-
-
Notifications
You must be signed in to change notification settings - Fork 3k
/
qgssnappingutils.cpp
574 lines (483 loc) · 19.1 KB
/
qgssnappingutils.cpp
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
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
/***************************************************************************
qgssnappingutils.cpp
--------------------------------------
Date : November 2014
Copyright : (C) 2014 by Martin Dobias
Email : wonder dot sk at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "qgssnappingutils.h"
#include "qgsgeometry.h"
#include "qgsproject.h"
#include "qgsvectorlayer.h"
#include "qgslogger.h"
QgsSnappingUtils::QgsSnappingUtils( QObject *parent )
: QObject( parent )
, mSnappingConfig( QgsProject::instance() )
{
}
QgsSnappingUtils::~QgsSnappingUtils()
{
clearAllLocators();
}
QgsPointLocator *QgsSnappingUtils::locatorForLayer( QgsVectorLayer *vl )
{
if ( !vl )
return nullptr;
if ( !mLocators.contains( vl ) )
{
QgsPointLocator *vlpl = new QgsPointLocator( vl, destinationCrs(), mMapSettings.transformContext() );
mLocators.insert( vl, vlpl );
}
return mLocators.value( vl );
}
void QgsSnappingUtils::clearAllLocators()
{
qDeleteAll( mLocators );
mLocators.clear();
qDeleteAll( mTemporaryLocators );
mTemporaryLocators.clear();
}
QgsPointLocator *QgsSnappingUtils::locatorForLayerUsingStrategy( QgsVectorLayer *vl, const QgsPointXY &pointMap, double tolerance )
{
QgsRectangle aoi( pointMap.x() - tolerance, pointMap.y() - tolerance,
pointMap.x() + tolerance, pointMap.y() + tolerance );
if ( isIndexPrepared( vl, aoi ) )
return locatorForLayer( vl );
else
return temporaryLocatorForLayer( vl, pointMap, tolerance );
}
QgsPointLocator *QgsSnappingUtils::temporaryLocatorForLayer( QgsVectorLayer *vl, const QgsPointXY &pointMap, double tolerance )
{
if ( mTemporaryLocators.contains( vl ) )
delete mTemporaryLocators.take( vl );
QgsRectangle rect( pointMap.x() - tolerance, pointMap.y() - tolerance,
pointMap.x() + tolerance, pointMap.y() + tolerance );
QgsPointLocator *vlpl = new QgsPointLocator( vl, destinationCrs(), mMapSettings.transformContext(), &rect );
mTemporaryLocators.insert( vl, vlpl );
return mTemporaryLocators.value( vl );
}
bool QgsSnappingUtils::isIndexPrepared( QgsVectorLayer *vl, const QgsRectangle &areaOfInterest )
{
if ( vl->geometryType() == QgsWkbTypes::NullGeometry || mStrategy == IndexNeverFull )
return false;
QgsPointLocator *loc = locatorForLayer( vl );
if ( mStrategy == IndexAlwaysFull && loc->hasIndex() )
return true;
QgsRectangle aoi( areaOfInterest );
aoi.scale( 0.999 );
return ( mStrategy == IndexHybrid || mStrategy == IndexExtent ) && loc->hasIndex() && ( !loc->extent() || loc->extent()->contains( aoi ) ); // the index - even if it exists - is not suitable
}
static QgsPointLocator::Match _findClosestSegmentIntersection( const QgsPointXY &pt, const QgsPointLocator::MatchList &segments )
{
if ( segments.isEmpty() )
return QgsPointLocator::Match();
QSet<QgsPointXY> endpoints;
// make a geometry
QVector<QgsGeometry> geoms;
Q_FOREACH ( const QgsPointLocator::Match &m, segments )
{
if ( m.hasEdge() )
{
QgsPolylineXY pl( 2 );
m.edgePoints( pl[0], pl[1] );
geoms << QgsGeometry::fromPolylineXY( pl );
endpoints << pl[0] << pl[1];
}
}
QgsGeometry g = QgsGeometry::unaryUnion( geoms );
// get intersection points
QList<QgsPointXY> newPoints;
if ( g.wkbType() == QgsWkbTypes::LineString )
{
Q_FOREACH ( const QgsPointXY &p, g.asPolyline() )
{
if ( !endpoints.contains( p ) )
newPoints << p;
}
}
if ( g.wkbType() == QgsWkbTypes::MultiLineString )
{
Q_FOREACH ( const QgsPolylineXY &pl, g.asMultiPolyline() )
{
Q_FOREACH ( const QgsPointXY &p, pl )
{
if ( !endpoints.contains( p ) )
newPoints << p;
}
}
}
if ( newPoints.isEmpty() )
return QgsPointLocator::Match();
// find the closest points
QgsPointXY minP;
double minSqrDist = 1e20; // "infinity"
Q_FOREACH ( const QgsPointXY &p, newPoints )
{
double sqrDist = pt.sqrDist( p.x(), p.y() );
if ( sqrDist < minSqrDist )
{
minSqrDist = sqrDist;
minP = p;
}
}
return QgsPointLocator::Match( QgsPointLocator::Vertex, nullptr, 0, std::sqrt( minSqrDist ), minP );
}
static void _replaceIfBetter( QgsPointLocator::Match &bestMatch, const QgsPointLocator::Match &candidateMatch, double maxDistance )
{
// is candidate match relevant?
if ( !candidateMatch.isValid() || candidateMatch.distance() > maxDistance )
return;
// is candidate match actually better?
if ( bestMatch.isValid() && bestMatch.type() == candidateMatch.type() && bestMatch.distance() - 10e-6 < candidateMatch.distance() )
return;
// prefer vertex matches over edge matches (even if they are closer)
if ( bestMatch.type() == QgsPointLocator::Vertex && candidateMatch.type() == QgsPointLocator::Edge )
return;
bestMatch = candidateMatch; // the other match is better!
}
static void _updateBestMatch( QgsPointLocator::Match &bestMatch, const QgsPointXY &pointMap, QgsPointLocator *loc, QgsPointLocator::Types type, double tolerance, QgsPointLocator::MatchFilter *filter )
{
if ( type & QgsPointLocator::Vertex )
{
_replaceIfBetter( bestMatch, loc->nearestVertex( pointMap, tolerance, filter ), tolerance );
}
if ( bestMatch.type() != QgsPointLocator::Vertex && ( type & QgsPointLocator::Edge ) )
{
_replaceIfBetter( bestMatch, loc->nearestEdge( pointMap, tolerance, filter ), tolerance );
}
}
static QgsPointLocator::Types _snappingTypeToPointLocatorType( QgsSnappingConfig::SnappingType type )
{
// watch out: vertex+segment vs segment are in different order in the two enums
switch ( type )
{
case QgsSnappingConfig::Vertex:
return QgsPointLocator::Vertex;
case QgsSnappingConfig::VertexAndSegment:
return QgsPointLocator::Types( QgsPointLocator::Vertex | QgsPointLocator::Edge );
case QgsSnappingConfig::Segment:
return QgsPointLocator::Edge;
default:
return QgsPointLocator::Invalid;
}
}
QgsPointLocator::Match QgsSnappingUtils::snapToMap( QPoint point, QgsPointLocator::MatchFilter *filter )
{
return snapToMap( mMapSettings.mapToPixel().toMapCoordinates( point ), filter );
}
inline QgsRectangle _areaOfInterest( const QgsPointXY &point, double tolerance )
{
return QgsRectangle( point.x() - tolerance, point.y() - tolerance,
point.x() + tolerance, point.y() + tolerance );
}
QgsPointLocator::Match QgsSnappingUtils::snapToMap( const QgsPointXY &pointMap, QgsPointLocator::MatchFilter *filter )
{
if ( !mMapSettings.hasValidSettings() || !mSnappingConfig.enabled() )
{
return QgsPointLocator::Match();
}
if ( mSnappingConfig.mode() == QgsSnappingConfig::ActiveLayer )
{
if ( !mCurrentLayer || mSnappingConfig.type() == 0 )
return QgsPointLocator::Match();
// data from project
double tolerance = QgsTolerance::toleranceInProjectUnits( mSnappingConfig.tolerance(), mCurrentLayer, mMapSettings, mSnappingConfig.units() );
QgsPointLocator::Types type = _snappingTypeToPointLocatorType( mSnappingConfig.type() );
prepareIndex( QList<LayerAndAreaOfInterest>() << qMakePair( mCurrentLayer, _areaOfInterest( pointMap, tolerance ) ) );
// use ad-hoc locator
QgsPointLocator *loc = locatorForLayerUsingStrategy( mCurrentLayer, pointMap, tolerance );
if ( !loc )
return QgsPointLocator::Match();
QgsPointLocator::Match bestMatch;
_updateBestMatch( bestMatch, pointMap, loc, type, tolerance, filter );
if ( mSnappingConfig.intersectionSnapping() )
{
QgsPointLocator *locEdges = locatorForLayerUsingStrategy( mCurrentLayer, pointMap, tolerance );
QgsPointLocator::MatchList edges = locEdges->edgesInRect( pointMap, tolerance );
_replaceIfBetter( bestMatch, _findClosestSegmentIntersection( pointMap, edges ), tolerance );
}
return bestMatch;
}
else if ( mSnappingConfig.mode() == QgsSnappingConfig::AdvancedConfiguration )
{
QList<LayerAndAreaOfInterest> layers;
Q_FOREACH ( const LayerConfig &layerConfig, mLayers )
{
double tolerance = QgsTolerance::toleranceInProjectUnits( layerConfig.tolerance, layerConfig.layer, mMapSettings, layerConfig.unit );
layers << qMakePair( layerConfig.layer, _areaOfInterest( pointMap, tolerance ) );
}
prepareIndex( layers );
QgsPointLocator::Match bestMatch;
QgsPointLocator::MatchList edges; // for snap on intersection
double maxSnapIntTolerance = 0;
Q_FOREACH ( const LayerConfig &layerConfig, mLayers )
{
double tolerance = QgsTolerance::toleranceInProjectUnits( layerConfig.tolerance, layerConfig.layer, mMapSettings, layerConfig.unit );
if ( QgsPointLocator *loc = locatorForLayerUsingStrategy( layerConfig.layer, pointMap, tolerance ) )
{
_updateBestMatch( bestMatch, pointMap, loc, layerConfig.type, tolerance, filter );
if ( mSnappingConfig.intersectionSnapping() )
{
edges << loc->edgesInRect( pointMap, tolerance );
maxSnapIntTolerance = std::max( maxSnapIntTolerance, tolerance );
}
}
}
if ( mSnappingConfig.intersectionSnapping() )
_replaceIfBetter( bestMatch, _findClosestSegmentIntersection( pointMap, edges ), maxSnapIntTolerance );
return bestMatch;
}
else if ( mSnappingConfig.mode() == QgsSnappingConfig::AllLayers )
{
// data from project
double tolerance = QgsTolerance::toleranceInProjectUnits( mSnappingConfig.tolerance(), nullptr, mMapSettings, mSnappingConfig.units() );
QgsPointLocator::Types type = _snappingTypeToPointLocatorType( mSnappingConfig.type() );
QgsRectangle aoi = _areaOfInterest( pointMap, tolerance );
QList<LayerAndAreaOfInterest> layers;
Q_FOREACH ( QgsMapLayer *layer, mMapSettings.layers() )
if ( QgsVectorLayer *vl = qobject_cast<QgsVectorLayer *>( layer ) )
layers << qMakePair( vl, aoi );
prepareIndex( layers );
QgsPointLocator::MatchList edges; // for snap on intersection
QgsPointLocator::Match bestMatch;
Q_FOREACH ( const LayerAndAreaOfInterest &entry, layers )
{
QgsVectorLayer *vl = entry.first;
if ( QgsPointLocator *loc = locatorForLayerUsingStrategy( vl, pointMap, tolerance ) )
{
_updateBestMatch( bestMatch, pointMap, loc, type, tolerance, filter );
if ( mSnappingConfig.intersectionSnapping() )
edges << loc->edgesInRect( pointMap, tolerance );
}
}
if ( mSnappingConfig.intersectionSnapping() )
_replaceIfBetter( bestMatch, _findClosestSegmentIntersection( pointMap, edges ), tolerance );
return bestMatch;
}
return QgsPointLocator::Match();
}
void QgsSnappingUtils::prepareIndex( const QList<LayerAndAreaOfInterest> &layers )
{
if ( mIsIndexing )
return;
mIsIndexing = true;
// check if we need to build any index
QList<LayerAndAreaOfInterest> layersToIndex;
Q_FOREACH ( const LayerAndAreaOfInterest &entry, layers )
{
QgsVectorLayer *vl = entry.first;
if ( vl->geometryType() == QgsWkbTypes::NullGeometry || mStrategy == IndexNeverFull )
continue;
if ( !isIndexPrepared( vl, entry.second ) )
layersToIndex << entry;
}
if ( !layersToIndex.isEmpty() )
{
// build indexes
QTime t;
t.start();
int i = 0;
prepareIndexStarting( layersToIndex.count() );
Q_FOREACH ( const LayerAndAreaOfInterest &entry, layersToIndex )
{
QgsVectorLayer *vl = entry.first;
QTime tt;
tt.start();
QgsPointLocator *loc = locatorForLayer( vl );
if ( mStrategy == IndexExtent )
{
QgsRectangle rect( mMapSettings.extent() );
loc->setExtent( &rect );
loc->init();
}
else if ( mStrategy == IndexHybrid )
{
// first time the layer is used? - let's set an initial guess about indexing
if ( !mHybridMaxAreaPerLayer.contains( vl->id() ) )
{
int totalFeatureCount = vl->featureCount();
if ( totalFeatureCount < mHybridPerLayerFeatureLimit )
{
// index the whole layer
mHybridMaxAreaPerLayer[vl->id()] = -1;
}
else
{
// estimate for how big area it probably makes sense to build partial index to not exceed the limit
// (we may change the limit later)
QgsRectangle layerExtent = mMapSettings.layerExtentToOutputExtent( vl, vl->extent() );
double totalArea = layerExtent.width() * layerExtent.height();
mHybridMaxAreaPerLayer[vl->id()] = totalArea * mHybridPerLayerFeatureLimit / totalFeatureCount / 4;
}
}
double indexReasonableArea = mHybridMaxAreaPerLayer[vl->id()];
if ( indexReasonableArea == -1 )
{
// we can safely index the whole layer
loc->init();
}
else
{
// use area as big as we think may fit into our limit
QgsPointXY c = entry.second.center();
double halfSide = std::sqrt( indexReasonableArea ) / 2;
QgsRectangle rect( c.x() - halfSide, c.y() - halfSide,
c.x() + halfSide, c.y() + halfSide );
loc->setExtent( &rect );
// see if it's possible build index for this area
if ( !loc->init( mHybridPerLayerFeatureLimit ) )
{
// hmm that didn't work out - too many features!
// let's make the allowed area smaller for the next time
mHybridMaxAreaPerLayer[vl->id()] /= 4;
}
}
}
else // full index strategy
loc->init();
QgsDebugMsg( QString( "Index init: %1 ms (%2)" ).arg( tt.elapsed() ).arg( vl->id() ) );
prepareIndexProgress( ++i );
}
QgsDebugMsg( QString( "Prepare index total: %1 ms" ).arg( t.elapsed() ) );
}
mIsIndexing = false;
}
QgsSnappingConfig QgsSnappingUtils::config() const
{
return mSnappingConfig;
}
void QgsSnappingUtils::setConfig( const QgsSnappingConfig &config )
{
if ( mSnappingConfig == config )
return;
if ( mSnappingConfig.individualLayerSettings() != config.individualLayerSettings() )
onIndividualLayerSettingsChanged( config.individualLayerSettings() );
mSnappingConfig = config;
emit configChanged( mSnappingConfig );
}
void QgsSnappingUtils::toggleEnabled()
{
mSnappingConfig.setEnabled( !mSnappingConfig.enabled() );
emit configChanged( mSnappingConfig );
}
QgsPointLocator::Match QgsSnappingUtils::snapToCurrentLayer( QPoint point, QgsPointLocator::Types type, QgsPointLocator::MatchFilter *filter )
{
if ( !mCurrentLayer )
return QgsPointLocator::Match();
QgsPointXY pointMap = mMapSettings.mapToPixel().toMapCoordinates( point );
double tolerance = QgsTolerance::vertexSearchRadius( mMapSettings );
QgsPointLocator *loc = locatorForLayerUsingStrategy( mCurrentLayer, pointMap, tolerance );
if ( !loc )
return QgsPointLocator::Match();
QgsPointLocator::Match bestMatch;
_updateBestMatch( bestMatch, pointMap, loc, type, tolerance, filter );
return bestMatch;
}
void QgsSnappingUtils::setMapSettings( const QgsMapSettings &settings )
{
QString oldDestCRS = mMapSettings.destinationCrs().authid();
QString newDestCRS = settings.destinationCrs().authid();
mMapSettings = settings;
if ( newDestCRS != oldDestCRS )
clearAllLocators();
}
void QgsSnappingUtils::setCurrentLayer( QgsVectorLayer *layer )
{
mCurrentLayer = layer;
}
QString QgsSnappingUtils::dump()
{
QString msg = QStringLiteral( "--- SNAPPING UTILS DUMP ---\n" );
if ( !mMapSettings.hasValidSettings() )
{
msg += QLatin1String( "invalid map settings!" );
return msg;
}
QList<LayerConfig> layers;
if ( mSnappingConfig.mode() == QgsSnappingConfig::ActiveLayer )
{
if ( mSnappingConfig.mode() == QgsSnappingConfig::ActiveLayer && !mCurrentLayer )
{
msg += QLatin1String( "no current layer!" );
return msg;
}
layers << LayerConfig( mCurrentLayer, _snappingTypeToPointLocatorType( mSnappingConfig.type() ), mSnappingConfig.tolerance(), mSnappingConfig.units() );
}
else if ( mSnappingConfig.mode() == QgsSnappingConfig::AllLayers )
{
Q_FOREACH ( QgsMapLayer *layer, mMapSettings.layers() )
{
if ( QgsVectorLayer *vl = qobject_cast<QgsVectorLayer *>( layer ) )
layers << LayerConfig( vl, _snappingTypeToPointLocatorType( mSnappingConfig.type() ), mSnappingConfig.tolerance(), mSnappingConfig.units() );
}
}
else if ( mSnappingConfig.mode() == QgsSnappingConfig::AdvancedConfiguration )
{
layers = mLayers;
}
Q_FOREACH ( const LayerConfig &layer, layers )
{
msg += QString( "layer : %1\n"
"config: %2 tolerance %3 %4\n" )
.arg( layer.layer->name() )
.arg( layer.type ).arg( layer.tolerance ).arg( layer.unit );
if ( mStrategy == IndexAlwaysFull || mStrategy == IndexHybrid || mStrategy == IndexExtent )
{
if ( QgsPointLocator *loc = locatorForLayer( layer.layer ) )
{
QString extentStr, cachedGeoms, limit( QStringLiteral( "no max area" ) );
if ( const QgsRectangle *r = loc->extent() )
{
extentStr = QStringLiteral( " extent %1" ).arg( r->toString() );
}
else
extentStr = QStringLiteral( "full extent" );
if ( loc->hasIndex() )
cachedGeoms = QStringLiteral( "%1 feats" ).arg( loc->cachedGeometryCount() );
else
cachedGeoms = QStringLiteral( "not initialized" );
if ( mStrategy == IndexHybrid )
{
if ( mHybridMaxAreaPerLayer.contains( layer.layer->id() ) )
{
double maxArea = mStrategy == IndexHybrid ? mHybridMaxAreaPerLayer[layer.layer->id()] : -1;
if ( maxArea != -1 )
limit = QStringLiteral( "max area %1" ).arg( maxArea );
}
else
limit = QStringLiteral( "not evaluated" );
}
msg += QStringLiteral( "index : YES | %1 | %2 | %3\n" ).arg( cachedGeoms, extentStr, limit );
}
else
msg += QStringLiteral( "index : ???\n" ); // should not happen
}
else
msg += QLatin1String( "index : NO\n" );
msg += QLatin1String( "-\n" );
}
return msg;
}
QgsCoordinateReferenceSystem QgsSnappingUtils::destinationCrs() const
{
return mMapSettings.destinationCrs();
}
void QgsSnappingUtils::onIndividualLayerSettingsChanged( const QHash<QgsVectorLayer *, QgsSnappingConfig::IndividualLayerSettings> &layerSettings )
{
mLayers.clear();
QHash<QgsVectorLayer *, QgsSnappingConfig::IndividualLayerSettings>::const_iterator i;
for ( i = layerSettings.constBegin(); i != layerSettings.constEnd(); ++i )
{
if ( i->enabled() )
{
mLayers.append( LayerConfig( i.key(), _snappingTypeToPointLocatorType( i->type() ), i->tolerance(), i->units() ) );
}
}
}