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sglTransform.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: sglTransform.hpp
 *  Created: 14 November 1998
 *  Summary: transform the model view matrix before traversing the children
 *****************************************************************************/

#ifndef __SGL_TRANSFORM_HPP
#define __SGL_TRANSFORM_HPP

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

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

template <class T>
class SGL_DLL_API sglTransform : public sglGroup
{
public:
   sglTransform() { loadIdentity(); }
   virtual ~sglTransform() {}

   void loadIdentity();

   void setTranslation(T x, T y, T z);

   void setRotation(T angle, T x, T y, T z);  // radians

   void setRotation(T h, T p, T r);  // radians

   void setMatrix(const sglMat4<T> &m);

   const sglMat4<T> &getMatrix() const { return m_matrix; }

   // 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::computeTxToParent() for details.
   virtual void computeTxToParent(sglMat4f &curr_mat) const;

   // See sglNode::computeTxToParent() for details.
   virtual void computeTxToParent(sglMat4d &curr_mat) 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:
   // compute the bounding sphere
   virtual void computeBound();

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

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

   void checkForIdentity();
   void checkForDeformation();

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

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

protected:
   sglMat4<T> m_matrix;
   sglMat4<T> m_inv_mat;
   bool       m_is_ident;
   bool       m_rescale;
   bool       m_normalize;
};

//----------------------------------------------------------------------------
// convenience types:
//    template class 'should' only be float or double

typedef sglTransform<float>  sglTransformf;
typedef sglTransform<double> sglTransformd;

#endif

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