cameramanipulatorFollow.cpp

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/***************************************************************************
 *   Copyright (C) 2005 by Robot Group Leipzig                             *
 *    martius@informatik.uni-leipzig.de                                    *
 *    fhesse@informatik.uni-leipzig.de                                     *
 *    der@informatik.uni-leipzig.de                                        *
 *    frankguettler@gmx.de                                                 *
 *                                                                         *
 *   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.             *
 ***************************************************************************
 *                                                                         *
 *                                                                         *
 *   $Log: cameramanipulatorFollow.cpp,v $
 *   Revision 1.1.2.4  2006/03/19 13:37:29  robot3
 *   race mode now works
 *
 *   Revision 1.1.2.3  2006/03/19 10:51:32  robot3
 *   follow mode now centers the view on the robot
 *   if the robot is choosed (only once)
 *
 *   Revision 1.1.2.2  2006/03/08 13:17:33  robot3
 *   follow mode now works
 *
 *   Revision 1.1.2.1  2006/03/06 17:00:44  robot3
 *   first dummy follow version
 *
 *                                                                         *
 ***************************************************************************/

#include <osg/Notify>
#include "cameramanipulatorFollow.h"
//#include "mathutils.h"
#include "pos.h"

namespace lpzrobots {

  using namespace osg;
  using namespace osgGA;

  CameraManipulatorFollow::CameraManipulatorFollow(osg::Node* node,GlobalData& global)
    : CameraManipulator(node,global) {}

  CameraManipulatorFollow::~CameraManipulatorFollow(){}

  void CameraManipulatorFollow::calcMovementByAgent() {
    if (watchingAgentDefined && oldPositionOfAgentDefined) {
      // then manipulate desired view and desired eye
      const double* robMove = (watchingAgent->getRobot()->getPosition()-oldPositionOfAgent).toArray();
      // attach the robSpeed to desired eye
      for (int i=0;i<=2;i++) {
        if (!isNaN(robMove[i])) {
          desiredEye[i]+=robMove[i];}
        else 
          std::cout << "NAN exception!" << std::endl;
      }
    }
  }


  void CameraManipulatorFollow::setHomeViewByAgent() {
    // ok here the camera will center on the robot
    if (watchingAgent!=NULL) {
      // the actual position of the agent has to be recognized
      // we use the Position getPosition() from OdeRobot
      Position robPos = watchingAgent->getRobot()->getPosition();
      // desiredEye is the position of the camera
      // calculate the horizontal angle, means pan (view.x)
      if (robPos.x-desiredEye[0]!=0) { // division by zero
        desiredView[0]= atan((desiredEye[0]-robPos.x)/(robPos.y-desiredEye[1]))
          / PI*180.0f+180.0f;
        if (desiredEye[1]-robPos.y<0) // we must switch
                  desiredView[0]+=180.0f;
      }
      // calculate the vertical angle
      if (robPos.z-desiredEye[2]!=0) { // division by zero
        // need dz and sqrt(dx^2+dy^2) for calulation
        desiredView[1]=-atan((sqrt(square(desiredEye[0]-robPos.x)+
                                  square(desiredEye[1]-robPos.y)))
                            /(robPos.z-desiredEye[2]))
          / PI*180.0f-90.0f;
        if (desiredEye[2]-robPos.z<0) // we must switch
          desiredView[1]+=180.0f;
      }
    }
  }
  
}

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