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playground/svgmap/Plot.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 "Plot.h"
+
+#include <QwtPlotGraphicItem>
+#include <QwtPlotLayout>
+#include <QwtPlotPanner>
+#include <QwtPlotMagnifier>
+#include <QwtGraphic>
+
+#define DEBUG_SCALE 0
+
+#if DEBUG_SCALE
+#include <QwtPlotGrid>
+#endif
+
+#include <QSvgRenderer>
+#include <QFileDialog>
+
+Plot::Plot( QWidget* parent )
+    : QwtPlot( parent )
+    , m_mapItem( NULL )
+    , m_mapRect( 0.0, 0.0, 100.0, 100.0 ) // something
+{
+#if DEBUG_SCALE
+    QwtPlotGrid* grid = new QwtPlotGrid();
+    grid->attach( this );
+#else
+    /*
+       m_mapRect is only a reference for zooming, but
+       the ranges are nothing useful for the user. So we
+       hide the axes.
+     */
+    plotLayout()->setCanvasMargin( 0 );
+    for ( int axisPos = 0; axisPos < QwtAxis::AxisPositions; axisPos++ )
+        setAxisVisible( axisPos, false );
+#endif
+
+    /*
+       Navigation:
+
+       Left Mouse Button: Panning
+       Mouse Wheel:       Zooming In/Out
+       Right Mouse Button: Reset to initial
+     */
+
+    ( void )new QwtPlotPanner( canvas() );
+    ( void )new QwtPlotMagnifier( canvas() );
+
+    canvas()->setFocusPolicy( Qt::WheelFocus );
+    setCanvasBackground( Qt::white );
+
+    rescale();
+}
+
+#ifndef QT_NO_FILEDIALOG
+
+void Plot::loadSVG()
+{
+    QString dir;
+    const QString fileName = QFileDialog::getOpenFileName( NULL,
+        "Load a Scaleable Vector Graphic (SVG) Map",
+        dir, "SVG Files (*.svg)" );
+
+    if ( !fileName.isEmpty() )
+        loadSVG( fileName );
+}
+
+#endif
+
+void Plot::loadSVG( const QString& fileName )
+{
+    if ( m_mapItem == NULL )
+    {
+        m_mapItem = new QwtPlotGraphicItem();
+        m_mapItem->attach( this );
+    }
+
+    QwtGraphic graphic;
+
+    QSvgRenderer renderer;
+    if ( renderer.load( fileName ) )
+    {
+        QPainter p( &graphic );
+        renderer.render( &p );
+    }
+
+    m_mapItem->setGraphic( m_mapRect, graphic );
+
+    rescale();
+    replot();
+}
+
+void Plot::rescale()
+{
+    setAxisScale( QwtAxis::XBottom, m_mapRect.left(), m_mapRect.right() );
+    setAxisScale( QwtAxis::YLeft, m_mapRect.top(), m_mapRect.bottom() );
+}
+
+#include "moc_Plot.cpp"

playground/svgmap/Plot.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 <QwtPlot>
+#include <QRect>
+
+class QwtPlotGraphicItem;
+
+class Plot : public QwtPlot
+{
+    Q_OBJECT
+
+  public:
+    Plot( QWidget* = NULL );
+
+  public Q_SLOTS:
+
+#ifndef QT_NO_FILEDIALOG
+    void loadSVG();
+#endif
+
+    void loadSVG( const QString& );
+
+  private:
+    void rescale();
+
+    QwtPlotGraphicItem* m_mapItem;
+    const QRectF m_mapRect;
+};

playground/svgmap/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 "Plot.h"
+
+#include <QApplication>
+#include <QMainWindow>
+
+#ifndef QT_NO_FILEDIALOG
+#include <QToolBar>
+#include <QToolButton>
+#endif
+
+namespace
+{
+    class MainWindow : public QMainWindow
+    {
+      public:
+        MainWindow( const QString& fileName )
+        {
+            Plot* plot = new Plot( this );
+            if ( !fileName.isEmpty() )
+                plot->loadSVG( fileName );
+
+            setCentralWidget( plot );
+
+#ifndef QT_NO_FILEDIALOG
+
+            QToolButton* btnLoad = new QToolButton();
+            btnLoad->setText( "Load SVG" );
+            btnLoad->setToolButtonStyle( Qt::ToolButtonTextUnderIcon );
+
+            QToolBar* toolBar = new QToolBar();
+            toolBar->addWidget( btnLoad );
+            addToolBar( toolBar );
+
+            connect( btnLoad, SIGNAL(clicked()), plot, SLOT(loadSVG()) );
+#endif
+        }
+    };
+}
+
+int main( int argc, char* argv[] )
+{
+    QApplication app( argc, argv );
+
+    QString fileName;
+    if ( argc > 1 )
+    {
+        fileName = argv[1];
+    }
+    else
+    {
+        // see: https://commons.wikimedia.org/wiki/File:Schlosspark_Nymphenburg.svg
+        fileName = ":/svg/Schlosspark_Nymphenburg.svg";
+    }
+
+    MainWindow window( fileName );
+    window.resize( 600, 600 );
+    window.show();
+
+    return app.exec();
+}

playground/svgmap/svgmap.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   = svgmap
+QT      += svg
+
+RESOURCES += \
+    svgmap.qrc
+
+HEADERS = \
+    Plot.h
+
+SOURCES = \
+    Plot.cpp \
+    main.cpp

playground/svgmap/svgmap.qrc

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+<RCC>
+    <qresource prefix="/svg">
+        <file>Schlosspark_Nymphenburg.svg</file>
+    </qresource>
+</RCC>