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/usr/include/dime/entities/FaceEntity.h is in libdime-dev 0.20111205-2.

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/**************************************************************************\
 * Copyright (c) Kongsberg Oil & Gas Technologies AS
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\**************************************************************************/

#ifndef DIME_FACEENTITY_H
#define DIME_FACEENTITY_H

#include <dime/Basic.h>
#include <dime/entities/Entity.h>
#include <dime/util/Linear.h>

class DIME_DLL_API dimeFaceEntity : public dimeEntity 
{
public:
  bool isQuad() const;
  
  virtual bool getRecord(const int groupcode,
			 dimeParam &param,
			 const int index = 0) const;
  
  void setVertex(const int idx, const dimeVec3f &v);
  void setTriangle(const dimeVec3f &v0, const dimeVec3f &v1,
		   const dimeVec3f &v2);
  void setQuad(const dimeVec3f &v0, const dimeVec3f &v1,
	       const dimeVec3f &v2, const dimeVec3f &v3);
  const dimeVec3f &getVertex(const int idx) const;
  void getVertices(dimeVec3f &v0, dimeVec3f &v1,
		   dimeVec3f &v2, dimeVec3f &v3) const;
  
  virtual dxfdouble getThickness() const;
  virtual void getExtrusionDir(dimeVec3f &ed) const;
  
  GeometryType extractGeometry(dimeArray <dimeVec3f> &verts,
			       dimeArray <int> &indices,
			       dimeVec3f &extrusionDir,
			       dxfdouble &thickness);
  
  virtual int typeId() const;
  virtual bool isOfType(const int thetypeid) const;
  virtual int countRecords() const;

protected:

  virtual bool swapQuadCoords() const;
  
  virtual bool handleRecord(const int groupcode, 
			    const dimeParam &param,
			    dimeMemHandler * const memhandler);
  void copyCoords(const dimeFaceEntity * const entity);
  bool writeCoords(dimeOutput * const file);
  
  dimeFaceEntity();
  dimeVec3f coords[4];

}; // class dimeFaceEntity

inline const dimeVec3f &
dimeFaceEntity::getVertex(const int idx) const
{
  assert(idx >= 0 && idx < 4);
  return this->coords[idx]; 
}

inline bool
dimeFaceEntity::isQuad() const
{
  return (coords[2] != coords[3]);
}

inline void 
dimeFaceEntity::setVertex(const int idx, const dimeVec3f &v)
{
  assert(idx >= 0 && idx < 4);
  this->coords[idx] = v;
}

#endif // ! DIME_FACEENTITY_H