			double rotation = (angle / 2.0) - (int) (Math.random() * angle);
+			Vector velocity = direction.copy().scale(strength).rotate(rotation);
+			velocity.scale(random());
+
+			nextParticle.spawn(lifetime, this.position, velocity);
+			nextParticle = getNextParticle();
+			ppf -= 1;
+		}
+	}
+
+	@Override
+	public void update( double delta ) {
+		emitParticle();
+
+		boolean _active = false;
+		for( Particle particle : particles ) {
+			if( particle != null ) {
+				if( particle.isActive() ) {
+//					if( vortex != null ) {
+//						vortex.attract(particle);
+//					}
+					particle.update(delta);
+					_active = true;
+				}
+			}
+		}
+		this.active = _active;
+	}
+
+	private double random() {
+		return 1.0 - (Math.random() * randomness);
+	}
+
+	private double random( double pZahl ) {
+		return pZahl * random();
+	}
+
+	@Override
+	public void draw( Graphics2D graphics ) {
+		java.awt.Color current = graphics.getColor();
+		for( Particle particle : particles ) {
+			if( particle != null && particle.isVisible() ) {
+				particle.draw(graphics);
+			}
+		}
+
+//		if( vortex != null ) {
+//			graphics.setColor(java.awt.Color.BLACK);
+//			double vscale = (4 * vortex.scale);
+//			graphics.fillOval((int) (vortex.position.x - vscale * .5), (int) (vortex.position.y - vscale * .5), (int) vscale, (int) vscale);
+//		}
+		graphics.setColor(current);
+	}
+
+
+	class Vortex {
+
+		Vector position;
+
+		double speed = 1.0, scale = 1.0;
+
+		public Vortex( Vector pPosition, double pSpeed, double pScale ) {
+			this.position = pPosition.copy();
+			this.scale = pScale;
+			this.speed = pSpeed;
+		}
+
+		public void attract( Particle pPartikel ) {
+			Vector diff = Vector.sub(pPartikel.position, this.position);
+			double dx = -diff.y * this.speed;
+			double dy = diff.x * this.speed;
+			double f = 1.0 / (1.0 + (dx * dx + dy * dy) / scale);
+
+			pPartikel.position.x += (diff.x - pPartikel.velocity.x) * f;
+			pPartikel.position.y += (diff.y - pPartikel.velocity.y) * f;
+
+		}
+
+	}
+
+}

src/main/java/schule/ngb/zm/particles/ParticleFactory.java

@@ -0,0 +1,7 @@
+package schule.ngb.zm.particles;
+
+public interface ParticleFactory {
+
+	Particle createParticle();
+
+}

src/main/java/schule/ngb/zm/particles/PhysicsObject.java

@@ -0,0 +1,69 @@
+package schule.ngb.zm.particles;
+
+import schule.ngb.zm.Updatable;
+import schule.ngb.zm.Vector;
+
+
+public abstract class PhysicsObject implements Updatable {
+
+	protected Vector position, velocity, acceleration;
+
+	protected double mass = 1.0;
+
+
+	public PhysicsObject() {
+		position = new Vector();
+		velocity = new Vector();
+		acceleration = new Vector();
+	}
+
+	public PhysicsObject( Vector pPosition ) {
+		position = pPosition.copy();
+		velocity = new Vector();
+		acceleration = new Vector();
+	}
+
+	public Vector getAcceleration() {
+		return acceleration;
+	}
+
+	public void setAcceleration( Vector pAcceleration ) {
+		this.acceleration = pAcceleration;
+	}
+
+	public double getMass() {
+		return mass;
+	}
+
+	public void setMass( double pMass ) {
+		this.mass = pMass;
+	}
+
+	public Vector getPosition() {
+		return position;
+	}
+
+	public void setPosition( Vector pPosition ) {
+		this.position = pPosition;
+	}
+
+	public Vector getVelocity() {
+		return velocity;
+	}
+
+	public void setVelocity( Vector pVelocity ) {
+		this.velocity = pVelocity;
+	}
+
+	public void accelerate( Vector pAcceleration ) {
+		acceleration.add(Vector.div(pAcceleration, mass));
+	}
+
+	@Override
+	public void update( double delta ) {
+		velocity.add(acceleration);
+		position.add(Vector.scale(velocity, delta));
+		acceleration.scale(0.0);
+	}
+
+}

src/main/java/schule/ngb/zm/particles/StarParticle.java

@@ -0,0 +1,35 @@
+package schule.ngb.zm.particles;
+
+import schule.ngb.zm.Color;
+
+import java.awt.Graphics2D;
+
+public class StarParticle extends BasicParticle {
+
+	public StarParticle() {
+		super();
+		this.startColor = Color.PURE_GREEN;
+	}
+
+	public StarParticle( Color startColor ) {
+		this(startColor, null);
+	}
+
+	public StarParticle( Color startColor, Color finalColor ) {
+		super();
+
+		this.color = startColor;
+		this.startColor = startColor;
+		this.finalColor = finalColor;
+	}
+
+	@Override
+	public void draw( Graphics2D graphics ) {
+		if( isActive() && this.color != null ) {
+			graphics.setColor(this.color.getJavaColor());
+			graphics.drawLine((int) position.x - 3, (int) position.y - 3, (int) position.x + 3, (int) position.y + 3);
+			graphics.drawLine((int) position.x + 3, (int) position.y - 3, (int) position.x - 3, (int) position.y + 3);
+		}
+	}
+
+}

src/test/java/schule/ngb/zm/particles/ParticleExample.java

@@ -0,0 +1,158 @@
+package schule.ngb.zm.particles;
+
+import schule.ngb.zm.*;
+import schule.ngb.zm.layers.DrawableLayer;
+import schule.ngb.zm.layers.DrawingLayer;
+
+import java.awt.Graphics2D;
+
+public class ParticleExample extends Testmaschine {
+
+	public static void main( String[] args ) {
+		new ParticleExample();
+	}
+
+	public ParticleExample() {
+		super();
+	}
+
+	ParticleEmitter pe1, pe2, pe3;
+
+	Rocket r;
+
+	public void setup() {
+		getLayer(DrawingLayer.class).hide();
+		background.setColor(0);
+		drawing.noStroke();
+		drawing.setFillColor(WHITE);
+		for( int i = 0; i < 1000; i++ ) {
+			drawing.point(random(0, canvasWidth), random(0, canvasHeight));
+		}
+
+		pe1 = new ParticleEmitter(
+			100, 100, 50, 5,
+			// new BasicParticleFactory(PINK, BLUE)
+			new GenericParticleFactory<Particle>(() -> {
+				return new Particle() {
+					@Override
+					public void draw( Graphics2D graphics ) {
+						graphics.setColor(Color.MAGENTA.getJavaColor());
+						graphics.rotate(Constants.radians(45), (int) position.x, (int) position.y);
+						graphics.drawRect((int) position.x - 3, (int) position.y - 3, 6, 6);
+						graphics.rotate(Constants.radians(-45), (int) position.x, (int) position.y);
+					}
+				};
+			})
+		);
+		pe1.randomness = .2;
+		pe1.angle = 45;
+		pe1.strength = 200;
+
+
+		pe2 = new ParticleEmitter(
+			300, 300, 50, 10,
+			new GenericParticleFactory(() -> new StarParticle(RED, new Color(BLUE, 55)))
+			//new GenericParticleFactory(StarParticle.class, RED, new Color(BLUE, 55))
+		);
+		pe2.direction = NORTH.asVector().scale(100);
+		pe2.randomness = .8;
+		pe2.angle = 90;
+		pe2.strength = 200;
+
+
+		pe3 = new ParticleEmitter(
+			100, 400, 20, 8,
+			new BasicParticleFactory(YELLOW, RED)
+		);
+		pe3.direction = SOUTH.asVector();
+		pe3.randomness = .33;
+		pe3.angle = 30;
+
+		DrawableLayer drawables = new DrawableLayer();
+		addLayer(drawables);
+		drawables.add(pe1, pe2, pe3);
+
+		pe1.start();
+		pe2.start();
+		pe3.start();
+
+		r = new Rocket(200, 400);
+		drawables.add(r);
+		r.start();
+	}
+
+	@Override
+	public void update( double delta ) {
+		pe1.update(delta);
+		pe2.update(delta);
+		pe3.update(delta);
+		pe3.position.add(NORTH.asVector().scale(Constants.map(runtime, 0, 1000, 0, 10) * delta));
+
+		if( r.isActive() ) {
+			r.update(delta);
+		}
+	}
+
+	class Rocket extends PhysicsObject implements Drawable {
+
+		ParticleEmitter trail;
+
+		private boolean starting = false;
+
+		private double acc = 4;
+
+		public Rocket( double x, double y ) {
+			super(new Vector(x, y));
+			trail = new ParticleEmitter(
+				x, y, 30, 6,
+				new BasicParticleFactory(YELLOW, RED)
+			);
+			trail.direction = SOUTH.asVector();
+			trail.randomness = .33;
+			trail.angle = 30;
+			trail.position = this.position;
+		}
+
+		public void start() {
+			starting = true;
+			trail.start();
+		}
+
+		@Override
+		public boolean isActive() {
+			return starting;
+		}
+
+		@Override
+		public boolean isVisible() {
+			return true;
+		}
+
+		@Override
+		public void update( double delta ) {
+			super.update(delta);
+			if( this.acceleration.lengthSq() < acc * acc ) {
+				this.accelerate(NORTHWEST.asVector().scale(acc));
+			}
+
+			trail.update(delta);
+		}
+
+		@Override
+		public void draw( Graphics2D graphics ) {
+			graphics.rotate(-Constants.radians(velocity.angle() + 180), position.getIntX(), position.getIntY());
+			trail.draw(graphics);
+
+			graphics.setColor(WHITE.getJavaColor());
+			graphics.fillRect(position.getIntX() - 6, position.getIntY() - 32, 12, 32);
+			graphics.fillPolygon(
+				new int[]{position.getIntX() - 6, position.getIntX(), position.getIntX() + 6},
+				new int[]{position.getIntY() - 32, position.getIntY() - 40, position.getIntY() - 32},
+				3
+			);
+			graphics.rotate(Constants.radians(velocity.angle() + 180), position.getIntX(), position.getIntY());
+		}
+
+	}
+
+}