XPolygonRegion(3) XLIB FUNCTIONS XPolygonRegion(3)NAME
XPolygonRegion, XClipBox - generate regions
Region XPolygonRegion(XPoint points, int n, int fill_rule);
int XClipBox(Region r, XRectangle *rect_return);
fill_rule Specifies the fill-rule you want to set for the specified GC. You can pass EvenOddRule or WindingRule.
n Specifies the number of points in the polygon.
points Specifies an array of points.
r Specifies the region.
Returns the smallest enclosing rectangle.
The XPolygonRegion function returns a region for the polygon defined by the points array. For an explanation of fill_rule, see XCreateGC.
The XClipBox function returns the smallest rectangle enclosing the specified region.
SEE ALSO XCreateGC(3), XDrawPoint(3), XDrawRectangle(3)
Xlib - C Language X Interface
X Version 11 libX11 1.6.0 XPolygonRegion(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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