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examples/zm_boids/Creature.java

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+import schule.ngb.zm.Constants;
+import schule.ngb.zm.DrawingLayer;
+import schule.ngb.zm.Vector;
+
+import java.util.List;
+
+public abstract class Creature extends Constants {
+
+	protected Vector position, velocity, acceleration;
+
+	protected int senseRange = 100;
+
+	public Creature( Vector pos, Vector vel ) {
+		position = pos.copy();
+		velocity = vel.copy();
+		acceleration = new Vector();
+	}
+
+	public Vector getPosition() {
+		return position;
+	}
+
+	public Vector getVelocity() {
+		return velocity;
+	}
+
+	public abstract void draw( DrawingLayer drawing );
+
+	public abstract void update( List<Creature> creatures );
+
+	protected void limitPosition() {
+		if( position.x < 0 ) {
+			if( Boids.BORDER_WRAP ) {
+				position.x = width;
+			} else {
+				position.x = 0;
+				//velocity.mult(-1);
+				acceleration.add(Vector.scale(velocity, -2));
+			}
+		} else if( position.x > width ) {
+			if( Boids.BORDER_WRAP ) {
+				position.x = 0;
+			} else {
+				position.x = width;
+				//velocity.mult(-1);
+				acceleration.add(Vector.scale(velocity, -2));
+			}
+		}
+		if( position.y < 0 ) {
+			if( Boids.BORDER_WRAP ) {
+				position.y = height;
+			} else {
+				position.y = 0;
+				//velocity.mult(-1);
+				acceleration.add(Vector.scale(velocity, -2));
+			}
+		} else if( position.y > height ) {
+			if( Boids.BORDER_WRAP ) {
+				position.y = 0.0;
+			} else {
+				position.y = height;
+				//velocity.mult(-1);
+				acceleration.add(Vector.scale(velocity, -2));
+			}
+		}
+	}
+
+	protected boolean isInRange( Creature otherCreature ) {
+		if( otherCreature == this || otherCreature == null ) {
+			return false;
+		}
+		if( abs(position.x-otherCreature.getPosition().x) > senseRange  ) {
+			return false;
+		}
+		return position.distanceSq(otherCreature.getPosition()) < senseRange*senseRange;
+	}
+}