76 lines
1.8 KiB
C
76 lines
1.8 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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#ifndef QWT_PLOT_TEXT_LABEL_H
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#define QWT_PLOT_TEXT_LABEL_H 1
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#include "qwt_global.h"
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#include "qwt_plot_item.h"
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#include "qwt_text.h"
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/*!
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\brief A plot item, which displays a text label
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QwtPlotTextLabel displays a text label aligned to the plot canvas.
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In opposite to QwtPlotMarker the position of the label is unrelated to
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plot coordinates.
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As drawing a text is an expensive operation the label is cached
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in a pixmap to speed up replots.
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\par Example
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The following code shows how to add a title.
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\code
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QwtText title( "Plot Title" );
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title.setRenderFlags( Qt::AlignHCenter | Qt::AlignTop );
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QFont font;
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font.setBold( true );
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title.setFont( font );
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QwtPlotTextLabel *titleItem = new QwtPlotTextLabel();
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titleItem->setText( title );
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titleItem->attach( plot );
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\endcode
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\endpar
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\sa QwtPlotMarker
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*/
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class QWT_EXPORT QwtPlotTextLabel: public QwtPlotItem
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{
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public:
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QwtPlotTextLabel();
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virtual ~QwtPlotTextLabel();
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virtual int rtti() const;
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void setText( const QwtText & );
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QwtText text() const;
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void setMargin( int margin );
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int margin() const;
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virtual QRectF textRect( const QRectF &, const QSizeF & ) const;
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protected:
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virtual void draw( QPainter *,
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const QwtScaleMap &, const QwtScaleMap &,
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const QRectF &) const;
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void invalidateCache();
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private:
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class PrivateData;
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PrivateData *d_data;
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};
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#endif
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