Index: polygon.h
===================================================================
--- polygon.h	(nonexistent)
+++ polygon.h	(revision 4)
@@ -0,0 +1,92 @@
+/*
+ *                            COPYRIGHT
+ *
+ *  PCB, interactive printed circuit board design
+ *  Copyright (C) 1994,1995,1996 Thomas Nau
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *  Contact addresses for paper mail and Email:
+ *  Thomas Nau, Schlehenweg 15, 88471 Baustetten, Germany
+ *  Thomas.Nau@rz.uni-ulm.de
+ *
+ *  RCS: $Id$
+ */
+
+/* prototypes for polygon editing routines
+ */
+
+#ifndef	PCB_POLYGON_H
+#define	PCH_POLYGON_H
+
+#include "global.h"
+
+/* Implementation constants */
+
+#define POLY_CIRC_SEGS 40
+#define POLY_CIRC_SEGS_F ((float)POLY_CIRC_SEGS)
+
+/* adjustment to make the segments outline the circle rather than connect
+ * points on the circle: 1 - cos (\alpha / 2) < (\alpha / 2) ^ 2 / 2
+ */
+#define POLY_CIRC_RADIUS_ADJ (1.0 + M_PI / POLY_CIRC_SEGS_F * \
+                                    M_PI / POLY_CIRC_SEGS_F / 2.0)
+
+/* polygon diverges from modelled arc no more than MAX_ARC_DEVIATION * thick */
+#define POLY_ARC_MAX_DEVIATION 0.02
+
+/* Prototypes */
+
+void polygon_init (void);
+Cardinal polygon_point_idx (PolygonTypePtr polygon, PointTypePtr point);
+Cardinal polygon_point_contour (PolygonTypePtr polygon, Cardinal point);
+Cardinal prev_contour_point (PolygonTypePtr polygon, Cardinal point);
+Cardinal next_contour_point (PolygonTypePtr polygon, Cardinal point);
+Cardinal GetLowestDistancePolygonPoint (PolygonTypePtr,
+					Coord, Coord);
+bool RemoveExcessPolygonPoints (LayerTypePtr, PolygonTypePtr);
+void GoToPreviousPoint (void);
+void ClosePolygon (void);
+void CopyAttachedPolygonToLayer (void);
+int PolygonHoles (PolygonType *ptr, const BoxType *range,
+		  int (*callback) (PLINE *, void *user_data),
+                  void *user_data);
+int PlowsPolygon (DataType *, int, void *, void *,
+		  int (*callback) (DataTypePtr, LayerTypePtr, PolygonTypePtr, int, void *, void *));
+void ComputeNoHoles (PolygonType *poly);
+POLYAREA * ContourToPoly (PLINE *);
+POLYAREA * PolygonToPoly (PolygonType *);
+POLYAREA * RectPoly (Coord x1, Coord x2, Coord y1, Coord y2);
+POLYAREA * CirclePoly (Coord x, Coord y, Coord radius);
+POLYAREA * OctagonPoly(Coord x, Coord y, Coord radius);
+POLYAREA * LinePoly(LineType *l, Coord thick);
+POLYAREA * ArcPoly(ArcType *l, Coord thick);
+POLYAREA * PinPoly(PinType *l, Coord thick, Coord clear);
+POLYAREA * BoxPolyBloated (BoxType *box, Coord radius);
+void frac_circle (PLINE *, Coord, Coord, Vector, int);
+int InitClip(DataType *d, LayerType *l, PolygonType *p);
+void RestoreToPolygon(DataType *, int, void *, void *);
+void ClearFromPolygon(DataType *, int, void *, void *);
+
+bool IsPointInPolygon (Coord, Coord, Coord, PolygonTypePtr);
+bool IsPointInPolygonIgnoreHoles (Coord, Coord, PolygonTypePtr);
+bool IsRectangleInPolygon (Coord, Coord, Coord, Coord, PolygonTypePtr);
+bool isects (POLYAREA *, PolygonTypePtr, bool);
+bool MorphPolygon (LayerTypePtr, PolygonTypePtr);
+void NoHolesPolygonDicer (PolygonType *p, const BoxType *clip,
+                          void (*emit) (PLINE *, void *), void *user_data);
+void PolyToPolygonsOnLayer (DataType *, LayerType *, POLYAREA *, FlagType);
+
+#endif