79 lines
1.7 KiB
C++
79 lines
1.7 KiB
C++
#include <qfiledialog.h>
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#include <qwt_plot_svgitem.h>
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#include <qwt_plot_grid.h>
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#include <qwt_plot_layout.h>
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#include <qwt_plot_canvas.h>
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#include <qwt_plot_panner.h>
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#include <qwt_plot_magnifier.h>
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#include "plot.h"
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Plot::Plot( QWidget *parent ):
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QwtPlot( parent ),
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d_mapItem( NULL ),
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d_mapRect( 0.0, 0.0, 100.0, 100.0 ) // something
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{
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#if 1
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/*
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d_mapRect is only a reference for zooming, but
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the ranges are nothing useful for the user. So we
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hide the axes.
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*/
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plotLayout()->setCanvasMargin( 0 );
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for ( int axis = 0; axis < QwtPlot::axisCnt; axis++ )
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enableAxis( axis, false );
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#else
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QwtPlotGrid *grid = new QwtPlotGrid();
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grid->attach( this );
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#endif
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/*
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Navigation:
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Left Mouse Button: Panning
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Mouse Wheel: Zooming In/Out
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Right Mouse Button: Reset to initial
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*/
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( void )new QwtPlotPanner( canvas() );
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( void )new QwtPlotMagnifier( canvas() );
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canvas()->setFocusPolicy( Qt::WheelFocus );
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rescale();
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}
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#ifndef QT_NO_FILEDIALOG
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void Plot::loadSVG()
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{
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QString dir;
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const QString fileName = QFileDialog::getOpenFileName( NULL,
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"Load a Scaleable Vector Graphic (SVG) Map",
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dir, "SVG Files (*.svg)" );
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if ( !fileName.isEmpty() )
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loadSVG( fileName );
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}
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#endif
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void Plot::loadSVG( const QString &fileName )
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{
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if ( d_mapItem == NULL )
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{
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d_mapItem = new QwtPlotSvgItem();
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d_mapItem->attach( this );
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}
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d_mapItem->loadFile( d_mapRect, fileName );
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rescale();
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replot();
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}
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void Plot::rescale()
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{
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setAxisScale( QwtPlot::xBottom,
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d_mapRect.left(), d_mapRect.right() );
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setAxisScale( QwtPlot::yLeft,
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d_mapRect.top(), d_mapRect.bottom() );
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}
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