K3dCutEdge.cpp

Go to the documentation of this file.

/***************************************************************************
 *   Copyright (C) 2007 by Jan Koci   *
 *   honza.koci@email.cz   *
 *   http://kengine.sourceforge.net/tutorial/
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program 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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *

 ***************************************************************************/
#include "K3dCutEdge.h"

K3dCutEdge::K3dCutEdge(K3dGameData *_pGameData)
{
        m_pGameData = _pGameData;
        m_pIntersection = m_pGameData->GetIntersection();
}

K3dCutEdge::~K3dCutEdge()
{
}

K3dLineObj *K3dCutEdge::CutEdge(K3dLineObj *_pEdge, K3dPlaneObj *_pPlane)
{
        cout << "K3dLineObj *K3dCutEdge::CutEdge(K3dLineObj *_pEdge, K3dPlaneObj *_pPlane)" << endl;
        K3dLineObj *pBackEdge = NULL;
        if(m_pIntersection->LinePlane( *_pEdge, *_pPlane)==true)
        {
                // Store edge origin and direction vector
                K3dVector3Obj kOrigin = *_pEdge->GetOrigin();
                K3dVector3Obj kDirection = *_pEdge->GetDirection();
                // Set front of plane edge and create new back of plane edge
                K3dLineObj *pFrongEdge = _pEdge;
                pBackEdge = m_pGameData->GetLineBuild()->CreateNewLineObj();
                // Test distance between edge origin and plane
                float fDistance = m_pIntersection->PointPlane(*_pPlane, kOrigin);
                if(fDistance > (float) 0)
                {
                        // Set intersection point as front edge direction vector
                        *pFrongEdge->GetDirection() = m_pIntersection->GetIntrPoint();
                        // Set back edge origin and direction vector
                        *pBackEdge->GetOrigin() = kDirection;
                        *pBackEdge->GetDirection() = m_pIntersection->GetIntrPoint();
                }
                else if(fDistance < (float) 0)
                {
                        // Set intersection point as front edge origin vector
                        *pFrongEdge->GetOrigin() = m_pIntersection->GetIntrPoint();
                        // Set back edge origin and direction vector
                        *pBackEdge->GetOrigin() = kOrigin;
                        *pBackEdge->GetDirection() = m_pIntersection->GetIntrPoint();
                }
                else
                {
                        // If distance is zero, then vertex intersect the plane
                        return NULL;
                }
        }
        return pBackEdge;
}

---