processing

 
void setup() {
  size(360, 360);
  background(110);
  color(190);
  
}

void draw() {

  Ellipse(mouseX, mouseY, mouseX, mouseY);
  color (590);
}




void Ellipse(int x, int y, int px, int py) {
  float speed = abs(x+px) + abs(y-py);
  stroke(mouseY);
  ellipse(y, x, speed, speed);
  color(250);
}