DouKaku?

#include "d3m.hsp"
    
    xs = -1, 1, 1,-1
    ys = -1,-1, 1, 1
    
    repeat
        redraw 0
        color 255, 255, 255 : boxf
        d3setcam 1500, 0, 500
        color
        d3initlineto
        rad = 0.05 * cnt
        repeat 5
            x = xs(cnt\4) * 500
            y = ys(cnt\4) * 500
            d3rotate x, y, x, y, rad
            d3lineto x, y, 0
            d3line x, y, 0, 0, 0, 700
            d3line x, y, 0, 0, 0, -700
        loop
        redraw
        await 40
    loop