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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 "keyFrames.h"
#if QT_VERSION >= 0x040000
# include <QKeyEvent>
#endif
using namespace qglviewer;
using namespace std;
Viewer::Viewer()
: nbKeyFrames(4)
{
restoreStateFromFile();
// myFrame is the Frame that will be interpolated.
Frame* myFrame = new Frame();
// Set myFrame as the KeyFrameInterpolator interpolated Frame.
kfi_.setFrame(myFrame);
kfi_.setLoopInterpolation();
// An array of manipulated (key) frames.
keyFrame_ = new ManipulatedFrame*[nbKeyFrames];
// Create an initial path
for (int i=0; i<nbKeyFrames; i++)
{
keyFrame_[i] = new ManipulatedFrame();
keyFrame_[i]->setPosition(-1.0 + 2.0*i/(nbKeyFrames-1), 0.0, 0.0);
kfi_.addKeyFrame(keyFrame_[i]);
}
currentKF_ = 0;
setManipulatedFrame(keyFrame_[currentKF_]);
// Enable direct frame manipulation when the mouse hovers.
setMouseTracking(true);
setKeyDescription(Qt::Key_Plus, "Increases interpolation speed");
setKeyDescription(Qt::Key_Minus, "Decreases interpolation speed");
setKeyDescription(Qt::Key_Left, "Selects previous key frame");
setKeyDescription(Qt::Key_Right, "Selects next key frame");
setKeyDescription(Qt::Key_Return, "Starts/stops interpolation");
help();
connect(&kfi_, SIGNAL(interpolated()), SLOT(updateGL()));
kfi_.startInterpolation();
}
QString Viewer::helpString() const
{
QString text("<h2>K e y F r a m e s</h2>");
text += "A <i>KeyFrameInterpolator</i> holds an interpolated path defined by key frames. ";
text += "It can then smoothly make its associed frame follow that path. Key frames can interactively be manipulated, even ";
text += "during interpolation.<br><br>";
text += "Note that the camera holds 12 such keyFrameInterpolators, binded to F1-F12. Press <b>Alt+Fx</b> to define new key ";
text += "frames, and then press <b>Fx</b> to make the camera follow the path. Press <b>C</b> to visualize these paths.<br><br>";
text += "<b>+/-</b> changes the interpolation speed. Negative values are allowed.<br><br>";
text += "<b>Return</b> starts-stops the interpolation.<br><br>";
text += "Use the left and right arrows to change the manipulated KeyFrame. ";
text += "Press <b>Control</b> to move it or simply hover over it.";
return text;
}
void Viewer::keyPressEvent(QKeyEvent *e)
{
switch (e->key())
{
case Qt::Key_Left :
currentKF_ = (currentKF_+nbKeyFrames-1) % nbKeyFrames;
setManipulatedFrame(keyFrame_[currentKF_]);
updateGL();
break;
case Qt::Key_Right :
currentKF_ = (currentKF_+1) % nbKeyFrames;
setManipulatedFrame(keyFrame_[currentKF_]);
updateGL();
break;
case Qt::Key_Return :
kfi_.toggleInterpolation();
break;
case Qt::Key_Plus :
kfi_.setInterpolationSpeed(kfi_.interpolationSpeed()+0.25);
break;
case Qt::Key_Minus :
kfi_.setInterpolationSpeed(kfi_.interpolationSpeed()-0.25);
break;
// case Qt::Key_C :
// kfi_.setClosedPath(!kfi_.closedPath());
// break;
default:
QGLViewer::keyPressEvent(e);
}
}
void Viewer::draw()
{
// Draw interpolated frame
glPushMatrix();
glMultMatrixd(kfi_.frame()->matrix());
drawAxis(0.3);
glPopMatrix();
kfi_.drawPath(5, 10);
for (int i=0; i<nbKeyFrames; ++i)
{
glPushMatrix();
glMultMatrixd(kfi_.keyFrame(i).matrix());
if ((i == currentKF_) || (keyFrame_[i]->grabsMouse()))
drawAxis(0.4);
else
drawAxis(0.2);
glPopMatrix();
}
}
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