Qt Reference Documentation

- Qt 4.8
- ALL VERSIONS

- A
- A
- A
- Print

# renderarea.cpp Example File

painting/painterpaths/renderarea.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of The Qt Company Ltd nor the names of its
     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #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);
     }