ultrix man page for xpointinregion

XEmptyRegion(3X11)						     MIT X11R4							XEmptyRegion(3X11)

Name
       XEmptyRegion, XEqualRegion, XPointInRegion, XRectInRegion - determine if regions are empty or equal

Syntax
       Bool XEmptyRegion(r)
	  Region r;

       Bool XEqualRegion(r1, r2)
	  Region r1, r2;

       Bool XPointInRegion(r, x, y)
	  Region r;
	  int x, y;

       int XRectInRegion(r, x, y, width, height)
	  Region r;
	  int x, y;
	  unsigned int width, height;

Arguments
       r	 Specifies the region.

       r1
       r2	 Specify the two regions.

       width
       height	 Specify the width and height, which define the rectangle.

       x
       y	 Specify the x and y coordinates, which define the point or the coordinates of the upper-left corner of the rectangle.

Description
       The function returns if the region is empty.

       The function returns if the two regions have the same offset, size, and shape.

       The function returns if the point (x, y) is contained in the region r.

       The function returns if the rectangle is entirely in the specified region, if the rectangle is entirely out of the specified region, and if
       the rectangle is partially in the specified region.

See Also
       XCreateRegion(3X11), XIntersectRegion(3X11)
       X Window System: The Complete Reference, Second Edition, Robert W. Scheifler and James Gettys

																XEmptyRegion(3X11)