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33fc476d89
* require qwt >=6.2 (and fallback to internal 6.3 if system's qwt doesn't suffice) * debian doesn't have qwt for Qt6 and won't have it for trixie
444 lines
9.8 KiB
C++
444 lines
9.8 KiB
C++
/******************************************************************************
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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_grid.h"
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#include "qwt_painter.h"
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#include "qwt_text.h"
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#include "qwt_scale_map.h"
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#include "qwt_scale_div.h"
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#include <qpainter.h>
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#include <qpen.h>
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static inline bool qwtFuzzyGreaterOrEqual( double d1, double d2 )
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{
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return ( d1 >= d2 ) || qFuzzyCompare( d1, d2 );
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}
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class QwtPlotGrid::PrivateData
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{
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public:
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PrivateData()
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: xEnabled( true )
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, yEnabled( true )
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, xMinEnabled( false )
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, yMinEnabled( false )
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{
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}
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bool xEnabled;
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bool yEnabled;
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bool xMinEnabled;
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bool yMinEnabled;
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QwtScaleDiv xScaleDiv;
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QwtScaleDiv yScaleDiv;
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QPen majorPen;
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QPen minorPen;
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};
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//! Enables major grid, disables minor grid
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QwtPlotGrid::QwtPlotGrid()
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: QwtPlotItem( QwtText( "Grid" ) )
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{
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m_data = new PrivateData;
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setItemInterest( QwtPlotItem::ScaleInterest, true );
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setZ( 10.0 );
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}
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//! Destructor
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QwtPlotGrid::~QwtPlotGrid()
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{
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delete m_data;
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}
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//! \return QwtPlotItem::Rtti_PlotGrid
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int QwtPlotGrid::rtti() const
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{
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return QwtPlotItem::Rtti_PlotGrid;
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}
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/*!
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\brief Enable or disable vertical grid lines
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\param on Enable (true) or disable
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\sa Minor grid lines can be enabled or disabled with
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enableXMin()
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*/
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void QwtPlotGrid::enableX( bool on )
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{
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if ( m_data->xEnabled != on )
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{
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m_data->xEnabled = on;
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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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\brief Enable or disable horizontal grid lines
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\param on Enable (true) or disable
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\sa Minor grid lines can be enabled or disabled with enableYMin()
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*/
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void QwtPlotGrid::enableY( bool on )
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{
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if ( m_data->yEnabled != on )
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{
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m_data->yEnabled = on;
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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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\brief Enable or disable minor vertical grid lines.
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\param on Enable (true) or disable
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\sa enableX()
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*/
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void QwtPlotGrid::enableXMin( bool on )
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{
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if ( m_data->xMinEnabled != on )
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{
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m_data->xMinEnabled = on;
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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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\brief Enable or disable minor horizontal grid lines
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\param on Enable (true) or disable
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\sa enableY()
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*/
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void QwtPlotGrid::enableYMin( bool on )
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{
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if ( m_data->yMinEnabled != on )
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{
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m_data->yMinEnabled = on;
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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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Assign an x axis scale division
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\param scaleDiv Scale division
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*/
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void QwtPlotGrid::setXDiv( const QwtScaleDiv& scaleDiv )
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{
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if ( m_data->xScaleDiv != scaleDiv )
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{
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m_data->xScaleDiv = scaleDiv;
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itemChanged();
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}
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}
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/*!
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Assign a y axis division
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\param scaleDiv Scale division
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*/
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void QwtPlotGrid::setYDiv( const QwtScaleDiv& scaleDiv )
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{
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if ( m_data->yScaleDiv != scaleDiv )
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{
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m_data->yScaleDiv = scaleDiv;
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itemChanged();
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}
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}
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/*!
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Build and assign a pen for both major and minor grid lines
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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 QwtPlotGrid::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 for both major and minor grid lines
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\param pen Pen
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\sa setMajorPen(), setMinorPen()
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*/
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void QwtPlotGrid::setPen( const QPen& pen )
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{
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if ( m_data->majorPen != pen || m_data->minorPen != pen )
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{
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m_data->majorPen = pen;
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m_data->minorPen = 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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Build and assign a pen for both major grid lines
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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 QwtPlotGrid::setMajorPen( const QColor& color, qreal width, Qt::PenStyle style )
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{
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setMajorPen( QPen( color, width, style ) );
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}
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/*!
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Assign a pen for the major grid lines
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\param pen Pen
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\sa majorPen(), setMinorPen(), setPen()
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*/
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void QwtPlotGrid::setMajorPen( const QPen& pen )
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{
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if ( m_data->majorPen != pen )
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{
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m_data->majorPen = 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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Build and assign a pen for the minor grid lines
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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 QwtPlotGrid::setMinorPen( const QColor& color, qreal width, Qt::PenStyle style )
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{
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setMinorPen( QPen( color, width, style ) );
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}
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/*!
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Assign a pen for the minor grid lines
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\param pen Pen
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\sa minorPen(), setMajorPen(), setPen()
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*/
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void QwtPlotGrid::setMinorPen( const QPen& pen )
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{
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if ( m_data->minorPen != pen )
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{
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m_data->minorPen = 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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\brief Draw the grid
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The grid is drawn into the bounding rectangle such that
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grid lines begin and end at the rectangle's borders. The X and Y
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maps are used to map the scale divisions into the drawing region
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screen.
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\param painter Painter
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\param xMap X axis map
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\param yMap Y axis
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\param canvasRect Contents rectangle of the plot canvas
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*/
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void QwtPlotGrid::draw( QPainter* painter,
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const QwtScaleMap& xMap, const QwtScaleMap& yMap,
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const QRectF& canvasRect ) const
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{
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// draw minor grid lines
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QPen minorPen = m_data->minorPen;
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minorPen.setCapStyle( Qt::FlatCap );
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painter->setPen( minorPen );
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if ( m_data->xEnabled && m_data->xMinEnabled )
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{
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drawLines( painter, canvasRect, Qt::Vertical, xMap,
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m_data->xScaleDiv.ticks( QwtScaleDiv::MinorTick ) );
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drawLines( painter, canvasRect, Qt::Vertical, xMap,
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m_data->xScaleDiv.ticks( QwtScaleDiv::MediumTick ) );
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}
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if ( m_data->yEnabled && m_data->yMinEnabled )
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{
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drawLines( painter, canvasRect, Qt::Horizontal, yMap,
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m_data->yScaleDiv.ticks( QwtScaleDiv::MinorTick ) );
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drawLines( painter, canvasRect, Qt::Horizontal, yMap,
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m_data->yScaleDiv.ticks( QwtScaleDiv::MediumTick ) );
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}
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// draw major grid lines
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QPen majorPen = m_data->majorPen;
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majorPen.setCapStyle( Qt::FlatCap );
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painter->setPen( majorPen );
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if ( m_data->xEnabled )
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{
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drawLines( painter, canvasRect, Qt::Vertical, xMap,
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m_data->xScaleDiv.ticks( QwtScaleDiv::MajorTick ) );
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}
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if ( m_data->yEnabled )
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{
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drawLines( painter, canvasRect, Qt::Horizontal, yMap,
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m_data->yScaleDiv.ticks( QwtScaleDiv::MajorTick ) );
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}
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}
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void QwtPlotGrid::drawLines( QPainter* painter, const QRectF& canvasRect,
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Qt::Orientation orientation, const QwtScaleMap& scaleMap,
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const QList< double >& values ) const
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{
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const double x1 = canvasRect.left();
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const double x2 = canvasRect.right() - 1.0;
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const double y1 = canvasRect.top();
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const double y2 = canvasRect.bottom() - 1.0;
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const bool doAlign = QwtPainter::roundingAlignment( painter );
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for ( int i = 0; i < values.count(); i++ )
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{
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double value = scaleMap.transform( values[i] );
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if ( doAlign )
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value = qRound( value );
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if ( orientation == Qt::Horizontal )
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{
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if ( qwtFuzzyGreaterOrEqual( value, y1 ) &&
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qwtFuzzyGreaterOrEqual( y2, value ) )
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{
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QwtPainter::drawLine( painter, x1, value, x2, value );
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}
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}
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else
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{
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if ( qwtFuzzyGreaterOrEqual( value, x1 ) &&
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qwtFuzzyGreaterOrEqual( x2, value ) )
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{
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QwtPainter::drawLine( painter, value, y1, value, y2 );
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}
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}
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}
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}
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/*!
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\return the pen for the major grid lines
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\sa setMajorPen(), setMinorPen(), setPen()
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*/
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const QPen& QwtPlotGrid::majorPen() const
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{
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return m_data->majorPen;
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}
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/*!
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\return the pen for the minor grid lines
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\sa setMinorPen(), setMajorPen(), setPen()
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*/
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const QPen& QwtPlotGrid::minorPen() const
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{
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return m_data->minorPen;
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}
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/*!
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\return true if vertical grid lines are enabled
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\sa enableX()
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*/
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bool QwtPlotGrid::xEnabled() const
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{
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return m_data->xEnabled;
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}
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/*!
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\return true if minor vertical grid lines are enabled
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\sa enableXMin()
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*/
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bool QwtPlotGrid::xMinEnabled() const
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{
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return m_data->xMinEnabled;
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}
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/*!
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\return true if horizontal grid lines are enabled
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\sa enableY()
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*/
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bool QwtPlotGrid::yEnabled() const
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{
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return m_data->yEnabled;
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}
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/*!
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\return true if minor horizontal grid lines are enabled
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\sa enableYMin()
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*/
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bool QwtPlotGrid::yMinEnabled() const
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{
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return m_data->yMinEnabled;
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}
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/*! \return the scale division of the x axis */
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const QwtScaleDiv& QwtPlotGrid::xScaleDiv() const
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{
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return m_data->xScaleDiv;
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}
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/*! \return the scale division of the y axis */
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const QwtScaleDiv& QwtPlotGrid::yScaleDiv() const
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{
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return m_data->yScaleDiv;
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}
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/*!
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Update the grid to changes of the axes scale division
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\param xScaleDiv Scale division of the x-axis
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\param yScaleDiv Scale division of the y-axis
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\sa QwtPlot::updateAxes()
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*/
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void QwtPlotGrid::updateScaleDiv( const QwtScaleDiv& xScaleDiv,
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const QwtScaleDiv& yScaleDiv )
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{
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setXDiv( xScaleDiv );
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setYDiv( yScaleDiv );
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}
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