|  | Home · All Namespaces · All Classes · Main Classes · Grouped Classes · Modules · Functions |

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

     /****************************************************************************
     **
     ** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
     ** Contact: Qt Software Information (qt-info@nokia.com)
     **
     ** This file is part of the example classes of the Qt Toolkit.
     **
     ** Commercial Usage
     ** Licensees holding valid Qt Commercial licenses may use this file in
     ** accordance with the Qt Commercial License Agreement provided with the
     ** Software or, alternatively, in accordance with the terms contained in
     ** a written agreement between you and Nokia.
     **
     **
     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License versions 2.0 or 3.0 as published by the Free
     ** Software Foundation and appearing in the file LICENSE.GPL included in
     ** the packaging of this file.  Please review the following information
     ** to ensure GNU General Public Licensing requirements will be met:
     ** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
     ** http://www.gnu.org/copyleft/gpl.html.  In addition, as a special
     ** exception, Nokia gives you certain additional rights. These rights
     ** are described in the Nokia Qt GPL Exception version 1.3, included in
     ** the file GPL_EXCEPTION.txt in this package.
     **
     ** Qt for Windows(R) Licensees
     ** As a special exception, Nokia, as the sole copyright holder for Qt
     ** Designer, grants users of the Qt/Eclipse Integration plug-in the
     ** right for the Qt/Eclipse Integration to link to functionality
     ** provided by Qt Designer and its related libraries.
     **
     ** If you are unsure which license is appropriate for your use, please
     ** contact the sales department at qt-sales@nokia.com.
     **
     ****************************************************************************/

     #include <QtGui>

     #include "renderarea.h"

     RenderArea::RenderArea(QWidget *parent)
         : QWidget(parent)
     {
         QFont newFont = font();
         newFont.setPixelSize(12);
         setFont(newFont);

         QFontMetrics fontMetrics(newFont);
         xBoundingRect = fontMetrics.boundingRect(tr("x"));
         yBoundingRect = fontMetrics.boundingRect(tr("y"));
     }

     void RenderArea::setOperations(const QList<Operation> &operations)
     {
         this->operations = operations;
         update();
     }

     void RenderArea::setShape(const QPainterPath &shape)
     {
         this->shape = shape;
         update();
     }

     QSize RenderArea::minimumSizeHint() const
     {
         return QSize(182, 182);
     }

     QSize RenderArea::sizeHint() const
     {
         return QSize(232, 232);
     }

     void RenderArea::paintEvent(QPaintEvent *event)
     {
         QPainter painter(this);
         painter.setRenderHint(QPainter::Antialiasing);
         painter.fillRect(event->rect(), QBrush(Qt::white));

         painter.translate(66, 66);

         painter.save();
         transformPainter(painter);
         drawShape(painter);
         painter.restore();

         drawOutline(painter);

         transformPainter(painter);
         drawCoordinates(painter);
     }

     void RenderArea::drawCoordinates(QPainter &painter)
     {
         painter.setPen(Qt::red);

         painter.drawLine(0, 0, 50, 0);
         painter.drawLine(48, -2, 50, 0);
         painter.drawLine(48, 2, 50, 0);
         painter.drawText(60 - xBoundingRect.width() / 2,
                          0 + xBoundingRect.height() / 2, tr("x"));

         painter.drawLine(0, 0, 0, 50);
         painter.drawLine(-2, 48, 0, 50);
         painter.drawLine(2, 48, 0, 50);
         painter.drawText(0 - yBoundingRect.width() / 2,
                          60 + yBoundingRect.height() / 2, tr("y"));
     }

     void RenderArea::drawOutline(QPainter &painter)
     {
         painter.setPen(Qt::darkGreen);
         painter.setPen(Qt::DashLine);
         painter.setBrush(Qt::NoBrush);
         painter.drawRect(0, 0, 100, 100);
     }

     void RenderArea::drawShape(QPainter &painter)
     {
         painter.fillPath(shape, Qt::blue);
     }

     void RenderArea::transformPainter(QPainter &painter)
     {
         for (int i = 0; i < operations.size(); ++i) {
             switch (operations[i]) {
             case Translate:
                 painter.translate(50, 50);
                 break;
             case Scale:
                 painter.scale(0.75, 0.75);
                 break;
             case Rotate:
                 painter.rotate(60);
                 break;
             case NoTransformation:
             default:
                 ;
             }
         }
     }