XCreateRegion(3) XLIB FUNCTIONS XCreateRegion(3)NAME
XCreateRegion, XSetRegion, XDestroyRegion - create or destroy regions
int XSetRegion(Display *display, GC gc, Region r);
int XDestroyRegion(Region r);
display Specifies the connection to the X server.
gc Specifies the GC.
r Specifies the region.
The XCreateRegion function creates a new empty region.
The XSetRegion function sets the clip-mask in the GC to the specified region. The region is specified relative to the drawable's origin.
The resulting GC clip origin is implementation-dependent. Once it is set in the GC, the region can be destroyed.
The XDestroyRegion function deallocates the storage associated with a specified region.
SEE ALSO XEmptyRegion(3), XIntersectRegion(3)
Xlib - C Language X Interface
X Version 11 libX11 1.6.0 XCreateRegion(3)
Check Out this Related Man Page
XPolygonRegion - generate a region from points in a polygon.
Region XPolygonRegion(points, n, fill_rule)
points Specifies a pointer to an array of points.
n Specifies the number of points in the polygon.
fill_rule Specifies whether areas overlapping an odd number of times should be part of the region (WindingRule) or not part of the region
(EvenOddRule). See Volume One, Chapter 5, The Graphics Context, for a description of the fill rule.
The created region.
XPolygonRegion() creates a region defined by connecting the specified points, and returns a pointer to be used to refer to the region.
Regions are located relative to a point (the region origin) which is common to all regions. In XPolygonRegion(), the coordinates specified
in points are relative to the region origin. By specifying all points relative to the drawable in which they will be used, the region ori-
gin can be coincident with the drawable origin. It is up to the application whether to interpret the location of the region relative to a
drawable or not.
If the region is to be used as a clip_mask by calling XSetRegion(), the upper-left corner of the region relative to the drawable used in
the graphics request will be at (xoffset + clip_x_origin, yoffset + clip_y_origin), where xoffset and yoffset are the offset of the region
(if any) and clip_x_origin and clip_y_origin are elements of the GC used in the graphics request. The fill_rule can be either of these
EvenOddRule Areas overlapping an odd number of times are not part of the region.
WindingRule Overlapping areas are always filled.
For more information on structures, see Volume One, Chapter 6, Drawing Graphics and Text.
Region is a pointer to an opaque structure type.
XClipBox(), XCreateRegion(), XDestroyRegion(), XEmptyRegion(), XEqualRegion(), XIntersectRegion(), XOffsetRegion(), XPointInRegion(),
XRectInRegion(), XSetRegion(), XShrinkRegion(), XSubtractRegion(), XUnionRectWithRegion(), XUnionRegion(), XXorRegion().
Xlib - Regions XPolygonRegion()
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