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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"