function main() returns nothing

number i = 0

number stepSizeH = 1 / getTurtleSpaceWidth()

number stepSizeV = 1 / getTurtleSpaceHeight()

number r = 0.0

number b = 0.0

disableFence()

hideTurtle()

turnRight(90)

for b = 0.0 to 1.0 step stepSizeV

setTurtleXY(0, i)

for r = 0.0 to 1.0 step stepSizeH

setPenColorRGB(r, 0.0, b)

goForward(1)

endfor

i = i + 1

endfor

endfunction