planets.js

function planets(x,y,d,m){
	this.m=m;
	this.px=x;
	this.py=y;
	this.d=d;
	this.vx=0;
	this.vy=0;
	this.fx=0;
	this.fy=0;
	this.col="#ff6a6a";
	this.attraction=function(other){
		var distance=dist(other.px,other.py,this.px,this.py);
		var f=0;
		if(dist!=0){
			f=(G*this.m*other.m)/(distance*distance);
		}
		var angle=atan2(other.py-this.py,other.px-this.px);
		this.fx+=f*cos(angle);
		this.fy+=f*sin(angle);
	};
	
	this.update = function(){
		this.vx+=(this.fx/this.m)*dt;
		this.vy+=(this.fy/this.m)*dt;

		this.px+=(this.vx*dt);
		this.py+=(this.vy*dt);

	};

	this.display = function(){
		strokeWeight(2);
		stroke(this.col);
		fill(this.col);
		ellipse(this.px,this.py,this.d,this.d);
	};

}