int i;
int j;
int direction;

void setup (){

  size(300,300);
  direction=1;
}

void loop(){
 background(255,255,255);
  i = i+direction;
  j=  j+direction;
 // fill(j,150.0);
 //ellipse (290-i,j,mouseX,mouseY);//migiue
 // fill(j,0,150);
 
    ellipse (mouseY,30,30,30);
    fill(150,0,66);

 // ellipse (mouseX,30,i,mouseY);
//  fill(150,j,150);
  //
 // ellipse (290-i,j,mouseX,mouseY);//migiue
 // fill(j,0,150);
  if(i > 300-30){
    direction= -1;
  }
  if(i < 0){
    direction= 1;
  }
}