glc_reptrackballmover.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_reptrackballmover.h"
#include "glc_viewport.h"
#include "../glc_factory.h"
#include <QGLContext>

using namespace glc;
#define ARCANGLE (30 * PI / 180)

GLC_RepTrackBallMover::GLC_RepTrackBallMover(GLC_Viewport* pViewport)
: GLC_RepMover(pViewport)
, m_Radius(1.0)
, m_MainCircle(m_Radius)
, m_Arc1(GLC_Factory::instance()->createCircle(m_Radius, ARCANGLE))
, m_MatArc1()
, m_Arc2(GLC_Factory::instance()->createCircle(m_Radius, ARCANGLE))
, m_MatArc2()
, m_Ratio(0.95)
{
        m_MainCircle.setWireColor(GLC_RepMover::m_MainColor);
        m_Arc1.geomAt(0)->setWireColor(GLC_RepMover::m_MainColor);
        m_Arc2.geomAt(0)->setWireColor(GLC_RepMover::m_MainColor);

        // 2 circle arcs position
        GLC_Matrix4x4 MatRot(Z_AXIS, -ARCANGLE / 2);
        GLC_Matrix4x4 MatInt(Y_AXIS, -PI / 2);
        MatRot= MatInt * MatRot;

        m_MatArc1= MatRot;

        MatInt.setMatRot(Z_AXIS, PI/2);
        MatRot= MatInt * MatRot;

        m_MatArc2= MatRot;

}

// Copy constructor
GLC_RepTrackBallMover::GLC_RepTrackBallMover(const GLC_RepTrackBallMover& repMover)
: GLC_RepMover(repMover)
, m_Radius(repMover.m_Radius)
, m_MainCircle(repMover.m_MainCircle)
, m_Arc1(repMover.m_Arc1.deepCopy())
, m_MatArc1(repMover.m_MatArc1)
, m_Arc2(repMover.m_Arc2.deepCopy())
, m_MatArc2(repMover.m_MatArc2)
, m_Ratio(repMover.m_Ratio)
{

}

GLC_RepTrackBallMover::~GLC_RepTrackBallMover()
{

}


// Get Functions

// Return a clone of the repmover
GLC_RepMover* GLC_RepTrackBallMover::clone() const
{
        return new GLC_RepTrackBallMover(*this);
}

// Set Functions

// Set Arcs orientation and position in concordance with mouse position
void GLC_RepTrackBallMover::init()
{
        Q_ASSERT(NULL != m_pRepMoverInfo);
        Q_ASSERT(!m_pRepMoverInfo->m_VectorInfo.isEmpty());
        Q_ASSERT(!m_pRepMoverInfo->m_MatrixInfo.isEmpty());

        GLC_Vector3d VectAngle(m_pRepMoverInfo->m_VectorInfo.first());
        VectAngle.setZ(0);
        VectAngle.setLength(1);

        GLC_Matrix4x4 MatRot;
        double Angle;

        // Compute the 2 arcs orientation
        if (VectAngle.y() > 0)
        {       // Angle entre 0 et PI
                Angle= acos(VectAngle.x());
                MatRot.setMatRot(Z_AXIS, Angle);
        }
        else
        {       // Angle between 0 et -PI
                Angle= -acos(VectAngle.x());
                MatRot.setMatRot(Z_AXIS, Angle);
        }

        // Composition of orientation matrix and mapping matrix
        MatRot= m_pRepMoverInfo->m_MatrixInfo.first() * MatRot;

        m_Arc1.setMatrix(MatRot * m_MatArc1);
        m_Arc2.setMatrix(MatRot * m_MatArc2);
}

// Set Arcs position in concordance with mouse position
void GLC_RepTrackBallMover::update()
{
        Q_ASSERT(NULL != m_pRepMoverInfo);
        Q_ASSERT(!m_pRepMoverInfo->m_MatrixInfo.isEmpty());
        const GLC_Matrix4x4 matrix(m_pRepMoverInfo->m_MatrixInfo.first());
        m_Arc1.multMatrix(matrix);
        m_Arc2.multMatrix(matrix);
}

// overload function setColor(color);
void GLC_RepTrackBallMover::setMainColor(const QColor& color)
{
        GLC_RepMover::setMainColor(color);
        m_MainCircle.setWireColor(GLC_RepMover::m_MainColor);
        m_Arc1.geomAt(0)->setWireColor(GLC_RepMover::m_MainColor);
        m_Arc2.geomAt(0)->setWireColor(GLC_RepMover::m_MainColor);
}

// OpenGL Functions

// Virtual interface for OpenGL Geometry set up.
void GLC_RepTrackBallMover::glDraw()
{
        computeRadius();
        const double aspectRatio= static_cast<double>(m_pViewport->viewHSize())/static_cast<double>(m_pViewport->viewVSize());

        // Save current state
        GLboolean depthTest, blend;
        glGetBooleanv(GL_DEPTH_TEST, &depthTest);
        glGetBooleanv(GL_BLEND, &blend);

        // orbit circle must be shown
        if (depthTest) glDisable(GL_DEPTH_TEST);

        glMatrixMode(GL_PROJECTION);
        glPushMatrix();
        glLoadIdentity();
        glOrtho(aspectRatio * -1.0 ,aspectRatio * 1.0 ,-1.0 ,1.0 ,-1.0 ,1.0);
        glMatrixMode(GL_MODELVIEW);
        glPushMatrix();
        glLoadIdentity();

        if (blend) glDisable(GL_BLEND);
        m_RenderProperties.setRenderingFlag(glc::WireRenderFlag);
        // Display arcs
        m_Arc1.render(glc::WireRenderFlag);
        m_Arc2.render(glc::WireRenderFlag);
        // Display base class (Main circle)
        m_MainCircle.render(m_RenderProperties);

    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
        m_RenderProperties.setRenderingFlag(glc::TransparentRenderFlag);
        // Display arcs
        m_Arc1.render(glc::TransparentRenderFlag);
        m_Arc2.render(glc::TransparentRenderFlag);
        // Display base class (Main circle)
        m_MainCircle.render(m_RenderProperties);

        glPopMatrix();
        glMatrixMode(GL_PROJECTION);
        glPopMatrix();
        glMatrixMode(GL_MODELVIEW);

        if (depthTest) glEnable(GL_DEPTH_TEST);
        if (!blend)  glEnable(GL_BLEND);

}

// Private services Functions

// Compute trackball radius
void GLC_RepTrackBallMover::computeRadius()
{
        int nRayonSph;
        const double winHSize= static_cast<double>(m_pViewport->viewHSize());
        const double winVSize= static_cast<double>(m_pViewport->viewVSize());

        if (winHSize > winVSize)
        {
                nRayonSph = static_cast<int>(m_Ratio * winVSize / 2.0);
        }
        else
        {
                nRayonSph = static_cast<int>(m_Ratio * winHSize / 2.0);
        }

        // Compute the length of camera's field of view
        const double ChampsVision = 2.0;

        // the side of camera's square is mapped on Vertical length of window
        // Circle radius in OpenGL unit = Radius(Pixel) * (dimend GL / dimens Pixel)
        const double RayonSph= fabs((static_cast<double>(nRayonSph) * ChampsVision / winVSize));

        if ((!qFuzzyCompare(RayonSph, 0.0) && !qFuzzyCompare(RayonSph - m_Radius, 0.0)) || (RayonSph < 2.0))
        {
                // Main circle radius
                m_MainCircle.setRadius(RayonSph);

                GLC_Circle* pCircle;
                // Arc 1 radius
                pCircle= static_cast<GLC_Circle*>(m_Arc1.geomAt(0));
                pCircle->setRadius(RayonSph);
                // Arc 2 radius
                pCircle= static_cast<GLC_Circle*>(m_Arc2.geomAt(0));
                pCircle->setRadius(RayonSph);
        }

}