glc_repcrossmover.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_repcrossmover.h"
#include "glc_viewport.h"

// Default constructor
GLC_RepCrossMover::GLC_RepCrossMover(GLC_Viewport* pViewport)
: GLC_RepMover(pViewport)
{

}

// Copy constructor
GLC_RepCrossMover::GLC_RepCrossMover(const GLC_RepCrossMover& repMover)
: GLC_RepMover(repMover)
{

}

GLC_RepCrossMover::~GLC_RepCrossMover()
{

}

// Get Functions

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

// OpenGL Functions

// Virtual interface for OpenGL Geometry set up.
void GLC_RepCrossMover::glDraw()
{
        int nLgAxe;
        const int winHSize= m_pViewport->viewHSize();
        const int winVSize= m_pViewport->viewVSize();
        if (winHSize > winVSize)
        {
                nLgAxe = static_cast<int>(static_cast<double>(winVSize) / 2.0);
        }
        else
        {
                nLgAxe = static_cast<int>(static_cast<double>(winHSize) / 2.0);
        }

        // Compute the length of camera's field of view
        const double ChampsVision = 2 * (m_pViewport->cameraHandle()->distEyeTarget()) *  tan((m_pViewport->viewAngle() * glc::PI / 180.0) / 2.0);

        // the side of camera's square is mapped on Vertical length of window
        // Axis length in OpenGL unit = length(Pixel) * (dimend GL / dimens Pixel)
        const double dLgAxe= ((double)nLgAxe * ChampsVision / (double)winVSize) / 7;
        const double dDecAxe= dLgAxe / 3;
        glPushMatrix();

        glTranslated(m_pViewport->cameraHandle()->target().x(), m_pViewport->cameraHandle()->target().y(),
                        m_pViewport->cameraHandle()->target().z() );

        // Graphic properties
        glDisable(GL_TEXTURE_2D);
        glDisable(GL_LIGHTING);
        glColor4d(m_MainColor.redF(), m_MainColor.greenF(), m_MainColor.blueF(), m_MainColor.alphaF());
        glLineWidth(1.0);

        // Display camera's target lines
        glBegin(GL_LINES);
                //X axis
                glVertex3d(-dLgAxe, 0, 0);
                glVertex3d(-dDecAxe, 0, 0);
                glVertex3d(dDecAxe, 0, 0);
                glVertex3d(dLgAxe, 0, 0);

                //Y axis
                glVertex3d(0, -dLgAxe, 0);
                glVertex3d(0, -dDecAxe, 0);
                glVertex3d(0, dDecAxe, 0);
                glVertex3d(0, dLgAxe, 0);

                //Z axis
                glVertex3d(0, 0, -dLgAxe);
                glVertex3d(0, 0, -dDecAxe);
                glVertex3d(0, 0, dDecAxe);
                glVertex3d(0, 0, dLgAxe);

        glEnd();

        glPopMatrix();

}