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#include <QtGui>

#include <QtOpenGL>

#include "glwidget.h"

#include "mainwindow.h"

MainWindow::MainWindow()

{

    centralWidget = new QWidget;

    setCentralWidget(centralWidget);

    glWidget = new GLWidget;

    pixmapLabel = new QLabel;

    glWidgetArea = new QScrollArea;

    glWidgetArea->setWidget(glWidget);

    glWidgetArea->setWidgetResizable(true);

    glWidgetArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

    glWidgetArea->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

    glWidgetArea->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);

    glWidgetArea->setMinimumSize(50, 50);

    pixmapLabelArea = new QScrollArea;

    pixmapLabelArea->setWidget(pixmapLabel);

    pixmapLabelArea->setSizePolicy(QSizePolicy::Ignored, QSizePolicy::Ignored);

    pixmapLabelArea->setMinimumSize(50, 50);

    xSlider = createSlider(SIGNAL(xRotationChanged(int)),

                           SLOT(setXRotation(int)));

    ySlider = createSlider(SIGNAL(yRotationChanged(int)),

                           SLOT(setYRotation(int)));

    zSlider = createSlider(SIGNAL(zRotationChanged(int)),

                           SLOT(setZRotation(int)));

    createActions();

    createMenus();

    QGridLayout *centralLayout = new QGridLayout;

    centralLayout->addWidget(glWidgetArea, 0, 0);

    centralLayout->addWidget(pixmapLabelArea, 0, 1);

    centralLayout->addWidget(xSlider, 1, 0, 1, 2);

    centralLayout->addWidget(ySlider, 2, 0, 1, 2);

    centralLayout->addWidget(zSlider, 3, 0, 1, 2);

    centralWidget->setLayout(centralLayout);

    xSlider->setValue(15 * 16);

    ySlider->setValue(345 * 16);

    zSlider->setValue(0 * 16);

    setWindowTitle(tr("Grabber"));

    resize(400, 300);

}

void MainWindow::renderIntoPixmap()

{

    QSize size = getSize();

    if (size.isValid()) {

        QPixmap pixmap = glWidget->renderPixmap(size.width(), size.height());

        setPixmap(pixmap);

    }

}

void MainWindow::grabFrameBuffer()

{

    QImage image = glWidget->grabFrameBuffer();

    setPixmap(QPixmap::fromImage(image));

}

void MainWindow::clearPixmap()

{

    setPixmap(QPixmap());

}

void MainWindow::about()

{

    QMessageBox::about(this, tr("About Grabber"),

            tr("The <b>Grabber</b> example demonstrates two approaches for "

               "rendering OpenGL into a Qt pixmap."));

}

void MainWindow::createActions()

{

    renderIntoPixmapAct = new QAction(tr("&Render into Pixmap..."), this);

    renderIntoPixmapAct->setShortcut(tr("Ctrl+R"));

    connect(renderIntoPixmapAct, SIGNAL(triggered()),

            this, SLOT(renderIntoPixmap()));

    grabFrameBufferAct = new QAction(tr("&Grab Frame Buffer"), this);

    grabFrameBufferAct->setShortcut(tr("Ctrl+G"));

    connect(grabFrameBufferAct, SIGNAL(triggered()),

            this, SLOT(grabFrameBuffer()));

    clearPixmapAct = new QAction(tr("&Clear Pixmap"), this);

    clearPixmapAct->setShortcut(tr("Ctrl+L"));

    connect(clearPixmapAct, SIGNAL(triggered()), this, SLOT(clearPixmap()));

    exitAct = new QAction(tr("E&xit"), this);

    exitAct->setShortcuts(QKeySequence::Quit);

    connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

    aboutAct = new QAction(tr("&About"), this);

    connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

    aboutQtAct = new QAction(tr("About &Qt"), this);

    connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));

}

void MainWindow::createMenus()

{

    fileMenu = menuBar()->addMenu(tr("&File"));

    fileMenu->addAction(renderIntoPixmapAct);

    fileMenu->addAction(grabFrameBufferAct);

    fileMenu->addAction(clearPixmapAct);

    fileMenu->addSeparator();

    fileMenu->addAction(exitAct);

    helpMenu = menuBar()->addMenu(tr("&Help"));

    helpMenu->addAction(aboutAct);

    helpMenu->addAction(aboutQtAct);

}

QSlider *MainWindow::createSlider(const char *changedSignal,

                                  const char *setterSlot)

{

    QSlider *slider = new QSlider(Qt::Horizontal);

    slider->setRange(0, 360 * 16);

    slider->setSingleStep(16);

    slider->setPageStep(15 * 16);

    slider->setTickInterval(15 * 16);

    slider->setTickPosition(QSlider::TicksRight);

    connect(slider, SIGNAL(valueChanged(int)), glWidget, setterSlot);

    connect(glWidget, changedSignal, slider, SLOT(setValue(int)));

    return slider;

}

void MainWindow::setPixmap(const QPixmap &pixmap)

{

    pixmapLabel->setPixmap(pixmap);

    QSize size = pixmap.size();

    if (size - QSize(1, 0) == pixmapLabelArea->maximumViewportSize())

        size -= QSize(1, 0);

    pixmapLabel->resize(size);

}

QSize MainWindow::getSize()

{

    bool ok;

    QString text = QInputDialog::getText(this, tr("Grabber"),

                                         tr("Enter pixmap size:"),

                                         QLineEdit::Normal,

                                         tr("%1 x %2").arg(glWidget->width())

                                                      .arg(glWidget->height()),

                                         &ok);

    if (!ok)

        return QSize();

    QRegExp regExp(tr("([0-9]+) *x *([0-9]+)"));

    if (regExp.exactMatch(text)) {

        int width = regExp.cap(1).toInt();

        int height = regExp.cap(2).toInt();

        if (width > 0 && width < 2048 && height > 0 && height < 2048)

            return QSize(width, height);

    }

    return glWidget->size();

}