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sglBillboard.hpp

/*****************************************************************************
 * SGL: A Scene Graph Library
 *
 * Copyright (C) 1997-2001  Scott McMillan   All Rights Reserved.
 *
 * 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.
 *****************************************************************************
 *     File: sglBillboard.hpp
 *  Created: 2 December 1998
 *  Summary: transform the model view matrix to effect some sort of orientation
 *         : behaviour before traversing the children
 *****************************************************************************/

#ifndef __SGL_BILLBOARD_HPP
#define __SGL_BILLBOARD_HPP

#include <sgl.h>
#include <sglVector.hpp>
#include <sglMatrix.hpp>
#include <sglGroup.hpp>

//----------------------------------------------------------------------------

class SGL_DLL_API sglBillboard : public sglGroup
{
public:
   enum ModeEnum
   {
      ePOINT_ROT_EYE,
      ePOINT_ROT_WORLD,  // not yet implemented
      eAXIAL_ROT
   };

public:
   sglBillboard();
   virtual ~sglBillboard();

   const sglVec3d &getPos() const { return m_pos; }

   void setPos(const sglVec3d &p);

   const sglVec3d &getAxis() const { return m_axis; }

   void setAxis(const sglVec3d &v);

   void setMode(ModeEnum mode);

   ModeEnum getMode() { return m_mode; }

   // see sglNode::intersect(f) for details.
   virtual sglBound::IntersectResultEnum intersect(
      sglIntersectf &isector) const;

   // see sglNode::intersect(d) for details.
   virtual sglBound::IntersectResultEnum intersect(
      sglIntersectd &isector) const;

   // see sglNode::pick(f) for details.
   virtual void pick(sglPickf &pick_state, unsigned int cull_flags) const;

   // see sglNode::pick(d) for details.
   virtual void pick(sglPickd &pick_state, unsigned int cull_flags) const;

   // see sglNode::clone() for details.
   virtual sglNode *clone(unsigned int mode) const;

   // see sglObject::printInfo() for details.
   virtual void printInfo(ostream &ostrm, const char *indent_string) const;

protected:
   void computeOrientation(const sglMat4f &current_mat,
                           sglMat4f &new_mat) const;
   void computeOrientation(const sglMat4d &current_mat,
                           sglMat4d &new_mat) const;

   // compute the bounding sphere
   virtual void computeBound();

   // sglNode::cull(f) for details
   virtual void cull(sglCull<float> &trav_state,
                     unsigned int cull_flags) const;

   // sglNode::cull(d) for details
   virtual void cull(sglCull<double> &trav_state,
                     unsigned int cull_flags) const;

   void copyTo(sglBillboard *dst, unsigned int mode) const;

private:  // not implemented
   sglBillboard(const sglBillboard &);
   sglBillboard &operator=(const sglBillboard &);

protected:
   ModeEnum m_mode;
   sglVec3d m_pos;
   sglVec3d m_axis;
};

#endif

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