CrystalSpace

Public API Reference

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 
00022 #include "csextern.h"
00023 
00024 #include "csgeom/vector2.h"
00032 class csBox2;
00033 class csPlane2;
00034 
00035 struct iClipper2D;
00036 
00040 class CS_CRYSTALSPACE_EXPORT csPoly2D
00041 {
00042 protected:
00044   csVector2* vertices;
00046   size_t num_vertices;
00048   size_t max_vertices;
00049 public:
00053   csPoly2D (size_t start_size = 10);
00054 
00056   csPoly2D (const csPoly2D& copy);
00057 
00059   ~csPoly2D ();
00060 
00062   csPoly2D& operator= (const csPoly2D& other);
00063 
00067   void MakeEmpty ();
00068 
00072   size_t GetVertexCount () const { return num_vertices; }
00073 
00077   csVector2* GetVertices () { return vertices; }
00078 
00082   const csVector2* GetVertices () const { return vertices; }
00083 
00087   csVector2* GetVertex (size_t i)
00088   {
00089     if (i>=num_vertices) return 0;
00090     return &vertices[i];
00091   }
00092 
00096   csVector2& operator[] (size_t i)
00097   {
00098     CS_ASSERT (i < num_vertices);
00099     return vertices[i];
00100   }
00101 
00105   const csVector2& operator[] (size_t i) const
00106   {
00107     CS_ASSERT (i < num_vertices);
00108     return vertices[i];
00109   }
00110 
00114   csVector2* GetFirst ()
00115   { if (num_vertices<=0) return 0;  else return vertices; }
00116 
00120   csVector2* GetLast ()
00121   { if (num_vertices<=0) return 0;  else return &vertices[num_vertices-1]; }
00122 
00126   bool In (const csVector2& v);
00127 
00131   static bool In (csVector2* poly, size_t num_poly, const csVector2& v);
00132 
00136   void MakeRoom (size_t new_max);
00137 
00141   void SetVertexCount (size_t n)
00142   {
00143     MakeRoom (n);
00144     num_vertices = n;
00145   }
00146 
00151   size_t AddVertex (const csVector2& v) { return AddVertex (v.x, v.y); }
00152 
00157   size_t AddVertex (float x, float y);
00158 
00163   void SetVertices (csVector2 const* v, size_t num)
00164   {
00165     MakeRoom (num);
00166     memcpy (vertices, v, (num_vertices = num) * sizeof (csVector2));
00167   }
00168 
00177   bool ClipAgainst (iClipper2D* view);
00178 
00187   void Intersect (const csPlane2& plane, csPoly2D& left,
00188         csPoly2D& right) const;
00189 
00194   void ClipPlane (const csPlane2& plane, csPoly2D& right) const;
00195 
00204   void ExtendConvex (const csPoly2D& other, size_t this_edge);
00205 
00209   float GetSignedArea();
00210 
00216   void Random (size_t num, const csBox2& max_bbox);
00217 };
00218 
00224 class csPoly2DFactory
00225 {
00226 public:
00227   // Needed for GCC4. Otherwise emits a flood of "virtual functions but
00228   // non-virtual destructor" warnings.
00229   virtual ~csPoly2DFactory() {}
00230 
00232    CS_DECLARE_STATIC_CLASSVAR(sharedFactory,SharedFactory,csPoly2DFactory)
00233 
00234   
00235   virtual csPoly2D* Create ()
00236   {
00237     csPoly2D* p = new csPoly2D ();
00238     return p;
00239   }
00240 };
00241 
00244 #endif // __CS_POLY2D_H__

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