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# window.cpp Example File
painting/painterpaths/window.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
    **
    ** This file is part of the example classes of the Qt Toolkit.
    **
    ** Licensees holding valid Qt Preview licenses may use this file in
    ** accordance with the Qt Preview License Agreement provided with the
    ** Software.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    ** information about Qt Commercial License Agreements.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    ** 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 <math.h>

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

    const float Pi = 3.14159f;

    Window::Window()
    {
        QPainterPath rectPath;
        rectPath.moveTo(20.0, 30.0);
        rectPath.lineTo(80.0, 30.0);
        rectPath.lineTo(80.0, 70.0);
        rectPath.lineTo(20.0, 70.0);
        rectPath.closeSubpath();

        QPainterPath roundRectPath;
        roundRectPath.moveTo(80.0, 35.0);
        roundRectPath.arcTo(70.0, 30.0, 10.0, 10.0, 0.0, 90.0);
        roundRectPath.lineTo(25.0, 30.0);
        roundRectPath.arcTo(20.0, 30.0, 10.0, 10.0, 90.0, 90.0);
        roundRectPath.lineTo(20.0, 65.0);
        roundRectPath.arcTo(20.0, 60.0, 10.0, 10.0, 180.0, 90.0);
        roundRectPath.lineTo(75.0, 70.0);
        roundRectPath.arcTo(70.0, 60.0, 10.0, 10.0, 270.0, 90.0);
        roundRectPath.closeSubpath();

        QPainterPath ellipsePath;
        ellipsePath.moveTo(80.0, 50.0);
        ellipsePath.arcTo(20.0, 30.0, 60.0, 40.0, 0.0, 360.0);

        QPainterPath piePath;
        piePath.moveTo(50.0, 50.0);
        piePath.arcTo(20.0, 30.0, 60.0, 40.0, 60.0, 240.0);
        piePath.closeSubpath();

        QPainterPath polygonPath;
        polygonPath.moveTo(10.0, 80.0);
        polygonPath.lineTo(20.0, 10.0);
        polygonPath.lineTo(80.0, 30.0);
        polygonPath.lineTo(90.0, 70.0);
        polygonPath.closeSubpath();

        QPainterPath groupPath;
        groupPath.moveTo(60.0, 40.0);
        groupPath.arcTo(20.0, 20.0, 40.0, 40.0, 0.0, 360.0);
        groupPath.moveTo(40.0, 40.0);
        groupPath.lineTo(40.0, 80.0);
        groupPath.lineTo(80.0, 80.0);
        groupPath.lineTo(80.0, 40.0);
        groupPath.closeSubpath();

        QPainterPath textPath;
        QFont timesFont("Times", 50);
        timesFont.setStyleStrategy(QFont::ForceOutline);
        textPath.addText(10, 70, timesFont, tr("Qt"));

        QPainterPath bezierPath;
        bezierPath.moveTo(20, 30);
        bezierPath.cubicTo(80, 0, 50, 50, 80, 80);

        QPainterPath starPath;
        starPath.moveTo(90, 50);
        for (int i = 1; i < 5; ++i) {
            starPath.lineTo(50 + 40 * cos(0.8 * i * Pi),
                            50 + 40 * sin(0.8 * i * Pi));
        }
        starPath.closeSubpath();

        renderAreas[0] = new RenderArea(rectPath);
        renderAreas[1] = new RenderArea(roundRectPath);
        renderAreas[2] = new RenderArea(ellipsePath);
        renderAreas[3] = new RenderArea(piePath);
        renderAreas[4] = new RenderArea(polygonPath);
        renderAreas[5] = new RenderArea(groupPath);
        renderAreas[6] = new RenderArea(textPath);
        renderAreas[7] = new RenderArea(bezierPath);
        renderAreas[8] = new RenderArea(starPath);
        Q_ASSERT(NumRenderAreas == 9);

        fillRuleComboBox = new QComboBox;
        fillRuleComboBox->addItem(tr("Odd Even"), Qt::OddEvenFill);
        fillRuleComboBox->addItem(tr("Winding"), Qt::WindingFill);

        fillRuleLabel = new QLabel(tr("Fill &Rule:"));
        fillRuleLabel->setBuddy(fillRuleComboBox);

        fillColor1ComboBox = new QComboBox;
        populateWithColors(fillColor1ComboBox);
        fillColor1ComboBox->setCurrentIndex(
                fillColor1ComboBox->findText("mediumslateblue"));

        fillColor2ComboBox = new QComboBox;
        populateWithColors(fillColor2ComboBox);
        fillColor2ComboBox->setCurrentIndex(
                fillColor2ComboBox->findText("cornsilk"));

        fillGradientLabel = new QLabel(tr("&Fill Gradient:"));
        fillGradientLabel->setBuddy(fillColor1ComboBox);

        fillToLabel = new QLabel(tr("to"));
        fillToLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

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

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

        penColorComboBox = new QComboBox;
        populateWithColors(penColorComboBox);
        penColorComboBox->setCurrentIndex(
                penColorComboBox->findText("darkslateblue"));

        penColorLabel = new QLabel(tr("Pen &Color:"));
        penColorLabel->setBuddy(penColorComboBox);

        rotationAngleSpinBox = new QSpinBox;
        rotationAngleSpinBox->setRange(0, 359);
        rotationAngleSpinBox->setWrapping(true);
        rotationAngleSpinBox->setSuffix("\xB0");

        rotationAngleLabel = new QLabel(tr("&Rotation Angle:"));
        rotationAngleLabel->setBuddy(rotationAngleSpinBox);

        connect(fillRuleComboBox, SIGNAL(activated(int)),
                this, SLOT(fillRuleChanged()));
        connect(fillColor1ComboBox, SIGNAL(activated(int)),
                this, SLOT(fillGradientChanged()));
        connect(fillColor2ComboBox, SIGNAL(activated(int)),
                this, SLOT(fillGradientChanged()));
        connect(penColorComboBox, SIGNAL(activated(int)),
                this, SLOT(penColorChanged()));

        for (int i = 0; i < NumRenderAreas; ++i) {
            connect(penWidthSpinBox, SIGNAL(valueChanged(int)),
                    renderAreas[i], SLOT(setPenWidth(int)));
            connect(rotationAngleSpinBox, SIGNAL(valueChanged(int)),
                    renderAreas[i], SLOT(setRotationAngle(int)));
        }

        QGridLayout *topLayout = new QGridLayout;
        for (int i = 0; i < NumRenderAreas; ++i)
            topLayout->addWidget(renderAreas[i], i / 3, i % 3);

        QGridLayout *mainLayout = new QGridLayout;
        mainLayout->addLayout(topLayout, 0, 0, 1, 4);
        mainLayout->addWidget(fillRuleLabel, 1, 0);
        mainLayout->addWidget(fillRuleComboBox, 1, 1, 1, 3);
        mainLayout->addWidget(fillGradientLabel, 2, 0);
        mainLayout->addWidget(fillColor1ComboBox, 2, 1);
        mainLayout->addWidget(fillToLabel, 2, 2);
        mainLayout->addWidget(fillColor2ComboBox, 2, 3);
        mainLayout->addWidget(penWidthLabel, 3, 0);
        mainLayout->addWidget(penWidthSpinBox, 3, 1, 1, 3);
        mainLayout->addWidget(penColorLabel, 4, 0);
        mainLayout->addWidget(penColorComboBox, 4, 1, 1, 3);
        mainLayout->addWidget(rotationAngleLabel, 5, 0);
        mainLayout->addWidget(rotationAngleSpinBox, 5, 1, 1, 3);
        setLayout(mainLayout);

        fillRuleChanged();
        fillGradientChanged();
        penColorChanged();
        penWidthSpinBox->setValue(2);

        setWindowTitle(tr("Painter Paths"));
    }

    void Window::fillRuleChanged()
    {
        Qt::FillRule rule = (Qt::FillRule)currentItemData(fillRuleComboBox).toInt();

        for (int i = 0; i < NumRenderAreas; ++i)
            renderAreas[i]->setFillRule(rule);
    }

    void Window::fillGradientChanged()
    {
        QColor color1 = qvariant_cast<QColor>(currentItemData(fillColor1ComboBox));
        QColor color2 = qvariant_cast<QColor>(currentItemData(fillColor2ComboBox));

        for (int i = 0; i < NumRenderAreas; ++i)
            renderAreas[i]->setFillGradient(color1, color2);
    }

    void Window::penColorChanged()
    {
        QColor color = qvariant_cast<QColor>(currentItemData(penColorComboBox));

        for (int i = 0; i < NumRenderAreas; ++i)
            renderAreas[i]->setPenColor(color);
    }

    void Window::populateWithColors(QComboBox *comboBox)
    {
        QStringList colorNames = QColor::colorNames();
        foreach (QString name, colorNames)
            comboBox->addItem(name, QColor(name));
    }

    QVariant Window::currentItemData(QComboBox *comboBox)
    {
        return comboBox->itemData(comboBox->currentIndex());
    }