691 lines
18 KiB
C++
691 lines
18 KiB
C++
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/* -*- 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_histogram.h"
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#include "qwt_plot.h"
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#include "qwt_painter.h"
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#include "qwt_column_symbol.h"
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#include "qwt_scale_map.h"
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#include <qstring.h>
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#include <qpainter.h>
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static inline bool qwtIsCombinable( const QwtInterval &d1,
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const QwtInterval &d2 )
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{
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if ( d1.isValid() && d2.isValid() )
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{
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if ( d1.maxValue() == d2.minValue() )
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{
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if ( !( d1.borderFlags() & QwtInterval::ExcludeMaximum
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&& d2.borderFlags() & QwtInterval::ExcludeMinimum ) )
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{
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return true;
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}
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}
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}
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return false;
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}
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class QwtPlotHistogram::PrivateData
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{
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public:
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PrivateData():
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baseline( 0.0 ),
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style( Columns ),
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symbol( NULL )
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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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double baseline;
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QPen pen;
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QBrush brush;
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QwtPlotHistogram::HistogramStyle style;
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const QwtColumnSymbol *symbol;
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};
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/*!
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Constructor
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\param title Title of the histogram.
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*/
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QwtPlotHistogram::QwtPlotHistogram( const QwtText &title ):
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QwtPlotSeriesItem( 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 histogram.
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*/
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QwtPlotHistogram::QwtPlotHistogram( const QString &title ):
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QwtPlotSeriesItem( title )
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{
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init();
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}
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//! Destructor
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QwtPlotHistogram::~QwtPlotHistogram()
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{
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delete d_data;
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}
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//! Initialize data members
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void QwtPlotHistogram::init()
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{
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d_data = new PrivateData();
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setData( new QwtIntervalSeriesData() );
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setItemAttribute( QwtPlotItem::AutoScale, true );
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setItemAttribute( QwtPlotItem::Legend, true );
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setZ( 20.0 );
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}
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/*!
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Set the histogram's drawing style
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\param style Histogram style
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\sa HistogramStyle, style()
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*/
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void QwtPlotHistogram::setStyle( HistogramStyle style )
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{
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if ( style != d_data->style )
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{
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d_data->style = style;
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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 Style of the histogram
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\sa HistogramStyle, setStyle()
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*/
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QwtPlotHistogram::HistogramStyle QwtPlotHistogram::style() const
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{
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return d_data->style;
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}
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/*!
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Build and assign a pen
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In Qt5 the default pen width is 1.0 ( 0.0 in Qt4 ) what makes it
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non cosmetic ( see QPen::isCosmetic() ). This method has been introduced
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to hide this incompatibility.
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\param color Pen color
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\param width Pen width
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\param style Pen style
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\sa pen(), brush()
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*/
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void QwtPlotHistogram::setPen( const QColor &color, qreal width, Qt::PenStyle style )
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{
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setPen( QPen( color, width, style ) );
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}
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/*!
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Assign a pen, that is used in a style() depending way.
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\param pen New pen
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\sa pen(), brush()
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*/
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void QwtPlotHistogram::setPen( const QPen &pen )
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{
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if ( pen != d_data->pen )
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{
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d_data->pen = pen;
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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 Pen used in a style() depending way.
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\sa setPen(), brush()
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*/
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const QPen &QwtPlotHistogram::pen() const
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{
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return d_data->pen;
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}
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/*!
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Assign a brush, that is used in a style() depending way.
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\param brush New brush
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\sa pen(), brush()
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*/
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void QwtPlotHistogram::setBrush( const QBrush &brush )
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{
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if ( brush != d_data->brush )
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{
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d_data->brush = brush;
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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 Brush used in a style() depending way.
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\sa setPen(), brush()
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*/
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const QBrush &QwtPlotHistogram::brush() const
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{
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return d_data->brush;
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}
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/*!
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\brief Assign a symbol
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In Column style an optional symbol can be assigned, that is responsible
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for displaying the rectangle that is defined by the interval and
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the distance between baseline() and value. When no symbol has been
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defined the area is displayed as plain rectangle using pen() and brush().
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\sa style(), symbol(), drawColumn(), pen(), brush()
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\note In applications, where different intervals need to be displayed
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in a different way ( f.e different colors or even using different symbols)
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it is recommended to overload drawColumn().
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*/
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void QwtPlotHistogram::setSymbol( const 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 *QwtPlotHistogram::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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\brief Set the value of the baseline
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Each column representing an QwtIntervalSample is defined by its
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interval and the interval between baseline and the value of the sample.
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The default value of the baseline is 0.0.
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\param value Value of the baseline
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\sa baseline()
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*/
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void QwtPlotHistogram::setBaseline( double value )
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{
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if ( d_data->baseline != value )
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{
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d_data->baseline = value;
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itemChanged();
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}
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}
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/*!
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\return Value of the baseline
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\sa setBaseline()
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*/
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double QwtPlotHistogram::baseline() const
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{
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return d_data->baseline;
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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 QwtPlotHistogram::boundingRect() const
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{
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QRectF rect = data()->boundingRect();
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if ( !rect.isValid() )
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return rect;
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if ( orientation() == Qt::Horizontal )
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{
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rect = QRectF( rect.y(), rect.x(),
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rect.height(), rect.width() );
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if ( rect.left() > d_data->baseline )
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rect.setLeft( d_data->baseline );
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else if ( rect.right() < d_data->baseline )
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rect.setRight( d_data->baseline );
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}
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else
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{
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if ( rect.bottom() < d_data->baseline )
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rect.setBottom( d_data->baseline );
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else if ( rect.top() > d_data->baseline )
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rect.setTop( d_data->baseline );
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}
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return rect;
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}
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//! \return QwtPlotItem::Rtti_PlotHistogram
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int QwtPlotHistogram::rtti() const
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{
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return QwtPlotItem::Rtti_PlotHistogram;
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}
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/*!
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Initialize data with an array of samples.
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\param samples Vector of points
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*/
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void QwtPlotHistogram::setSamples(
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const QVector<QwtIntervalSample> &samples )
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{
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setData( new QwtIntervalSeriesData( samples ) );
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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 QwtPlotHistogram::setSamples(
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QwtSeriesData<QwtIntervalSample> *data )
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{
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setData( data );
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}
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/*!
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Draw a subset of the histogram samples
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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 rectangle of the canvas
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\param from Index of the first sample to be painted
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\param to Index of the last sample to be painted. If to < 0 the
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series will be painted to its last sample.
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\sa drawOutline(), drawLines(), drawColumns
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*/
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void QwtPlotHistogram::drawSeries( QPainter *painter,
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const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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const QRectF &, int from, int to ) const
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{
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if ( !painter || dataSize() <= 0 )
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return;
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if ( to < 0 )
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to = dataSize() - 1;
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switch ( d_data->style )
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{
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case Outline:
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drawOutline( painter, xMap, yMap, from, to );
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break;
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case Lines:
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drawLines( painter, xMap, yMap, from, to );
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break;
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case Columns:
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drawColumns( painter, xMap, yMap, from, to );
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break;
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default:
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break;
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}
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}
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/*!
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Draw a histogram in Outline style()
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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 from Index of the first sample to be painted
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\param to Index of the last sample to be painted. If to < 0 the
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histogram will be painted to its last point.
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\sa setStyle(), style()
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\warning The outline style requires, that the intervals are in increasing
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order and not overlapping.
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*/
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void QwtPlotHistogram::drawOutline( QPainter *painter,
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const QwtScaleMap &xMap, const QwtScaleMap &yMap,
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int from, int to ) const
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{
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const bool doAlign = QwtPainter::roundingAlignment( painter );
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double v0 = ( orientation() == Qt::Horizontal ) ?
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xMap.transform( baseline() ) : yMap.transform( baseline() );
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if ( doAlign )
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v0 = qRound( v0 );
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QwtIntervalSample previous;
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QPolygonF polygon;
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for ( int i = from; i <= to; i++ )
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{
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const QwtIntervalSample sample = this->sample( i );
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if ( !sample.interval.isValid() )
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{
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flushPolygon( painter, v0, polygon );
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previous = sample;
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continue;
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}
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if ( previous.interval.isValid() )
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{
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if ( !qwtIsCombinable( previous.interval, sample.interval ) )
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flushPolygon( painter, v0, polygon );
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}
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if ( orientation() == Qt::Vertical )
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{
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double x1 = xMap.transform( sample.interval.minValue() );
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double x2 = xMap.transform( sample.interval.maxValue() );
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double y = yMap.transform( sample.value );
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if ( doAlign )
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{
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x1 = qRound( x1 );
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x2 = qRound( x2 );
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y = qRound( y );
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}
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if ( polygon.size() == 0 )
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polygon += QPointF( x1, v0 );
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polygon += QPointF( x1, y );
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polygon += QPointF( x2, y );
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}
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else
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|
{
|
||
|
|
double y1 = yMap.transform( sample.interval.minValue() );
|
||
|
|
double y2 = yMap.transform( sample.interval.maxValue() );
|
||
|
|
double x = xMap.transform( sample.value );
|
||
|
|
if ( doAlign )
|
||
|
|
{
|
||
|
|
y1 = qRound( y1 );
|
||
|
|
y2 = qRound( y2 );
|
||
|
|
x = qRound( x );
|
||
|
|
}
|
||
|
|
|
||
|
|
if ( polygon.size() == 0 )
|
||
|
|
polygon += QPointF( v0, y1 );
|
||
|
|
|
||
|
|
polygon += QPointF( x, y1 );
|
||
|
|
polygon += QPointF( x, y2 );
|
||
|
|
}
|
||
|
|
previous = sample;
|
||
|
|
}
|
||
|
|
|
||
|
|
flushPolygon( painter, v0, polygon );
|
||
|
|
}
|
||
|
|
|
||
|
|
/*!
|
||
|
|
Draw a histogram in Columns style()
|
||
|
|
|
||
|
|
\param painter Painter
|
||
|
|
\param xMap Maps x-values into pixel coordinates.
|
||
|
|
\param yMap Maps y-values into pixel coordinates.
|
||
|
|
\param from Index of the first sample to be painted
|
||
|
|
\param to Index of the last sample to be painted. If to < 0 the
|
||
|
|
histogram will be painted to its last point.
|
||
|
|
|
||
|
|
\sa setStyle(), style(), setSymbol(), drawColumn()
|
||
|
|
*/
|
||
|
|
void QwtPlotHistogram::drawColumns( QPainter *painter,
|
||
|
|
const QwtScaleMap &xMap, const QwtScaleMap &yMap,
|
||
|
|
int from, int to ) const
|
||
|
|
{
|
||
|
|
painter->setPen( d_data->pen );
|
||
|
|
painter->setBrush( d_data->brush );
|
||
|
|
|
||
|
|
const QwtSeriesData<QwtIntervalSample> *series = data();
|
||
|
|
|
||
|
|
for ( int i = from; i <= to; i++ )
|
||
|
|
{
|
||
|
|
const QwtIntervalSample sample = series->sample( i );
|
||
|
|
if ( !sample.interval.isNull() )
|
||
|
|
{
|
||
|
|
const QwtColumnRect rect = columnRect( sample, xMap, yMap );
|
||
|
|
drawColumn( painter, rect, sample );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*!
|
||
|
|
Draw a histogram in Lines style()
|
||
|
|
|
||
|
|
\param painter Painter
|
||
|
|
\param xMap Maps x-values into pixel coordinates.
|
||
|
|
\param yMap Maps y-values into pixel coordinates.
|
||
|
|
\param from Index of the first sample to be painted
|
||
|
|
\param to Index of the last sample to be painted. If to < 0 the
|
||
|
|
histogram will be painted to its last point.
|
||
|
|
|
||
|
|
\sa setStyle(), style(), setPen()
|
||
|
|
*/
|
||
|
|
void QwtPlotHistogram::drawLines( QPainter *painter,
|
||
|
|
const QwtScaleMap &xMap, const QwtScaleMap &yMap,
|
||
|
|
int from, int to ) const
|
||
|
|
{
|
||
|
|
const bool doAlign = QwtPainter::roundingAlignment( painter );
|
||
|
|
|
||
|
|
painter->setPen( d_data->pen );
|
||
|
|
painter->setBrush( Qt::NoBrush );
|
||
|
|
|
||
|
|
const QwtSeriesData<QwtIntervalSample> *series = data();
|
||
|
|
|
||
|
|
for ( int i = from; i <= to; i++ )
|
||
|
|
{
|
||
|
|
const QwtIntervalSample sample = series->sample( i );
|
||
|
|
if ( !sample.interval.isNull() )
|
||
|
|
{
|
||
|
|
const QwtColumnRect rect = columnRect( sample, xMap, yMap );
|
||
|
|
|
||
|
|
QRectF r = rect.toRect();
|
||
|
|
if ( doAlign )
|
||
|
|
{
|
||
|
|
r.setLeft( qRound( r.left() ) );
|
||
|
|
r.setRight( qRound( r.right() ) );
|
||
|
|
r.setTop( qRound( r.top() ) );
|
||
|
|
r.setBottom( qRound( r.bottom() ) );
|
||
|
|
}
|
||
|
|
|
||
|
|
switch ( rect.direction )
|
||
|
|
{
|
||
|
|
case QwtColumnRect::LeftToRight:
|
||
|
|
{
|
||
|
|
QwtPainter::drawLine( painter,
|
||
|
|
r.topRight(), r.bottomRight() );
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
case QwtColumnRect::RightToLeft:
|
||
|
|
{
|
||
|
|
QwtPainter::drawLine( painter,
|
||
|
|
r.topLeft(), r.bottomLeft() );
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
case QwtColumnRect::TopToBottom:
|
||
|
|
{
|
||
|
|
QwtPainter::drawLine( painter,
|
||
|
|
r.bottomRight(), r.bottomLeft() );
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
case QwtColumnRect::BottomToTop:
|
||
|
|
{
|
||
|
|
QwtPainter::drawLine( painter,
|
||
|
|
r.topRight(), r.topLeft() );
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//! Internal, used by the Outline style.
|
||
|
|
void QwtPlotHistogram::flushPolygon( QPainter *painter,
|
||
|
|
double baseLine, QPolygonF &polygon ) const
|
||
|
|
{
|
||
|
|
if ( polygon.size() == 0 )
|
||
|
|
return;
|
||
|
|
|
||
|
|
if ( orientation() == Qt::Horizontal )
|
||
|
|
polygon += QPointF( baseLine, polygon.last().y() );
|
||
|
|
else
|
||
|
|
polygon += QPointF( polygon.last().x(), baseLine );
|
||
|
|
|
||
|
|
if ( d_data->brush.style() != Qt::NoBrush )
|
||
|
|
{
|
||
|
|
painter->setPen( Qt::NoPen );
|
||
|
|
painter->setBrush( d_data->brush );
|
||
|
|
|
||
|
|
if ( orientation() == Qt::Horizontal )
|
||
|
|
{
|
||
|
|
polygon += QPointF( polygon.last().x(), baseLine );
|
||
|
|
polygon += QPointF( polygon.first().x(), baseLine );
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
polygon += QPointF( baseLine, polygon.last().y() );
|
||
|
|
polygon += QPointF( baseLine, polygon.first().y() );
|
||
|
|
}
|
||
|
|
|
||
|
|
QwtPainter::drawPolygon( painter, polygon );
|
||
|
|
|
||
|
|
polygon.pop_back();
|
||
|
|
polygon.pop_back();
|
||
|
|
}
|
||
|
|
if ( d_data->pen.style() != Qt::NoPen )
|
||
|
|
{
|
||
|
|
painter->setBrush( Qt::NoBrush );
|
||
|
|
painter->setPen( d_data->pen );
|
||
|
|
QwtPainter::drawPolyline( painter, polygon );
|
||
|
|
}
|
||
|
|
polygon.clear();
|
||
|
|
}
|
||
|
|
|
||
|
|
/*!
|
||
|
|
Calculate the area that is covered by a sample
|
||
|
|
|
||
|
|
\param sample Sample
|
||
|
|
\param xMap Maps x-values into pixel coordinates.
|
||
|
|
\param yMap Maps y-values into pixel coordinates.
|
||
|
|
|
||
|
|
\return Rectangle, that is covered by a sample
|
||
|
|
*/
|
||
|
|
QwtColumnRect QwtPlotHistogram::columnRect( const QwtIntervalSample &sample,
|
||
|
|
const QwtScaleMap &xMap, const QwtScaleMap &yMap ) const
|
||
|
|
{
|
||
|
|
QwtColumnRect rect;
|
||
|
|
|
||
|
|
const QwtInterval &iv = sample.interval;
|
||
|
|
if ( !iv.isValid() )
|
||
|
|
return rect;
|
||
|
|
|
||
|
|
if ( orientation() == Qt::Horizontal )
|
||
|
|
{
|
||
|
|
const double x0 = xMap.transform( baseline() );
|
||
|
|
const double x = xMap.transform( sample.value );
|
||
|
|
const double y1 = yMap.transform( iv.minValue() );
|
||
|
|
const double y2 = yMap.transform( iv.maxValue() );
|
||
|
|
|
||
|
|
rect.hInterval.setInterval( x0, x );
|
||
|
|
rect.vInterval.setInterval( y1, y2, iv.borderFlags() );
|
||
|
|
rect.direction = ( x < x0 ) ? QwtColumnRect::RightToLeft :
|
||
|
|
QwtColumnRect::LeftToRight;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
const double x1 = xMap.transform( iv.minValue() );
|
||
|
|
const double x2 = xMap.transform( iv.maxValue() );
|
||
|
|
const double y0 = yMap.transform( baseline() );
|
||
|
|
const double y = yMap.transform( sample.value );
|
||
|
|
|
||
|
|
rect.hInterval.setInterval( x1, x2, iv.borderFlags() );
|
||
|
|
rect.vInterval.setInterval( y0, y );
|
||
|
|
rect.direction = ( y < y0 ) ? QwtColumnRect::BottomToTop :
|
||
|
|
QwtColumnRect::TopToBottom;
|
||
|
|
}
|
||
|
|
|
||
|
|
return rect;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*!
|
||
|
|
Draw a column for a sample in Columns style().
|
||
|
|
|
||
|
|
When a symbol() has been set the symbol is used otherwise the
|
||
|
|
column is displayed as plain rectangle using pen() and brush().
|
||
|
|
|
||
|
|
\param painter Painter
|
||
|
|
\param rect Rectangle where to paint the column in paint device coordinates
|
||
|
|
\param sample Sample to be displayed
|
||
|
|
|
||
|
|
\note In applications, where different intervals need to be displayed
|
||
|
|
in a different way ( f.e different colors or even using different symbols)
|
||
|
|
it is recommended to overload drawColumn().
|
||
|
|
*/
|
||
|
|
void QwtPlotHistogram::drawColumn( QPainter *painter,
|
||
|
|
const QwtColumnRect &rect, const QwtIntervalSample &sample ) const
|
||
|
|
{
|
||
|
|
Q_UNUSED( sample );
|
||
|
|
|
||
|
|
if ( d_data->symbol &&
|
||
|
|
( d_data->symbol->style() != QwtColumnSymbol::NoStyle ) )
|
||
|
|
{
|
||
|
|
d_data->symbol->draw( painter, rect );
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
QRectF r = rect.toRect();
|
||
|
|
if ( QwtPainter::roundingAlignment( painter ) )
|
||
|
|
{
|
||
|
|
r.setLeft( qRound( r.left() ) );
|
||
|
|
r.setRight( qRound( r.right() ) );
|
||
|
|
r.setTop( qRound( r.top() ) );
|
||
|
|
r.setBottom( qRound( r.bottom() ) );
|
||
|
|
}
|
||
|
|
|
||
|
|
QwtPainter::drawRect( painter, r );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*!
|
||
|
|
A plain rectangle without pen using the brush()
|
||
|
|
|
||
|
|
\param index Index of the legend entry
|
||
|
|
( ignored as there is only one )
|
||
|
|
\param size Icon size
|
||
|
|
\return A graphic displaying the icon
|
||
|
|
|
||
|
|
\sa QwtPlotItem::setLegendIconSize(), QwtPlotItem::legendData()
|
||
|
|
*/
|
||
|
|
QwtGraphic QwtPlotHistogram::legendIcon( int index,
|
||
|
|
const QSizeF &size ) const
|
||
|
|
{
|
||
|
|
Q_UNUSED( index );
|
||
|
|
return defaultIcon( d_data->brush, size );
|
||
|
|
}
|