The GtkRadiant sources as originally released under the GPL license.

contrib/bobtoolz/DWinding.h

@@ -0,0 +1,68 @@
+/*
+BobToolz plugin for GtkRadiant
+Copyright (C) 2001 Gordon Biggans
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+// DWinding.h: interface for the DWinding class.
+//
+//////////////////////////////////////////////////////////////////////
+
+#if !defined(AFX_DWINDING_H__35B2C524_F0A7_11D4_ACF7_004095A18133__INCLUDED_)
+#define AFX_DWINDING_H__35B2C524_F0A7_11D4_ACF7_004095A18133__INCLUDED_
+
+#if _MSC_VER > 1000
+#pragma once
+#endif // _MSC_VER > 1000
+
+class DPlane;
+
+class DWinding  
+{
+public:
+	DWinding();
+	virtual ~DWinding();
+
+	void AllocWinding(int points);
+
+	bool ChopWinding(DPlane* chopPlane);
+	bool ChopWindingInPlace(DPlane* chopPlane, vec_t ON_EPSILON);
+	void ClipWindingEpsilon(DPlane* chopPlane, vec_t epsilon, DWinding** front, DWinding** back);
+
+	void CheckWinding();
+	void WindingCentre(vec3_t centre);
+	void WindingBounds(vec3_t mins, vec3_t maxs);
+	void RemoveColinearPoints();
+
+	DWinding* ReverseWinding();
+	DWinding* CopyWinding();
+	DPlane* WindingPlane();
+
+	int WindingOnPlaneSide(vec3_t normal, vec_t dist);
+
+	vec_t WindingArea();
+
+//	members
+	int		numpoints;
+	vec3_t*	p;
+  vec3_t  clr;
+};
+
+#define	MAX_POINTS_ON_WINDING	64
+
+#define	ON_EPSILON	0.01
+
+#endif // !defined(AFX_DWINDING_H__35B2C524_F0A7_11D4_ACF7_004095A18133__INCLUDED_)