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

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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;
     update();
 }

 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