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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 "screenCoordSystem.h"
#include <stdio.h>
#include <stdlib.h> // RAND_MAX
using namespace qglviewer;
using namespace std;
void Viewer::init()
{
for (int i=0; i<nbSaucers; i++)
{
Vec pos;
pos.x = rand() / static_cast<float>(RAND_MAX) - 0.5;
pos.y = rand() / static_cast<float>(RAND_MAX) - 0.5;
pos.z = rand() / static_cast<float>(RAND_MAX) - 0.5;
Quaternion ori(Vec(static_cast<float>(rand()) / RAND_MAX,
static_cast<float>(rand()) / RAND_MAX,
static_cast<float>(rand()) / RAND_MAX),
rand() / static_cast<float>(RAND_MAX) * M_PI);
saucerPos[i].setPosition(pos);
saucerPos[i].setOrientation(ori);
saucerColor[i].setRgb(int(255.0 * rand() / static_cast<float>(RAND_MAX)),
int(255.0 * rand() / static_cast<float>(RAND_MAX)),
int(255.0 * rand() / static_cast<float>(RAND_MAX)));
}
restoreStateFromFile();
help();
}
QString Viewer::helpString() const
{
QString text("<h2>S c r e e n C o o r d S y s t e m</h2>");
text += "This example illustrates the <i>startScreenCoordinatesSystem()</i> function ";
text += "which enables a GL drawing directly into the screen coordinate system.<br><br>";
text += "The arrows are drawned using this method. The screen projection coordinates ";
text += "of the objects is determined using <code>camera()->projectedCoordinatesOf()</code>, ";
text += "thus <i>attaching</i> the 2D arrows to 3D objects.";
return text;
}
void Viewer::drawSaucer() const
{
static GLUquadric* quadric = gluNewQuadric();
glTranslatef(0.0, 0.0, -0.014);
gluCylinder(quadric, 0.015, 0.03, 0.004, 32, 1);
glTranslatef(0.0, 0.0, 0.004);
gluCylinder(quadric, 0.03, 0.04, 0.01, 32, 1);
glTranslatef(0.0, 0.0, 0.01);
gluCylinder(quadric, 0.05, 0.03, 0.02, 32, 1);
glTranslatef(0.0, 0.0, 0.02);
gluCylinder(quadric, 0.03, 0.0, 0.003, 32, 1);
glTranslatef(0.0, 0.0, -0.02);
}
void Viewer::draw()
{
static Vec proj[nbSaucers];
int i;
// Draw 3D flying saucers
for (i=0; i<nbSaucers; i++)
{
glPushMatrix();
glMultMatrixd(saucerPos[i].matrix());
qglColor(saucerColor[i]);
drawSaucer();
glPopMatrix();
}
// Draw the arrows
qglColor(foregroundColor());
startScreenCoordinatesSystem();
for (i=0; i<nbSaucers; i++)
{
glBegin(GL_POLYGON);
proj[i] = camera()->projectedCoordinatesOf(saucerPos[i].position());
// The small z offset makes the arrow slightly above the saucer, so that it is always visible
glVertex3fv(proj[i] + Vec(-55, 0, -0.001));
glVertex3fv(proj[i] + Vec(-17,-5, -0.001));
glVertex3fv(proj[i] + Vec( -5, 0, -0.001));
glVertex3fv(proj[i] + Vec(-17, 5, -0.001));
glEnd();
}
stopScreenCoordinatesSystem();
// Draw text id
glDisable(GL_LIGHTING);
for (i=0; i<nbSaucers; i++)
drawText(int(proj[i].x)-60, int(proj[i].y)+4, QString::number(i));
glEnable(GL_LIGHTING);
}
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