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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 "fastDraw.h"
using namespace std;
using namespace qglviewer;
void Viewer::init()
{
// Increase the material shininess, so that the difference between
// the two versions of the spiral is more visible.
glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, 50.0);
GLfloat specular_color[4] = { 0.8, 0.8, 0.8, 1.0 };
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, specular_color);
restoreStateFromFile();
help();
}
static void drawSpiral(bool simplified = false)
{
int nbSteps = 600;
int nbSub = 50;
if (simplified)
{
nbSteps = 60;
nbSub = 2;
}
for (float n=0; n<nbSub; ++n)
{
glBegin(GL_QUAD_STRIP);
for (float i=0.0; i<nbSteps; ++i)
{
float ratio = i/nbSteps;
float angle = 21.0*ratio;
float radius = 1.0 - 0.5*ratio;
Vec center(radius*cos(angle), ratio-0.5, radius*sin(angle));
for (unsigned short j=0; j<2; ++j)
{
float delta = 3.0*(n+j)/nbSub;
Vec shift(cos(angle)*cos(delta), sin(delta), sin(angle)*cos(delta));
glColor3f(1-ratio, (n+j)/nbSub , ratio);
glNormal3fv(shift);
glVertex3fv(center+0.2*shift);
}
}
glEnd();
}
}
void Viewer::draw()
{
drawSpiral();
}
void Viewer::fastDraw()
{
drawSpiral(true);
}
QString Viewer::helpString() const
{
QString text("<h2>F a s t D r a w</h2>");
text += "The <code>fastDraw()</code> function is called instead of <code>draw()</code> when the camera ";
text += "is manipulated. Providing such a simplified version of <code>draw()</code> allows for interactive ";
text += "frame rates when the camera is moved, even for very complex scenes.";
return text;
}
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