1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
* Qwt Widget Library
* Copyright (C) 1997 Josef Wilgen
* Copyright (C) 2002 Uwe Rathmann
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the Qwt License, Version 1.0
*****************************************************************************/
#ifndef QWT_PLOT_CANVAS_H
#define QWT_PLOT_CANVAS_H
#include "qwt_global.h"
#include <qframe.h>
#include <qpainterpath.h>
class QwtPlot;
class QPixmap;
/*!
\brief Canvas of a QwtPlot.
Canvas is the widget where all plot items are displayed
\sa QwtPlot::setCanvas(), QwtPlotGLCanvas
*/
class QWT_EXPORT QwtPlotCanvas : public QFrame
{
Q_OBJECT
Q_PROPERTY( double borderRadius READ borderRadius WRITE setBorderRadius )
public:
/*!
\brief Paint attributes
The default setting enables BackingStore and Opaque.
\sa setPaintAttribute(), testPaintAttribute()
*/
enum PaintAttribute
{
/*!
\brief Paint double buffered reusing the content
of the pixmap buffer when possible.
Using a backing store might improve the performance
significantly, when working with widget overlays ( like rubber bands ).
Disabling the cache might improve the performance for
incremental paints (using QwtPlotDirectPainter ).
\sa backingStore(), invalidateBackingStore()
*/
BackingStore = 1,
/*!
\brief Try to fill the complete contents rectangle
of the plot canvas
When using styled backgrounds Qt assumes, that the
canvas doesn't fill its area completely
( f.e because of rounded borders ) and fills the area
below the canvas. When this is done with gradients it might
result in a serious performance bottleneck - depending on the size.
When the Opaque attribute is enabled the canvas tries to
identify the gaps with some heuristics and to fill those only.
\warning Will not work for semitransparent backgrounds
*/
Opaque = 2,
/*!
\brief Try to improve painting of styled backgrounds
QwtPlotCanvas supports the box model attributes for
customizing the layout with style sheets. Unfortunately
the design of Qt style sheets has no concept how to
handle backgrounds with rounded corners - beside of padding.
When HackStyledBackground is enabled the plot canvas tries
to separate the background from the background border
by reverse engineering to paint the background before and
the border after the plot items. In this order the border
gets perfectly antialiased and you can avoid some pixel
artifacts in the corners.
*/
HackStyledBackground = 4,
/*!
When ImmediatePaint is set replot() calls repaint()
instead of update().
\sa replot(), QWidget::repaint(), QWidget::update()
*/
ImmediatePaint = 8
};
//! Paint attributes
typedef QFlags<PaintAttribute> PaintAttributes;
/*!
\brief Focus indicator
The default setting is NoFocusIndicator
\sa setFocusIndicator(), focusIndicator(), paintFocus()
*/
enum FocusIndicator
{
//! Don't paint a focus indicator
NoFocusIndicator,
/*!
The focus is related to the complete canvas.
Paint the focus indicator using paintFocus()
*/
CanvasFocusIndicator,
/*!
The focus is related to an item (curve, point, ...) on
the canvas. It is up to the application to display a
focus indication using f.e. highlighting.
*/
ItemFocusIndicator
};
explicit QwtPlotCanvas( QwtPlot * = NULL );
virtual ~QwtPlotCanvas();
QwtPlot *plot();
const QwtPlot *plot() const;
void setFocusIndicator( FocusIndicator );
FocusIndicator focusIndicator() const;
void setBorderRadius( double );
double borderRadius() const;
void setPaintAttribute( PaintAttribute, bool on = true );
bool testPaintAttribute( PaintAttribute ) const;
const QPixmap *backingStore() const;
void invalidateBackingStore();
virtual bool event( QEvent * );
Q_INVOKABLE QPainterPath borderPath( const QRect & ) const;
public Q_SLOTS:
void replot();
protected:
virtual void paintEvent( QPaintEvent * );
virtual void resizeEvent( QResizeEvent * );
virtual void drawFocusIndicator( QPainter * );
virtual void drawBorder( QPainter * );
void updateStyleSheetInfo();
private:
void drawCanvas( QPainter *, bool withBackground );
class PrivateData;
PrivateData *d_data;
};
Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPlotCanvas::PaintAttributes )
#endif