I'm trying to draw something, but it doesn't show up

[Andrew McCarthy]

I'm in a java class at my college, and for the lab I had to come up with a code that would make a spirograph (technically an epicycloid). But the code I came up with just opens a blank screen. Can anyone tell me what it needs in order to show the lines? (If you go to Wikipedia and look up epicycloid, there will be an example of what I'm trying to do)

public class Spirograph {

    public static void main(String[] args) {
    	double R = Double.parseDouble(args[0]);
    	double r = Double.parseDouble(args[1]);
    	double a = Double.parseDouble(args[2]);
    	double t = 0.0;
    	while(t < 100) {
    		double x = (R+r) * Math.cos(t) - (r+a) * Math.cos(((R+r)/r)*t);
    		double y = (R+r) * Math.sin(t) - (r+a) * Math.sin(((R+r)/r)*t);
    		StdDraw.setXscale(-300, +300);
    		StdDraw.setYscale(-300, +300);
    		StdDraw.show(20);
    	}
    }
}

[Paul Clapham]

That entirely depends on how your StdDraw class works. It isn't part of the standard Java API, so you can't really expect people to know about it.

[Andrew McCarthy]

Ah, I see. Alright, thank you very much.

[Paul Clapham]

Not that you shouldn't post a question about it... I meant that you should post the code for that class, or if you don't have that then you should post the specs for the methods, or something like that.