Spirograph Circle Drawer Thing

float rad,a=0,x,y,x1,y1,i=10,x2,y2,g=0;

​

void setup(){

  size(625,625);

  rad=(height/4)-2;

  x2=cos(radians((i-1)*a))*(rad);

  y2=sin(radians((i-1)*a))*(rad);

  background(0);

  strokeJoin(ROUND);

}

​

void draw(){

  noFill();

  strokeWeight(2);

  stroke(225);

  translate(width/2,height/2);

  ellipse(0,0,height-4,height-4);

  x=cos(radians(a))*rad;

  y=sin(radians(a))*rad;

  translate(x,y);

  x1=cos(radians((i-1)*a))*(rad);

  y1=sin(radians((i-1)*a))*(rad);

  line(x1,y1,x2,y2);

  x2=x1;

  y2=y1;

  if(a==390){

    background(0);

    i+=2;             //you can do i++ but odd numbers for i don't look as good

    a=0;

    x2=cos(radians((i-1)*a))*(rad);

    y2=sin(radians((i-1)*a))*(rad);

  }

  a+=.125;

  g++;

}