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 *   Copyright (C) 2006 by Pablo Odorico                                   *
 *   pablo.odorico@gmail.com                                               *
 *                                                                         *
 *   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        *
 *   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.             *

#ifndef CAMERA_H
#define CAMERA_H

#include <GL/gl.h>
#include <QMatrix>

      Camera class

      This class doesn't update the scene (updateGL in GLWidget), but
      contains camera-related information and applies OpenGL transformations
00033 class Camera {

      Camera(GLfloat x, GLfloat y, GLfloat z, GLfloat newNear, GLfloat newFar);

      /// Sets angles relative to current values (setRot assigns new values)
      void turn(GLfloat dx, GLfloat dy, GLfloat dz);
      /// Sets position relative to current values (setPos assigns new values)
      /// it simulates a Half-Life kind of camera movement
      void move(GLfloat angle);
      /// Sets spherical angles relative to current values (setOrbit assigns new values)
      void orbit(GLfloat dAlpha, GLfloat dBeta);

      /// Calls gluPerspective and optionally sets near and far
      void perspective(GLfloat yFov= 45, GLfloat ratio= 4.0/3.0, GLfloat newNear=-1, GLfloat newFar=-1);

      /// Calls glTranslatef using -{x,y,z}Pos
      void applyPos();
      /// Calls glRotatef using -{x,y,z}Rot
      void applyRot();

      /// Mathematical implementation of gluLookAt (doesn't make OpenGL calls)
      void lookAt(GLfloat x=0, GLfloat y=0, GLfloat z=0);
      /// Adjust spherical coords from the current cartesian coordinates
      void sphericalFromPosition();
      /// Sets the cartesian coordinates given the current spherical coordinates
      void commitSpherical();

      /// Resets values
      void reset();

      /// |Position|
      GLfloat distFromOrigin();

      /// Set
      void setPos(GLfloat x, GLfloat y, GLfloat z);
      void setXPos(GLfloat x);
      void setYPos(GLfloat y);
      void setZPos(GLfloat z);

      void setRot(GLfloat newXRot, GLfloat newYRot, GLfloat newZRot);
      void setXRot(GLfloat xAng);
      void setYRot(GLfloat yAng);
      void setZRot(GLfloat zAng);

      void setOrbit(GLfloat newAlpha, GLfloat newBeta, GLfloat newRho);
      // Use commitSpherical() to commit changes to {x,y,z}Pos
      void setAlphaOrbit(GLfloat alpha);
      void setBetaOrbit(GLfloat beta);
      void setRhoOrbit(GLfloat rho);

      void setLimits(GLfloat newX, GLfloat newY, GLfloat newZ, GLfloat newRho);
      void setStep(GLfloat newSpeed);

      void setRun(bool newRun);

      /// Get
      GLfloat getXPos() const;
      GLfloat getYPos() const;
      GLfloat getZPos() const;

      GLfloat getXRot() const;
      GLfloat getYRot() const;
      GLfloat getZRot() const;

      GLfloat getXMax() const;
      GLfloat getYMax() const;
      GLfloat getZMax() const;
      GLfloat getRhoMax() const;

      GLfloat getAlphaOrbit() const;
      GLfloat getBetaOrbit() const;
      GLfloat getRhoOrbit() const;

      GLfloat getNear() const;
      GLfloat getFar() const;
      GLfloat getStep() const;

      bool getRun() const;

      /// Sets val between min and max
      static GLfloat limit(GLfloat val, GLfloat min, GLfloat max);
      static int limit(int val, int min, int max);

      /// Real coords
      /// Camera Azimuth
00124       GLfloat xPos;
      /// Camera elevation above the horizon
00126       GLfloat yPos;
      /// Almost never used, but supported
00128       GLfloat zPos;

      /// Rotation
00131       GLfloat xRot, yRot, zRot;

      /// Position limits: [-max, max]
00134       GLfloat xMax, yMax, zMax, rhoMax;

      /// Minimum and Maximum viewing distance
00137       GLfloat nearEnd;
      GLfloat farEnd;

      /// Moving speed
00141       GLfloat step;
      bool run;
      static const float runDelta= 0.04;

      /** Camera orbitation around origin, these coords are applied to
            {x,y,z}Rot with commitSpherical()
            Basic idea: http://deslab.mit.edu/DesignLab/courses/13.016/graphics/viewing.html
            theta -> alphaOrbit
            phi -> betaOrbit
            rho -> rhoOrbit
00153       GLfloat alphaOrbit, betaOrbit, rhoOrbit;

#endif // CAMERA_H

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