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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 "constrainedFrame.h"
#if QT_VERSION >= 0x040000
# include <QKeyEvent>
#endif
using namespace qglviewer;
using namespace std;
static AxisPlaneConstraint::Type nextTranslationConstraintType(const AxisPlaneConstraint::Type& type)
{
switch (type)
{
case AxisPlaneConstraint::FREE : return AxisPlaneConstraint::PLANE; break;
case AxisPlaneConstraint::PLANE : return AxisPlaneConstraint::AXIS; break;
case AxisPlaneConstraint::AXIS : return AxisPlaneConstraint::FORBIDDEN; break;
case AxisPlaneConstraint::FORBIDDEN : return AxisPlaneConstraint::FREE; break;
default : return AxisPlaneConstraint::FREE;
}
}
static AxisPlaneConstraint::Type nextRotationConstraintType(const AxisPlaneConstraint::Type& type)
{
switch (type)
{
case AxisPlaneConstraint::FREE : return AxisPlaneConstraint::AXIS; break;
case AxisPlaneConstraint::AXIS : return AxisPlaneConstraint::FORBIDDEN; break;
case AxisPlaneConstraint::PLANE :
case AxisPlaneConstraint::FORBIDDEN : return AxisPlaneConstraint::FREE; break;
default : return AxisPlaneConstraint::FREE;
}
}
void Viewer::changeConstraint()
{
unsigned short previous = activeConstraint;
activeConstraint = (activeConstraint+1)%3;
constraints[activeConstraint]->setTranslationConstraintType(constraints[previous]->translationConstraintType());
constraints[activeConstraint]->setTranslationConstraintDirection(constraints[previous]->translationConstraintDirection());
constraints[activeConstraint]->setRotationConstraintType(constraints[previous]->rotationConstraintType());
constraints[activeConstraint]->setRotationConstraintDirection(constraints[previous]->rotationConstraintDirection());
frame->setConstraint(constraints[activeConstraint]);
}
void Viewer::init()
{
constraints[0] = new LocalConstraint();
constraints[1] = new WorldConstraint();
constraints[2] = new CameraConstraint(camera());
transDir = 0; // X direction
rotDir = 0; // X direction
activeConstraint = 0;
frame = new ManipulatedFrame();
setManipulatedFrame(frame);
frame->setConstraint(constraints[activeConstraint]);
#if QT_VERSION < 0x040000
// Preserve CAMERA bindings, see setHandlerKeyboardModifiers documentation.
setHandlerKeyboardModifiers(QGLViewer::CAMERA, Qt::AltButton);
// The frames can be move without any key pressed
setHandlerKeyboardModifiers(QGLViewer::FRAME, Qt::NoButton);
// The camera can always be moved with the Control key.
setHandlerKeyboardModifiers(QGLViewer::CAMERA, Qt::ControlButton);
setMouseBinding(Qt::ShiftButton | Qt::LeftButton, QGLViewer::FRAME, QGLViewer::ROTATE, false);
setMouseBinding(Qt::ShiftButton | Qt::RightButton, QGLViewer::FRAME, QGLViewer::TRANSLATE, false);
setMouseBinding(Qt::ShiftButton | Qt::MidButton, QGLViewer::FRAME, QGLViewer::ZOOM, false);
setWheelBinding(Qt::ShiftButton, QGLViewer::FRAME, QGLViewer::ZOOM, false);
#else
setHandlerKeyboardModifiers(QGLViewer::CAMERA, Qt::AltModifier);
setHandlerKeyboardModifiers(QGLViewer::FRAME, Qt::NoModifier);
setHandlerKeyboardModifiers(QGLViewer::CAMERA, Qt::ControlModifier);
setMouseBinding(Qt::ShiftModifier | Qt::LeftButton, QGLViewer::FRAME, QGLViewer::ROTATE, false);
setMouseBinding(Qt::ShiftModifier | Qt::RightButton, QGLViewer::FRAME, QGLViewer::TRANSLATE, false);
setMouseBinding(Qt::ShiftModifier | Qt::MidButton, QGLViewer::FRAME, QGLViewer::ZOOM, false);
setWheelBinding(Qt::ShiftModifier, QGLViewer::FRAME, QGLViewer::ZOOM, false);
#endif
setAxisIsDrawn();
setKeyDescription(Qt::Key_G, "Change translation constraint direction");
setKeyDescription(Qt::Key_D, "Change rotation constraint direction");
setKeyDescription(Qt::Key_Space, "Change constraint reference");
setKeyDescription(Qt::Key_T, "Change translation constraint type");
setKeyDescription(Qt::Key_R, "Change rotation constraint type");
restoreStateFromFile();
help();
}
void Viewer::draw()
{
glMultMatrixd(frame->matrix());
drawAxis(0.4);
const float scale = 0.3;
glScalef(scale, scale, scale);
const float nbSteps = 200.0;
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 = 1.0 - 0.8*ratio;
float r2 = 0.8 - 0.8*ratio;
float alt = ratio - 0.5;
const float nor = .5;
const float up = sqrt(1.0-nor*nor);
glColor3f(1-ratio, .2 , ratio);
glNormal3f(nor*c*scale, up*scale, nor*s*scale);
glVertex3f(r1*c, alt, r1*s);
glVertex3f(r2*c, alt+0.05, r2*s);
}
glEnd();
displayText();
}
void Viewer::keyPressEvent(QKeyEvent *e)
{
switch (e->key())
{
case Qt::Key_G : transDir = (transDir+1)%3; break;
case Qt::Key_D : rotDir = (rotDir+1)%3; break;
case Qt::Key_Space: changeConstraint(); break;
case Qt::Key_T :
constraints[activeConstraint]->setTranslationConstraintType(nextTranslationConstraintType(constraints[activeConstraint]->translationConstraintType()));
break;
case Qt::Key_R :
constraints[activeConstraint]->setRotationConstraintType(nextRotationConstraintType(constraints[activeConstraint]->rotationConstraintType()));
break;
default:
QGLViewer::keyPressEvent(e);
}
Vec dir(0.0,0.0,0.0);
dir[transDir] = 1.0;
constraints[activeConstraint]->setTranslationConstraintDirection(dir);
dir = Vec(0.0,0.0,0.0);
dir[rotDir] = 1.0;
constraints[activeConstraint]->setRotationConstraintDirection(dir);
updateGL();
}
void Viewer::displayType(const AxisPlaneConstraint::Type type, const int x, const int y, const char c)
{
QString text;
switch (type)
{
case AxisPlaneConstraint::FREE: text = QString("FREE (%1)").arg(c); break;
case AxisPlaneConstraint::PLANE: text = QString("PLANE (%1)").arg(c); break;
case AxisPlaneConstraint::AXIS: text = QString("AXIS (%1)").arg(c); break;
case AxisPlaneConstraint::FORBIDDEN: text = QString("FORBIDDEN (%1)").arg(c); break;
}
drawText(x, y, text);
}
void Viewer::displayDir(const unsigned short dir, const int x, const int y, const char c)
{
QString text;
switch (dir)
{
case 0: text = QString("X (%1)").arg(c); break;
case 1: text = QString("Y (%1)").arg(c); break;
case 2: text = QString("Z (%1)").arg(c); break;
}
drawText(x, y, text);
}
void Viewer::displayText()
{
qglColor(foregroundColor());
glDisable(GL_LIGHTING);
drawText(10, height()-30, "TRANSLATION :");
displayDir(transDir, 190, height()-30, 'G');
displayType(constraints[activeConstraint]->translationConstraintType(), 10, height()-60, 'T');
drawText(width()-220,height()-30, "ROTATION");
displayDir(rotDir, width()-100, height()-30, 'D');
displayType(constraints[activeConstraint]->rotationConstraintType(), width()-220, height()-60, 'R');
switch (activeConstraint)
{
case 0 : drawText(20,20, "Constraint direction defined w/r to LOCAL (SPACE)"); break;
case 1 : drawText(20,20, "Constraint direction defined w/r to WORLD (SPACE)"); break;
case 2 : drawText(20,20, "Constraint direction defined w/r to CAMERA (SPACE)"); break;
}
glEnable(GL_LIGHTING);
}
QString Viewer::helpString() const
{
QString text("<h2>C o n s t r a i n e d F r a m e</h2>");
text += "A manipulated frame can be constrained in its displacement.<br><br>";
text += "Try the different translation (press <b>G</b> and <b>T</b>) and rotation ";
text += "(<b>D</b> and <b>R</b>) constraints while moving the frame with the mouse.<br><br>";
text += "The constraints can be defined with respect to various coordinates";
text += "systems : press <b>Space</b> to switch.<br><br>";
text += "Press the <b>Control</b> key while moving the mouse to move the camera.<br>";
text += "Press the <b>Shift</b> key to temporally disable the constraint.<br><br>";
text += "You can easily define your own constraints to create a specific frame behavior.";
return text;
}
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