Public API Reference

csgeom/poly2d.h

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/*
    Copyright (C) 1998,2000 by Jorrit Tyberghein

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#ifndef __CS_POLY2D_H__
#define __CS_POLY2D_H__

#include "csextern.h"

#include "csgeom/vector2.h"
class csBox2;
class csPlane2;

struct iClipper2D;

class CS_CRYSTALSPACE_EXPORT csPoly2D
{
protected:
  csVector2* vertices;
  size_t num_vertices;
  size_t max_vertices;
public:
  csPoly2D (size_t start_size = 10);

  csPoly2D (const csPoly2D& copy);

  ~csPoly2D ();

  csPoly2D& operator= (const csPoly2D& other);

  void MakeEmpty ();

  size_t GetVertexCount () const { return num_vertices; }

  csVector2* GetVertices () { return vertices; }

  const csVector2* GetVertices () const { return vertices; }

  csVector2* GetVertex (size_t i)
  {
    if (i>=num_vertices) return 0;
    return &vertices[i];
  }

  csVector2& operator[] (size_t i)
  {
    CS_ASSERT (i < num_vertices);
    return vertices[i];
  }

  const csVector2& operator[] (size_t i) const
  {
    CS_ASSERT (i < num_vertices);
    return vertices[i];
  }

  csVector2* GetFirst ()
  { if (num_vertices<=0) return 0;  else return vertices; }

  csVector2* GetLast ()
  { if (num_vertices<=0) return 0;  else return &vertices[num_vertices-1]; }

  bool In (const csVector2& v);

  static bool In (csVector2* poly, size_t num_poly, const csVector2& v);

  void MakeRoom (size_t new_max);

  void SetVertexCount (size_t n)
  {
    MakeRoom (n);
    num_vertices = n;
  }

  size_t AddVertex (const csVector2& v) { return AddVertex (v.x, v.y); }

  size_t AddVertex (float x, float y);

  void SetVertices (csVector2 const* v, size_t num)
  {
    MakeRoom (num);
    memcpy (vertices, v, (num_vertices = num) * sizeof (csVector2));
  }

  bool ClipAgainst (iClipper2D* view);

  void Intersect (const csPlane2& plane, csPoly2D& left,
        csPoly2D& right) const;

  void ClipPlane (const csPlane2& plane, csPoly2D& right) const;

  void ExtendConvex (const csPoly2D& other, size_t this_edge);

  float GetSignedArea();

  void Random (size_t num, const csBox2& max_bbox);
};

class csPoly2DFactory
{
public:
  // Needed for GCC4. Otherwise emits a flood of "virtual functions but
  // non-virtual destructor" warnings.
  virtual ~csPoly2DFactory() {}

   CS_DECLARE_STATIC_CLASSVAR(sharedFactory,SharedFactory,csPoly2DFactory)

  
  virtual csPoly2D* Create ()
  {
    csPoly2D* p = new csPoly2D ();
    return p;
  }
};

#endif // __CS_POLY2D_H__

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