Qt 4.0: renderarea.cpp Example File (painting/painterpaths/renderarea.cpp)

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

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        ** Copyright (C) 2005-2005 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
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    ** and appearing in the file LICENSE.GPL included in the packaging of
    ** this file.  Please review the following information to ensure GNU
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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);
        }