ef_ring;
返回： N/A
This constant is for use in the functions effect_create_above and
effect_create_below, and
will create a ring effect as illustrated in the image below:
if mouse_check_button_pressed(mb_left)
{
effect_create_below(ef_ring, mouse_x, mouse_y, 1, c_aqua);
}
The above code will create a light blue ring effect below the mouse cursor when the left button is pressed.