circulo insecto

float posY, diam, posX;
void setup(){
size(1080,720);
diam = 50;
posY = 0-diam;
posX = width/2;
}
void draw(){
  posY+=random(5);
  posX+=random(4);
//  background(0);
  ellipse(posX,posY,diam,diam);
  if (posY>height+diam){
  posY=0-diam;
  }
  if (posX>width+diam){
   posX= 0 - diam;
  }
 
}