Processing:Particle Class

Particle.pde

class Node  {

	private PVector vel;
	private PVector loc;
	private PVector acc;

	Node () {

		vel = PVector.random2D();
		loc = new PVector(random(width), random(height));
		acc = PVector.random2D();

		
	}

	void update(){

		vel.add(acc);
		loc.add(vel);
		acc.mult(0);

	}

	void applyForce(PVector force){

		acc.add(force);

	}

	void checkEdges(){

 		if (loc.x >= width || loc.x <= 0) {
 		  vel.x *=-1;
 		} 

 		if (loc.y > height || loc.y < 0) {
 		  vel.y *=-1;
 		}

	}

	void draw(){

		strokeWeight(10);
		stroke(0);
		point(loc.x, loc.y);

	}

}