彻底改版2.0
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feiyangqingyun
253
third/qwtdemo/examples/stockchart/plot.cpp
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253
third/qwtdemo/examples/stockchart/plot.cpp
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#include "plot.h"
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#include "legend.h"
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#include "griditem.h"
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#include "quotefactory.h"
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#include <qwt_legend.h>
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#include <qwt_plot_tradingcurve.h>
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#include <qwt_plot_marker.h>
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#include <qwt_plot_zoneitem.h>
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#include <qwt_plot_renderer.h>
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#include <qwt_plot_zoomer.h>
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#include <qwt_plot_panner.h>
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#include <qwt_legend_label.h>
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#include <qwt_date.h>
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#include <qwt_date_scale_engine.h>
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#include <qwt_date_scale_draw.h>
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class Zoomer: public QwtPlotZoomer
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{
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public:
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Zoomer( QWidget *canvas ):
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QwtPlotZoomer( canvas )
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{
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setRubberBandPen( QColor( Qt::darkGreen ) );
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setTrackerMode( QwtPlotPicker::AlwaysOn );
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}
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protected:
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virtual QwtText trackerTextF( const QPointF &pos ) const
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{
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const QDateTime dt = QwtDate::toDateTime( pos.x() );
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QString s;
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s += QwtDate::toString( QwtDate::toDateTime( pos.x() ),
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"MMM dd hh:mm ", QwtDate::FirstThursday );
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QwtText text( s );
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text.setColor( Qt::white );
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QColor c = rubberBandPen().color();
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text.setBorderPen( QPen( c ) );
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text.setBorderRadius( 6 );
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c.setAlpha( 170 );
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text.setBackgroundBrush( c );
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return text;
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}
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};
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class DateScaleDraw: public QwtDateScaleDraw
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{
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public:
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DateScaleDraw( Qt::TimeSpec timeSpec ):
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QwtDateScaleDraw( timeSpec )
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{
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// as we have dates from 2010 only we use
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// format strings without the year
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setDateFormat( QwtDate::Millisecond, "hh:mm:ss:zzz\nddd dd MMM" );
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setDateFormat( QwtDate::Second, "hh:mm:ss\nddd dd MMM" );
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setDateFormat( QwtDate::Minute, "hh:mm\nddd dd MMM" );
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setDateFormat( QwtDate::Hour, "hh:mm\nddd dd MMM" );
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setDateFormat( QwtDate::Day, "ddd dd MMM" );
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setDateFormat( QwtDate::Week, "Www" );
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setDateFormat( QwtDate::Month, "MMM" );
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}
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};
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class ZoneItem: public QwtPlotZoneItem
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{
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public:
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ZoneItem( const QString &title )
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{
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setTitle( title );
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setZ( 11 ); // on top the the grid
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setOrientation( Qt::Vertical );
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setItemAttribute( QwtPlotItem::Legend, true );
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}
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void setColor( const QColor &color )
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{
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QColor c = color;
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c.setAlpha( 100 );
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setPen( c );
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c.setAlpha( 20 );
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setBrush( c );
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}
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void setInterval( const QDate &date1, const QDate &date2 )
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{
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const QDateTime dt1( date1, QTime(), Qt::UTC );
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const QDateTime dt2( date2, QTime(), Qt::UTC );
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QwtPlotZoneItem::setInterval( QwtDate::toDouble( dt1 ),
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QwtDate::toDouble( dt2 ) );
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}
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};
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Plot::Plot( QWidget *parent ):
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QwtPlot( parent )
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{
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setTitle( "Trading Chart" );
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QwtDateScaleDraw *scaleDraw = new DateScaleDraw( Qt::UTC );
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QwtDateScaleEngine *scaleEngine = new QwtDateScaleEngine( Qt::UTC );
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setAxisTitle( QwtPlot::xBottom, QString( "2010" ) );
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setAxisScaleDraw( QwtPlot::xBottom, scaleDraw );
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setAxisScaleEngine( QwtPlot::xBottom, scaleEngine );
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setAxisLabelRotation( QwtPlot::xBottom, -50.0 );
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setAxisLabelAlignment( QwtPlot::xBottom, Qt::AlignLeft | Qt::AlignBottom );
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setAxisTitle( QwtPlot::yLeft, QString( "Price [EUR]" ) );
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#if 0
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QwtLegend *legend = new QwtLegend;
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legend->setDefaultItemMode( QwtLegendData::Checkable );
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insertLegend( legend, QwtPlot::RightLegend );
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#else
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Legend *legend = new Legend;
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insertLegend( legend, QwtPlot::RightLegend );
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#endif
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populate();
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// LeftButton for the zooming
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// MidButton for the panning
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// RightButton: zoom out by 1
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// Ctrl+RighButton: zoom out to full size
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Zoomer* zoomer = new Zoomer( canvas() );
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zoomer->setMousePattern( QwtEventPattern::MouseSelect2,
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Qt::RightButton, Qt::ControlModifier );
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zoomer->setMousePattern( QwtEventPattern::MouseSelect3,
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Qt::RightButton );
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QwtPlotPanner *panner = new QwtPlotPanner( canvas() );
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panner->setMouseButton( Qt::MidButton );
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connect( legend, SIGNAL( checked( QwtPlotItem *, bool, int ) ),
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SLOT( showItem( QwtPlotItem *, bool ) ) );
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}
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void Plot::populate()
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{
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GridItem *gridItem = new GridItem();
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#if 0
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gridItem->setOrientations( Qt::Horizontal );
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#endif
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gridItem->attach( this );
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const Qt::GlobalColor colors[] =
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{
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Qt::red,
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Qt::blue,
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Qt::darkCyan,
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Qt::darkMagenta,
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Qt::darkYellow
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};
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const int numColors = sizeof( colors ) / sizeof( colors[0] );
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for ( int i = 0; i < QuoteFactory::NumStocks; i++ )
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{
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QuoteFactory::Stock stock = static_cast<QuoteFactory::Stock>( i );
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QwtPlotTradingCurve *curve = new QwtPlotTradingCurve();
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curve->setTitle( QuoteFactory::title( stock ) );
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curve->setOrientation( Qt::Vertical );
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curve->setSamples( QuoteFactory::samples2010( stock ) );
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// as we have one sample per day a symbol width of
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// 12h avoids overlapping symbols. We also bound
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// the width, so that is is not scaled below 3 and
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// above 15 pixels.
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curve->setSymbolExtent( 12 * 3600 * 1000.0 );
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curve->setMinSymbolWidth( 3 );
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curve->setMaxSymbolWidth( 15 );
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const Qt::GlobalColor color = colors[ i % numColors ];
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curve->setSymbolPen( color );
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curve->setSymbolBrush( QwtPlotTradingCurve::Decreasing, color );
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curve->setSymbolBrush( QwtPlotTradingCurve::Increasing, Qt::white );
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curve->attach( this );
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showItem( curve, true );
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}
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for ( int i = 0; i < 2; i++ )
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{
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QwtPlotMarker *marker = new QwtPlotMarker();
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marker->setTitle( QString( "Event %1" ).arg( i + 1 ) );
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marker->setLineStyle( QwtPlotMarker::VLine );
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marker->setLinePen( colors[ i % numColors ], 0, Qt::DashLine );
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marker->setVisible( false );
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QDateTime dt( QDate( 2010, 1, 1 ) );
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dt = dt.addDays( 77 * ( i + 1 ) );
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marker->setValue( QwtDate::toDouble( dt ), 0.0 );
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marker->setItemAttribute( QwtPlotItem::Legend, true );
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marker->attach( this );
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}
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// to show how QwtPlotZoneItem works
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ZoneItem *zone1 = new ZoneItem( "Zone 1");
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zone1->setColor( Qt::darkBlue );
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zone1->setInterval( QDate( 2010, 3, 10 ), QDate( 2010, 3, 27 ) );
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zone1->setVisible( false );
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zone1->attach( this );
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ZoneItem *zone2 = new ZoneItem( "Zone 2");
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zone2->setColor( Qt::darkMagenta );
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zone2->setInterval( QDate( 2010, 8, 1 ), QDate( 2010, 8, 24 ) );
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zone2->setVisible( false );
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zone2->attach( this );
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}
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void Plot::setMode( int style )
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{
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QwtPlotTradingCurve::SymbolStyle symbolStyle =
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static_cast<QwtPlotTradingCurve::SymbolStyle>( style );
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QwtPlotItemList curves = itemList( QwtPlotItem::Rtti_PlotTradingCurve );
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for ( int i = 0; i < curves.size(); i++ )
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{
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QwtPlotTradingCurve *curve =
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static_cast<QwtPlotTradingCurve *>( curves[i] );
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curve->setSymbolStyle( symbolStyle );
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}
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replot();
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}
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void Plot::showItem( QwtPlotItem *item, bool on )
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{
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item->setVisible( on );
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replot();
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}
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void Plot::exportPlot()
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{
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QwtPlotRenderer renderer;
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renderer.exportTo( this, "stockchart.pdf" );
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}
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