$useSDL = :useSDL
$useGL = :useGL

$standardCoords = :standardCoords
$integerCoords = :integerCoords

$screenWidth = 600
$screenHeight = 600
$coordinateSystem = $standardCoords

#useGL or useSDL
$graphicsSystem = $useGL

# set false to turn animation off (calls to redraw become manual)
# true turns animation on
$animate = true