glc_rotationmanipulator.cpp

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/****************************************************************************

 This file is part of the GLC-lib library.
 Copyright (C) 2005-2008 Laurent Ribon (laumaya@users.sourceforge.net)
 http://glc-lib.sourceforge.net

 GLC-lib is free software; you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation; either version 3 of the License, or
 (at your option) any later version.

 GLC-lib 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 GLC-lib; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

 *****************************************************************************/

#include "glc_rotationmanipulator.h"
#include "../maths/glc_geomtools.h"

GLC_RotationManipulator::GLC_RotationManipulator(GLC_Viewport* pViewport, const GLC_Line3d& rotationLine)
: GLC_AbstractManipulator(pViewport)
, m_RotationLine(rotationLine)
{

}

GLC_RotationManipulator::GLC_RotationManipulator(const GLC_RotationManipulator& rotationmanipulator)
: GLC_AbstractManipulator(rotationmanipulator)
, m_RotationLine(rotationmanipulator.m_RotationLine)
{

}

GLC_RotationManipulator::~GLC_RotationManipulator()
{

}

GLC_AbstractManipulator* GLC_RotationManipulator::clone() const
{
        return new GLC_RotationManipulator(*this);
}

GLC_Matrix4x4 GLC_RotationManipulator::doManipulate(const GLC_Point3d& newPoint, const GLC_Vector3d& projectionDirection)
{
        // Project the given point on the sliding plane with the given direction
        GLC_Point3d projectedPoint;
        GLC_Line3d projectionLine1(GLC_AbstractManipulator::m_PreviousPosition, projectionDirection);
        GLC_Line3d projectionLine(newPoint, projectionDirection);

        // create the rotation plane
        const GLC_Point3d origine(m_RotationLine.startingPoint());
        GLC_Plane rotationPlane(m_RotationLine.direction(), origine);
        // Project the point on the previous computed plane
        glc::lineIntersectPlane(projectionLine1, rotationPlane, &(GLC_AbstractManipulator::m_PreviousPosition));
        glc::lineIntersectPlane(projectionLine, rotationPlane, &projectedPoint);

        // Compute the the to vector
        GLC_Vector3d vector1((GLC_AbstractManipulator::m_PreviousPosition - origine).normalize());
        GLC_Vector3d vector2((projectedPoint - origine).normalize());

        // Update previous position to this position
        GLC_AbstractManipulator::m_PreviousPosition= projectedPoint;

        // Return the rotation matrix
        const GLC_Matrix4x4 trans1(-origine);
        const GLC_Matrix4x4 trans2(origine);
        const GLC_Matrix4x4 rotation(vector1, vector2);

        return (trans2 * rotation * trans1);

}