/****************************************************************************
 **
 ** Copyright (C) 2005-2007 Trolltech ASA. All rights reserved.
 **
 ** This file is part of the demonstration applications of the Qt Toolkit.
 **
 ** This file may be used under the terms of the GNU General Public
 ** License version 2.0 as published by the Free Software Foundation
 ** and appearing in the file LICENSE.GPL included in the packaging of
 ** this file.  Please review the following information to ensure GNU
 ** General Public Licensing requirements will be met:
 ** http://trolltech.com/products/qt/licenses/licensing/opensource/
 **
 ** If you are unsure which license is appropriate for your use, please
 ** review the following information:
 ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
 ** or contact the sales department at sales@trolltech.com.
 **
 ** In addition, as a special exception, Trolltech gives you certain
 ** additional rights. These rights are described in the Trolltech GPL
 ** Exception version 1.0, which can be found at
 ** http://www.trolltech.com/products/qt/gplexception/ and in the file
 ** GPL_EXCEPTION.txt in this package.
 **
 ** In addition, as a special exception, Trolltech, as the sole copyright
 ** holder for Qt Designer, grants users of the Qt/Eclipse Integration
 ** plug-in the right for the Qt/Eclipse Integration to link to
 ** functionality provided by Qt Designer and its related libraries.
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 ** Trolltech ASA (c) 2007
 **
 ** 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 "view.h"
 
 #include <QtGui>
 #ifndef QT_NO_OPENGL
 #include <QtOpenGL>
 #endif
 
 #include <math.h>
 
 View::View(const QString &name, QWidget *parent)
     : QFrame(parent)
 {
     setFrameStyle(Sunken | StyledPanel);
     graphicsView = new QGraphicsView;
     graphicsView->setRenderHint(QPainter::Antialiasing, false);
     graphicsView->setDragMode(QGraphicsView::RubberBandDrag);
     graphicsView->setViewportUpdateMode(QGraphicsView::SmartViewportUpdate);
 
     int size = style()->pixelMetric(QStyle::PM_ToolBarIconSize);
     QSize iconSize(size, size);
 
     QToolButton *zoomInIcon = new QToolButton;
     zoomInIcon->setAutoRepeat(true);
     zoomInIcon->setAutoRepeatInterval(33);
     zoomInIcon->setAutoRepeatDelay(0);
     zoomInIcon->setIcon(QPixmap(":/zoomin.png"));
     zoomInIcon->setIconSize(iconSize);
     QToolButton *zoomOutIcon = new QToolButton;
     zoomOutIcon->setAutoRepeat(true);
     zoomOutIcon->setAutoRepeatInterval(33);
     zoomOutIcon->setAutoRepeatDelay(0);
     zoomOutIcon->setIcon(QPixmap(":/zoomout.png"));
     zoomOutIcon->setIconSize(iconSize);
     zoomSlider = new QSlider;
     zoomSlider->setMinimum(0);
     zoomSlider->setMaximum(500);
     zoomSlider->setValue(250);
     zoomSlider->setTickPosition(QSlider::TicksRight);
 
     // Zoom slider layout
     QVBoxLayout *zoomSliderLayout = new QVBoxLayout;
     zoomSliderLayout->addWidget(zoomInIcon);
     zoomSliderLayout->addWidget(zoomSlider);
     zoomSliderLayout->addWidget(zoomOutIcon);
 
     QToolButton *rotateLeftIcon = new QToolButton;
     rotateLeftIcon->setIcon(QPixmap(":/rotateleft.png"));
     rotateLeftIcon->setIconSize(iconSize);
     QToolButton *rotateRightIcon = new QToolButton;
     rotateRightIcon->setIcon(QPixmap(":/rotateright.png"));
     rotateRightIcon->setIconSize(iconSize);
     rotateSlider = new QSlider;
     rotateSlider->setOrientation(Qt::Horizontal);
     rotateSlider->setMinimum(-360);
     rotateSlider->setMaximum(360);
     rotateSlider->setValue(0);
     rotateSlider->setTickPosition(QSlider::TicksBelow);
 
     // Rotate slider layout
     QHBoxLayout *rotateSliderLayout = new QHBoxLayout;
     rotateSliderLayout->addWidget(rotateLeftIcon);
     rotateSliderLayout->addWidget(rotateSlider);
     rotateSliderLayout->addWidget(rotateRightIcon);
 
     resetButton = new QToolButton;
     resetButton->setText(tr("0"));
     resetButton->setEnabled(false);
 
     // Label layout
     QHBoxLayout *labelLayout = new QHBoxLayout;
     label = new QLabel(name);
     antialiasButton = new QToolButton;
     antialiasButton->setText(tr("Antialiasing"));
     antialiasButton->setCheckable(true);
     antialiasButton->setChecked(false);
     openGlButton = new QToolButton;
     openGlButton->setText(tr("OpenGL"));
     openGlButton->setCheckable(true);
 #ifndef QT_NO_OPENGL
     openGlButton->setEnabled(QGLFormat::hasOpenGL());
 #else
     openGlButton->setEnabled(false);
 #endif
     printButton = new QToolButton;
     printButton->setIcon(QIcon(QPixmap(":/fileprint.png")));
 
     labelLayout->addWidget(label);
     labelLayout->addStretch();
     labelLayout->addWidget(antialiasButton);
     labelLayout->addWidget(openGlButton);
     labelLayout->addWidget(printButton);
 
     QGridLayout *topLayout = new QGridLayout;
     topLayout->addLayout(labelLayout, 0, 0);
     topLayout->addWidget(graphicsView, 1, 0);
     topLayout->addLayout(zoomSliderLayout, 1, 1);
     topLayout->addLayout(rotateSliderLayout, 2, 0);
     topLayout->addWidget(resetButton, 2, 1);
     setLayout(topLayout);
 
     connect(resetButton, SIGNAL(clicked()), this, SLOT(resetView()));
     connect(zoomSlider, SIGNAL(valueChanged(int)), this, SLOT(setupMatrix()));
     connect(rotateSlider, SIGNAL(valueChanged(int)), this, SLOT(setupMatrix()));
     connect(graphicsView->verticalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(setResetButtonEnabled()));
     connect(graphicsView->horizontalScrollBar(), SIGNAL(valueChanged(int)), this, SLOT(setResetButtonEnabled()));
     connect(antialiasButton, SIGNAL(toggled(bool)), this, SLOT(toggleAntialiasing()));
     connect(openGlButton, SIGNAL(toggled(bool)), this, SLOT(toggleOpenGL()));
     connect(rotateLeftIcon, SIGNAL(clicked()), this, SLOT(rotateLeft()));
     connect(rotateRightIcon, SIGNAL(clicked()), this, SLOT(rotateRight()));
     connect(zoomInIcon, SIGNAL(clicked()), this, SLOT(zoomIn()));
     connect(zoomOutIcon, SIGNAL(clicked()), this, SLOT(zoomOut()));
     connect(printButton, SIGNAL(clicked()), this, SLOT(print()));
 
     setupMatrix();
 }
 
 QGraphicsView *View::view() const
 {
     return graphicsView;
 }
 
 void View::resetView()
 {
     zoomSlider->setValue(250);
     rotateSlider->setValue(0);
     setupMatrix();
     graphicsView->ensureVisible(QRectF(0, 0, 0, 0));
 
     resetButton->setEnabled(false);
 }
 
 void View::setResetButtonEnabled()
 {
     resetButton->setEnabled(true);
 }
 
 void View::setupMatrix()
 {
     qreal scale = ::pow(2.0, (zoomSlider->value() - 250) / 50.0);
 
     QMatrix matrix;
     matrix.scale(scale, scale);
     matrix.rotate(rotateSlider->value());
 
     graphicsView->setMatrix(matrix);
     setResetButtonEnabled();
 }
 
 void View::toggleOpenGL()
 {
 #ifndef QT_NO_OPENGL
     graphicsView->setViewport(openGlButton->isChecked() ? new QGLWidget(QGLFormat(QGL::SampleBuffers)) : new QWidget);
 #endif
 }
 
 void View::toggleAntialiasing()
 {
     graphicsView->setRenderHint(QPainter::Antialiasing, antialiasButton->isChecked());
 }
 
 void View::print()
 {
     QPrinter printer;
     QPrintDialog dialog(&printer, this);
     if (dialog.exec() == QDialog::Accepted) {
         QPainter painter(&printer);
         graphicsView->render(&painter);
     }
 }
 
 void View::zoomIn()
 {
     zoomSlider->setValue(zoomSlider->value() + 1);
 }
 
 void View::zoomOut()
 {
     zoomSlider->setValue(zoomSlider->value() - 1);
 }
 
 void View::rotateLeft()
 {
     rotateSlider->setValue(rotateSlider->value() - 10);
 }
 
 void View::rotateRight()
 {
     rotateSlider->setValue(rotateSlider->value() + 10);
 }