XIntersectRegion(XS)     X Version 11 (Release 5)       XIntersectRegion(XS)
                                6 January 1993


 Name

    XIntersectRegion - 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


    destregionreturn
               Returns the destination region.

    drreturn  Returns the result of the computation.

    dx
    dy         Specify the x and y coordinates, which define the amount you
               want to move or shrink 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.

    srcregion 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 drreturn.

    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(XS), XDrawRectangle(XS), XEmptyRegion(XS)
    Xlib - C Language X Interface