#define DRAW_OPT_LOGICAL_XOR   (0x0018)

Draw pixels using a logical XOR operation

Examples:

ex_CircleOut.nxc, ex_EllipseOut.nxc, ex_LineOut.nxc, ex_PolyOut.nxc, ex_SysDrawEllipse.nxc, and ex_sysdrawpolygon.nxc.