window.cpp 范例文件

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#include "renderarea.h"
#include "window.h"
#include <QtWidgets>
#include <cmath>
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 * std::cos(0.8 * i * Pi),
                        50 + 40 * std::sin(0.8 * i * Pi));
    }
    starPath.closeSubpath();
    renderAreas.push_back(new RenderArea(rectPath));
    renderAreas.push_back(new RenderArea(roundRectPath));
    renderAreas.push_back(new RenderArea(ellipsePath));
    renderAreas.push_back(new RenderArea(piePath));
    renderAreas.push_back(new RenderArea(polygonPath));
    renderAreas.push_back(new RenderArea(groupPath));
    renderAreas.push_back(new RenderArea(textPath));
    renderAreas.push_back(new RenderArea(bezierPath));
    renderAreas.push_back(new RenderArea(starPath));
    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(QLatin1String("\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(QList<RenderArea*>::iterator it = renderAreas.begin(); it != renderAreas.end(); it++) {
        connect(penWidthSpinBox, SIGNAL(valueChanged(int)), *it, SLOT(setPenWidth(int)));
        connect(rotationAngleSpinBox, SIGNAL(valueChanged(int)), *it, SLOT(setRotationAngle(int)));
    }
    QGridLayout *topLayout = new QGridLayout;
    int i=0;
    for(QList<RenderArea*>::iterator it = renderAreas.begin(); it != renderAreas.end(); it++, i++)
        topLayout->addWidget(*it, 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 (QList<RenderArea*>::iterator it = renderAreas.begin(); it != renderAreas.end(); ++it)
        (*it)->setFillRule(rule);
}
void Window::fillGradientChanged()
{
    QColor color1 = qvariant_cast<QColor>(currentItemData(fillColor1ComboBox));
    QColor color2 = qvariant_cast<QColor>(currentItemData(fillColor2ComboBox));
    for (QList<RenderArea*>::iterator it = renderAreas.begin(); it != renderAreas.end(); ++it)
        (*it)->setFillGradient(color1, color2);
}
void Window::penColorChanged()
{
    QColor color = qvariant_cast<QColor>(currentItemData(penColorComboBox));
    for (QList<RenderArea*>::iterator it = renderAreas.begin(); it != renderAreas.end(); ++it)
        (*it)->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());
}