A base for Game monad.
Combined picture from some pictures.
Rotated picture by the given angle (in degrees, counterclockwise).
A picture translated by the given coordinate.
Finalize the current frame and refresh the screen.
Create a Picture from Bitmap.
Is the specified Key is pressed?
Embed arbitrary IO actions into a Game monad.
Run a Game monad in a Game monad. resources (e.g. pictures) will be released when inner computation is done.