QGIS API Documentation  3.14.0-Pi (9f7028fd23)
NormVecDecorator.cpp
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1 /***************************************************************************
2  NormVecDecorator.cpp
3  --------------------
4  copyright : (C) 2004 by Marco Hugentobler
5  email : [email protected]
6  ***************************************************************************/
7 
8 /***************************************************************************
9  * *
10  * This program is free software; you can redistribute it and/or modify *
11  * it under the terms of the GNU General Public License as published by *
12  * the Free Software Foundation; either version 2 of the License, or *
13  * (at your option) any later version. *
14  * *
15  ***************************************************************************/
16 
17 #include <QApplication>
18 
19 #include "qgsfeedback.h"
20 #include "qgslogger.h"
21 #include "qgsfields.h"
22 #include "qgspoint.h"
23 
24 #include "NormVecDecorator.h"
25 
26 
28 {
29  //remove all the normals
30  if ( !mNormVec->isEmpty() )
31  {
32  for ( int i = 0; i < mNormVec->count(); i++ )
33  {
34  delete ( *mNormVec )[i];
35  }
36  }
37 
38  delete mNormVec;
39  delete mPointState;
40  delete mTIN;
41 }
42 
44 {
45  if ( mTIN )
46  {
47  int pointno;
48  pointno = mTIN->addPoint( p );
49 
50  if ( pointno == -100 )//a numerical error occurred
51  {
52 // QgsDebugMsg("warning, numerical error");
53  return -100;
54  }
55 
56  //recalculate the necessary normals
57  if ( alreadyestimated )
58  {
59  estimateFirstDerivative( pointno );
60  //update also the neighbours of the new point
61  const QList<int> list = mTIN->getSurroundingTriangles( pointno );
62  auto it = list.constBegin();//iterate through the list and analyze it
63  while ( it != list.constEnd() )
64  {
65  int point;
66  point = *it;
67  if ( point != -1 )
68  {
69  estimateFirstDerivative( point );
70  }
71  ++it;
72  ++it;
73  ++it;
74  ++it;
75  }
76  }
77  return pointno;
78  }
79 
80  return -1;
81 }
82 
83 bool NormVecDecorator::calcNormal( double x, double y, Vector3D *result )
84 {
85  if ( !alreadyestimated )
86  {
88  alreadyestimated = true;
89  }
90 
91  if ( mInterpolator )
92  {
93  bool b = mInterpolator->calcNormVec( x, y, result );
94  return b;
95  }
96  else
97  {
98  QgsDebugMsg( QStringLiteral( "warning, null pointer" ) );
99  return false;
100  }
101 }
102 
103 bool NormVecDecorator::calcNormalForPoint( double x, double y, int point, Vector3D *result )
104 {
105  if ( !alreadyestimated )
106  {
108  alreadyestimated = true;
109  }
110 
111  if ( result )
112  {
113  int numberofbreaks = 0;//number of breaklines around the point
114  int ffirstbp = -1000; //numbers of the points related to the first breakline
115  int lfirstbp = -1000;
116  bool pointfound = false;//is set to true, if the triangle with the point in is found
117  int numberofruns = 0;//number of runs of the loop. This integer can be used to prevent endless loops
118  int limit = 100000;//ater this number of iterations, the method is terminated
119 
120  result->setX( 0 );
121  result->setY( 0 );
122  result->setZ( 0 );
123 
124  const QList<int> vlist = getSurroundingTriangles( point );//get the value list
125  if ( vlist.empty() )//an error occurred in 'getSurroundingTriangles'
126  {
127  return false;
128  }
129 
130  if ( ( ( vlist.count() ) % 4 ) != 0 ) //number of items in vlist has to be a multiple of 4
131  {
132  QgsDebugMsg( QStringLiteral( "warning, wrong number of items in vlist" ) );
133  return false;
134  }
135 
136  auto it = vlist.constBegin();
137 
138  bool firstrun;
139 
140  while ( true )//endless loop to analyze vlist
141  {
142  numberofruns++;
143  if ( numberofruns > limit )
144  {
145  QgsDebugMsg( QStringLiteral( "warning, a probable endless loop is detected" ) );
146  return false;
147  }
148 
149  int p1, p2, p3, line;
150  firstrun = false;//flag which tells, if it is the first run with a breakline
151  p1 = ( *it );
152  ++it;
153  p2 = ( *it );
154  ++it;
155  p3 = ( *it );
156  ++it;
157  line = ( *it );
158 
159 
160  if ( numberofbreaks > 0 )
161  {
162 
163  if ( p1 != -1 && p2 != -1 && p3 != -1 )
164  {
165  if ( MathUtils::pointInsideTriangle( x, y, getPoint( p1 ), getPoint( p2 ), getPoint( p3 ) ) )
166  {
167  pointfound = true;
168  }
169 
170  Vector3D addvec( 0, 0, 0 );
171  MathUtils::normalFromPoints( getPoint( p1 ), getPoint( p2 ), getPoint( p3 ), &addvec );
172  result->setX( result->getX() + addvec.getX() );
173  result->setY( result->getY() + addvec.getY() );
174  result->setZ( result->getZ() + addvec.getZ() );
175  }
176  }
177 
178  if ( line == -10 )//we found a breakline
179  {
180 
181  if ( numberofbreaks == 0 )//it is the first breakline
182  {
183  firstrun = true;
184  ffirstbp = p2;//set the marks to recognize the breakline later
185  lfirstbp = p3;
186  }
187 
188  if ( p2 == ffirstbp && p3 == lfirstbp && !firstrun )//we are back at the first breakline
189  {
190  if ( !pointfound )//the point with coordinates x, y was in no triangle
191  {
192  QgsDebugMsg( QStringLiteral( "warning: point (x,y) was in no triangle" ) );
193  return false;
194  }
195  result->standardise();
196  break;
197  }
198 
199  if ( numberofbreaks > 0 && pointfound )//we found the second break line and the point is between the first and the second
200  {
201  result->standardise();
202  numberofbreaks++;//to make the distinction between endpoints and points on a breakline easier
203  break;
204  }
205 
206  result->setX( 0 );
207  result->setY( 0 );
208  result->setZ( 0 );
209  numberofbreaks++;
210  }
211 
212  ++it;
213  if ( it == vlist.constEnd() )//restart at the beginning of the loop
214  {
215  it = vlist.constBegin();
216  }
217  }
218  return true;
219  }
220  else
221  {
222  QgsDebugMsg( QStringLiteral( "warning, null pointer" ) );
223  return false;
224  }
225 
226 }
227 
228 bool NormVecDecorator::calcPoint( double x, double y, QgsPoint &result )
229 {
230 
231  if ( !alreadyestimated )
232  {
234  alreadyestimated = true;
235  }
236 
237  if ( mInterpolator )
238  {
239  bool b = mInterpolator->calcPoint( x, y, result );
240  return b;
241  }
242  else
243  {
244  QgsDebugMsg( QStringLiteral( "warning, null pointer" ) );
245  return false;
246  }
247 }
248 
249 bool NormVecDecorator::getTriangle( double x, double y, QgsPoint &p1, Vector3D *v1, QgsPoint &p2, Vector3D *v2, QgsPoint &p3, Vector3D *v3 )
250 {
251  if ( v1 && v2 && v3 )
252  {
253  int nr1 = 0;
254  int nr2 = 0;
255  int nr3 = 0;
256 
257  if ( TriDecorator::getTriangle( x, y, p1, nr1, p2, nr2, p3, nr3 ) )//everything alright
258  {
259  if ( ( *mNormVec )[ nr1 ] && ( *mNormVec )[ nr2 ] && ( *mNormVec )[ nr3 ] )
260  {
261  v1->setX( ( *mNormVec )[ nr1 ]->getX() );
262  v1->setY( ( *mNormVec )[nr1 ]->getY() );
263  v1->setZ( ( *mNormVec )[nr1 ]->getZ() );
264 
265  v2->setX( ( *mNormVec )[nr2 ]->getX() );
266  v2->setY( ( *mNormVec )[nr2 ]->getY() );
267  v2->setZ( ( *mNormVec )[nr2 ]->getZ() );
268 
269  v3->setX( ( *mNormVec )[nr3 ]->getX() );
270  v3->setY( ( *mNormVec )[nr3 ]->getY() );
271  v3->setZ( ( *mNormVec )[nr3 ]->getZ() );
272  }
273  else
274  {
275  QgsDebugMsg( QStringLiteral( "warning, null pointer" ) );
276  return false;
277  }
278  return true;
279  }
280  else
281  {
282  return false;
283  }
284  }
285 
286  else
287  {
288  QgsDebugMsg( QStringLiteral( "warning, null pointer" ) );
289  return false;
290  }
291 }
292 
294 {
295  if ( pointno >= 0 )
296  {
297  return mPointState->at( pointno );
298  }
299  else
300  {
301  QgsDebugMsg( QStringLiteral( "warning, number below 0" ) );
302  return mPointState->at( 0 );//just to avoid a compiler warning
303  }
304 }
305 
306 
307 bool NormVecDecorator::getTriangle( double x, double y, QgsPoint &p1, int &ptn1, Vector3D *v1, PointState *state1, QgsPoint &p2, int &ptn2, Vector3D *v2, PointState *state2, QgsPoint &p3, int &ptn3, Vector3D *v3, PointState *state3 )
308 {
309  if ( v1 && v2 && v3 && state1 && state2 && state3 )
310  {
311  if ( TriDecorator::getTriangle( x, y, p1, ptn1, p2, ptn2, p3, ptn3 ) )//everything alright
312  {
313  v1->setX( ( *mNormVec )[( ptn1 )]->getX() );
314  v1->setY( ( *mNormVec )[( ptn1 )]->getY() );
315  v1->setZ( ( *mNormVec )[( ptn1 )]->getZ() );
316 
317  ( *state1 ) = ( *mPointState )[( ptn1 )];
318 
319  v2->setX( ( *mNormVec )[( ptn2 )]->getX() );
320  v2->setY( ( *mNormVec )[( ptn2 )]->getY() );
321  v2->setZ( ( *mNormVec )[( ptn2 )]->getZ() );
322 
323  ( *state2 ) = ( *mPointState )[( ptn2 )];
324 
325  v3->setX( ( *mNormVec )[( ptn3 )]->getX() );
326  v3->setY( ( *mNormVec )[( ptn3 )]->getY() );
327  v3->setZ( ( *mNormVec )[( ptn3 )]->getZ() );
328 
329  ( *state3 ) = ( *mPointState )[( ptn3 )];
330 
331  return true;
332  }
333  else
334  {
335  return false;
336  }
337 
338  }
339  else
340  {
341  QgsDebugMsg( QStringLiteral( "warning, null pointer" ) );
342  return false;
343  }
344 }
345 
347 {
348  if ( pointno == -1 )
349  {
350  return false;
351  }
352 
353  Vector3D part;
354  Vector3D total;
355  total.setX( 0 );
356  total.setY( 0 );
357  total.setZ( 0 );
358  int numberofbreaks = 0;//number of counted breaklines
359  double weights = 0;//sum of the weights
360  double currentweight = 0;//current weight
361  PointState status;
362 
363  const QList<int> vlist = getSurroundingTriangles( pointno );//get the value list
364 
365  if ( vlist.empty() )
366  {
367  //something went wrong in getSurroundingTriangles, set the normal to (0,0,0)
368  if ( mNormVec->size() <= mNormVec->count() )//allocate more memory if necessary
369  {
370  QgsDebugMsg( QStringLiteral( "resizing mNormVec from %1 to %2" ).arg( mNormVec->size() ).arg( mNormVec->size() + 1 ) );
371  mNormVec->resize( mNormVec->size() + 1 );
372  }
373 
374  //todo:resize mNormVec if necessary
375 
376  if ( !( ( *mNormVec )[pointno] ) ) //insert a pointer to a Vector3D, if there is none at this position
377  {
378  Vector3D *vec = new Vector3D( total.getX(), total.getY(), total.getZ() );
379  mNormVec->insert( pointno, vec );
380  }
381  else
382  {
383  ( *mNormVec )[pointno]->setX( 0 );
384  ( *mNormVec )[pointno]->setY( 0 );
385  ( *mNormVec )[pointno]->setZ( 0 );
386  }
387  return false;
388  }
389 
390  if ( ( vlist.count() % 4 ) != 0 ) //number of items in vlist has to be a multiple of 4
391  {
392  QgsDebugMsg( QStringLiteral( "warning, wrong number of items in vlist" ) );
393  return false;
394  }
395 
396  auto it = vlist.constBegin();//iterate through the list and analyze it
397  while ( it != vlist.constEnd() )
398  {
399  int p1, p2, p3, flag;
400  part.setX( 0 );
401  part.setY( 0 );
402  part.setZ( 0 );
403 
404  currentweight = 0;
405 
406  p1 = ( *it );
407  ++it;
408  p2 = ( *it );
409  ++it;
410  p3 = ( *it );
411  ++it;
412  flag = ( *it );
413 
414  if ( flag == -10 )//we found a breakline.
415  {
416  numberofbreaks++;
417  }
418 
419  if ( p1 != -1 && p2 != -1 && p3 != -1 )//don't calculate normal, if a point is a virtual point
420  {
421  MathUtils::normalFromPoints( getPoint( p1 ), getPoint( p2 ), getPoint( p3 ), &part );
422  double dist1 = getPoint( p3 )->distance3D( *getPoint( p1 ) );
423  double dist2 = getPoint( p3 )->distance3D( *getPoint( p2 ) );
424  //don't add the normal if the triangle is horizontal
425  if ( ( getPoint( p1 )->z() != getPoint( p2 )->z() ) || ( getPoint( p1 )->z() != getPoint( p3 )->z() ) )
426  {
427  currentweight = 1 / ( dist1 * dist1 * dist2 * dist2 );
428  total.setX( total.getX() + part.getX()*currentweight );
429  total.setY( total.getY() + part.getY()*currentweight );
430  total.setZ( total.getZ() + part.getZ()*currentweight );
431  weights += currentweight;
432  }
433  }
434  ++it;
435  }
436 
437  if ( total.getX() == 0 && total.getY() == 0 && total.getZ() == 0 )//we have a point surrounded by horizontal triangles
438  {
439  total.setZ( 1 );
440  }
441  else
442  {
443  total.setX( total.getX() / weights );
444  total.setY( total.getY() / weights );
445  total.setZ( total.getZ() / weights );
446  total.standardise();
447  }
448 
449 
450  if ( numberofbreaks == 0 )
451  {
452  status = Normal;
453  }
454  else if ( numberofbreaks == 1 )
455  {
456  status = EndPoint;
457  }
458  else
459  {
460  status = BreakLine;
461  }
462 
463  //insert the new calculated vector
464  if ( mNormVec->size() <= mNormVec->count() )//allocate more memory if necessary
465  {
466  mNormVec->resize( mNormVec->size() + 1 );
467  }
468 
469  if ( !( ( *mNormVec )[pointno] ) ) //insert a pointer to a Vector3D, if there is none at this position
470  {
471  Vector3D *vec = new Vector3D( total.getX(), total.getY(), total.getZ() );
472  mNormVec->insert( pointno, vec );
473  }
474  else
475  {
476  ( *mNormVec )[pointno]->setX( total.getX() );
477  ( *mNormVec )[pointno]->setY( total.getY() );
478  ( *mNormVec )[pointno]->setZ( total.getZ() );
479  }
480 
481  //insert the new status
482 
483  if ( pointno >= mPointState->size() )
484  {
485  mPointState->resize( mPointState->size() + 1 );
486  }
487 
488  ( *mPointState )[pointno] = status;
489 
490  return true;
491 }
492 
493 //weighted method of little
495 {
496  int numberPoints = getNumberOfPoints();
497  for ( int i = 0; i < numberPoints; i++ )
498  {
499  if ( feedback )
500  {
501  feedback->setProgress( 100.0 * static_cast< double >( i ) / numberPoints );
502  }
504  }
505 
506  return true;
507 }
508 
510 {
511  if ( mTIN )
512  {
513  if ( alreadyestimated )
514  {
517  }
518  else
519  {
521  }
522  }
523  else
524  {
525  QgsDebugMsg( QStringLiteral( "warning, null pointer" ) );
526  }
527 }
528 
530 {
531  if ( pointno >= 0 )
532  {
533  ( *mPointState )[pointno] = s;
534  }
535  else
536  {
537  QgsDebugMsg( QStringLiteral( "warning, pointno>0" ) );
538  }
539 }
540 
541 bool NormVecDecorator::swapEdge( double x, double y )
542 {
543  if ( mTIN )
544  {
545  bool b = false;
546  if ( alreadyestimated )
547  {
548  QList<int> *list = getPointsAroundEdge( x, y );
549  if ( list )
550  {
551  b = mTIN->swapEdge( x, y );
552  QList<int>::iterator it;
553  for ( it = list->begin(); it != list->end(); ++it )
554  {
555  estimateFirstDerivative( ( *it ) );
556  }
557  delete list;
558  }
559  }
560  else
561  {
562  b = mTIN->swapEdge( x, y );
563  }
564  return b;
565  }
566  else
567  {
568  QgsDebugMsg( QStringLiteral( "warning, null pointer" ) );
569  return false;
570  }
571 }
572 
574 {
575  if ( !mTIN )
576  {
577  return false;
578  }
579  return mTIN->saveTriangulation( sink, feedback );
580 }
581 
Triangulation::saveTriangulation
virtual bool saveTriangulation(QgsFeatureSink *sink, QgsFeedback *feedback=nullptr) const =0
Saves the triangulation features to a feature sink.
qgsfields.h
QgsFeedback::setProgress
void setProgress(double progress)
Sets the current progress for the feedback object.
Definition: qgsfeedback.h:75
NormVecDecorator::alreadyestimated
bool alreadyestimated
Is true, if the normals already have been estimated.
Definition: NormVecDecorator.h:73
NormVecDecorator::eliminateHorizontalTriangles
void eliminateHorizontalTriangles() override
Eliminates the horizontal triangles by swapping or by insertion of new points. If alreadyestimated is...
Definition: NormVecDecorator.cpp:509
Vector3D::setX
void setX(double x)
Sets the x-component of the vector.
Definition: Vector3D.h:103
NormVecDecorator::BreakLine
@ BreakLine
Definition: NormVecDecorator.h:40
NormVecDecorator.h
MathUtils::pointInsideTriangle
bool ANALYSIS_EXPORT pointInsideTriangle(double x, double y, QgsPoint *p1, QgsPoint *p2, QgsPoint *p3)
Returns true, if the point with coordinates x and y is inside (or at the edge) of the triangle p1,...
Definition: MathUtils.cpp:680
QgsPoint
Point geometry type, with support for z-dimension and m-values.
Definition: qgspoint.h:37
NormVecDecorator::calcNormalForPoint
bool calcNormalForPoint(double x, double y, int point, Vector3D *result)
Calculates the normal of a triangle-point for the point with coordinates x and y. This is needed,...
Definition: NormVecDecorator.cpp:103
TriDecorator::getPoint
QgsPoint * getPoint(int i) const override
Returns a pointer to the point with number i. Any virtual points must have the number -1.
Definition: TriDecorator.cpp:86
NormVecDecorator::Normal
@ Normal
Definition: NormVecDecorator.h:40
Vector3D::standardise
void standardise()
Standardises the vector.
Definition: Vector3D.cpp:24
qgspoint.h
TriDecorator::mTIN
Triangulation * mTIN
Association with a Triangulation object.
Definition: TriDecorator.h:67
QgsDebugMsg
#define QgsDebugMsg(str)
Definition: qgslogger.h:38
NormVecDecorator::mPointState
QVector< PointState > * mPointState
Vector who stores, it a point is not on a breakline, if it is a normal point of the breakline or if i...
Definition: NormVecDecorator.h:80
TriDecorator::getSurroundingTriangles
QList< int > getSurroundingTriangles(int pointno) override
Returns a pointer to a value list with the information of the triangles surrounding (counterclockwise...
Definition: TriDecorator.cpp:155
NormVecDecorator::calcNormal
bool calcNormal(double x, double y, Vector3D *result) override
Calculates the normal at a point on the surface and assigns it to 'result'. Returns true in case of s...
Definition: NormVecDecorator.cpp:83
NormVecDecorator::setState
void setState(int pointno, PointState s)
Sets the state (BreakLine, Normal, EndPoint) of a point.
Definition: NormVecDecorator.cpp:529
TriDecorator::getPointsAroundEdge
QList< int > * getPointsAroundEdge(double x, double y) override
Returns a value list with the numbers of the four points, which would be affected by an edge swap.
Definition: TriDecorator.cpp:334
Vector3D::getZ
double getZ() const
Returns the z-component of the vector.
Definition: Vector3D.h:98
QgsFeedback
Definition: qgsfeedback.h:43
NormVecDecorator::getState
PointState getState(int pointno) const
Returns the state of the point with the number 'pointno'.
Definition: NormVecDecorator.cpp:293
Vector3D::getY
double getY() const
Returns the y-component of the vector.
Definition: Vector3D.h:93
NormVecDecorator::~NormVecDecorator
~NormVecDecorator() override
Definition: NormVecDecorator.cpp:27
NormVecDecorator::estimateFirstDerivatives
bool estimateFirstDerivatives(QgsFeedback *feedback=nullptr)
This method adds the functionality of estimating normals at the data points. Return true in the case ...
Definition: NormVecDecorator.cpp:494
QgsPoint::distance3D
double distance3D(double x, double y, double z) const
Returns the Cartesian 3D distance between this point and a specified x, y, z coordinate.
Definition: qgspoint.cpp:630
Triangulation::getSurroundingTriangles
virtual QList< int > getSurroundingTriangles(int pointno)=0
Returns a pointer to a value list with the information of the triangles surrounding (counterclockwise...
TriDecorator::getNumberOfPoints
int getNumberOfPoints() const override
Returns the number of points.
Definition: TriDecorator.cpp:128
MathUtils::normalFromPoints
void ANALYSIS_EXPORT normalFromPoints(QgsPoint *p1, QgsPoint *p2, QgsPoint *p3, Vector3D *vec)
Calculates the normal vector of the plane through the points p1, p2 and p3 and assigns the result to ...
Definition: MathUtils.cpp:632
Triangulation::addPoint
virtual int addPoint(const QgsPoint &point)=0
Adds a point to the triangulation.
NormVecDecorator::EndPoint
@ EndPoint
Definition: NormVecDecorator.h:40
Vector3D::setY
void setY(double y)
Sets the y-component of the vector.
Definition: Vector3D.h:108
NormVecDecorator::swapEdge
bool swapEdge(double x, double y) override
Swaps the edge which is closest to the point with x and y coordinates (if this is possible) and force...
Definition: NormVecDecorator.cpp:541
Vector3D::setZ
void setZ(double z)
Sets the z-component of the vector.
Definition: Vector3D.h:113
NormVecDecorator::addPoint
int addPoint(const QgsPoint &p) override
Adds a point to the triangulation.
Definition: NormVecDecorator.cpp:43
TriangleInterpolator::calcNormVec
virtual bool calcNormVec(double x, double y, Vector3D *result)=0
Calculates the normal vector and assigns it to vec.
TriangleInterpolator::calcPoint
virtual bool calcPoint(double x, double y, QgsPoint &result)=0
Performs a linear interpolation in a triangle and assigns the x-,y- and z-coordinates to point.
Triangulation::swapEdge
virtual bool swapEdge(double x, double y)=0
Reads the content of a taff-file.
NormVecDecorator::mNormVec
QVector< Vector3D * > * mNormVec
Vector that stores the normals for the points. If 'estimateFirstDerivatives()' was called and there i...
Definition: NormVecDecorator.h:78
NormVecDecorator::mInterpolator
TriangleInterpolator * mInterpolator
Association with an interpolator object.
Definition: NormVecDecorator.h:76
NormVecDecorator::calcPoint
bool calcPoint(double x, double y, QgsPoint &result) override
Calculates x-, y and z-value of the point on the surface and assigns it to 'result'.
Definition: NormVecDecorator.cpp:228
qgslogger.h
Vector3D
Definition: Vector3D.h:33
TriDecorator::getTriangle
bool getTriangle(double x, double y, QgsPoint &p1, int &n1, QgsPoint &p2, int &n2, QgsPoint &p3, int &n3) override
Finds out in which triangle the point with coordinates x and y is and assigns the numbers of the vert...
Definition: TriDecorator.cpp:100
Triangulation::eliminateHorizontalTriangles
virtual void eliminateHorizontalTriangles()=0
Eliminates the horizontal triangles by swapping.
NormVecDecorator::PointState
PointState
Enumeration for the state of a point. Normal means, that the point is not on a BreakLine,...
Definition: NormVecDecorator.h:40
qgsfeedback.h
NormVecDecorator::saveTriangulation
bool saveTriangulation(QgsFeatureSink *sink, QgsFeedback *feedback=nullptr) const override
Saves the triangulation features to a feature sink.
Definition: NormVecDecorator.cpp:573
Vector3D::getX
double getX() const
Returns the x-component of the vector.
Definition: Vector3D.h:88
NormVecDecorator::getTriangle
bool getTriangle(double x, double y, QgsPoint &p1, Vector3D *v1, QgsPoint &p2, Vector3D *v2, QgsPoint &p3, Vector3D *v3)
Finds out, in which triangle a point with coordinates x and y is and assigns the triangle points to p...
Definition: NormVecDecorator.cpp:249
QgsFeatureSink
Definition: qgsfeaturesink.h:33
NormVecDecorator::estimateFirstDerivative
bool estimateFirstDerivative(int pointno)
Estimates the first derivative a point. Return true in case of success and false otherwise.
Definition: NormVecDecorator.cpp:346