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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 "csgeom/math2d.h"
00029 #include "csgeom/box.h"
00030 
00031 struct iClipper2D;
00032 
00037 class csPoly2D
00038 {
00039 protected:
00041   csVector2* vertices;
00043   int num_vertices;
00045   int max_vertices;
00046 
00048   csBox2 bbox;
00049 
00050 public:
00054   csPoly2D (int start_size = 10);
00055 
00057   csPoly2D (const csPoly2D& copy);
00058 
00060   virtual ~csPoly2D ();
00061 
00063   csPoly2D& operator= (const csPoly2D& other);
00064 
00068   void MakeEmpty ();
00069 
00073   int GetVertexCount () { return num_vertices; }
00074 
00078   int GetVertexCount () const { return num_vertices; }
00079 
00083   csVector2* GetVertices () { return vertices; }
00084 
00088   const csVector2* GetVertices () const { return vertices; }
00089 
00093   csVector2* GetVertex (int i)
00094   {
00095     if (i<0 || i>=num_vertices) return 0;
00096     return &vertices[i];
00097   }
00098 
00102   csVector2& operator[] (int i)
00103   {
00104     CS_ASSERT (i >= 0 && i < num_vertices);
00105     return vertices[i];
00106   }
00107 
00111   const csVector2& operator[] (int i) const
00112   {
00113     CS_ASSERT (i >= 0 && i < num_vertices);
00114     return vertices[i];
00115   }
00116 
00120   csVector2* GetFirst ()
00121   { if (num_vertices<=0) return 0;  else return vertices; }
00122 
00126   csVector2* GetLast ()
00127   { if (num_vertices<=0) return 0;  else return &vertices[num_vertices-1]; }
00128 
00132   bool In (const csVector2& v);
00133 
00137   static bool In (csVector2* poly, int num_poly, const csVector2& v);
00138 
00142   void MakeRoom (int new_max);
00143 
00147   void SetVertexCount (int n)
00148   {
00149     MakeRoom (n);
00150     num_vertices = n;
00151   }
00152 
00157   int AddVertex (const csVector2& v) { return AddVertex (v.x, v.y); }
00158 
00163   int AddVertex (float x, float y);
00164 
00169   void SetVertices (csVector2 const* v, int num)
00170   { MakeRoom (num); memcpy (vertices, v, (num_vertices = num) * sizeof (csVector2)); }
00171 
00173   void UpdateBoundingBox ();
00174 
00176   csBox2& GetBoundingBox () { return bbox; }
00177 
00186   bool ClipAgainst (iClipper2D* view);
00187 
00196   void Intersect (const csPlane2& plane, csPoly2D& left, csPoly2D& right) const;
00197 
00202   void ClipPlane (const csPlane2& plane, csPoly2D& right) const;
00203 
00212   void ExtendConvex (const csPoly2D& other, int this_edge);
00213 
00217   float GetSignedArea();
00218 
00224   void Random (int num, const csBox2& max_bbox);
00225 };
00226 
00232 class csPoly2DFactory
00233 {
00234 public:
00236    CS_DECLARE_STATIC_CLASSVAR(sharedFactory,SharedFactory,csPoly2DFactory)
00237 
00238   
00239   virtual csPoly2D* Create () { csPoly2D* p = new csPoly2D (); return p; }
00240 };
00241 
00244 #endif // __CS_POLY2D_H__

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