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:
             ;
         }
     }
 }