X Version 11 (Release 6.1)

XEmptyRegion(X3xlib)

XEmptyRegion -- determine if regions are empty or equal

Synopsis

   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 XEmptyRegion function returns True if the region is empty.

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

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

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

References

XCreateRegion(X3xlib), XIntersectRegion(X3xlib)
Xlib - C Language X Interface