Sets the current logical mode for line drawing.
#include <graph.h>
short __far _setwritemode( short action );
| action | Interaction with existing screen image |
The _setwritemode function sets the current logical write mode, which is used when drawing lines with the _lineto, _polygon, and _rectangle functions.
The action argument defines the write mode. The possible values are _GAND, _GOR, _GPRESET, _GPSET, and _GXOR. See the description of the _putimage functions for more details on these manifest constants.
The _setwritemode function returns the previous write mode, or –1 if an error occurs.
Standards:None
16-Bit:DOS
32-Bit:None
_getwritemode, _grstatus, _lineto functions, _polygon functions, _putimage functions, _rectangle functions, _setcolor, _setlinestyle
See the example for _getwritemode.