source: ntrip/branches/BNC_2.12/qwt/qwt_plot_directpainter.h@ 9402

Last change on this file since 9402 was 4271, checked in by mervart, 12 years ago
File size: 3.1 KB
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1/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
2 * Qwt Widget Library
3 * Copyright (C) 1997 Josef Wilgen
4 * Copyright (C) 2002 Uwe Rathmann
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the Qwt License, Version 1.0
8 *****************************************************************************/
9
10#ifndef QWT_PLOT_DIRECT_PAINTER_H
11#define QWT_PLOT_DIRECT_PAINTER_H
12
13#include "qwt_global.h"
14#include <qobject.h>
15
16class QRegion;
17class QwtPlotAbstractSeriesItem;
18
19/*!
20 \brief Painter object trying to paint incrementally
21
22 Often applications want to display samples while they are
23 collected. When there are too many samples complete replots
24 will be expensive to be processed in a collection cycle.
25
26 QwtPlotDirectPainter offers an API to paint
27 subsets ( f.e all additions points ) without erasing/repainting
28 the plot canvas.
29
30 On certain environments it might be important to calculate a proper
31 clip region before painting. F.e. for Qt Embedded only the clipped part
32 of the backing store will be copied to a ( maybe unaccelerated )
33 frame buffer.
34
35 \warning Incremental painting will only help when no replot is triggered
36 by another operation ( like changing scales ) and nothing needs
37 to be erased.
38*/
39class QWT_EXPORT QwtPlotDirectPainter: public QObject
40{
41public:
42 /*!
43 \brief Paint attributes
44 \sa setAttribute(), testAttribute(), drawSeries()
45 */
46 enum Attribute
47 {
48 /*!
49 Initializing a QPainter is an expensive operation.
50 When AtomicPainter is set each call of drawSeries() opens/closes
51 a temporary QPainter. Otherwise QwtPlotDirectPainter tries to
52 use the same QPainter as long as possible.
53 */
54 AtomicPainter = 0x01,
55
56 /*!
57 When FullRepaint is set the plot canvas is explicitely repainted
58 after the samples have been rendered.
59 */
60 FullRepaint = 0x02,
61
62 /*!
63 When QwtPlotCanvas::BackingStore is enabled the painter
64 has to paint to the backing store and the widget. In certain
65 situations/environments it might be faster to paint to
66 the backing store only and then copy the backingstore to the canvas.
67 This flag can also be useful for settings, where Qt fills the
68 the clip region with the widget background.
69 */
70 CopyBackingStore = 0x04
71 };
72
73 //! Paint attributes
74 typedef QFlags<Attribute> Attributes;
75
76 QwtPlotDirectPainter( QObject *parent = NULL );
77 virtual ~QwtPlotDirectPainter();
78
79 void setAttribute( Attribute, bool on );
80 bool testAttribute( Attribute ) const;
81
82 void setClipping( bool );
83 bool hasClipping() const;
84
85 void setClipRegion( const QRegion & );
86 QRegion clipRegion() const;
87
88 void drawSeries( QwtPlotAbstractSeriesItem *, int from, int to );
89 void reset();
90
91 virtual bool eventFilter( QObject *, QEvent * );
92
93private:
94 class PrivateData;
95 PrivateData *d_data;
96};
97
98Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPlotDirectPainter::Attributes )
99
100#endif
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