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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 "mouseGrabber.h"
using namespace qglviewer;
using namespace std;
void CameraPathPlayer::checkIfGrabsMouse(int x, int y, const Camera* const)
{
// Rectangular activation array - May have to be tune depending on your default font size
setGrabsMouse((x < 80) && (y<yPos()) && ((yPos()-y) < 16));
}
void Viewer::displayPlayers()
{
for (int i=0; i<nbPlayers_; ++i)
{
CameraPathPlayer* cpp = player_[i];
if (cpp)
{
QString s;
if (cpp->grabsMouse())
{
glColor3f(1,1,1);
if (camera()->keyFrameInterpolator(i)->numberOfKeyFrames() > 1)
s = "Play path F" + QString::number(i);
else
s = "Restore pos F" + QString::number(i);
}
else
{
glColor3f(0.6, 0.6, 0.6);
if (camera()->keyFrameInterpolator(i)->numberOfKeyFrames() > 1)
s = "Path F" + QString::number(i);
else
s = "Pos F" + QString::number(i);
}
drawText(10, cpp->yPos()-3, s);
}
}
}
void Viewer::updatePlayers()
{
for (int i=0; i<nbPlayers_; ++i)
{
// Check if CameraPathPlayer is still valid
if ((player_[i]) && (!camera()->keyFrameInterpolator(i)))
{
delete player_[i];
player_[i] = NULL;
}
// Or add it if needed
if ((camera()->keyFrameInterpolator(i)) && (!player_[i]))
player_[i] = new CameraPathPlayer(i);
}
}
void Viewer::init()
{
// Absolutely needed for MouseGrabber
setMouseTracking(true);
// In order to make the manipulatedFrame displacements clearer
setAxisIsDrawn();
// Initialize the CameraPathPlayer MouseGrabber array
nbPlayers_ = 12;
player_ = new CameraPathPlayer*[nbPlayers_];
for (int i=0; i<nbPlayers_; ++i)
player_[i] = NULL;
// Create a scene with several spirals.
const int nbSpirals = 7;
for (int i = -nbSpirals/2; i<=nbSpirals/2; ++i)
{
Spiral s;
s.setPosition(Vec(1.8f*i/nbSpirals, 0.0f, 0.0f));
spiral_.push_back(s);
}
restoreStateFromFile();
help();
}
void Viewer::draw()
{
#if QT_VERSION < 0x040000
for (QValueVector<Spiral>::const_iterator it=spiral_.begin(), end=spiral_.end(); it != end; ++it)
#else
for (QList<Spiral>::const_iterator it=spiral_.begin(), end=spiral_.end(); it != end; ++it)
#endif
(*it).draw();
updatePlayers();
glDisable(GL_LIGHTING);
displayPlayers();
glEnable(GL_LIGHTING);
}
QString Viewer::helpString() const
{
QString text("<h2>M o u s e G r a b b e r </h2>");
text += "This example illustrates the use of <i>MouseGrabber</i>, which is an abstract ";
text += "class for objects that react (usually when the mouse hovers over them).<br><br>";
text += "Define new camera paths (or positions) using <b>Alt</b>+[<b>F1</b>-<b>F12</b>]. ";
text += "New <i>MouseGrabbers</i> are then created and displayed in the upper left corner. ";
text += "Note how they react when the mouse hovers, and click them to play the associated path.<br><br>";
text += "<i>ManipulatedFrame</i>, such as the ones which define the spirals' positions, are ";
text += "also <i>MouseGrabbers</i>. When the mouse is close to the spiral center, the <i>ManipulatedFrame</i> ";
text += "will grab to mouse click (as if the <b>Control</b> key was pressed). This is very convenient ";
text += "to intuitively move scene objects (such as lights) without any key or GUI interaction.<br><br>";
text += "Note that <code>setMouseTracking()</code> must be enabled to use <i>MouseGrabbers</i>.";
return text;
}
void Spiral::draw() const
{
glPushMatrix();
glMultMatrixd(mf_.matrix());
// Draw a spiral
const float nbSteps = 100.0;
glBegin(GL_QUAD_STRIP);
for (float i=0; i<nbSteps; ++i)
{
float ratio = i/nbSteps;
float angle = 21.0*ratio;
float c = cos(angle);
float s = sin(angle);
float r1 = 0.2 - 0.15*ratio;
float r2 = 0.16 - 0.15*ratio;
float alt = 0.2f * (ratio - 0.5);
const float nor = .5;
const float up = sqrt(1.0-nor*nor);
if (mf_.grabsMouse())
glColor3f(1-ratio, 0.8f , ratio/2.0);
else
glColor3f(1-ratio, 0.2f , ratio);
glNormal3f(nor*c, up, nor*s);
glVertex3f(r1*c, alt, r1*s);
glVertex3f(r2*c, alt+0.01, r2*s);
}
glEnd();
glPopMatrix();
}
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