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XPolygonRegion()					      XPolygonRegion()

Name
  XPolygonRegion – generate a region from points in a polygon.

Synopsis
  Region XPolygonRegion(points, n, fill_rule)
	XPoint points[];
	int n;
	int fill_rule;

Arguments
  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 Graph‐
	    ics Context, for a description of the fill rule.

Returns
  The created region.

Description
  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  origin
  can  be  coincident with the drawable origin.	 It is up to the applica‐
  tion 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
  values:

  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.

Structures
  Region is a pointer to an opaque structure type.

See Also
  XClipBox(),  XCreateRegion(), XDestroyRegion(), XEmptyRegion(), XEqual‐
  Region(), XIntersectRegion(), XOffsetRegion(), XPointInRegion(), XRect‐
  InRegion(),  XSetRegion(),  XShrinkRegion(), XSubtractRegion(), XUnion‐
  RectWithRegion(), XUnionRegion(), XXorRegion().

Xlib - Regions						      XPolygonRegion()

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