460 lines
11 KiB
C++
460 lines
11 KiB
C++
/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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* Qwt Widget Library
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* Copyright (C) 1997 Josef Wilgen
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* Copyright (C) 2002 Uwe Rathmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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#include "qwt_plot_barchart.h"
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#include "qwt_scale_map.h"
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#include "qwt_column_symbol.h"
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#include "qwt_painter.h"
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#include <qpainter.h>
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class QwtPlotBarChart::PrivateData
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{
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public:
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PrivateData():
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symbol( NULL ),
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legendMode( QwtPlotBarChart::LegendChartTitle )
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{
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}
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~PrivateData()
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{
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delete symbol;
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}
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QwtColumnSymbol *symbol;
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QwtPlotBarChart::LegendMode legendMode;
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};
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/*!
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Constructor
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\param title Title of the curve
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*/
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QwtPlotBarChart::QwtPlotBarChart( const QwtText &title ):
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QwtPlotAbstractBarChart( title )
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{
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init();
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}
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/*!
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Constructor
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\param title Title of the curve
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*/
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QwtPlotBarChart::QwtPlotBarChart( const QString &title ):
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QwtPlotAbstractBarChart( QwtText( title ) )
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{
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init();
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}
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//! Destructor
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QwtPlotBarChart::~QwtPlotBarChart()
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{
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delete d_data;
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}
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void QwtPlotBarChart::init()
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{
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d_data = new PrivateData;
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setData( new QwtPointSeriesData() );
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}
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//! \return QwtPlotItem::Rtti_PlotBarChart
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int QwtPlotBarChart::rtti() const
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{
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return QwtPlotItem::Rtti_PlotBarChart;
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}
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/*!
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Initialize data with an array of points
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\param samples Vector of points
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\note QVector is implicitly shared
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\note QPolygonF is derived from QVector<QPointF>
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*/
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void QwtPlotBarChart::setSamples(
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const QVector<QPointF> &samples )
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{
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setData( new QwtPointSeriesData( samples ) );
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}
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/*!
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Initialize data with an array of doubles
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The indices in the array are taken as x coordinate,
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while the doubles are interpreted as y values.
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\param samples Vector of y coordinates
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\note QVector is implicitly shared
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*/
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void QwtPlotBarChart::setSamples(
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const QVector<double> &samples )
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{
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QVector<QPointF> points;
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for ( int i = 0; i < samples.size(); i++ )
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points += QPointF( i, samples[ i ] );
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setData( new QwtPointSeriesData( points ) );
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}
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/*!
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Assign a series of samples
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setSamples() is just a wrapper for setData() without any additional
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value - beside that it is easier to find for the developer.
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\param data Data
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\warning The item takes ownership of the data object, deleting
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it when its not used anymore.
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*/
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void QwtPlotBarChart::setSamples( QwtSeriesData<QPointF> *data )
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{
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setData( data );
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}
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/*!
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\brief Assign a symbol
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The bar chart will take the ownership of the symbol, hence the previously
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set symbol will be delete by setting a new one. If \p symbol is
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\c NULL no symbol will be drawn.
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\param symbol Symbol
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\sa symbol()
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*/
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void QwtPlotBarChart::setSymbol( QwtColumnSymbol *symbol )
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{
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if ( symbol != d_data->symbol )
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{
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delete d_data->symbol;
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d_data->symbol = symbol;
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legendChanged();
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itemChanged();
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}
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}
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/*!
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\return Current symbol or NULL, when no symbol has been assigned
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\sa setSymbol()
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*/
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const QwtColumnSymbol *QwtPlotBarChart::symbol() const
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{
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return d_data->symbol;
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}
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/*!
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Set the mode that decides what to display on the legend
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In case of LegendBarTitles barTitle() needs to be overloaded
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to return individual titles for each bar.
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\param mode New mode
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\sa legendMode(), legendData(), barTitle(), QwtPlotItem::ItemAttribute
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*/
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void QwtPlotBarChart::setLegendMode( LegendMode mode )
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{
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if ( mode != d_data->legendMode )
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{
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d_data->legendMode = mode;
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legendChanged();
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}
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}
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/*!
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\return Legend mode
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\sa setLegendMode()
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*/
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QwtPlotBarChart::LegendMode QwtPlotBarChart::legendMode() const
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{
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return d_data->legendMode;
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}
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/*!
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\return Bounding rectangle of all samples.
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For an empty series the rectangle is invalid.
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*/
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QRectF QwtPlotBarChart::boundingRect() const
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{
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const size_t numSamples = dataSize();
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if ( numSamples == 0 )
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return QwtPlotSeriesItem::boundingRect();
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QRectF rect = QwtPlotSeriesItem::boundingRect();
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if ( rect.height() >= 0 )
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{
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const double baseLine = baseline();
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if ( rect.bottom() < baseLine )
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rect.setBottom( baseLine );
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if ( rect.top() > baseLine )
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rect.setTop( baseLine );
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}
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if ( orientation() == Qt::Horizontal )
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rect.setRect( rect.y(), rect.x(), rect.height(), rect.width() );
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return rect;
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}
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/*!
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Draw an interval of the bar chart
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\param painter Painter
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\param xMap Maps x-values into pixel coordinates.
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\param yMap Maps y-values into pixel coordinates.
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\param canvasRect Contents rect of the canvas
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\param from Index of the first point to be painted
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\param to Index of the last point to be painted. If to < 0 the
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curve will be painted to its last point.
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\sa drawSymbols()
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*/
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void QwtPlotBarChart::drawSeries( QPainter *painter,
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const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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const QRectF &canvasRect, int from, int to ) const
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{
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if ( to < 0 )
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to = dataSize() - 1;
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if ( from < 0 )
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from = 0;
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if ( from > to )
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return;
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const QRectF br = data()->boundingRect();
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const QwtInterval interval( br.left(), br.right() );
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painter->save();
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for ( int i = from; i <= to; i++ )
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{
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drawSample( painter, xMap, yMap,
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canvasRect, interval, i, sample( i ) );
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}
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painter->restore();
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}
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/*!
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Draw a sample
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\param painter Painter
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\param xMap x map
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\param yMap y map
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\param canvasRect Contents rect of the canvas
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\param boundingInterval Bounding interval of sample values
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\param index Index of the sample
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\param sample Value of the sample
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\sa drawSeries()
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*/
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void QwtPlotBarChart::drawSample( QPainter *painter,
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const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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const QRectF &canvasRect, const QwtInterval &boundingInterval,
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int index, const QPointF &sample ) const
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{
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QwtColumnRect barRect;
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if ( orientation() == Qt::Horizontal )
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{
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const double barHeight = sampleWidth( yMap, canvasRect.height(),
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boundingInterval.width(), sample.y() );
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const double x1 = xMap.transform( baseline() );
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const double x2 = xMap.transform( sample.y() );
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const double y = yMap.transform( sample.x() );
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const double y1 = y - 0.5 * barHeight;
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const double y2 = y + 0.5 * barHeight;
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barRect.direction = ( x1 < x2 ) ?
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QwtColumnRect::LeftToRight : QwtColumnRect::RightToLeft;
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barRect.hInterval = QwtInterval( x1, x2 ).normalized();
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barRect.vInterval = QwtInterval( y1, y2 );
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}
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else
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{
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const double barWidth = sampleWidth( xMap, canvasRect.width(),
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boundingInterval.width(), sample.y() );
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const double x = xMap.transform( sample.x() );
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const double x1 = x - 0.5 * barWidth;
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const double x2 = x + 0.5 * barWidth;
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const double y1 = yMap.transform( baseline() );
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const double y2 = yMap.transform( sample.y() );
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barRect.direction = ( y1 < y2 ) ?
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QwtColumnRect::TopToBottom : QwtColumnRect::BottomToTop;
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barRect.hInterval = QwtInterval( x1, x2 );
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barRect.vInterval = QwtInterval( y1, y2 ).normalized();
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}
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drawBar( painter, index, sample, barRect );
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}
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/*!
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Draw a bar
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\param painter Painter
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\param sampleIndex Index of the sample represented by the bar
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\param sample Value of the sample
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\param rect Bounding rectangle of the bar
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*/
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void QwtPlotBarChart::drawBar( QPainter *painter,
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int sampleIndex, const QPointF &sample,
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const QwtColumnRect &rect ) const
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{
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const QwtColumnSymbol *specialSym =
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specialSymbol( sampleIndex, sample );
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const QwtColumnSymbol *sym = specialSym;
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if ( sym == NULL )
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sym = d_data->symbol;
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if ( sym )
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{
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sym->draw( painter, rect );
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}
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else
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{
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// we build a temporary default symbol
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QwtColumnSymbol sym( QwtColumnSymbol::Box );
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sym.setLineWidth( 1 );
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sym.setFrameStyle( QwtColumnSymbol::Plain );
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sym.draw( painter, rect );
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}
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delete specialSym;
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}
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/*!
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Needs to be overloaded to return a
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non default symbol for a specific sample
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\param sampleIndex Index of the sample represented by the bar
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\param sample Value of the sample
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\return NULL, indicating to use the default symbol
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*/
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QwtColumnSymbol *QwtPlotBarChart::specialSymbol(
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int sampleIndex, const QPointF &sample ) const
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{
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Q_UNUSED( sampleIndex );
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Q_UNUSED( sample );
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return NULL;
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}
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/*!
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\brief Return the title of a bar
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In LegendBarTitles mode the title is displayed on
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the legend entry corresponding to a bar.
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The default implementation is a dummy, that is intended
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to be overloaded.
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\param sampleIndex Index of the bar
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\return An empty text
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\sa LegendBarTitles
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*/
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QwtText QwtPlotBarChart::barTitle( int sampleIndex ) const
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{
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Q_UNUSED( sampleIndex );
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return QwtText();
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}
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/*!
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\brief Return all information, that is needed to represent
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the item on the legend
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In case of LegendBarTitles an entry for each bar is returned,
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otherwise the chart is represented like any other plot item
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from its title() and the legendIcon().
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\return Information, that is needed to represent the item on the legend
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\sa title(), setLegendMode(), barTitle(), QwtLegend, QwtPlotLegendItem
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*/
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QList<QwtLegendData> QwtPlotBarChart::legendData() const
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{
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QList<QwtLegendData> list;
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if ( d_data->legendMode == LegendBarTitles )
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{
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const size_t numSamples = dataSize();
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for ( size_t i = 0; i < numSamples; i++ )
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{
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QwtLegendData data;
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QVariant titleValue;
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qVariantSetValue( titleValue, barTitle( i ) );
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data.setValue( QwtLegendData::TitleRole, titleValue );
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if ( !legendIconSize().isEmpty() )
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{
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QVariant iconValue;
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qVariantSetValue( iconValue,
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legendIcon( i, legendIconSize() ) );
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data.setValue( QwtLegendData::IconRole, iconValue );
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}
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list += data;
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}
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}
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else
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{
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return QwtPlotAbstractBarChart::legendData();
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}
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return list;
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}
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/*!
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\return Icon representing a bar or the chart on the legend
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When the legendMode() is LegendBarTitles the icon shows
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the bar corresponding to index - otherwise the bar
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displays the default symbol.
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\param index Index of the legend entry
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\param size Icon size
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\sa setLegendMode(), drawBar(),
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QwtPlotItem::setLegendIconSize(), QwtPlotItem::legendData()
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*/
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QwtGraphic QwtPlotBarChart::legendIcon(
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int index, const QSizeF &size ) const
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{
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QwtColumnRect column;
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column.hInterval = QwtInterval( 0.0, size.width() - 1.0 );
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column.vInterval = QwtInterval( 0.0, size.height() - 1.0 );
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QwtGraphic icon;
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icon.setDefaultSize( size );
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icon.setRenderHint( QwtGraphic::RenderPensUnscaled, true );
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QPainter painter( &icon );
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painter.setRenderHint( QPainter::Antialiasing,
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testRenderHint( QwtPlotItem::RenderAntialiased ) );
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int barIndex = -1;
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if ( d_data->legendMode == QwtPlotBarChart::LegendBarTitles )
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barIndex = index;
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drawBar( &painter, barIndex, QPointF(), column );
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return icon;
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}
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