/****************************************************************************
Copyright (C) 2002-2008 Gilles Debunne. All rights reserved.
This file is part of the QGLViewer library version 2.3.9.
http://www.libqglviewer.com - contact@libqglviewer.com
This file may be used under the terms of the GNU General Public License
versions 2.0 or 3.0 as published by the Free Software Foundation and
appearing in the LICENSE file included in the packaging of this file.
In addition, as a special exception, Gilles Debunne gives you certain
additional rights, described in the file GPL_EXCEPTION in this package.
libQGLViewer uses dual licensing. Commercial/proprietary software must
purchase a libQGLViewer Commercial License.
This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*****************************************************************************/
#include "multiSelect.h"
#include "manipulatedFrameSetConstraint.h"
#if QT_VERSION >= 0x040000
# include <QMouseEvent>
#endif
using namespace qglviewer;
Viewer::Viewer()
{
selectionMode_ = NONE;
// Fill the scene with objects positionned on a regular grid.
// Consider increasing selectBufferSize() if you use more objects.
const int nb = 10;
for (int i=-nb; i<=nb; ++i)
for (int j=-nb; j<=nb; ++j)
{
Object* o = new Object();
o->frame.setPosition(Vec(i/float(nb), j/float(nb), 0.0));
#if QT_VERSION < 0x040000
// How could they sell this ?
objects_.resize(objects_.size()+1);
objects_.insert(objects_.size()-1, o);
#else
objects_.append(o);
#endif
}
}
void Viewer::init()
{
// A ManipulatedFrameSetConstraint will apply displacements to the selection
setManipulatedFrame(new ManipulatedFrame());
manipulatedFrame()->setConstraint(new ManipulatedFrameSetConstraint());
// Used to display semi-transparent relection rectangle
glBlendFunc(GL_ONE, GL_ONE);
restoreStateFromFile();
help();
}
QString Viewer::helpString() const
{
QString text("<h2>m u l t i S e l e c t </h2>");
text += "This example illustrates an application of the <code>select()</code> function that ";
text += "enables the selection of several objects.<br><br>";
text += "Object selection is preformed using the left mouse button. Press <b>Shift</b> to add objects ";
text += "to the selection, and <b>Alt</b> to remove objects from the selection.<br><br>";
text += "Individual objects (click on them) as well as rectangular regions (click and drag mouse) can be selected. ";
text += "To do this, the selection region size is modified and the <code>endSelection()</code> function ";
text += "has been overloaded so that <i>all</i> the objects of the region are taken into account ";
text += "(the default implementation only selects the closest object).<br><br>";
text += "The selected objects can then be manipulated by pressing the <b>Control</b> key. ";
text += "Other set operations (parameter edition, deletion...) can also easily be applied to the selected objects.";
return text;
}
// D r a w i n g f u n c t i o n
void Viewer::draw()
{
// Draws selected objects only.
glColor3f(0.9f, 0.3f, 0.3f);
#if QT_VERSION < 0x040000
for (QValueList<int>::const_iterator it=selection_.begin(), end=selection_.end(); it != end; ++it)
#else
for (QList<int>::const_iterator it=selection_.begin(), end=selection_.end(); it != end; ++it)
#endif
objects_.at(*it)->draw();
// Draws all the objects. Selected ones are not repainted because of GL depth test.
glColor3f(0.8f, 0.8f, 0.8f);
for (int i=0; i<int(objects_.size()); i++)
objects_.at(i)->draw();
// Draws manipulatedFrame (the set's rotation center)
if (manipulatedFrame()->isManipulated())
{
glPushMatrix();
glMultMatrixd(manipulatedFrame()->matrix());
drawAxis(0.5);
glPopMatrix();
}
// Draws rectangular selection area. Could be done in postDraw() instead.
if (selectionMode_ != NONE)
drawSelectionRectangle();
}
// C u s t o m i z e d m o u s e e v e n t s
void Viewer::mousePressEvent(QMouseEvent* e)
{
// Start selection. Mode is ADD with Shift key and TOGGLE with Alt key.
rectangle_ = QRect(e->pos(), e->pos());
#if QT_VERSION < 0x040000
if ((e->button() == Qt::LeftButton) && (e->state() == Qt::ShiftButton))
selectionMode_ = ADD;
else
if ((e->button() == Qt::LeftButton) && (e->state() == Qt::AltButton))
selectionMode_ = REMOVE;
else
{
if (e->state() == Qt::ControlButton)
#else
if ((e->button() == Qt::LeftButton) && (e->modifiers() == Qt::ShiftModifier))
selectionMode_ = ADD;
else
if ((e->button() == Qt::LeftButton) && (e->modifiers() == Qt::AltModifier))
selectionMode_ = REMOVE;
else
{
if (e->modifiers() == Qt::ControlModifier)
#endif
startManipulation();
QGLViewer::mousePressEvent(e);
}
}
void Viewer::mouseMoveEvent(QMouseEvent* e)
{
if (selectionMode_ != NONE)
{
// Updates rectangle_ coordinates and redraws rectangle
#if QT_VERSION < 0x030000
rectangle_.setX(e->x());
rectangle_.setY(e->y());
#else
rectangle_.setBottomRight(e->pos());
#endif
updateGL();
}
else
QGLViewer::mouseMoveEvent(e);
}
void Viewer::mouseReleaseEvent(QMouseEvent* e)
{
if (selectionMode_ != NONE)
{
// Actual selection on the rectangular area.
// Possibly swap left/right and top/bottom to make rectangle_ valid.
#if QT_VERSION < 0x040000
rectangle_ = rectangle_.normalize();
#else
rectangle_ = rectangle_.normalized();
#endif
// Define selection window dimensions
setSelectRegionWidth(rectangle_.width());
setSelectRegionHeight(rectangle_.height());
// Compute rectangle center and perform selection
select(rectangle_.center());
// Update display to show new selected objects
updateGL();
}
else
QGLViewer::mouseReleaseEvent(e);
}
// C u s t o m i z e d s e l e c t i o n p r o c e s s
void Viewer::drawWithNames()
{
for (int i=0; i<int(objects_.size()); i++)
{
glPushName(i);
objects_.at(i)->draw();
glPopName();
}
}
void Viewer::endSelection(const QPoint&)
{
// Flush GL buffers
glFlush();
// Get the number of objects that were seen through the pick matrix frustum. Reset GL_RENDER mode.
GLint nbHits = glRenderMode(GL_RENDER);
if (nbHits > 0)
{
// Interpret results : each object created 4 values in the selectBuffer().
// (selectBuffer())[4*i+3] is the id pushed on the stack.
for (int i=0; i<nbHits; ++i)
switch (selectionMode_)
{
case ADD : addIdToSelection((selectBuffer())[4*i+3]); break;
case REMOVE : removeIdFromSelection((selectBuffer())[4*i+3]); break;
default : break;
}
}
selectionMode_ = NONE;
}
void Viewer::startManipulation()
{
Vec averagePosition;
ManipulatedFrameSetConstraint* mfsc = (ManipulatedFrameSetConstraint*)(manipulatedFrame()->constraint());
mfsc->clearSet();
#if QT_VERSION < 0x040000
for (QValueList<int>::const_iterator it=selection_.begin(), end=selection_.end(); it != end; ++it)
#else
for (QList<int>::const_iterator it=selection_.begin(), end=selection_.end(); it != end; ++it)
#endif
{
mfsc->addObjectToSet(objects_[*it]);
averagePosition += objects_[*it]->frame.position();
}
if (selection_.size() > 0)
manipulatedFrame()->setPosition(averagePosition / selection_.size());
}
// S e l e c t i o n t o o l s
void Viewer::addIdToSelection(int id)
{
if (!selection_.contains(id))
selection_.push_back(id);
}
void Viewer::removeIdFromSelection(int id)
{
#if QT_VERSION < 0x040000
selection_.remove(id);
#else
selection_.removeAll(id);
#endif
}
void Viewer::drawSelectionRectangle() const
{
startScreenCoordinatesSystem();
glDisable(GL_LIGHTING);
glEnable(GL_BLEND);
glColor4f(0.0, 0.0, 0.3f, 0.3f);
glBegin(GL_QUADS);
glVertex2i(rectangle_.left(), rectangle_.top());
glVertex2i(rectangle_.right(), rectangle_.top());
glVertex2i(rectangle_.right(), rectangle_.bottom());
glVertex2i(rectangle_.left(), rectangle_.bottom());
glEnd();
glLineWidth(2.0);
glColor4f(0.4f, 0.4f, 0.5f, 0.5f);
glBegin(GL_LINE_LOOP);
glVertex2i(rectangle_.left(), rectangle_.top());
glVertex2i(rectangle_.right(), rectangle_.top());
glVertex2i(rectangle_.right(), rectangle_.bottom());
glVertex2i(rectangle_.left(), rectangle_.bottom());
glEnd();
glDisable(GL_BLEND);
glEnable(GL_LIGHTING);
stopScreenCoordinatesSystem();
}
