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/****************************************************************************
Copyright (C) 2002-2007 Gilles Debunne (Gilles.Debunne@imag.fr)
This file is part of the QGLViewer library.
Version 2.2.6-3, released on August 28, 2007.
http://artis.imag.fr/Members/Gilles.Debunne/QGLViewer
libQGLViewer is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
libQGLViewer 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with libQGLViewer; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*****************************************************************************/
#include "cameraViewer.h"
using namespace qglviewer;
CameraViewer::CameraViewer(Camera* camera) : c(camera) {};
void CameraViewer::draw()
{
// Exactly the same draw than for 'Viewer'. The two viewers could also share a 'Scene' instance.
const float nbSteps = 200.0;
glBegin(GL_QUAD_STRIP);
for (int i=0; i<nbSteps; ++i)
{
const float ratio = i/nbSteps;
const float angle = 21.0f*ratio;
const float c = cos(angle);
const float s = sin(angle);
const float r1 = 1.0f - 0.8f*ratio;
const float r2 = 0.8f - 0.8f*ratio;
const float alt = ratio - 0.5f;
const float nor = 0.5f;
const float up = sqrt(1.0f-nor*nor);
glColor3f(1.0f-ratio, 0.2f , ratio);
glNormal3f(nor*c, up, nor*s);
glVertex3f(r1*c, alt, r1*s);
glVertex3f(r2*c, alt+0.05f, r2*s);
}
glEnd();
// Draws the other viewer's camera
glDisable(GL_LIGHTING);
glLineWidth(4.0);
glColor4f(1.0, 1.0, 1.0, 0.5);
c->draw();
glEnable(GL_LIGHTING);
}
void CameraViewer::init()
{
// Places the cameraViewer's camera far away in order to see the (other viewer) camera.
if (!restoreStateFromFile())
{
// Make near and far planes much further from scene in order not to clip c's display.
camera()->setZClippingCoefficient(50.0);
camera()->setViewDirection(qglviewer::Vec(0.0, -1.0, 0.0));
showEntireScene();
}
// Enable semi-transparent culling planes
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
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