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

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     **
     ** 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 versions 2.0 or 3.0 as published by the Free Software
    ** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
    ** included in the packaging of this file.  Alternatively you may (at
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    ** (or its successors, if any) and the KDE Free Qt Foundation.
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    ** granted herein.
     **
     ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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     #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);
             buffer.fill(0x0);
             QPainter p(&buffer);
             p.setViewport(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),
           highQualityAntialiasing(false)
     {
         doc = new QSvgRenderer(file, this);
         connect(doc, SIGNAL(repaintNeeded()),
                 this, SLOT(update()));
     }

     void SvgGLView::setHighQualityAntialiasing(bool hq)
     {
         highQualityAntialiasing = hq;
     }

     void SvgGLView::paintEvent(QPaintEvent *)
     {
         QPainter p(this);
         p.setRenderHint(QPainter::HighQualityAntialiasing, highQualityAntialiasing);
         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