Man page - xpolygonregion(3)

Packages contains this manual

Package: libx11-doc
apt-get install libx11-doc

Documentations in package:

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.

rect_return

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.