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playground/graphicscale/Canvas.cpp

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+/*****************************************************************************
+ * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#include "Canvas.h"
+#include <QwtGraphic>
+#include <QSvgRenderer>
+
+Canvas::Canvas( Mode mode, QWidget* parent )
+    : QWidget( parent )
+    , m_mode( mode )
+{
+    const int m = 10;
+    setContentsMargins( m, m, m, m );
+
+    if ( m_mode == Svg )
+        m_renderer = new QSvgRenderer( this );
+    else
+        m_graphic = new QwtGraphic();
+}
+
+Canvas::~Canvas()
+{
+    if ( m_mode == VectorGraphic )
+        delete m_graphic;
+}
+
+void Canvas::setSvg( const QByteArray& svgData )
+{
+    if ( m_mode == VectorGraphic )
+    {
+        m_graphic->reset();
+
+        QSvgRenderer renderer;
+        renderer.load( svgData );
+
+        QPainter p( m_graphic );
+        renderer.render( &p, renderer.viewBoxF() );
+        p.end();
+    }
+    else
+    {
+        m_renderer->load( svgData );
+    }
+
+    update();
+}
+
+void Canvas::paintEvent( QPaintEvent* )
+{
+    QPainter painter( this );
+
+    painter.save();
+
+    painter.setPen( Qt::black );
+    painter.setBrush( Qt::white );
+    painter.drawRect( contentsRect().adjusted( 0, 0, -1, -1 ) );
+
+    painter.restore();
+
+    painter.setPen( Qt::NoPen );
+    painter.setBrush( Qt::NoBrush );
+    render( &painter, contentsRect() );
+}
+
+void Canvas::render( QPainter* painter, const QRect& rect ) const
+{
+    if ( m_mode == Svg )
+    {
+        m_renderer->render( painter, rect );
+    }
+    else
+    {
+        m_graphic->render( painter, rect );
+    }
+}

playground/graphicscale/Canvas.h

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+/*****************************************************************************
+ * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#pragma once
+
+#include <QwtGlobal>
+#include <QWidget>
+
+class QSvgRenderer;
+class QwtGraphic;
+
+class Canvas : public QWidget
+{
+  public:
+    enum Mode
+    {
+        Svg,
+        VectorGraphic
+    };
+
+    Canvas( Mode, QWidget* parent = NULL );
+    virtual ~Canvas();
+
+    void setSvg( const QByteArray& );
+
+  protected:
+    virtual void paintEvent( QPaintEvent* ) QWT_OVERRIDE;
+
+  private:
+    void render( QPainter*, const QRect& ) const;
+
+    const Mode m_mode;
+    union
+    {
+        QSvgRenderer* m_renderer;
+        QwtGraphic* m_graphic;
+    };
+};

playground/graphicscale/MainWindow.cpp

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+/*****************************************************************************
+ * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#include "MainWindow.h"
+#include "Canvas.h"
+
+#include <QToolBar>
+#include <QToolButton>
+#include <QLayout>
+#include <QLabel>
+#include <QFileDialog>
+#include <QBuffer>
+#include <QPainter>
+#include <QSvgGenerator>
+#include <QStatusBar>
+
+MainWindow::MainWindow()
+{
+    QWidget* w = new QWidget( this );
+
+    m_canvas[0] = new Canvas( Canvas::Svg, this );
+    m_canvas[0]->setAutoFillBackground( true );
+    m_canvas[0]->setPalette( Qt::gray );
+
+    m_canvas[1] = new Canvas( Canvas::VectorGraphic, this );
+    m_canvas[1]->setAutoFillBackground( true );
+    m_canvas[1]->setPalette( Qt::gray );
+
+    QVBoxLayout* vBox1 = new QVBoxLayout();
+    vBox1->setContentsMargins( 0, 0, 0, 0 );
+    vBox1->setSpacing( 5 );
+    vBox1->addWidget( new QLabel( "SVG" ), 0, Qt::AlignCenter );
+    vBox1->addWidget( m_canvas[0], 10 );
+
+    QVBoxLayout* vBox2 = new QVBoxLayout();
+    vBox2->setContentsMargins( 0, 0, 0, 0 );
+    vBox2->setSpacing( 5 );
+    vBox2->addWidget( new QLabel( "Vector Graphic" ), 0, Qt::AlignCenter );
+    vBox2->addWidget( m_canvas[1], 10 );
+
+    QHBoxLayout* layout = new QHBoxLayout( w );
+    layout->addLayout( vBox1 );
+    layout->addLayout( vBox2 );
+
+    setCentralWidget( w );
+
+    QToolBar* toolBar = new QToolBar( this );
+
+    QToolButton* btnLoad = new QToolButton( toolBar );
+
+    btnLoad->setText( "Load SVG" );
+    btnLoad->setToolButtonStyle( Qt::ToolButtonTextUnderIcon );
+    toolBar->addWidget( btnLoad );
+
+    addToolBar( toolBar );
+
+    connect( btnLoad, SIGNAL(clicked()), this, SLOT(loadSVG()) );
+
+#if 0
+    QPainterPath path;
+    path.addRect( QRectF( 1.0, 1.0, 2.0, 2.0 ) );
+    loadPath( path );
+#endif
+}
+
+MainWindow::~MainWindow()
+{
+}
+
+void MainWindow::loadSVG()
+{
+    QString dir = "/home1/uwe/qwt/qwt/tests/svg";
+    const QString fileName = QFileDialog::getOpenFileName( NULL,
+        "Load a Scaleable Vector Graphic (SVG) Document",
+        dir, "SVG Files (*.svg)" );
+
+    if ( !fileName.isEmpty() )
+        loadSVG( fileName );
+
+    statusBar()->showMessage( fileName );
+}
+
+void MainWindow::loadSVG( const QString& fileName )
+{
+    QFile file( fileName );
+    if ( !file.open(QIODevice::ReadOnly | QIODevice::Text) )
+        return;
+
+    const QByteArray document = file.readAll();
+    file.close();
+
+    m_canvas[0]->setSvg( document );
+    m_canvas[1]->setSvg( document );
+}
+
+
+void MainWindow::loadPath( const QPainterPath& path )
+{
+    QBuffer buf;
+
+    QSvgGenerator generator;
+    generator.setOutputDevice( &buf );
+
+    QPainter painter( &generator );
+    painter.setRenderHint( QPainter::Antialiasing, false );
+    painter.setPen( QPen( Qt::blue, 0 ) );
+    painter.setBrush( Qt::darkCyan );
+    painter.drawPath( path );
+    painter.end();
+
+    m_canvas[0]->setSvg( buf.data() );
+    m_canvas[1]->setSvg( buf.data() );
+}
+
+#include "moc_MainWindow.cpp"

playground/graphicscale/MainWindow.h

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+/*****************************************************************************
+ * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#pragma once
+
+#include <QMainWindow>
+
+class Canvas;
+class QPainterPath;
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+  public:
+    MainWindow();
+    virtual ~MainWindow();
+
+  private Q_SLOTS:
+    void loadSVG();
+
+  private:
+    void loadSVG( const QString& );
+    void loadPath( const QPainterPath& );
+
+    Canvas* m_canvas[2];
+};

playground/graphicscale/graphicscale.pro

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+######################################################################
+# Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+# This file may be used under the terms of the 3-clause BSD License
+######################################################################
+
+include( $${PWD}/../playground.pri )
+
+greaterThan(QT_MAJOR_VERSION, 4) { 
+    !qtHaveModule(svg) {
+        error("Qt has been built without SVG support !")
+    }   
+}
+
+TARGET   = graphicscale
+QT      += svg
+
+HEADERS = \
+    Canvas.h \
+    MainWindow.h
+
+SOURCES = \
+    Canvas.cpp \
+    MainWindow.cpp \
+    main.cpp
+

playground/graphicscale/main.cpp

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+/*****************************************************************************
+ * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#include "MainWindow.h"
+#include <QApplication>
+
+int main( int argc, char* argv[] )
+{
+    QApplication app( argc, argv );
+
+    MainWindow window;
+    window.resize( 600, 400 );
+    window.show();
+
+    return app.exec();
+}