class Thingy
{
	private PVector last_loc;
	public PVector loc;
	public PVector acc;
	public PVector vel;
	public float mass;
	
	public boolean dead = false;
	
	float grayscale = 0;
	float age = 0;
	
	Thingy()
	{
		this.acc = new PVector(0,0);
		this.vel = new PVector(0,0);
		this.loc = new PVector(0,0);
		this.last_loc = new PVector(0,0);
		this.mass = 0;
	}
	
	
	Thingy(PVector initial_loc)
	{
		
		this.acc = new PVector(0,0);
		this.vel = new PVector(0,0);
		this.loc = initial_loc.get();
		this.last_loc = initial_loc.get();
		this.mass = random(0,1) * 1000 + 700;
		//println("mass:" + this.mass);
		this.grayscale = 255;//map(random(1,5),1,5,0,255);
		
	}
	
	public void die()
	{
		dead = true;
	}
	
	public void live()
	{
		dead = false;
		age = 0;
	}
	
	void applyForce(PVector force)
	{
		force.div(this.mass);
		this.acc.add(force);
	}
	
	void update()
	{
		if (this.loc.x > width || this.loc.x < 0 || this.loc.y > height || this.loc.y < 0)
		{
			die();
		}
		else
		{
			this.vel.add(this.acc);
			this.loc.add(this.vel);

			this.vel.mult(0.95);
			this.age++;
		}

		
		
	}
	
	void display()
	{
		if (!dead)
		{
			strokeWeight( constrain(map(this.loc.z,-1,8,0.5,0.8),0,1.2));
			stroke(map(this.loc.z,-1,200,10,255));//
			noFill();
			
			float side = constrain(map(this.loc.z,-1,3,2,4),2,4);
			line(this.loc.x - side,this.loc.y,this.loc.x + side,this.loc.y);
			line(this.loc.x,this.loc.y - side,this.loc.x,this.loc.y + side);
			this.last_loc = this.loc.get();

			this.acc.mult(0);
		}
	}
	
}