DrawArea.rotate

void rotate(double angle, int bgColor = 0xffffff, double cx = -1, double cy = -1, int filter = LinearFilter, double blur = 1);

Argument	Default	Description
angle	(Mandatory)	The rotation angle measured clockwise in degrees.
bgColor	FFFFFF	The background color used to fill the space left after rotation.
cx	-1	The x coordinate of the center of rotation. -1 means rotating about the center of the drawing surface.
cy	-1	The y coordinate of the center of rotation. -1 means rotating about the center of the drawing surface.
filter	LinearFilter	The filter to use for re-sampling.
blur	1	The blur factor to use for re-sampling.