OSGOffCenterPerspectiveCamera.cpp

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/*---------------------------------------------------------------------------*\
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\*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*\
 *                                License                                    *
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 * This library is free software; you can redistribute it and/or modify it   *
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//---------------------------------------------------------------------------
//  Includes
//---------------------------------------------------------------------------

#include <stdlib.h>
#include <stdio.h>
#include <math.h>

#include "OSGConfig.h"

#include <OSGBaseFunctions.h>
#include <OSGBaseTypes.h>
#include <OSGLog.h>
#include <OSGVector.h>
#include <OSGMatrix.h>
#include <OSGMatrixUtility.h>

#include "OSGNodePtr.h"
#include "OSGViewport.h"
#include "OSGCamera.h"
#include "OSGWindow.h"
#include "OSGBackground.h"
#include "OSGOffCenterPerspectiveCamera.h"

OSG_USING_NAMESPACE


/***************************************************************************\
 *                            Description                                  *
\***************************************************************************/

/***************************************************************************\
 *                           Class methods                                 *
\***************************************************************************/

/*-------------------------------------------------------------------------*\
 -  private                                                                -
\*-------------------------------------------------------------------------*/

void OffCenterPerspectiveCamera::initMethod(void)
{
}

/***************************************************************************\
 *                           Instance methods                              *
\***************************************************************************/

/*-------------------------------------------------------------------------*\
 -  public                                                                 -
\*-------------------------------------------------------------------------*/


/*------------- constructors & destructors --------------------------------*/

OffCenterPerspectiveCamera::OffCenterPerspectiveCamera(void) :
    Inherited()
{
}

OffCenterPerspectiveCamera::
OffCenterPerspectiveCamera(const OffCenterPerspectiveCamera &source) :
    Inherited(source)
{
}

OffCenterPerspectiveCamera::~OffCenterPerspectiveCamera(void)
{
}

void OffCenterPerspectiveCamera::changed(BitVector whichField, UInt32 origin)
{
    Inherited::changed(whichField, origin);
}

/*-------------------------- your_category---------------------------------*/

void OffCenterPerspectiveCamera::draw(      DrawAction *OSG_CHECK_ARG(action), 
                             const Viewport&   OSG_CHECK_ARG(port ))
{
}

bool OffCenterPerspectiveCamera::
MatrixPerspectivePrincipalPnt(Matrix &result,
                  Real32 rFovy,
                  Real32 rAspect,
                  Real32 rNear,
                  Real32 rFar,
                  Real32 rPrincipalPointX,
                  Real32 rPrincipalPointY)
{
    Real32 ct = osgtan(rFovy);
    bool error = false;
    
    if(rNear > rFar)
    {
        SWARNING << "MatrixPerspective: near " << rNear << " > far " << rFar
                 << "!\n" << std::endl;
        error = true;
    }

    if(rFovy <= Eps)
    {
        SWARNING << "MatrixPerspective: fovy " << rFovy << " very small!\n"
                 << std::endl;
        error = true;
    }

    if(osgabs(rNear - rFar) < Eps)
    {
        SWARNING << "MatrixPerspective: near " << rNear << " ~= far " << rFar
                 << "!\n" << std::endl;
        error = true;
    }

    if(rAspect < Eps)
    {
        SWARNING << "MatrixPerspective: aspect ratio " << rAspect
                 << " very small!\n" << std::endl;
        error = true;
    }

    if(error)
    {
        result.setIdentity();
        return true;
    }
    
    MatrixFrustum( result, 
                    -rNear * ct * rAspect * (Real32(1)+rPrincipalPointX), 
                     rNear * ct * rAspect * (Real32(1)-rPrincipalPointX),
                    -rNear * ct * (Real32(1)+rPrincipalPointY), 
                     rNear * ct * (Real32(1)-rPrincipalPointY), 
                     rNear, 
                     rFar                );

    return false;
}

void OffCenterPerspectiveCamera::getProjection(Matrix& result, 
    UInt32 width, UInt32 height)
{
    Real32 fov = getFov();

    // catch some illegal cases
    if(fov < 0 || width == 0 || height == 0)
    {
        result.setIdentity();
        return;
    }
    
    // try to be nice to people giving degrees...
    if(fov > Pi)
        fov = osgdegree2rad(fov);

    Real32 principalPointX = getPrincipalPoint()[0];
    Real32 principalPointY = getPrincipalPoint()[1];

    // if principal point (x,y) is default (==(0,0)) everything works
    // like before or rather for an symmetical camera
    if ( principalPointX==Real32(0) && principalPointY==Real32(0) ) {
      MatrixPerspective(result, fov / 2, 
            width /(Real32) height * getAspect(), 
            getNear(), getFar());
    } 
    else {
      MatrixPerspectivePrincipalPnt(result, fov / 2, 
                    width /(Real32) height * getAspect(), 
                    getNear(), getFar(),
                    principalPointX, principalPointY);
    }
}
    

/*------------------------------- dump ----------------------------------*/

void OffCenterPerspectiveCamera::dump(      UInt32    OSG_CHECK_ARG(uiIndent), 
                             const BitVector OSG_CHECK_ARG(bvFlags)) const
{
    SLOG << "Dump OffCenterPerspectiveCamera NI" << std::endl;
}

    

/*------------------------------------------------------------------------*/
/*                              cvs id's                                  */

#ifdef OSG_SGI_CC
#pragma set woff 1174
#endif

#ifdef OSG_LINUX_ICC
#pragma warning(disable : 177)
#endif

namespace
{
    static Char8 cvsid_cpp       [] = "@(#)$Id: OSGOffCenterPerspectiveCamera.cpp,v 1.1 2005/07/18 18:46:23 dirk Exp $";
    static Char8 cvsid_hpp       [] = OSGOFFCENTERPERSPECTIVECAMERA_HEADER_CVSID;
    static Char8 cvsid_inl       [] = OSGOFFCENTERPERSPECTIVECAMERA_INLINE_CVSID;

    static Char8 cvsid_fields_hpp[] = OSGOFFCENTERPERSPECTIVECAMERAFIELDS_HEADER_CVSID;
}

#ifdef __sgi
#pragma reset woff 1174
#endif

---