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# view.cpp Example File
demos/chip/view.cpp

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     ** This file is part of the demonstration applications of the Qt Toolkit.
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     #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);
     }