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csgeom/poly2d.h

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00001 /*
00002     Copyright (C) 1998,2000 by Jorrit Tyberghein
00003 
00004     This library is free software; you can redistribute it and/or
00005     modify it under the terms of the GNU Library General Public
00006     License as published by the Free Software Foundation; either
00007     version 2 of the License, or (at your option) any later version.
00008 
00009     This library is distributed in the hope that it will be useful,
00010     but WITHOUT ANY WARRANTY; without even the implied warranty of
00011     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012     Library General Public License for more details.
00013 
00014     You should have received a copy of the GNU Library General Public
00015     License along with this library; if not, write to the Free
00016     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00017 */
00018 
00019 #ifndef __CS_POLY2D_H__
00020 #define __CS_POLY2D_H__
00021 
00028 #include "csextern.h"
00029 
00030 #include "csgeom/math2d.h"
00031 #include "csgeom/box.h"
00032 
00033 struct iClipper2D;
00034 
00039 class CS_CSGEOM_EXPORT csPoly2D
00040 {
00041 protected:
00043   csVector2* vertices;
00045   int num_vertices;
00047   int max_vertices;
00048 
00050   csBox2 bbox;
00051 
00052 public:
00056   csPoly2D (int start_size = 10);
00057 
00059   csPoly2D (const csPoly2D& copy);
00060 
00062   virtual ~csPoly2D ();
00063 
00065   csPoly2D& operator= (const csPoly2D& other);
00066 
00070   void MakeEmpty ();
00071 
00075   int GetVertexCount () { return num_vertices; }
00076 
00080   int GetVertexCount () const { return num_vertices; }
00081 
00085   csVector2* GetVertices () { return vertices; }
00086 
00090   const csVector2* GetVertices () const { return vertices; }
00091 
00095   csVector2* GetVertex (int i)
00096   {
00097     if (i<0 || i>=num_vertices) return 0;
00098     return &vertices[i];
00099   }
00100 
00104   csVector2& operator[] (int i)
00105   {
00106     CS_ASSERT (i >= 0 && i < num_vertices);
00107     return vertices[i];
00108   }
00109 
00113   const csVector2& operator[] (int i) const
00114   {
00115     CS_ASSERT (i >= 0 && i < num_vertices);
00116     return vertices[i];
00117   }
00118 
00122   csVector2* GetFirst ()
00123   { if (num_vertices<=0) return 0;  else return vertices; }
00124 
00128   csVector2* GetLast ()
00129   { if (num_vertices<=0) return 0;  else return &vertices[num_vertices-1]; }
00130 
00134   bool In (const csVector2& v);
00135 
00139   static bool In (csVector2* poly, int num_poly, const csVector2& v);
00140 
00144   void MakeRoom (int new_max);
00145 
00149   void SetVertexCount (int n)
00150   {
00151     MakeRoom (n);
00152     num_vertices = n;
00153   }
00154 
00159   int AddVertex (const csVector2& v) { return AddVertex (v.x, v.y); }
00160 
00165   int AddVertex (float x, float y);
00166 
00171   void SetVertices (csVector2 const* v, int num)
00172   { MakeRoom (num); memcpy (vertices, v, (num_vertices = num) * sizeof (csVector2)); }
00173 
00175   void UpdateBoundingBox ();
00176 
00178   csBox2& GetBoundingBox () { return bbox; }
00179 
00188   bool ClipAgainst (iClipper2D* view);
00189 
00198   void Intersect (const csPlane2& plane, csPoly2D& left, csPoly2D& right) const;
00199 
00204   void ClipPlane (const csPlane2& plane, csPoly2D& right) const;
00205 
00214   void ExtendConvex (const csPoly2D& other, int this_edge);
00215 
00219   float GetSignedArea();
00220 
00226   void Random (int num, const csBox2& max_bbox);
00227 };
00228 
00234 class csPoly2DFactory
00235 {
00236 public:
00238    CS_DECLARE_STATIC_CLASSVAR(sharedFactory,SharedFactory,csPoly2DFactory)
00239 
00240   
00241   virtual csPoly2D* Create () { csPoly2D* p = new csPoly2D (); return p; }
00242 };
00243 
00246 #endif // __CS_POLY2D_H__

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