svg viewer
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#ifndef SVGVIEW_H
#define SVGVIEW_H
#include <QGraphicsView>
QT_BEGIN_NAMESPACE
class QWheelEvent;
class QPaintEvent;
class QFile;
QT_END_NAMESPACE
class SvgView : public QGraphicsView
{
Q_OBJECT
public:
enum RendererType { Native, OpenGL, Image };
SvgView(QWidget *parent = 0);
void openFile(const QFile &file);
void setRenderer(RendererType type = Native);
void drawBackground(QPainter *p, const QRectF &rect);
public slots:
void setHighQualityAntialiasing(bool highQualityAntialiasing);
void setViewBackground(bool enable);
void setViewOutline(bool enable);
protected:
void wheelEvent(QWheelEvent *event);
void paintEvent(QPaintEvent *event);
private:
RendererType m_renderer;
QGraphicsItem *m_svgItem;
QGraphicsRectItem *m_backgroundItem;
QGraphicsRectItem *m_outlineItem;
QImage m_image;
};
#end
#include "svgview.h"
#include <QFile>
#include <QWheelEvent>
#include <QMouseEvent>
#include <QGraphicsRectItem>
#include <QGraphicsSvgItem>
#include <QPaintEvent>
#include <qmath.h>
#ifndef QT_NO_OPENGL
#include <QGLWidget>
#endif
SvgView::SvgView(QWidget *parent)
: QGraphicsView(parent)
, m_renderer(Native)
, m_svgItem(0)
, m_backgroundItem(0)
, m_outlineItem(0)
{
setScene(new QGraphicsScene(this));
setTransformationAnchor(AnchorUnderMouse);
setDragMode(ScrollHandDrag);
// Prepare background check-board pattern
QPixmap tilePixmap(64, 64);
tilePixmap.fill(Qt::white);
QPainter tilePainter(&tilePixmap);
QColor color(220, 220, 220);
tilePainter.fillRect(0, 0, 32, 32, color);
tilePainter.fillRect(32, 32, 32, 32, color);
tilePainter.end();
setBackgroundBrush(tilePixmap);
}
void SvgView::drawBackground(QPainter *p, const QRectF &)
{
p->save();
p->resetTransform();
p->drawTiledPixmap(viewport()->rect(), backgroundBrush().texture());
p->restore();
}
void SvgView::openFile(const QFile &file)
{
if (!file.exists())
return;
QGraphicsScene *s = scene();
bool drawBackground = (m_backgroundItem ? m_backgroundItem->isVisible() : false);
bool drawOutline = (m_outlineItem ? m_outlineItem->isVisible() : true);
s->clear();
resetTransform();
m_svgItem = new QGraphicsSvgItem(file.fileName());
m_svgItem->setFlags(QGraphicsItem::ItemClipsToShape);
m_svgItem->setCacheMode(QGraphicsItem::NoCache);
m_svgItem->setZValue(0);
m_backgroundItem = new QGraphicsRectItem(m_svgItem->boundingRect());
m_backgroundItem->setBrush(Qt::white);
m_backgroundItem->setPen(Qt::NoPen);
m_backgroundItem->setVisible(drawBackground);
m_backgroundItem->setZValue(-1);
m_outlineItem = new QGraphicsRectItem(m_svgItem->boundingRect());
QPen outline(Qt::black, 2, Qt::DashLine);
outline.setCosmetic(true);
m_outlineItem->setPen(outline);
m_outlineItem->setBrush(Qt::NoBrush);
m_outlineItem->setVisible(drawOutline);
m_outlineItem->setZValue(1);
s->addItem(m_backgroundItem);
s->addItem(m_svgItem);
s->addItem(m_outlineItem);
s->setSceneRect(m_outlineItem->boundingRect().adjusted(-10, -10, 10, 10));
}
void SvgView::setRenderer(RendererType type)
{
m_renderer = type;
if (m_renderer == OpenGL) {
#ifndef QT_NO_OPENGL
setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));
#endif
} else {
setViewport(new QWidget);
}
}
void SvgView::setHighQualityAntialiasing(bool highQualityAntialiasing)
{
#ifndef QT_NO_OPENGL
setRenderHint(QPainter::HighQualityAntialiasing, highQualityAntialiasing);
#else
Q_UNUSED(highQualityAntialiasing);
#endif
}
void SvgView::setViewBackground(bool enable)
{
if (!m_backgroundItem)
return;
m_backgroundItem->setVisible(enable);
}
void SvgView::setViewOutline(bool enable)
{
if (!m_outlineItem)
return;
m_outlineItem->setVisible(enable);
}
void SvgView::paintEvent(QPaintEvent *event)
{
if (m_renderer == Image) {
if (m_image.size() != viewport()->size()) {
m_image = QImage(viewport()->size(), QImage::Format_ARGB32_Premultiplied);
}
QPainter imagePainter(&m_image);
QGraphicsView::render(&imagePainter);
imagePainter.end();
QPainter p(viewport());
p.drawImage(0, 0, m_image);
} else {
QGraphicsView::paintEvent(event);
}
}
void SvgView::wheelEvent(QWheelEvent *event)
{
qreal factor = qPow(1.2, event->delta() / 240.0);
scale(factor, factor);
event->accept();
}
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QString>
class SvgView;
QT_BEGIN_NAMESPACE
class QAction;
class QGraphicsView;
class QGraphicsScene;
class QGraphicsRectItem;
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow();
public slots:
void openFile(const QString &path = QString());
void setRenderer(QAction *action);
private:
QAction *m_nativeAction;
QAction *m_glAction;
QAction *m_imageAction;
QAction *m_highQualityAntialiasingAction;
QAction *m_backgroundAction;
QAction *m_outlineAction;
SvgView *m_view;
QString m_currentPath;
};
#endif
#include "mainwindow.h"
#include <QtGui>
#include "svgview.h"
MainWindow::MainWindow()
: QMainWindow()
, m_view(new SvgView)
{
QMenu *fileMenu = new QMenu(tr("&File"), this);
QAction *openAction = fileMenu->addAction(tr("&Open..."));
openAction->setShortcut(QKeySequence(tr("Ctrl+O")));
QAction *quitAction = fileMenu->addAction(tr("E&xit"));
quitAction->setShortcut(QKeySequence(tr("Ctrl+Q")));
menuBar()->addMenu(fileMenu);
QMenu *viewMenu = new QMenu(tr("&View"), this);
m_backgroundAction = viewMenu->addAction(tr("&Background"));
m_backgroundAction->setEnabled(false);
m_backgroundAction->setCheckable(true);
m_backgroundAction->setChecked(false);
connect(m_backgroundAction, SIGNAL(toggled(bool)), m_view, SLOT(setViewBackground(bool)));
m_outlineAction = viewMenu->addAction(tr("&Outline"));
m_outlineAction->setEnabled(false);
m_outlineAction->setCheckable(true);
m_outlineAction->setChecked(true);
connect(m_outlineAction, SIGNAL(toggled(bool)), m_view, SLOT(setViewOutline(bool)));
menuBar()->addMenu(viewMenu);
QMenu *rendererMenu = new QMenu(tr("&Renderer"), this);
m_nativeAction = rendererMenu->addAction(tr("&Native"));
m_nativeAction->setCheckable(true);
m_nativeAction->setChecked(true);
#ifndef QT_NO_OPENGL
m_glAction = rendererMenu->addAction(tr("&OpenGL"));
m_glAction->setCheckable(true);
#endif
m_imageAction = rendererMenu->addAction(tr("&Image"));
m_imageAction->setCheckable(true);
#ifndef QT_NO_OPENGL
rendererMenu->addSeparator();
m_highQualityAntialiasingAction = rendererMenu->addAction(tr("&High Quality Antialiasing"));
m_highQualityAntialiasingAction->setEnabled(false);
m_highQualityAntialiasingAction->setCheckable(true);
m_highQualityAntialiasingAction->setChecked(false);
connect(m_highQualityAntialiasingAction, SIGNAL(toggled(bool)), m_view, SLOT(setHighQualityAntialiasing(bool)));
#endif
QActionGroup *rendererGroup = new QActionGroup(this);
rendererGroup->addAction(m_nativeAction);
#ifndef QT_NO_OPENGL
rendererGroup->addAction(m_glAction);
#endif
rendererGroup->addAction(m_imageAction);
menuBar()->addMenu(rendererMenu);
connect(openAction, SIGNAL(triggered()), this, SLOT(openFile()));
connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
connect(rendererGroup, SIGNAL(triggered(QAction *)),
this, SLOT(setRenderer(QAction *)));
setCentralWidget(m_view);
setWindowTitle(tr("SVG Viewer"));
}
void MainWindow::openFile(const QString &path)
{
QString fileName;
if (path.isNull())
fileName = QFileDialog::getOpenFileName(this, tr("Open SVG File"),
m_currentPath, "SVG files (*.svg *.svgz *.svg.gz)");
else
fileName = path;
if (!fileName.isEmpty()) {
QFile file(fileName);
if (!file.exists()) {
QMessageBox::critical(this, tr("Open SVG File"),
QString("Could not open file '%1'.").arg(fileName));
m_outlineAction->setEnabled(false);
m_backgroundAction->setEnabled(false);
return;
}
m_view->openFile(file);
if (!fileName.startsWith(":/")) {
m_currentPath = fileName;
setWindowTitle(tr("%1 - SVGViewer").arg(m_currentPath));
}
m_outlineAction->setEnabled(true);
m_backgroundAction->setEnabled(true);
resize(m_view->sizeHint() + QSize(80, 80 + menuBar()->height()));
}
}
void MainWindow::setRenderer(QAction *action)
{
#ifndef QT_NO_OPENGL
m_highQualityAntialiasingAction->setEnabled(false);
#endif
if (action == m_nativeAction)
m_view->setRenderer(SvgView::Native);
#ifndef QT_NO_OPENGL
else if (action == m_glAction) {
m_highQualityAntialiasingAction->setEnabled(true);
m_view->setRenderer(SvgView::OpenGL);
}
#endif
else if (action == m_imageAction) {
m_view->setRenderer(SvgView::Image);
}
}
#include <QApplication>
#include <QString>
#ifndef QT_NO_OPENGL
#include <QGLFormat>
#endif
#include "mainwindow.h"
int main(int argc, char **argv)
{
Q_INIT_RESOURCE(svgviewer);
QApplication app(argc, argv);
MainWindow window;
if (argc == 2)
window.openFile(argv[1]);
else
window.openFile(":/files/bubbles.svg");
window.show();
return app.exec();
}
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