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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 "viewer.h"
#include "standardCamera.h"
#if QT_VERSION >= 0x040000
# include <QKeyEvent>
#endif
using namespace std;
using namespace qglviewer;
Viewer::Viewer(StandardCamera* nfc)
{
// Change the camera.
Camera* c = camera();
setCamera(nfc);
delete c;
}
// Draws a spiral
void Viewer::draw()
{
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();
}
void Viewer::init()
{
// Restore previous viewer state.
if (!restoreStateFromFile())
showEntireScene();
setKeyDescription(Qt::Key_T, "Toggles camera type (perspective or orthographic)");
setKeyDescription(Qt::Key_M, "Toggles camera mode (standard or QGLViewer)");
setMouseBindingDescription(Qt::SHIFT + Qt::MidButton, "Change frustum size (for standard camera in orthographic mode)");
// Display help window.
help();
}
void Viewer::showMessage()
{
QString std = ((StandardCamera*)camera())->isStandard()?"Standard camera":"QGLViewer camera";
QString type = camera()->type() == Camera::PERSPECTIVE?"Perspective":"Orthographic";
displayMessage(std + " - " + type);
emit cameraChanged();
}
void Viewer::keyPressEvent(QKeyEvent *e)
{
if (e->key() == Qt::Key_M) {
// 'M' changes mode : standard or QGLViewer camera
((StandardCamera*)camera())->toggleMode();
showMessage();
} else
if (e->key() == Qt::Key_T) {
// 'T' changes the projection type : perspective or orthogonal
if (camera()->type() == Camera::ORTHOGRAPHIC)
camera()->setType(Camera::PERSPECTIVE);
else
camera()->setType(Camera::ORTHOGRAPHIC);
showMessage();
} else
QGLViewer::keyPressEvent(e);
}
void Viewer::wheelEvent(QWheelEvent *e)
{
if ((camera()->type() == Camera::ORTHOGRAPHIC) && (((StandardCamera*)camera())->isStandard()) &&
#if QT_VERSION >= 0x040000
(e->modifiers() & Qt::ShiftModifier))
#else
(e->state() & Qt::ShiftButton))
#endif
{
((StandardCamera*)camera())->changeOrthoFrustumSize(e->delta());
emit cameraChanged();
updateGL();
}
else
QGLViewer::wheelEvent(e);
}
QString Viewer::helpString() const
{
QString text("<h2>S t a n d a r d C a m e r a</h2>");
text += "An overloaded <code>Camera</code> class is used, that reproduces the 'standard' OpenGL settings.<br><br>";
text += "With this camera, the near and (resp. far) plane distance is set to a very small (resp. very large) value. ";
text += "With the orthographic camera type, the frustum dimensions are fixed. Use <code>Shift</code> and the mouse wheel to change them.<br><br>";
text += "On the other hand, the QGLViewer camera fits the near and far distances to the scene radius. ";
text += "Fine tuning is available using <code>zClippingCoefficient()</code> and <code>zNearCoefficient()</code>. ";
text += "However, visual results do not seem to be impacted by this zBuffer fitted range.<br><br>";
text += "The QGLViewer camera also adapts the orthographic frustum dimensions to the distance to the <code>revolveAroundPoint()</code> to mimic a perspective camera. ";
text += "Since this behavior may not be needed, this example shows how to override it.<br><br>";
text += "The second viewer displays the first one's camera to show its configuration.<br><br>";
text += "Use <b>M</b> to switch between 'standard' and QGLViewer camera behavior.<br>";
text += "Use <b>T</b> to switch between perspective and orthographic camera type.<br><br>";
text += "Use <b>Shift+wheel</b> to change standard camera orthographic size.";
return text;
}
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