VEraseOverlayPoints
Name
VEraseOverlayPoints - erases 1-bit overlay points.
Synopsis
VEraseOverlayPoints(win, ovl, points, npoints)
Window win;
int ovl;
XPoint *points;
int npoints;
Description
VEraseOverlayPoints erases 1-bit overlay points (pixels), in the image
window or one of its subwindows.
Return Value
0 - work successfully.
1 - memory allocation error.
6 - invalid window ID.
225 - no overlay created.
237 - the overlay is not on.
Parameters
win - the image window ID or one of its subwindows' ID.
ovl - specifies the overlay number to be used to erase the points.
points - specifies a pointer to an array of XPoint structures containing
the positions of the points.
npoints - specifies the number of points to be erased.
Side Effects
None.
Entry Conditions
If ovl or npoint is not valid, or points is NULL, or VCreateColormap is
not called earlier, VEraseOverlayPoints prints an error message to the
standard error stream, produces a core dump file and exits from the current
process.
Related Functions
VDisplayOverlayPoints,
VEraseOverlay.
VTurnOffOverlay.