mirror of
https://github.com/jneug/zeichenmaschine.git
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129 lines
3.1 KiB
Java
129 lines
3.1 KiB
Java
import schule.ngb.zm.*;
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import java.util.List;
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public class Boid extends Creature {
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public static final double COHESION_FACTOR = .5;
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public static final double SEPARATION_FACTOR = .5;
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public static final double ALIGNMENT_FACTOR = .5;
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public static final double FLIGHT_FACTOR = .5;
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public static final double VELOCITY_LIMIT = 3.0;
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public static final double FORCE_LIMIT = .1;
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public static final int FLOCK_RADIUS = 100;
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public static final boolean SHOW_RADIUS = false;
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public static final int BOID_WIDTH = 8;
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public static final int BOID_HEIGHT = 16;
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private boolean highlight = false;
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public Boid() {
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// Generate random Boid
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super(
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Vector.random(BOID_WIDTH, width-BOID_WIDTH, BOID_HEIGHT, height-BOID_HEIGHT),
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Vector.random(-1, 1).scale(random(VELOCITY_LIMIT))
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);
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senseRange = FLOCK_RADIUS;
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}
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public Boid( Vector pos, Vector vel ) {
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super(pos, vel);
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senseRange = FLOCK_RADIUS;
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}
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public void toggleHighlight() {
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highlight = !highlight;
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}
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public void draw( DrawingLayer drawing ) {
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drawing.setFillColor(251, 241, 195);
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drawing.setStrokeColor(239, 191, 77);
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drawing.setStrokeWeight(2);
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drawing.pushMatrix();
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drawing.translate(position.x, position.y);
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drawing.rotate(90 + velocity.angle());
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drawing.triangle(BOID_WIDTH / -2.0, BOID_HEIGHT / 2.0, 0, BOID_HEIGHT / -2.0, BOID_WIDTH / 2.0, BOID_HEIGHT / 2.0);
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if( SHOW_RADIUS || highlight ) {
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drawing.setFillColor(251, 241, 195, 33);
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drawing.noStroke();
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drawing.circle(0, 0, FLOCK_RADIUS);
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}
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drawing.popMatrix();
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}
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public void update( List<Creature> creatures ) {
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Vector cohesion = new Vector();
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Vector separation = new Vector();
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Vector alignment = new Vector();
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Vector flight = new Vector();
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int boids = 0, predators = 0;
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for( Creature c: creatures ) {
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if( isInRange(c) ) {
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if( Predator.class.isInstance(c) ) {
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double distSq = position.distanceSq(c.getPosition());
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flight.add(Vector.sub(position, c.getPosition()).div(distSq));
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predators += 1;
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} else {
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cohesion.add(c.getPosition());
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alignment.add(c.getVelocity());
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double distSq = position.distanceSq(c.getPosition());
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separation.add(Vector.sub(position, c.getPosition()).div(distSq));
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boids += 1;
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}
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}
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}
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if( boids > 0 ) {
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// Cohesion
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cohesion.div(boids).sub(position);
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cohesion.setLength(VELOCITY_LIMIT).sub(velocity);
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cohesion.limit(FORCE_LIMIT);
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cohesion.scale(COHESION_FACTOR);
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// Separation
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separation.div(boids);
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separation.setLength(VELOCITY_LIMIT).sub(velocity);
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separation.limit(FORCE_LIMIT);
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separation.scale(SEPARATION_FACTOR);
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// Alignment
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alignment.div(boids);
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alignment.setLength(VELOCITY_LIMIT).sub(velocity);
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alignment.limit(FORCE_LIMIT);
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alignment.scale(ALIGNMENT_FACTOR);
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}
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if( predators > 0 ) {
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flight.div(predators);
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flight.setLength(VELOCITY_LIMIT).sub(velocity);
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flight.limit(FORCE_LIMIT*4.0);
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flight.scale(FLIGHT_FACTOR);
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}
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acceleration
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.scale(0.0)
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.add(separation)
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.add(cohesion)
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.add(alignment)
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.add(flight);
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position.add(velocity);
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limitPosition();
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velocity.add(acceleration).limit(VELOCITY_LIMIT);
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}
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}
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