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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382
|
/* -*- 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
*****************************************************************************/
#include "qwt_plot_picker.h"
#include "qwt_plot.h"
#include "qwt_scale_div.h"
#include "qwt_painter.h"
#include "qwt_scale_map.h"
#include "qwt_picker_machine.h"
/*!
\brief Create a plot picker
The picker is set to those x- and y-axis of the plot
that are enabled. If both or no x-axis are enabled, the picker
is set to QwtPlot::xBottom. If both or no y-axis are
enabled, it is set to QwtPlot::yLeft.
\param canvas Plot canvas to observe, also the parent object
\sa QwtPlot::autoReplot(), QwtPlot::replot(), scaleRect()
*/
QwtPlotPicker::QwtPlotPicker( QwtPlotCanvas *canvas ):
QwtPicker( canvas ),
d_xAxis( -1 ),
d_yAxis( -1 )
{
if ( !canvas )
return;
// attach axes
int xAxis = QwtPlot::xBottom;
const QwtPlot *plot = QwtPlotPicker::plot();
if ( !plot->axisEnabled( QwtPlot::xBottom ) &&
plot->axisEnabled( QwtPlot::xTop ) )
{
xAxis = QwtPlot::xTop;
}
int yAxis = QwtPlot::yLeft;
if ( !plot->axisEnabled( QwtPlot::yLeft ) &&
plot->axisEnabled( QwtPlot::yRight ) )
{
yAxis = QwtPlot::yRight;
}
setAxis( xAxis, yAxis );
}
/*!
Create a plot picker
\param xAxis Set the x axis of the picker
\param yAxis Set the y axis of the picker
\param canvas Plot canvas to observe, also the parent object
\sa QwtPlot::autoReplot(), QwtPlot::replot(), scaleRect()
*/
QwtPlotPicker::QwtPlotPicker( int xAxis, int yAxis, QwtPlotCanvas *canvas ):
QwtPicker( canvas ),
d_xAxis( xAxis ),
d_yAxis( yAxis )
{
}
/*!
Create a plot picker
\param xAxis X axis of the picker
\param yAxis Y axis of the picker
\param rubberBand Rubberband style
\param trackerMode Tracker mode
\param canvas Plot canvas to observe, also the parent object
\sa QwtPicker, QwtPicker::setSelectionFlags(), QwtPicker::setRubberBand(),
QwtPicker::setTrackerMode
\sa QwtPlot::autoReplot(), QwtPlot::replot(), scaleRect()
*/
QwtPlotPicker::QwtPlotPicker( int xAxis, int yAxis,
RubberBand rubberBand, DisplayMode trackerMode,
QwtPlotCanvas *canvas ):
QwtPicker( rubberBand, trackerMode, canvas ),
d_xAxis( xAxis ),
d_yAxis( yAxis )
{
}
//! Destructor
QwtPlotPicker::~QwtPlotPicker()
{
}
//! Return observed plot canvas
QwtPlotCanvas *QwtPlotPicker::canvas()
{
return qobject_cast<QwtPlotCanvas *>( parentWidget() );
}
//! Return Observed plot canvas
const QwtPlotCanvas *QwtPlotPicker::canvas() const
{
return qobject_cast<const QwtPlotCanvas *>( parentWidget() );
}
//! Return plot widget, containing the observed plot canvas
QwtPlot *QwtPlotPicker::plot()
{
QwtPlotCanvas *w = canvas();
if ( w )
return w->plot();
return NULL;
}
//! Return plot widget, containing the observed plot canvas
const QwtPlot *QwtPlotPicker::plot() const
{
const QwtPlotCanvas *w = canvas();
if ( w )
return w->plot();
return NULL;
}
/*!
Return normalized bounding rect of the axes
\sa QwtPlot::autoReplot(), QwtPlot::replot().
*/
QRectF QwtPlotPicker::scaleRect() const
{
QRectF rect;
if ( plot() )
{
const QwtScaleDiv *xs = plot()->axisScaleDiv( xAxis() );
const QwtScaleDiv *ys = plot()->axisScaleDiv( yAxis() );
if ( xs && ys )
{
rect = QRectF( xs->lowerBound(), ys->lowerBound(),
xs->range(), ys->range() );
rect = rect.normalized();
}
}
return rect;
}
/*!
Set the x and y axes of the picker
\param xAxis X axis
\param yAxis Y axis
*/
void QwtPlotPicker::setAxis( int xAxis, int yAxis )
{
const QwtPlot *plt = plot();
if ( !plt )
return;
if ( xAxis != d_xAxis || yAxis != d_yAxis )
{
d_xAxis = xAxis;
d_yAxis = yAxis;
}
}
//! Return x axis
int QwtPlotPicker::xAxis() const
{
return d_xAxis;
}
//! Return y axis
int QwtPlotPicker::yAxis() const
{
return d_yAxis;
}
/*!
Translate a pixel position into a position string
\param pos Position in pixel coordinates
\return Position string
*/
QwtText QwtPlotPicker::trackerText( const QPoint &pos ) const
{
return trackerTextF( invTransform( pos ) );
}
/*!
\brief Translate a position into a position string
In case of HLineRubberBand the label is the value of the
y position, in case of VLineRubberBand the value of the x position.
Otherwise the label contains x and y position separated by a ',' .
The format for the double to string conversion is "%.4f".
\param pos Position
\return Position string
*/
QwtText QwtPlotPicker::trackerTextF( const QPointF &pos ) const
{
QString text;
switch ( rubberBand() )
{
case HLineRubberBand:
text.sprintf( "%.4f", pos.y() );
break;
case VLineRubberBand:
text.sprintf( "%.4f", pos.x() );
break;
default:
text.sprintf( "%.4f, %.4f", pos.x(), pos.y() );
}
return QwtText( text );
}
/*!
Append a point to the selection and update rubberband and tracker.
\param pos Additional point
\sa isActive, begin(), end(), move(), appended()
\note The appended(const QPoint &), appended(const QDoublePoint &)
signals are emitted.
*/
void QwtPlotPicker::append( const QPoint &pos )
{
QwtPicker::append( pos );
Q_EMIT appended( invTransform( pos ) );
}
/*!
Move the last point of the selection
\param pos New position
\sa isActive, begin(), end(), append()
\note The moved(const QPoint &), moved(const QDoublePoint &)
signals are emitted.
*/
void QwtPlotPicker::move( const QPoint &pos )
{
QwtPicker::move( pos );
Q_EMIT moved( invTransform( pos ) );
}
/*!
Close a selection setting the state to inactive.
\param ok If true, complete the selection and emit selected signals
otherwise discard the selection.
\return true if the selection is accepted, false otherwise
*/
bool QwtPlotPicker::end( bool ok )
{
ok = QwtPicker::end( ok );
if ( !ok )
return false;
QwtPlot *plot = QwtPlotPicker::plot();
if ( !plot )
return false;
const QPolygon pa = selection();
if ( pa.count() == 0 )
return false;
QwtPickerMachine::SelectionType selectionType =
QwtPickerMachine::NoSelection;
if ( stateMachine() )
selectionType = stateMachine()->selectionType();
switch ( selectionType )
{
case QwtPickerMachine::PointSelection:
{
const QPointF pos = invTransform( pa[0] );
Q_EMIT selected( pos );
break;
}
case QwtPickerMachine::RectSelection:
{
if ( pa.count() >= 2 )
{
const QPoint p1 = pa[0];
const QPoint p2 = pa[int( pa.count() - 1 )];
const QRect rect = QRect( p1, p2 ).normalized();
Q_EMIT selected( invTransform( rect ) );
}
break;
}
case QwtPickerMachine::PolygonSelection:
{
QVector<QPointF> dpa( pa.count() );
for ( int i = 0; i < int( pa.count() ); i++ )
dpa[i] = invTransform( pa[i] );
Q_EMIT selected( dpa );
}
default:
break;
}
return true;
}
/*!
Translate a rectangle from pixel into plot coordinates
\return Rectangle in plot coordinates
\sa transform()
*/
QRectF QwtPlotPicker::invTransform( const QRect &rect ) const
{
const QwtScaleMap xMap = plot()->canvasMap( d_xAxis );
const QwtScaleMap yMap = plot()->canvasMap( d_yAxis );
return QwtScaleMap::invTransform( xMap, yMap, rect );
}
/*!
Translate a rectangle from plot into pixel coordinates
\return Rectangle in pixel coordinates
\sa invTransform()
*/
QRect QwtPlotPicker::transform( const QRectF &rect ) const
{
const QwtScaleMap xMap = plot()->canvasMap( d_xAxis );
const QwtScaleMap yMap = plot()->canvasMap( d_yAxis );
return QwtScaleMap::transform( xMap, yMap, rect ).toRect();
}
/*!
Translate a point from pixel into plot coordinates
\return Point in plot coordinates
\sa transform()
*/
QPointF QwtPlotPicker::invTransform( const QPoint &pos ) const
{
QwtScaleMap xMap = plot()->canvasMap( d_xAxis );
QwtScaleMap yMap = plot()->canvasMap( d_yAxis );
return QPointF(
xMap.invTransform( pos.x() ),
yMap.invTransform( pos.y() )
);
}
/*!
Translate a point from plot into pixel coordinates
\return Point in pixel coordinates
\sa invTransform()
*/
QPoint QwtPlotPicker::transform( const QPointF &pos ) const
{
QwtScaleMap xMap = plot()->canvasMap( d_xAxis );
QwtScaleMap yMap = plot()->canvasMap( d_yAxis );
const QPointF p( xMap.transform( pos.x() ),
yMap.transform( pos.y() ) );
return p.toPoint();
}
|