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# svgview.cpp Example File
painting/svgviewer/svgview.cpp

        /****************************************************************************
        **
        ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
        ** License version 2.0 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.trolltech.com/products/qt/opensource.html
        **
        ** If you are unsure which license is appropriate for your use, please
        ** review the following information:
        ** http://www.trolltech.com/products/qt/licensing.html or contact the
        ** sales department at sales@trolltech.com.
        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        **
        ****************************************************************************/
        #include "svgview.h"

        #include <QSvgRenderer>

        #include <QApplication>
        #include <QPainter>
        #include <QImage>
        #include <QWheelEvent>
        #include <QtDebug>

        SvgRasterView::SvgRasterView(const QString &file, QWidget *parent)
            : QWidget(parent)
        {
            doc = new QSvgRenderer(file, this);
            connect(doc, SIGNAL(repaintNeeded()),
                    this, SLOT(poluteImage()));
        }

        void SvgRasterView::paintEvent(QPaintEvent *)
        {
            if (buffer.size() != size() ||
                m_dirty) {
                buffer = QImage(size(), QImage::Format_ARGB32_Premultiplied);
                QPainter p(&buffer);
                p.setViewport(0, 0, width(), height());
                p.eraseRect(0, 0, width(), height());
                doc->render(&p);
            }
            QPainter pt(this);
            pt.drawImage(0, 0, buffer);
        }

        QSize SvgRasterView::sizeHint() const
        {
            if (doc)
                return doc->defaultSize();
            return QWidget::sizeHint();
        }

        void SvgRasterView::poluteImage()
        {
            m_dirty = true;
            update();
        }

        void SvgRasterView::wheelEvent(QWheelEvent *e)
        {
            const double diff = 0.1;
            QSize size = doc->defaultSize();
            int width  = size.width();
            int height = size.height();
            if (e->delta() > 0) {
                width = int(this->width()+this->width()*diff);
                height = int(this->height()+this->height()*diff);
            } else {
                width  = int(this->width()-this->width()*diff);
                height = int(this->height()-this->height()*diff);
            }

            resize(width, height);
        }

        SvgNativeView::SvgNativeView(const QString &file, QWidget *parent)
            : QWidget(parent)
        {
            doc = new QSvgRenderer(file, this);
            connect(doc, SIGNAL(repaintNeeded()),
                    this, SLOT(update()));
        }

        void SvgNativeView::paintEvent(QPaintEvent *)
        {
            QPainter p(this);
            p.setViewport(0, 0, width(), height());
            doc->render(&p);
        }

        QSize SvgNativeView::sizeHint() const
        {
            if (doc)
                return doc->defaultSize();
            return QWidget::sizeHint();
        }

        void SvgNativeView::wheelEvent(QWheelEvent *e)
        {
            const double diff = 0.1;
            QSize size = doc->defaultSize();
            int width  = size.width();
            int height = size.height();
            if (e->delta() > 0) {
                width = int(this->width()+this->width()*diff);
                height = int(this->height()+this->height()*diff);
            } else {
                width  = int(this->width()-this->width()*diff);
                height = int(this->height()-this->height()*diff);
            }
            resize(width, height);
        }

        #ifndef QT_NO_OPENGL
        SvgGLView::SvgGLView(const QString &file, QWidget *parent)
            : QGLWidget(QGLFormat(QGL::SampleBuffers), parent)
        {
            doc = new QSvgRenderer(file, this);
            connect(doc, SIGNAL(repaintNeeded()),
                    this, SLOT(update()));
        }

        void SvgGLView::paintEvent(QPaintEvent *)
        {
            QPainter p(this);
            doc->render(&p);
        }

        QSize SvgGLView::sizeHint() const
        {
            if (doc)
                return doc->defaultSize();
            return QGLWidget::sizeHint();
        }

        void SvgGLView::wheelEvent(QWheelEvent *e)
        {
            const double diff = 0.1;
            QSize size = doc->defaultSize();
            int width  = size.width();
            int height = size.height();
            if (e->delta() > 0) {
                width = int(this->width()+this->width()*diff);
                height = int(this->height()+this->height()*diff);
            } else {
                width  = int(this->width()-this->width()*diff);
                height = int(this->height()-this->height()*diff);
            }
            resize(width, height);
        }
        #endif