彻底改版2.0
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feiyangqingyun
272
third/3rd_qwt/qwt_plot_textlabel.cpp
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272
third/3rd_qwt/qwt_plot_textlabel.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_textlabel.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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#include <qpixmap.h>
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#include <qmath.h>
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static QRect qwtItemRect( int renderFlags,
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const QRectF &rect, const QSizeF &itemSize )
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{
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int x;
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if ( renderFlags & Qt::AlignLeft )
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{
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x = rect.left();
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}
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else if ( renderFlags & Qt::AlignRight )
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{
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x = rect.right() - itemSize.width();
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}
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else
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{
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x = rect.center().x() - 0.5 * itemSize.width();
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}
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int y;
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if ( renderFlags & Qt::AlignTop )
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{
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y = rect.top();
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}
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else if ( renderFlags & Qt::AlignBottom )
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{
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y = rect.bottom() - itemSize.height();
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}
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else
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{
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y = rect.center().y() - 0.5 * itemSize.height();
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}
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return QRect( x, y, itemSize.width(), itemSize.height() );
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}
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class QwtPlotTextLabel::PrivateData
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{
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public:
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PrivateData():
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margin( 5 )
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{
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}
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QwtText text;
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int margin;
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QPixmap pixmap;
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};
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/*!
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\brief Constructor
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Initializes an text label with an empty text
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Sets the following item attributes:
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- QwtPlotItem::AutoScale: true
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- QwtPlotItem::Legend: false
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The z value is initialized by 150
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\sa QwtPlotItem::setItemAttribute(), QwtPlotItem::setZ()
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*/
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QwtPlotTextLabel::QwtPlotTextLabel():
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QwtPlotItem( QwtText( "Label" ) )
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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( 150 );
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}
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//! Destructor
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QwtPlotTextLabel::~QwtPlotTextLabel()
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{
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delete d_data;
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}
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//! \return QwtPlotItem::Rtti_PlotTextLabel
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int QwtPlotTextLabel::rtti() const
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{
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return QwtPlotItem::Rtti_PlotTextLabel;
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}
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/*!
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Set the text
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The label will be aligned to the plot canvas according to
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the alignment flags of text.
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\param text Text to be displayed
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\sa text(), QwtText::renderFlags()
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*/
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void QwtPlotTextLabel::setText( const QwtText &text )
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{
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if ( d_data->text != text )
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{
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d_data->text = text;
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invalidateCache();
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itemChanged();
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}
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}
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/*!
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\return Text to be displayed
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\sa setText()
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*/
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QwtText QwtPlotTextLabel::text() const
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{
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return d_data->text;
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}
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/*!
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Set the margin
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The margin is the distance between the contentsRect()
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of the plot canvas and the rectangle where the label can
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be displayed.
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\param margin Margin
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\sa margin(), textRect()
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*/
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void QwtPlotTextLabel::setMargin( int margin )
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{
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margin = qMax( margin, 0 );
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if ( d_data->margin != margin )
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{
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d_data->margin = margin;
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itemChanged();
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}
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}
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/*!
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\return Margin added to the contentsMargins() of the canvas
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\sa setMargin()
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*/
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int QwtPlotTextLabel::margin() const
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{
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return d_data->margin;
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}
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/*!
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Draw the text label
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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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\sa textRect()
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*/
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void QwtPlotTextLabel::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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Q_UNUSED( xMap );
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Q_UNUSED( yMap );
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const int m = d_data->margin;
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const QRectF rect = textRect( canvasRect.adjusted( m, m, -m, -m ),
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d_data->text.textSize( painter->font() ) );
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bool doCache = QwtPainter::roundingAlignment( painter );
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if ( doCache )
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{
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switch( painter->paintEngine()->type() )
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{
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case QPaintEngine::Picture:
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case QPaintEngine::User: // usually QwtGraphic
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{
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// don't use a cache for record/replay devices
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doCache = false;
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break;
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}
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default:;
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}
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}
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if ( doCache )
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{
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// when the paint device is aligning it is not one
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// where scalability matters ( PDF, SVG ).
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// As rendering a text label is an expensive operation
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// we use a cache.
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int pw = 0;
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if ( d_data->text.borderPen().style() != Qt::NoPen )
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pw = qMax( d_data->text.borderPen().width(), 1 );
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QRect pixmapRect;
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pixmapRect.setLeft( qFloor( rect.left() ) - pw );
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pixmapRect.setTop( qFloor( rect.top() ) - pw );
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pixmapRect.setRight( qCeil( rect.right() ) + pw );
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pixmapRect.setBottom( qCeil( rect.bottom() ) + pw );
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#define QWT_HIGH_DPI 1
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#if QT_VERSION >= 0x050100 && QWT_HIGH_DPI
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const qreal pixelRatio = painter->device()->devicePixelRatio();
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const QSize scaledSize = pixmapRect.size() * pixelRatio;
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#else
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const QSize scaledSize = pixmapRect.size();
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#endif
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if ( d_data->pixmap.isNull() ||
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( scaledSize != d_data->pixmap.size() ) )
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{
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d_data->pixmap = QPixmap( scaledSize );
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#if QT_VERSION >= 0x050100 && QWT_HIGH_DPI
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d_data->pixmap.setDevicePixelRatio( pixelRatio );
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#endif
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d_data->pixmap.fill( Qt::transparent );
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const QRect r( pw, pw,
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pixmapRect.width() - 2 * pw, pixmapRect.height() - 2 * pw );
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QPainter pmPainter( &d_data->pixmap );
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d_data->text.draw( &pmPainter, r );
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}
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painter->drawPixmap( pixmapRect, d_data->pixmap );
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}
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else
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{
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d_data->text.draw( painter, rect );
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}
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}
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/*!
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\brief Align the text label
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\param rect Canvas rectangle with margins subtracted
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\param textSize Size required to draw the text
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\return A rectangle aligned according the the alignment flags of
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the text.
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\sa setMargin(), QwtText::renderFlags(), QwtText::textSize()
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*/
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QRectF QwtPlotTextLabel::textRect(
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const QRectF &rect, const QSizeF &textSize ) const
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{
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return qwtItemRect( d_data->text.renderFlags(), rect, textSize );
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}
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//! Invalidate all internal cache
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void QwtPlotTextLabel::invalidateCache()
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{
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d_data->pixmap = QPixmap();
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}
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