xunionrectwithregion(3) [hpux man page]

XUnionRectWithRegion()													    XUnionRectWithRegion()

Name
  XUnionRectWithRegion - add a rectangle to a region.

Synopsis
  XUnionRectWithRegion(rectangle, src_region, dest_region_return)
	  XRectangle *rectangle;
	  Region src_region;
	  Region dest_region_return;

Arguments
  rectangle Specifies the rectangle to add to the region.

  src_region
	    Specifies the source region to be used.

  dest_region_return
	    Specifies the resulting region.  May be the same as src_region.

Description
  XUnionRectWithRegion() computes the destination region from a union of the specified rectangle and the specified source region.  The source
  and destination regions may be the same.

  One common application of this function is to simplify the combining of the  rectangles  specified  in  contiguous  Expose  events  into  a
  clip_mask  in the GC, thus restricting the redrawn areas to the exposed rectangles.  Use XUnionRectWithRegion() to combine the rectangle in
  each Expose event into a region, then call XSetRegion().  XSetRegion() sets the clip_mask in a GC to the region.  In this case,  src_region
  and dest_region_return would be the same region.

  If  src_region  and dest_region_return are not the same region, src_region is copied to dest_region_return before the rectangle is added to
  dest_region_return.

  For more information on regions, see Volume One, Chapter 6, Drawing Graphics and Text.

Structures
     typedef struct {
	 short x, y;
	 unsigned short width, height;
     } XRectangle;

  Region is a pointer to an opaque data type.

See Also
  XClipBox(), XDestroyRegion(), XEmptyRegion(),  XEqualRegion(),  XIntersectRegion(),  XOffsetRegion(),  XPointInRegion(),  XPolygonRegion(),
  XRectInRegion(), XSetRegion(), XShrinkRegion(), XSubtractRegion(), XUnionRegion(), XXorRegion().

Xlib - Resource Manager 												    XUnionRectWithRegion()

XIntersectRegion(3X11)						  XLIB FUNCTIONS					    XIntersectRegion(3X11)

NAME

       XIntersectRegion, XUnionRegion, XUnionRectWithRegion, XSubtractRegion, XXorRegion, XOffsetRegion, XShrinkRegion - region arithmetic

SYNTAX

       XIntersectRegion(sra, srb, dr_return)
	     Region sra, srb, dr_return;

       XUnionRegion(sra, srb, dr_return)
	     Region sra, srb, dr_return;

       XUnionRectWithRegion(rectangle, src_region, dest_region_return)
	    XRectangle *rectangle;
	    Region src_region;
	    Region dest_region_return;

       XSubtractRegion(sra, srb, dr_return)
	     Region sra, srb, dr_return;

       XXorRegion(sra, srb, dr_return)
	     Region sra, srb, dr_return;

       XOffsetRegion(r, dx, dy)
	     Region r;
	     int dx, dy;

       XShrinkRegion(r, dx, dy)
	     Region r;
	     int dx, dy;

ARGUMENTS

       dest_region_return
		 Returns the destination region.

       dr_return Returns the result of the computation.  ds Dy move or shrink

       dx
       dy	 Specify the x and y coordinates, which define the amount you want to  the specified region.

       r	 Specifies the region.

       rectangle Specifies the rectangle.

       sra
       srb	 Specify the two regions with which you want to perform the computation.

       src_region
		 Specifies the source region to be used.

DESCRIPTION

       The XIntersectRegion function computes the intersection of two regions.

       The XUnionRegion function computes the union of two regions.

       The XUnionRectWithRegion function updates the destination region from a union of the specified rectangle and the specified source region.

       The XSubtractRegion function subtracts srb from sra and stores the results in dr_return.

       The XXorRegion function calculates the difference between the union and intersection of two regions.

       The XOffsetRegion function moves the specified region by a specified amount.

       The XShrinkRegion function reduces the specified region by a specified amount.  Positive values shrink the size of the region, and negative
       values expand the region.

SEE ALSO

       XCreateRegion(3X11), XDrawRectangle(3X11), XEmptyRegion(3X11)
       Xlib - C Language X Interface

X Version 11							    Release 6.6 					    XIntersectRegion(3X11)