void setup() {
  size(200,200); 
    background(255);
}


void draw() {

  float x = mouseX; 
  float y = mouseY; 
  line(x, y, x+20, y-40); 
  line(x+20, y, x+40, y-40); 
  line(x+20, y, x+40, y-40); 
}