Qt 4.3: renderarea.cpp Example File (painting/painterpaths/renderarea.cpp)

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

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     #include <QtGui>

     #include "renderarea.h"

     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);

         painter.setPen(QPen(penColor, penWidth, Qt::SolidLine, Qt::RoundCap,
                             Qt::RoundJoin));
         QLinearGradient gradient(0, 0, 0, 100);
         gradient.setColorAt(0.0, fillColor1);
         gradient.setColorAt(1.0, fillColor2);
         painter.setBrush(gradient);
         painter.drawPath(path);
     }