彻底改版2.0
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feiyangqingyun
315
third/3rd_qwt/qwt_plot_zoneitem.cpp
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315
third/3rd_qwt/qwt_plot_zoneitem.cpp
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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_zoneitem.h"
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#include "qwt_painter.h"
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#include "qwt_scale_map.h"
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#include <qpainter.h>
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class QwtPlotZoneItem::PrivateData
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{
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public:
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PrivateData():
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orientation( Qt::Vertical ),
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pen( Qt::NoPen )
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{
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QColor c( Qt::darkGray );
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c.setAlpha( 100 );
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brush = QBrush( c );
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}
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Qt::Orientation orientation;
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QPen pen;
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QBrush brush;
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QwtInterval interval;
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};
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/*!
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\brief Constructor
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Initializes the zone with no pen and a semi transparent gray brush
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Sets the following item attributes:
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- QwtPlotItem::AutoScale: false
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- QwtPlotItem::Legend: false
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The z value is initialized by 5
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\sa QwtPlotItem::setItemAttribute(), QwtPlotItem::setZ()
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*/
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QwtPlotZoneItem::QwtPlotZoneItem():
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QwtPlotItem( QwtText( "Zone" ) )
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{
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d_data = new PrivateData;
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setItemAttribute( QwtPlotItem::AutoScale, false );
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setItemAttribute( QwtPlotItem::Legend, false );
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setZ( 5 );
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}
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//! Destructor
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QwtPlotZoneItem::~QwtPlotZoneItem()
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{
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delete d_data;
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}
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//! \return QwtPlotItem::Rtti_PlotZone
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int QwtPlotZoneItem::rtti() const
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{
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return QwtPlotItem::Rtti_PlotZone;
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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 QwtPlotZoneItem::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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\brief Assign a pen
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The pen is used to draw the border lines of the zone
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\param pen Pen
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\sa pen(), setBrush()
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*/
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void QwtPlotZoneItem::setPen( const QPen &pen )
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{
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if ( d_data->pen != pen )
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{
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d_data->pen = pen;
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itemChanged();
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}
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}
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/*!
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\return Pen used to draw the border lines
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\sa setPen(), brush()
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*/
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const QPen &QwtPlotZoneItem::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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\brief Assign a brush
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The brush is used to fill the zone
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\param brush Brush
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\sa pen(), setBrush()
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*/
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void QwtPlotZoneItem::setBrush( const QBrush &brush )
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{
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if ( d_data->brush != brush )
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{
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d_data->brush = brush;
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itemChanged();
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}
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}
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/*!
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\return Brush used to fill the zone
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\sa setPen(), brush()
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*/
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const QBrush &QwtPlotZoneItem::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 Set the orientation of the zone
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A horizontal zone highlights an interval of the y axis,
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a vertical zone of the x axis. It is unbounded in the
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opposite direction.
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\sa orientation(), QwtPlotItem::setAxes()
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*/
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void QwtPlotZoneItem::setOrientation( Qt::Orientation orientation )
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{
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if ( d_data->orientation != orientation )
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{
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d_data->orientation = orientation;
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itemChanged();
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}
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}
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/*!
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\return Orientation of the zone
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\sa setOrientation()
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*/
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Qt::Orientation QwtPlotZoneItem::orientation()
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{
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return d_data->orientation;
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}
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/*!
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Set the interval of the zone
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For a horizontal zone the interval is related to the y axis,
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for a vertical zone it is related to the x axis.
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\param min Minimum of the interval
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\param max Maximum of the interval
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\sa interval(), setOrientation()
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*/
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void QwtPlotZoneItem::setInterval( double min, double max )
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{
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setInterval( QwtInterval( min, max ) );
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}
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/*!
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Set the interval of the zone
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For a horizontal zone the interval is related to the y axis,
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for a vertical zone it is related to the x axis.
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\param interval Zone interval
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\sa interval(), setOrientation()
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*/
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void QwtPlotZoneItem::setInterval( const QwtInterval &interval )
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{
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if ( d_data->interval != interval )
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{
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d_data->interval = interval;
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itemChanged();
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}
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}
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/*!
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\return Zone interval
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\sa setInterval(), orientation()
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*/
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QwtInterval QwtPlotZoneItem::interval() const
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{
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return d_data->interval;
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}
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/*!
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Draw the zone
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\param painter Painter
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\param xMap x Scale Map
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\param yMap y Scale Map
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\param canvasRect Contents rectangle of the canvas in painter coordinates
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*/
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void QwtPlotZoneItem::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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if ( !d_data->interval.isValid() )
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return;
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QPen pen = d_data->pen;
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pen.setCapStyle( Qt::FlatCap );
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const bool doAlign = QwtPainter::roundingAlignment( painter );
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if ( d_data->orientation == Qt::Horizontal )
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{
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double y1 = yMap.transform( d_data->interval.minValue() );
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double y2 = yMap.transform( d_data->interval.maxValue() );
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if ( doAlign )
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{
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y1 = qRound( y1 );
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y2 = qRound( y2 );
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}
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QRectF r( canvasRect.left(), y1, canvasRect.width(), y2 - y1 );
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r = r.normalized();
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if ( ( d_data->brush.style() != Qt::NoBrush ) && ( y1 != y2 ) )
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{
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QwtPainter::fillRect( painter, r, d_data->brush );
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}
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if ( d_data->pen.style() != Qt::NoPen )
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{
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painter->setPen( d_data->pen );
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QwtPainter::drawLine( painter, r.left(), r.top(), r.right(), r.top() );
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QwtPainter::drawLine( painter, r.left(), r.bottom(), r.right(), r.bottom() );
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}
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}
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else
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{
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double x1 = xMap.transform( d_data->interval.minValue() );
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double x2 = xMap.transform( d_data->interval.maxValue() );
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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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}
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QRectF r( x1, canvasRect.top(), x2 - x1, canvasRect.height() );
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r = r.normalized();
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if ( ( d_data->brush.style() != Qt::NoBrush ) && ( x1 != x2 ) )
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{
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QwtPainter::fillRect( painter, r, d_data->brush );
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}
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if ( d_data->pen.style() != Qt::NoPen )
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{
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painter->setPen( d_data->pen );
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QwtPainter::drawLine( painter, r.left(), r.top(), r.left(), r.bottom() );
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QwtPainter::drawLine( painter, r.right(), r.top(), r.right(), r.bottom() );
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}
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}
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}
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/*!
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The bounding rectangle is build from the interval in one direction
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and something invalid for the opposite direction.
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\return An invalid rectangle with valid boundaries in one direction
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*/
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QRectF QwtPlotZoneItem::boundingRect() const
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{
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QRectF br = QwtPlotItem::boundingRect();
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const QwtInterval &intv = d_data->interval;
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if ( intv.isValid() )
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{
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if ( d_data->orientation == Qt::Horizontal )
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{
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br.setTop( intv.minValue() );
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br.setBottom( intv.maxValue() );
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}
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else
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{
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br.setLeft( intv.minValue() );
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br.setRight( intv.maxValue() );
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}
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}
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return br;
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}
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