Sorry, but I am not a PI expert. I just use it as a tool.
If someone else with more expertise does not answer your question,
I suggest you post to a PI hardware/software forum.
Thanks for the example this has been immensely helpful in seeing how VG handles basic geometric shapes.ajstarks wrote:See: https://gist.github.com/3186193 for an example program that draws random shapes on the Raspberry Pi: