class Window : public QWidget
{
Q_OBJECT
public:
Window();
private slots:
void fillRuleChanged();
void fillGradientChanged();
void penColorChanged();
private:
void populateWithColors(QComboBox *comboBox);
QVariant currentItemData(QComboBox *comboBox);
enum { NumRenderAreas = 9 };
RenderArea *renderAreas[NumRenderAreas];
QLabel *fillRuleLabel;
QLabel *fillGradientLabel;
QLabel *fillToLabel;
QLabel *penWidthLabel;
QLabel *penColorLabel;
QLabel *rotationAngleLabel;
QComboBox *fillRuleComboBox;
QComboBox *fillColor1ComboBox;
QComboBox *fillColor2ComboBox;
QSpinBox *penWidthSpinBox;
QComboBox *penColorComboBox;
QSpinBox *rotationAngleSpinBox;
};
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"));
class RenderArea : public QWidget
{
Q_OBJECT
public:
RenderArea(const QPainterPath &path, QWidget *parent = 0);
QSize minimumSizeHint() const;
QSize sizeHint() const;
public slots:
void setFillRule(Qt::FillRule rule);
void setFillGradient(const QColor &color1, const QColor &color2);
void setPenWidth(int width);
void setPenColor(const QColor &color);
void setRotationAngle(int degrees);
protected:
void paintEvent(QPaintEvent *event);
private:
QPainterPath path;
QColor fillColor1;
QColor fillColor2;
int penWidth;
QColor penColor;
int rotationAngle;
};
RenderArea::RenderArea(const QPainterPath &path, QWidget *parent)
: QWidget(parent), path(path)
{
penWidth = 1;
rotationAngle = 0;
setBackgroundRole(QPalette::Base);
}
QSize RenderArea::minimumSizeHint() const
{
return QSize(50, 50);
}
QSize RenderArea::sizeHint() const
{
return QSize(100, 100);
}
void RenderArea::setFillRule(Qt::FillRule rule)
{
path.setFillRule(rule);
update();
}
void RenderArea::setFillGradient(const QColor &color1, const QColor &color2)
{
fillColor1 = color1;
fillColor2 = color2;
update();
}
void RenderArea::setPenWidth(int width)
{
penWidth = width;
update();
}
void RenderArea::setPenColor(const QColor &color)
{
penColor = color;
update();
}
void RenderArea::setRotationAngle(int degrees)
{
rotationAngle = degrees;
update();
}
void RenderArea::paintEvent(QPaintEvent *)
{
QPainter painter(this);
painter.setRenderHint(QPainter::Antialiasing)
painter.scale(width() / 100.0, height() / 100.0);
painter.translate(50.0, 50.0);
painter.rotate(-rotationAngle);
painter.translate(-50.0, -50.0);
