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101 lines
3.1 KiB
C++
101 lines
3.1 KiB
C++
/* -*- 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_DIRECT_PAINTER_H
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#define QWT_PLOT_DIRECT_PAINTER_H
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#include "qwt_global.h"
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#include <qobject.h>
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class QRegion;
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class QwtPlotSeriesItem;
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/*!
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\brief Painter object trying to paint incrementally
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Often applications want to display samples while they are
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collected. When there are too many samples complete replots
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will be expensive to be processed in a collection cycle.
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QwtPlotDirectPainter offers an API to paint
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subsets ( f.e all additions points ) without erasing/repainting
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the plot canvas.
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On certain environments it might be important to calculate a proper
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clip region before painting. F.e. for Qt Embedded only the clipped part
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of the backing store will be copied to a ( maybe unaccelerated )
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frame buffer.
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\warning Incremental painting will only help when no replot is triggered
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by another operation ( like changing scales ) and nothing needs
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to be erased.
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*/
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class QWT_EXPORT QwtPlotDirectPainter: public QObject
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{
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public:
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/*!
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\brief Paint attributes
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\sa setAttribute(), testAttribute(), drawSeries()
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*/
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enum Attribute
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{
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/*!
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Initializing a QPainter is an expensive operation.
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When AtomicPainter is set each call of drawSeries() opens/closes
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a temporary QPainter. Otherwise QwtPlotDirectPainter tries to
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use the same QPainter as long as possible.
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*/
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AtomicPainter = 0x01,
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/*!
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When FullRepaint is set the plot canvas is explicitly repainted
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after the samples have been rendered.
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*/
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FullRepaint = 0x02,
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/*!
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When QwtPlotCanvas::BackingStore is enabled the painter
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has to paint to the backing store and the widget. In certain
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situations/environments it might be faster to paint to
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the backing store only and then copy the backing store to the canvas.
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This flag can also be useful for settings, where Qt fills the
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the clip region with the widget background.
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*/
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CopyBackingStore = 0x04
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};
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//! Paint attributes
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typedef QFlags<Attribute> Attributes;
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QwtPlotDirectPainter( QObject *parent = NULL );
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virtual ~QwtPlotDirectPainter();
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void setAttribute( Attribute, bool on );
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bool testAttribute( Attribute ) const;
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void setClipping( bool );
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bool hasClipping() const;
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void setClipRegion( const QRegion & );
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QRegion clipRegion() const;
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void drawSeries( QwtPlotSeriesItem *, int from, int to );
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void reset();
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virtual bool eventFilter( QObject *, QEvent * );
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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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Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPlotDirectPainter::Attributes )
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#endif
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