r -= rspeed;
ang += angspeed;
if (r <= 0.5)
    instance_destroy();
x = centerx + lengthdir_x(r, ang);
y = centery + lengthdir_y(r, ang);
if (collision_rectangle(bbox_left, bbox_top, bbox_right, bbox_bottom, obj_heart, 0, 1))
    event_user(0);