104 lines
2.3 KiB
C++
104 lines
2.3 KiB
C++
/*****************************************************************************
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* Qwt Examples - Copyright (C) 2002 Uwe Rathmann
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* This file may be used under the terms of the 3-clause BSD License
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*****************************************************************************/
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#include "Plot.h"
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#include <QwtPlotGraphicItem>
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#include <QwtPlotLayout>
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#include <QwtPlotPanner>
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#include <QwtPlotMagnifier>
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#include <QwtGraphic>
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#define DEBUG_SCALE 0
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#if DEBUG_SCALE
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#include <QwtPlotGrid>
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#endif
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#include <QSvgRenderer>
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#include <QFileDialog>
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Plot::Plot( QWidget* parent )
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: QwtPlot( parent )
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, m_mapItem( NULL )
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, m_mapRect( 0.0, 0.0, 100.0, 100.0 ) // something
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{
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#if DEBUG_SCALE
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QwtPlotGrid* grid = new QwtPlotGrid();
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grid->attach( this );
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#else
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/*
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m_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 axisPos = 0; axisPos < QwtAxis::AxisPositions; axisPos++ )
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setAxisVisible( axisPos, false );
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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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setCanvasBackground( Qt::white );
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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 ( m_mapItem == NULL )
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{
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m_mapItem = new QwtPlotGraphicItem();
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m_mapItem->attach( this );
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}
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QwtGraphic graphic;
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QSvgRenderer renderer;
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if ( renderer.load( fileName ) )
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{
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QPainter p( &graphic );
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renderer.render( &p );
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}
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m_mapItem->setGraphic( m_mapRect, graphic );
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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( QwtAxis::XBottom, m_mapRect.left(), m_mapRect.right() );
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setAxisScale( QwtAxis::YLeft, m_mapRect.top(), m_mapRect.bottom() );
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}
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#include "moc_Plot.cpp"
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