Ultra-SiMPLE
xr = xpixels()
yb = ypixels()
xc = xpixels()/2
yc = ypixels()/2
solid color (4)
solid rectangle (0, 0, xc, yb)
solid color (2)
solid rectangle (xc, 0, xr, yb)
solid color (1)
solid circle (xc, yc, 275)