gistfile1.txt

ex = room_width / 2
why = room_height / 2

for (exx = 0; ex < room_width; exx += 1) {
    for (whyy = 0; whyy < room_height; whyy += 1) {
        draw_point_color(exx, whyy, make_color_hsv(0, 0, sqrt(((exx - ex) ^ 2) + ((whyy - why) ^ 2)) * (255 / (room_height/2))))
    }
}