( resource psdoc, float x, float y, float width, float height )
Draws a rectangle with its lower left corner at (x,
y). The rectangle starts and ends in its lower left
corner. If this function is called outside a path it will start a new path.
If it is called within a path it will add the rectangle as a subpath. If
the last drawing operation does not end in the lower left corner then there
will be a gap in the path.