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window.cpp Example File
painting/basicdrawing/window.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2005-2005 Trolltech AS. All rights reserved.
    **
    ** This file is part of the documentation 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://www.trolltech.com/products/qt/opensource.html
    **
    ** If you are unsure which license is appropriate for your use, please
    ** review the following information:
    ** http://www.trolltech.com/products/qt/licensing.html or contact the
    ** sales department at sales@trolltech.com.
    **
    ** 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 <QtGui>

    #include "renderarea.h"
    #include "window.h"

    const int IdRole = Qt::UserRole;

    Window::Window()
    {
        renderArea = new RenderArea;

        shapeComboBox = new QComboBox;
        shapeComboBox->addItem(tr("Rectangle"), RenderArea::Rect);
        shapeComboBox->addItem(tr("Round Rectangle"), RenderArea::RoundRect);
        shapeComboBox->addItem(tr("Ellipse"), RenderArea::Ellipse);
        shapeComboBox->addItem(tr("Pie"), RenderArea::Pie);
        shapeComboBox->addItem(tr("Chord"), RenderArea::Chord);
        shapeComboBox->addItem(tr("Polygon"), RenderArea::Polygon);
        shapeComboBox->addItem(tr("Path"), RenderArea::Path);
        shapeComboBox->addItem(tr("Line"), RenderArea::Line);
        shapeComboBox->addItem(tr("Polyline"), RenderArea::Polyline);
        shapeComboBox->addItem(tr("Arc"), RenderArea::Arc);
        shapeComboBox->addItem(tr("Points"), RenderArea::Points);
        shapeComboBox->addItem(tr("Text"), RenderArea::Text);
        shapeComboBox->addItem(tr("Pixmap"), RenderArea::Pixmap);

        shapeLabel = new QLabel(tr("&Shape:"));
        shapeLabel->setBuddy(shapeComboBox);

        penWidthSpinBox = new QSpinBox;
        penWidthSpinBox->setRange(0, 20);

        penWidthLabel = new QLabel(tr("Pen &Width:"));
        penWidthLabel->setBuddy(penWidthSpinBox);

        penStyleComboBox = new QComboBox;
        penStyleComboBox->addItem(tr("Solid"), Qt::SolidLine);
        penStyleComboBox->addItem(tr("Dash"), Qt::DashLine);
        penStyleComboBox->addItem(tr("Dot"), Qt::DotLine);
        penStyleComboBox->addItem(tr("Dash Dot"), Qt::DashDotLine);
        penStyleComboBox->addItem(tr("Dash Dot Dot"), Qt::DashDotDotLine);
        penStyleComboBox->addItem(tr("None"), Qt::NoPen);

        penStyleLabel = new QLabel(tr("&Pen Style:"));
        penStyleLabel->setBuddy(penStyleComboBox);

        penCapComboBox = new QComboBox;
        penCapComboBox->addItem(tr("Flat"), Qt::FlatCap);
        penCapComboBox->addItem(tr("Square"), Qt::SquareCap);
        penCapComboBox->addItem(tr("Round"), Qt::RoundCap);

        penCapLabel = new QLabel(tr("Pen &Cap:"));
        penCapLabel->setBuddy(penCapComboBox);

        penJoinComboBox = new QComboBox;
        penJoinComboBox->addItem(tr("Miter"), Qt::MiterJoin);
        penJoinComboBox->addItem(tr("Bevel"), Qt::BevelJoin);
        penJoinComboBox->addItem(tr("Round"), Qt::RoundJoin);

        penJoinLabel = new QLabel(tr("Pen &Join:"));
        penJoinLabel->setBuddy(penJoinComboBox);

        brushStyleComboBox = new QComboBox;
        brushStyleComboBox->addItem(tr("Linear Gradient"),
                Qt::LinearGradientPattern);
        brushStyleComboBox->addItem(tr("Radial Gradient"),
                Qt::RadialGradientPattern);
        brushStyleComboBox->addItem(tr("Conical Gradient"),
                Qt::ConicalGradientPattern);
        brushStyleComboBox->addItem(tr("Texture"), Qt::TexturePattern);
        brushStyleComboBox->addItem(tr("Solid"), Qt::SolidPattern);
        brushStyleComboBox->addItem(tr("Horizontal"), Qt::HorPattern);
        brushStyleComboBox->addItem(tr("Vertical"), Qt::VerPattern);
        brushStyleComboBox->addItem(tr("Cross"), Qt::CrossPattern);
        brushStyleComboBox->addItem(tr("Backward Diagonal"), Qt::BDiagPattern);
        brushStyleComboBox->addItem(tr("Forward Diagonal"), Qt::FDiagPattern);
        brushStyleComboBox->addItem(tr("Diagonal Cross"), Qt::DiagCrossPattern);
        brushStyleComboBox->addItem(tr("Dense 1"), Qt::Dense1Pattern);
        brushStyleComboBox->addItem(tr("Dense 2"), Qt::Dense2Pattern);
        brushStyleComboBox->addItem(tr("Dense 3"), Qt::Dense3Pattern);
        brushStyleComboBox->addItem(tr("Dense 4"), Qt::Dense4Pattern);
        brushStyleComboBox->addItem(tr("Dense 5"), Qt::Dense5Pattern);
        brushStyleComboBox->addItem(tr("Dense 6"), Qt::Dense6Pattern);
        brushStyleComboBox->addItem(tr("Dense 7"), Qt::Dense7Pattern);
        brushStyleComboBox->addItem(tr("None"), Qt::NoBrush);

        brushStyleLabel = new QLabel(tr("&Brush Style:"));
        brushStyleLabel->setBuddy(brushStyleComboBox);

        antialiasingCheckBox = new QCheckBox(tr("&Antialiasing"));
        transformationsCheckBox = new QCheckBox(tr("&Transformations"));

        connect(shapeComboBox, SIGNAL(activated(int)),
                this, SLOT(shapeChanged()));
        connect(penWidthSpinBox, SIGNAL(valueChanged(int)),
                this, SLOT(penChanged()));
        connect(penStyleComboBox, SIGNAL(activated(int)),
                this, SLOT(penChanged()));
        connect(penCapComboBox, SIGNAL(activated(int)),
                this, SLOT(penChanged()));
        connect(penJoinComboBox, SIGNAL(activated(int)),
                this, SLOT(penChanged()));
        connect(brushStyleComboBox, SIGNAL(activated(int)),
                this, SLOT(brushChanged()));
        connect(antialiasingCheckBox, SIGNAL(toggled(bool)),
                renderArea, SLOT(setAntialiased(bool)));
        connect(transformationsCheckBox, SIGNAL(toggled(bool)),
                renderArea, SLOT(setTransformed(bool)));

        QHBoxLayout *checkBoxLayout = new QHBoxLayout;
        checkBoxLayout->addWidget(antialiasingCheckBox);
        checkBoxLayout->addWidget(transformationsCheckBox);

        QGridLayout *mainLayout = new QGridLayout;
        mainLayout->addWidget(renderArea, 0, 0, 1, 2);
        mainLayout->addWidget(shapeLabel, 1, 0);
        mainLayout->addWidget(shapeComboBox, 1, 1);
        mainLayout->addWidget(penWidthLabel, 2, 0);
        mainLayout->addWidget(penWidthSpinBox, 2, 1);
        mainLayout->addWidget(penStyleLabel, 3, 0);
        mainLayout->addWidget(penStyleComboBox, 3, 1);
        mainLayout->addWidget(penCapLabel, 4, 0);
        mainLayout->addWidget(penCapComboBox, 4, 1);
        mainLayout->addWidget(penJoinLabel, 5, 0);
        mainLayout->addWidget(penJoinComboBox, 5, 1);
        mainLayout->addWidget(brushStyleLabel, 6, 0);
        mainLayout->addWidget(brushStyleComboBox, 6, 1);
        mainLayout->addLayout(checkBoxLayout, 7, 0, 1, 2);
        setLayout(mainLayout);

        shapeChanged();
        penChanged();
        brushChanged();
        renderArea->setAntialiased(false);
        renderArea->setTransformed(false);

        setWindowTitle(tr("Basic Drawing"));
    }

    void Window::shapeChanged()
    {
        RenderArea::Shape shape =
            (RenderArea::Shape)shapeComboBox->itemData(shapeComboBox->currentIndex(), IdRole).toInt();
        renderArea->setShape(shape);
    }

    void Window::penChanged()
    {
        int width = penWidthSpinBox->value();
        Qt::PenStyle style =
            (Qt::PenStyle)penStyleComboBox->itemData(penStyleComboBox->currentIndex(), IdRole).toInt();
        Qt::PenCapStyle cap =
            (Qt::PenCapStyle)penCapComboBox->itemData(penCapComboBox->currentIndex(), IdRole).toInt();
        Qt::PenJoinStyle join =
            (Qt::PenJoinStyle)penJoinComboBox->itemData(penJoinComboBox->currentIndex(), IdRole).toInt();

        renderArea->setPen(QPen(Qt::blue, width, style, cap, join));
    }

    void Window::brushChanged()
    {
        Qt::BrushStyle style =
            (Qt::BrushStyle)brushStyleComboBox->itemData(brushStyleComboBox->currentIndex(), IdRole).toInt();

        if (style == Qt::LinearGradientPattern) {
            QLinearGradient linearGradient(0, 0, 100, 100);
            linearGradient.setColorAt(0.0, Qt::white);
            linearGradient.setColorAt(0.2, Qt::green);
            linearGradient.setColorAt(1.0, Qt::black);
            renderArea->setBrush(linearGradient);
        } else if (style == Qt::RadialGradientPattern) {
            QRadialGradient radialGradient(50, 50, 50, 50, 50);
            radialGradient.setColorAt(0.0, Qt::white);
            radialGradient.setColorAt(0.2, Qt::green);
            radialGradient.setColorAt(1.0, Qt::black);
            renderArea->setBrush(radialGradient);
        } else if (style == Qt::ConicalGradientPattern) {
            QConicalGradient conicalGradient(50, 50, 150);
            conicalGradient.setColorAt(0.0, Qt::white);
            conicalGradient.setColorAt(0.2, Qt::green);
            conicalGradient.setColorAt(1.0, Qt::black);
            renderArea->setBrush(conicalGradient);
        } else if (style == Qt::TexturePattern) {
            renderArea->setBrush(QBrush(QPixmap(":/images/brick.png")));
        } else {
            renderArea->setBrush(QBrush(Qt::green, style));
        }
    }


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