JavaScript Routines Part 1: CIRCLES!

1. function Circle(ctx,x,y,r,fillStyle){
2.      // x = top corner X      y = top corner Y
3.      // r = radius            ctx = canvas context
4.      ctx.fillStyle = (typeof fillStyle === "undefined") ? "rgb(0,0,0)" : fillStyle;
5.      ctx.beginPath();
6.      ctx.arc(x+r,y+r,r,0,Math.PI*2,true);
7.      ctx.stroke();
8. }