aho_07_setuploop.pde

float x,y,a;

void setup() {
   size(300,300);
   ellipseMode(CENTER_DIAMETER);
   
   a=0;
 }


void loop() {
   background(100);
   
   x=cos(radians(a))*100+width/2;
   y=sin(radians(a))*100+height/2;
   ellipse(x,y, 20,20);
   
   a=a+2;
}