void setup () {

size(200, 200);
smooth();

}

void draw () {

background(204);  
  
float a = alfa (mouseX-20, 100-mouseY);
float b = beta (mouseX-20, 100-mouseY);

translate (20, 100);

rotate (PI/4);
rotate (a);
line (0,0,0,-46);
translate (0,-46);
rotate (PI/2);
rotate (b);
line (0,0,0,-73);


}