drawTree = function(x1, y1, angle, depth)
	fork_angle = 20
	base_len = 9
	if depth > 0 then
		radians = angle * pi / 180
		x2 = x1 + cos(radians) * depth * base_len
		y2 = y1 + sin(radians) * depth * base_len
		gfx.line x1, y1, x2, y2, "#008000"
		drawTree x2, y2, angle - fork_angle, depth - 1
		drawTree x2, y2, angle + fork_angle, depth - 1
	end if
end function
clear
gfx.clear "#87CEEB"
drawTree 480, 10, 90, 11
img = gfx.getImage(0, 0, 960, 640)
file.saveImage "/usr/fractalTree.png", img