Particle_extention.java

public class BoxParticle extends Particle {

    int color;
    int size;

    public BoxParticle(PVector location, int color, int size) {
        super(location);
        this.color = color;
        this.size = size;
    }

    //overrides Particle's render()
    public void render() {
        fill(color);
        rect(getLoc().x, getLoc().y, size, size);
    }
 

}