Qwt User's Guide: qwt_plot_panner.cpp Source File

Qwt User's Guide 6.2.0

qwt_plot_panner.cpp
1 /******************************************************************************
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 #include "qwt_plot_panner.h"
11 #include "qwt_scale_div.h"
12 #include "qwt_plot.h"
13 #include "qwt_scale_map.h"
14 #include "qwt_painter.h"
15
16 #include <qbitmap.h>
17 #include <qstyle.h>
18 #include <qstyleoption.h>
19 #include <qpainter.h>
20 #include <qpainterpath.h>
21
22 static QBitmap qwtBorderMask( const QWidget* canvas, const QSize& size )
23 {
24 #if QT_VERSION >= 0x050000
25 const qreal pixelRatio = QwtPainter::devicePixelRatio( canvas );
26 #endif
27
28 const QRect r( 0, 0, size.width(), size.height() );
29
30 QPainterPath borderPath;
31
32 ( void )QMetaObject::invokeMethod(
33 const_cast< QWidget* >( canvas ), "borderPath", Qt::DirectConnection,
34 Q_RETURN_ARG( QPainterPath, borderPath ), Q_ARG( QRect, r ) );
35
36 if ( borderPath.isEmpty() )
37 {
38 if ( canvas->contentsRect() == canvas->rect() )
39 return QBitmap();
40
41 #if QT_VERSION >= 0x050000
42 QBitmap mask( size* pixelRatio );
43 mask.setDevicePixelRatio( pixelRatio );
44 #else
45 QBitmap mask( size );
46 #endif
47 mask.fill( Qt::color0 );
48
49 QPainter painter( &mask );
50 painter.fillRect( canvas->contentsRect(), Qt::color1 );
51
52 return mask;
53 }
54
55 #if QT_VERSION >= 0x050000
56 QImage image( size* pixelRatio, QImage::Format_ARGB32_Premultiplied );
57 image.setDevicePixelRatio( pixelRatio );
58 #else
59 QImage image( size, QImage::Format_ARGB32_Premultiplied );
60 #endif
61 image.fill( Qt::color0 );
62
63 QPainter painter( &image );
64 painter.setClipPath( borderPath );
65 painter.fillRect( r, Qt::color1 );
66
67 // now erase the frame
68
69 painter.setCompositionMode( QPainter::CompositionMode_DestinationOut );
70
71 if ( canvas->testAttribute(Qt::WA_StyledBackground ) )
72 {
73 QStyleOptionFrame opt;
74 opt.initFrom(canvas);
75 opt.rect = r;
76 canvas->style()->drawPrimitive( QStyle::PE_Frame, &opt, &painter, canvas );
77 }
78 else
79 {
80 const QVariant borderRadius = canvas->property( "borderRadius" );
81 const QVariant frameWidth = canvas->property( "frameWidth" );
82
83 if ( borderRadius.canConvert< double >() && frameWidth.canConvert< int >() )
84 {
85 const double br = borderRadius.value< double >();
86 const int fw = frameWidth.value< int >();
87
88 if ( br > 0.0 && fw > 0 )
89 {
90 painter.setPen( QPen( Qt::color1, fw ) );
91 painter.setBrush( Qt::NoBrush );
92 painter.setRenderHint( QPainter::Antialiasing, true );
93
94 painter.drawPath( borderPath );
95 }
96 }
97 }
98
99 painter.end();
100
101 const QImage mask = image.createMaskFromColor(
102 QColor( Qt::color1 ).rgb(), Qt::MaskOutColor );
103
104 return QBitmap::fromImage( mask );
105 }
106
107 class QwtPlotPanner::PrivateData
108 {
109 public:
110 PrivateData()
111 {
112 for ( int axis = 0; axis < QwtAxis::AxisPositions; axis++ )
113 isAxisEnabled[axis] = true;
114 }
115
116 bool isAxisEnabled[QwtAxis::AxisPositions];
117 };
118
128 QwtPlotPanner::QwtPlotPanner( QWidget* canvas )
129 : QwtPanner( canvas )
130 {
131 m_data = new PrivateData();
132
133 connect( this, SIGNAL(panned(int,int)),
134 SLOT(moveCanvas(int,int)) );
135 }
136
138 QwtPlotPanner::~QwtPlotPanner()
139 {
140 delete m_data;
141 }
142
154 void QwtPlotPanner::setAxisEnabled( QwtAxisId axisId, bool on )
155 {
156 if ( QwtAxis::isValid( axisId ) )
157 m_data->isAxisEnabled[axisId] = on;
158 }
159
168 bool QwtPlotPanner::isAxisEnabled( QwtAxisId axisId ) const
169 {
170 if ( QwtAxis::isValid( axisId ) )
171 return m_data->isAxisEnabled[axisId];
172
173 return true;
174 }
175
177 QWidget* QwtPlotPanner::canvas()
178 {
179 return parentWidget();
180 }
181
183 const QWidget* QwtPlotPanner::canvas() const
184 {
185 return parentWidget();
186 }
187
189 QwtPlot* QwtPlotPanner::plot()
190 {
191 QWidget* w = canvas();
192 if ( w )
193 w = w->parentWidget();
194
195 return qobject_cast< QwtPlot* >( w );
196 }
197
199 const QwtPlot* QwtPlotPanner::plot() const
200 {
201 const QWidget* w = canvas();
202 if ( w )
203 w = w->parentWidget();
204
205 return qobject_cast< const QwtPlot* >( w );
206 }
207
216 void QwtPlotPanner::moveCanvas( int dx, int dy )
217 {
218 if ( dx == 0 && dy == 0 )
219 return;
220
221 QwtPlot* plot = this->plot();
222 if ( plot == NULL )
223 return;
224
225 const bool doAutoReplot = plot->autoReplot();
226 plot->setAutoReplot( false );
227
228 for ( int axisPos = 0; axisPos < QwtAxis::AxisPositions; axisPos++ )
229 {
230 {
231 const QwtAxisId axisId( axisPos );
232
233 if ( !m_data->isAxisEnabled[axisId] )
234 continue;
235
236 const QwtScaleMap map = plot->canvasMap( axisId );
237
238 const double p1 = map.transform( plot->axisScaleDiv( axisId ).lowerBound() );
239 const double p2 = map.transform( plot->axisScaleDiv( axisId ).upperBound() );
240
241 double d1, d2;
242 if ( QwtAxis::isXAxis( axisPos ) )
243 {
244 d1 = map.invTransform( p1 - dx );
245 d2 = map.invTransform( p2 - dx );
246 }
247 else
248 {
249 d1 = map.invTransform( p1 - dy );
250 d2 = map.invTransform( p2 - dy );
251 }
252
253 plot->setAxisScale( axisId, d1, d2 );
254 }
255 }
256
257 plot->setAutoReplot( doAutoReplot );
258 plot->replot();
259 }
260
267 QBitmap QwtPlotPanner::contentsMask() const
268 {
269 if ( canvas() )
270 return qwtBorderMask( canvas(), size() );
271
272 return QwtPanner::contentsMask();
273 }
274
278 QPixmap QwtPlotPanner::grab() const
279 {
280 const QWidget* cv = canvas();
281 if ( cv && cv->inherits( "QGLWidget" ) )
282 {
283 // we can't grab from a QGLWidget
284
285 QPixmap pm( cv->size() );
286 QwtPainter::fillPixmap( cv, pm );
287
288 QPainter painter( &pm );
289 const_cast< QwtPlot* >( plot() )->drawCanvas( &painter );
290
291 return pm;
292 }
293
294 return QwtPanner::grab();
295 }
296
297 #if QWT_MOC_INCLUDE
298 #include "moc_qwt_plot_panner.cpp"
299 #endif
QwtPainter::fillPixmap
static void fillPixmap(const QWidget *, QPixmap &, const QPoint &offset=QPoint())
Definition: qwt_painter.cpp:1311
QwtPainter::devicePixelRatio
static qreal devicePixelRatio(const QPaintDevice *)
Definition: qwt_painter.cpp:1491
QwtPanner
QwtPanner provides panning of a widget.
Definition: qwt_panner.h:36
QwtPanner::contentsMask
virtual QBitmap contentsMask() const
Calculate a mask for the contents of the panned widget.
Definition: qwt_panner.cpp:297
QwtPanner::grab
virtual QPixmap grab() const
Definition: qwt_panner.cpp:306
QwtPanner::panned
void panned(int dx, int dy)
QwtPlot
A 2-D plotting widget.
Definition: qwt_plot.h:79
QwtPlot::setAxisScale
void setAxisScale(QwtAxisId, double min, double max, double stepSize=0)
Disable autoscaling and specify a fixed scale for a selected axis.
Definition: qwt_plot_axis.cpp:473
QwtPlot::autoReplot
bool autoReplot() const
Definition: qwt_plot.cpp:319
QwtPlot::replot
virtual void replot()
Redraw the plot.
Definition: qwt_plot.cpp:545
QwtPlot::setAutoReplot
void setAutoReplot(bool=true)
Set or reset the autoReplot option.
Definition: qwt_plot.cpp:310
QwtPlot::canvasMap
virtual QwtScaleMap canvasMap(QwtAxisId) const
Definition: qwt_plot.cpp:800
QwtPlot::axisScaleDiv
const QwtScaleDiv & axisScaleDiv(QwtAxisId) const
Return the scale division of a specified axis.
Definition: qwt_plot_axis.cpp:283
QwtPlotPanner::canvas
QWidget * canvas()
Return observed plot canvas.
Definition: qwt_plot_panner.cpp:177
QwtPlotPanner::contentsMask
virtual QBitmap contentsMask() const override
Definition: qwt_plot_panner.cpp:267
QwtPlotPanner::QwtPlotPanner
QwtPlotPanner(QWidget *)
A panner for the canvas of a QwtPlot.
Definition: qwt_plot_panner.cpp:128
QwtPlotPanner::setAxisEnabled
void setAxisEnabled(QwtAxisId axisId, bool on)
En/Disable an axis.
Definition: qwt_plot_panner.cpp:154
QwtPlotPanner::~QwtPlotPanner
virtual ~QwtPlotPanner()
Destructor.
Definition: qwt_plot_panner.cpp:138
QwtPlotPanner::moveCanvas
virtual void moveCanvas(int dx, int dy)
Definition: qwt_plot_panner.cpp:216
QwtPlotPanner::isAxisEnabled
bool isAxisEnabled(QwtAxisId) const
Definition: qwt_plot_panner.cpp:168
QwtPlotPanner::plot
QwtPlot * plot()
Return plot widget, containing the observed plot canvas.
Definition: qwt_plot_panner.cpp:189
QwtPlotPanner::grab
virtual QPixmap grab() const override
Definition: qwt_plot_panner.cpp:278
QwtScaleDiv::lowerBound
double lowerBound() const
Definition: qwt_scale_div.cpp:131
QwtScaleDiv::upperBound
double upperBound() const
Definition: qwt_scale_div.cpp:151
QwtScaleMap
A scale map.
Definition: qwt_scale_map.h:27
QwtScaleMap::transform
double transform(double s) const
Definition: qwt_scale_map.h:137
QwtScaleMap::invTransform
double invTransform(double p) const
Definition: qwt_scale_map.h:154
QwtAxis::isValid
bool isValid(int axisPos)
Definition: qwt_axis.h:45
QwtAxis::isXAxis
bool isXAxis(int axisPos)
Definition: qwt_axis.h:51