/*************************************************************************
 *
 *  $RCSfile: camera3d.cxx,v $
 *
 *  $Revision: 1.2 $
 *
 *  last change: $Author: thb $ $Date: 2001-07-17 07:04:30 $
 *
 *  The Contents of this file are made available subject to the terms of
 *  either of the following licenses
 *
 *         - GNU Lesser General Public License Version 2.1
 *         - Sun Industry Standards Source License Version 1.1
 *
 *  Sun Microsystems Inc., October, 2000
 *
 *  GNU Lesser General Public License Version 2.1
 *  =============================================
 *  Copyright 2000 by Sun Microsystems, Inc.
 *  901 San Antonio Road, Palo Alto, CA 94303, USA
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License version 2.1, as published by the Free Software Foundation.
 *
 *  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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *  MA  02111-1307  USA
 *
 *
 *  Sun Industry Standards Source License Version 1.1
 *  =================================================
 *  The contents of this file are subject to the Sun Industry Standards
 *  Source License Version 1.1 (the "License"); You may not use this file
 *  except in compliance with the License. You may obtain a copy of the
 *  License at http://www.openoffice.org/license.html.
 *
 *  Software provided under this License is provided on an "AS IS" basis,
 *  WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
 *  WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
 *  MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
 *  See the License for the specific provisions governing your rights and
 *  obligations concerning the Software.
 *
 *  The Initial Developer of the Original Code is: Sun Microsystems, Inc.
 *
 *  Copyright: 2000 by Sun Microsystems, Inc.
 *
 *  All Rights Reserved.
 *
 *  Contributor(s): _______________________________________
 *
 *
 ************************************************************************/

#ifndef _CAMERA3D_HXX
#include "camera3d.hxx"
#endif

#ifndef _STREAM_HXX
#include <tools/stream.hxx>
#endif

#ifndef _SVDIO_HXX
#include <svdio.hxx>
#endif

/*************************************************************************
|*
|* Konstruktor
|*
\************************************************************************/

Camera3D::Camera3D(const Vector3D& rPos, const Vector3D& rLookAt,
                   double fFocalLen, double fBankAng) :
    aResetPos(rPos),
    aResetLookAt(rLookAt),
    fResetFocalLength(fFocalLen),
    fResetBankAngle(fBankAng),
    fBankAngle(fBankAng),
    bAutoAdjustProjection(TRUE)
{
    SetVPD(0);
    SetPosition(rPos);
    SetLookAt(rLookAt);
    SetFocalLength(fFocalLen);
}

/*************************************************************************
|*
|* Default-Konstruktor
|*
\************************************************************************/

Camera3D::Camera3D()
{
    Vector3D aVector3D(0,0,1);
    Camera3D(aVector3D, Vector3D());
}

/*************************************************************************
|*
|* Konstruktor
|*
\************************************************************************/

void Camera3D::Reset()
{
    SetVPD(0);
    fBankAngle = fResetBankAngle;
    SetPosition(aResetPos);
    SetLookAt(aResetLookAt);
    SetFocalLength(fResetFocalLength);
}

/*************************************************************************
|*
|* Defaultwerte fuer Reset setzen
|*
\************************************************************************/

void Camera3D::SetDefaults(const Vector3D& rPos, const Vector3D& rLookAt,
                            double fFocalLen, double fBankAng)
{
    aResetPos           = rPos;
    aResetLookAt        = rLookAt;
    fResetFocalLength   = fFocalLen;
    fResetBankAngle     = fBankAng;
}

/*************************************************************************
|*
|* ViewWindow setzen und PRP anpassen
|*
\************************************************************************/

void Camera3D::SetViewWindow(double fX, double fY, double fW, double fH)
{
    Viewport3D::SetViewWindow(fX, fY, fW, fH);
    if ( bAutoAdjustProjection )
        SetFocalLength(fFocalLength);
}

/*************************************************************************
|*
|* Kameraposition setzen
|*
\************************************************************************/

void Camera3D::SetPosition(const Vector3D& rNewPos)
{
    if ( rNewPos != aPosition )
    {
        aPosition = rNewPos;
        SetVRP(aPosition);
        SetVPN(aPosition - aLookAt);
        SetBankAngle(fBankAngle);
    }
}

/*************************************************************************
|*
|* Blickpunkt setzen
|*
\************************************************************************/

void Camera3D::SetLookAt(const Vector3D& rNewLookAt)
{
    if ( rNewLookAt != aLookAt )
    {
        aLookAt = rNewLookAt;
        SetVPN(aPosition - aLookAt);
        SetBankAngle(fBankAngle);
    }
}

/*************************************************************************
|*
|* Position und Blickpunkt setzen
|*
\************************************************************************/

void Camera3D::SetPosAndLookAt(const Vector3D& rNewPos,
                               const Vector3D& rNewLookAt)
{
    if ( rNewPos != aPosition || rNewLookAt != aLookAt )
    {
        aPosition = rNewPos;
        aLookAt = rNewLookAt;

        SetVRP(aPosition);
        SetVPN(aPosition - aLookAt);
        SetBankAngle(fBankAngle);
    }
}

/*************************************************************************
|*
|* seitlichen Neigungswinkel setzen
|*
\************************************************************************/

void Camera3D::SetBankAngle(double fAngle)
{
    Vector3D aDiff = aPosition - aLookAt;
    Vector3D aPrj = aDiff;

    fBankAngle = fAngle;

    if ( aDiff.Y() == 0 )
        aPrj.Y() = -1;
    else
    {   // aPrj = Projektion von aDiff auf die XZ-Ebene
        aPrj.Y() = 0;
        if ( aDiff.Y() < 0 )
            aPrj = -aPrj;
    }
    // von aDiff nach oben zeigenden View-Up-Vektor berechnen
    aPrj |= aDiff;
    aPrj |= aDiff;
    aDiff.Normalize();

    // auf Z-Achse rotieren, dort um BankAngle drehen und zurueck
    Matrix4D aTf;
    double fV = sqrt(aDiff.Y() * aDiff.Y() + aDiff.Z() * aDiff.Z());

    if ( fV != 0 )
        aTf.RotateX(aDiff.Y() / fV, aDiff.Z() / fV);
    aTf.RotateY(-aDiff.X(), fV);
    aTf.RotateZ(fBankAngle);
    aTf.RotateY(aDiff.X(), fV);
    if ( fV != 0 )
        aTf.RotateX(-aDiff.Y() / fV, aDiff.Z() / fV);

    SetVUV(aTf * aPrj);
}

/*************************************************************************
|*
|* Brennweite setzen
|*
\************************************************************************/

void Camera3D::SetFocalLength(double fLen)
{
    if ( fLen < 5 )
        fLen = 5;
    SetPRP(Vector3D(0, 0, fLen / 35.0 * aViewWin.W));
    fFocalLength = fLen;
}

/*************************************************************************
|*
|* Um die Kameraposition drehen, LookAt wird dabei veraendert
|*
\************************************************************************/

void Camera3D::Rotate(double fHAngle, double fVAngle)
{
    Matrix4D aTf;
    Vector3D aDiff = aLookAt - aPosition;
    double fV = sqrt(aDiff.X() * aDiff.X() + aDiff.Z() * aDiff.Z());

    if ( fV != 0 )  aTf.RotateY(aDiff.Z() / fV, aDiff.X() / fV);
    aTf.RotateZ(fVAngle);
    if ( fV != 0 )  aTf.RotateY(-aDiff.Z() / fV, aDiff.X() / fV);
    aTf.RotateY(fHAngle);

    aDiff *= aTf;
    SetLookAt(aPosition + aDiff);
}


/*************************************************************************
|*
|* Um den Blickpunkt drehen, Position wird dabei veraendert
|*
\************************************************************************/

void Camera3D::RotateAroundLookAt(double fHAngle, double fVAngle)
{
    Matrix4D aTf;
    Vector3D aDiff = aPosition - aLookAt;
    double fV = sqrt(aDiff.X() * aDiff.X() + aDiff.Z() * aDiff.Z());

    if ( fV != 0 )  aTf.RotateY(aDiff.Z() / fV, aDiff.X() / fV);
    aTf.RotateZ(fVAngle);
    if ( fV != 0 )  aTf.RotateY(-aDiff.Z() / fV, aDiff.X() / fV);
    aTf.RotateY(fHAngle);

    aDiff *= aTf;
    SetPosition(aLookAt + aDiff);
}

/*************************************************************************
|*
|* Stream-Out-Operator fuer Camera3D   fuer die Filerevision 3.1
|*
\************************************************************************/

void Camera3D::WriteData31(SvStream& rOut) const
{
#ifndef SVX_LIGHT
    Viewport3D::WriteData(rOut);

    rOut << aResetPos;
    rOut << aResetLookAt;
    rOut << fResetFocalLength;
    rOut << fResetBankAngle;
    rOut << aPosition;
    rOut << aLookAt;
    rOut << fFocalLength;
    rOut << fBankAngle;
    rOut << BOOL(bAutoAdjustProjection);
#endif
}

/*************************************************************************
|*
|* Stream-Out-Operator fuer Camera3D
|* Zur Version 356 wurde das Fileformat inkompatibel, wenn man das alte
|* Format schreiben will, muss man die Version am Stream abfragen.
|*
\************************************************************************/

void Camera3D::WriteData(SvStream& rOut) const
{
#ifndef SVX_LIGHT

    if (rOut.GetVersion() < 3560)  // FG: Ab der Release 356 wurde das Fileformat geaendert
    {                              //     Falls das Format der Version 31 geschrieben werden soll
        WriteData31(rOut);         //     muss am Stream die Version der 3.1 gesetzt sein.
        return;                    //     Im Prinzip kann man auf diese Art auch Zwischenversionen
    }                              //     erzeugen.

    SdrDownCompat aCompat(rOut, STREAM_WRITE);
#ifdef DBG_UTIL
    aCompat.SetID("Camera3D");
#endif
    Viewport3D::WriteData(rOut);

    rOut << aResetPos;              // Alles Vektoren 3*double
    rOut << aResetLookAt;
    rOut << fResetFocalLength;
    rOut << fResetBankAngle;
    rOut << aPosition;
    rOut << aLookAt;
    rOut << fFocalLength;
    rOut << fBankAngle;
    rOut << BOOL(bAutoAdjustProjection);
#endif
}

/*************************************************************************
|*
|* Stream-In-Operator fuer Camera3D
|*
\************************************************************************/

void Camera3D::ReadData(const SdrObjIOHeader& rHead, SvStream& rIn)
{
    if ( rIn.GetError() != SVSTREAM_OK )
        return;

    if ((rHead.GetVersion() < 13) || (rIn.GetVersion() < 3560))
    {
        ReadData31(rIn);
        return;
    }

    SdrDownCompat aCompat(rIn, STREAM_READ);
#ifdef DBG_UTIL
    aCompat.SetID("Camera3D");
#endif

    Viewport3D::ReadData(rHead, rIn);

    BOOL bTmp;

    rIn >> aResetPos;
    rIn >> aResetLookAt;
    rIn >> fResetFocalLength;
    rIn >> fResetBankAngle;
    rIn >> aPosition;
    rIn >> aLookAt;
    rIn >> fFocalLength;
    rIn >> fBankAngle;
    rIn >> bTmp; bAutoAdjustProjection = bTmp;

    SetVPD(0);
    SetPosAndLookAt(aPosition, aLookAt);
}

/*************************************************************************
|*
|* Stream-In-Operator fuer Camera3D
|*
\************************************************************************/

void Camera3D::ReadData31(SvStream& rIn)
{
    if ( rIn.GetError() != SVSTREAM_OK )
        return;

    Viewport3D::ReadData31 (rIn);

    BOOL bTmp;

    rIn >> aResetPos;
    rIn >> aResetLookAt;
    rIn >> fResetFocalLength;
    rIn >> fResetBankAngle;
    rIn >> aPosition;
    rIn >> aLookAt;
    rIn >> fFocalLength;
    rIn >> fBankAngle;
    rIn >> bTmp; bAutoAdjustProjection = bTmp;

    SetVPD(0);
    SetPosAndLookAt(aPosition, aLookAt);
}

/*************************************************************************
|*
|* Stream-Out-Operator fuer Camera3D
|*
\************************************************************************/

SvStream& operator<<(SvStream& rOStream, const Camera3D& rCam)
{
    rCam.WriteData31(rOStream);
    return rOStream;
}

/*************************************************************************
|*
|* Stream-In-Operator fuer Camera3D
|*
\************************************************************************/

SvStream& operator>>(SvStream& rIStream, Camera3D& rCam)
{
    rCam.ReadData31(rIStream);
    return rIStream;
}


/*************************************************************************
|*
|* FG: ??? Setzt wohl die Projektionsebene in eine bestimmte Tiefe
|*
\************************************************************************/

void Camera3D::SetFocalLengthWithCorrect(double fLen)
{
    if ( fLen < 5 )
        fLen = 5;
    SetPRP(Vector3D(0, 0, aPRP.Z () * fLen / fFocalLength));
    fFocalLength = fLen;
}