QGIS API Documentation  2.99.0-Master (19b062c)
DualEdgeTriangulation.h
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1 /***************************************************************************
2  DualEdgeTriangulation.h - description
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 #ifndef DUALEDGETRIANGULATION_H
18 #define DUALEDGETRIANGULATION_H
19 
20 #include "Triangulation.h"
21 #include "qgis_sip.h"
22 #include "HalfEdge.h"
23 #include <QVector>
24 #include <QList>
25 #include <QSet>
26 #include <QColor>
27 #include <QFile>
28 #include <QTextStream>
29 #include <QMessageBox>
30 #include <cfloat>
31 #include <QBuffer>
32 #include <QStringList>
33 #include <QCursor>
34 #include "qgis_analysis.h"
35 
36 #define SIP_NO_FILE
37 
43 class ANALYSIS_EXPORT DualEdgeTriangulation: public Triangulation
44 {
45  public:
47  DualEdgeTriangulation( int nop, Triangulation *decorator );
48  virtual ~DualEdgeTriangulation();
49  void setDecorator( Triangulation *d ) {mDecorator = d;}
50  void addLine( const QVector< QgsPoint > &points, QgsInterpolator::SourceType lineType ) override;
51  int addPoint( const QgsPoint &p ) override;
53  virtual void performConsistencyTest() override;
55  virtual bool calcNormal( double x, double y, Vector3D *result SIP_OUT ) override;
56  bool calcPoint( double x, double y, QgsPoint &result SIP_OUT ) override;
58  //virtual void draw(QPainter* p, double xlowleft, double ylowleft, double xupright, double yupright, double width, double height) const;
60  virtual QgsPoint *getPoint( int i ) const override;
61  int getOppositePoint( int p1, int p2 ) override;
62  bool getTriangle( double x, double y, QgsPoint &p1 SIP_OUT, int &n1 SIP_OUT, QgsPoint &p2 SIP_OUT, int &n2 SIP_OUT, QgsPoint &p3 SIP_OUT, int &n3 SIP_OUT ) SIP_PYNAME( getTriangleVertices ) override;
63  bool getTriangle( double x, double y, QgsPoint &p1 SIP_OUT, QgsPoint &p2 SIP_OUT, QgsPoint &p3 SIP_OUT ) override;
64  QList<int> getSurroundingTriangles( int pointno ) override;
66  virtual double getXMax() const override { return xMax; }
68  virtual double getXMin() const override { return xMin; }
70  virtual double getYMax() const override { return yMax; }
72  virtual double getYMin() const override { return yMin; }
74  virtual int getNumberOfPoints() const override;
78  virtual void setEdgeColor( int r, int g, int b ) override;
80  virtual void setForcedEdgeColor( int r, int g, int b ) override;
82  virtual void setBreakEdgeColor( int r, int g, int b ) override;
84  void setTriangleInterpolator( TriangleInterpolator *interpolator ) override;
86  void eliminateHorizontalTriangles() override;
88  virtual void ruppertRefinement() override;
90  bool pointInside( double x, double y ) override;
92  //bool readFromTAFF(QString fileName);
94  //bool saveToTAFF(QString fileName) const;
96  virtual bool swapEdge( double x, double y ) override;
98  virtual QList<int> *getPointsAroundEdge( double x, double y ) override;
99 
100  virtual bool saveTriangulation( QgsFeatureSink *sink, QgsFeedback *feedback = nullptr ) const override;
101 
102  protected:
104  double xMax = 0;
106  double xMin = 0;
108  double yMax = 0;
110  double yMin = 0;
112  static const unsigned int DEFAULT_STORAGE_FOR_POINTS = 100000;
114  QVector<QgsPoint *> mPointVector;
116  static const unsigned int DEFAULT_STORAGE_FOR_HALF_EDGES = 300006;
118  QVector<HalfEdge *> mHalfEdge;
120  TriangleInterpolator *mTriangleInterpolator = nullptr;
124  QColor mEdgeColor;
130  Triangulation *mDecorator = nullptr;
132  unsigned int insertEdge( int dual, int next, int point, bool mbreak, bool forced );
134  int insertForcedSegment( int p1, int p2, QgsInterpolator::SourceType segmentType );
136  //const static double leftOfTresh=0.00001;
138  static const int MAX_BASE_ITERATIONS = 300000;
140  int baseEdgeOfPoint( int point );
142  int baseEdgeOfTriangle( const QgsPoint &point );
144  bool checkSwap( unsigned int edge, unsigned int recursiveDeep );
146  void doSwap( unsigned int edge, unsigned int recursiveDeep );
148  void doOnlySwap( unsigned int edge );
150  unsigned int mEdgeInside = 0;
152  unsigned int mEdgeOutside = 0;
154  unsigned int mEdgeWithPoint = 0;
156  unsigned int mUnstableEdge = 0;
158  int mTwiceInsPoint = 0;
160  bool swapPossible( unsigned int edge );
162  void triangulatePolygon( QList<int> *poly, QList<int> *free, int mainedge );
164  bool halfEdgeBBoxTest( int edge, double xlowleft, double ylowleft, double xupright, double yupright ) const;
166  double swapMinAngle( int edge ) const;
168  int splitHalfEdge( int edge, float position );
170  bool edgeOnConvexHull( int edge );
172  void evaluateInfluenceRegion( QgsPoint *point, int edge, QSet<int> &set );
173 
174  friend class TestQgsInterpolator;
175 };
176 
177 #ifndef SIP_RUN
178 
180  : mEdgeColor( 0, 255, 0 )
181  , mForcedEdgeColor( 0, 0, 255 )
182  , mBreakEdgeColor( 100, 100, 0 )
183  , mDecorator( this )
184 {
187 }
188 
190  : mEdgeColor( 0, 255, 0 )
191  , mForcedEdgeColor( 0, 0, 255 )
192  , mBreakEdgeColor( 100, 100, 0 )
193  , mDecorator( decorator ? decorator : this )
194 {
195  mPointVector.reserve( nop );
196  mHalfEdge.reserve( nop );
197 }
198 
200 {
201  return mPointVector.count();
202 }
203 
205 {
206  if ( i < 0 || i >= mPointVector.count() )
207  return nullptr;
208 
209  return mPointVector.at( i );
210 }
211 
212 inline bool DualEdgeTriangulation::halfEdgeBBoxTest( int edge, double xlowleft, double ylowleft, double xupright, double yupright ) const
213 {
214  return (
215  ( getPoint( mHalfEdge[edge]->getPoint() )->x() >= xlowleft &&
216  getPoint( mHalfEdge[edge]->getPoint() )->x() <= xupright &&
217  getPoint( mHalfEdge[edge]->getPoint() )->y() >= ylowleft &&
218  getPoint( mHalfEdge[edge]->getPoint() )->y() <= yupright ) ||
219  ( getPoint( mHalfEdge[mHalfEdge[edge]->getDual()]->getPoint() )->x() >= xlowleft &&
220  getPoint( mHalfEdge[mHalfEdge[edge]->getDual()]->getPoint() )->x() <= xupright &&
221  getPoint( mHalfEdge[mHalfEdge[edge]->getDual()]->getPoint() )->y() >= ylowleft &&
222  getPoint( mHalfEdge[mHalfEdge[edge]->getDual()]->getPoint() )->y() <= yupright )
223  );
224 }
225 
226 #endif
227 #endif
228 
229 
230 
Triangulation * mDecorator
Pointer to the decorator using this triangulation. It it is used directly, mDecorator equals this...
static const unsigned int DEFAULT_STORAGE_FOR_HALF_EDGES
Default value for the number of storable HalfEdges at the beginning.
virtual bool swapEdge(double x, double y)=0
Reads the content of a taff-file.
virtual void setBreakEdgeColor(int r, int g, int b)=0
Sets the color of the breaklines.
The status of the first inserted forced line is reset to that of a normal edge (so that the second in...
Definition: Triangulation.h:45
virtual void setEdgeColor(int r, int g, int b)=0
Sets the color of the normal edges.
An interface for objects which accept features via addFeature(s) methods.
virtual QgsPoint * getPoint(int i) const override
Draws the points, edges and the forced lines.
bool halfEdgeBBoxTest(int edge, double xlowleft, double ylowleft, double xupright, double yupright) const
Tests, if the bounding box of the halfedge with index i intersects the specified bounding box...
virtual int getNumberOfPoints() const override
Returns the number of points.
virtual void performConsistencyTest()=0
Performs a consistency check, remove this later.
virtual void ruppertRefinement()=0
Adds points to make the triangles better shaped (algorithm of ruppert)
SourceType
Describes the type of input data.
DualEdgeTriangulation is an implementation of a triangulation class based on the dual edge data struc...
QVector< HalfEdge * > mHalfEdge
Stores pointers to the HalfEdges.
Base class for feedback objects to be used for cancelation of something running in a worker thread...
Definition: qgsfeedback.h:44
virtual bool pointInside(double x, double y)=0
Returns true, if the point with coordinates x and y is inside the convex hull and false otherwise...
virtual QgsPoint * getPoint(int i) const =0
Returns a pointer to the point with number i. Any virtual points must have the number -1...
Class Vector3D represents a 3D-Vector, capable to store x-,y- and z-coordinates in double values...
Definition: Vector3D.h:33
virtual double getYMax() const override
Returns the largest y-coordinate value of the bounding box.
virtual bool saveTriangulation(QgsFeatureSink *sink, QgsFeedback *feedback=nullptr) const =0
Saves the triangulation features to a feature sink.
This is an interface for interpolator classes for triangulations.
void setDecorator(Triangulation *d)
QColor mForcedEdgeColor
Color to paint the forced edges.
virtual double getYMin() const override
Returns the smallest x-coordinate value of the bounding box.
virtual double getXMax() const override
Returns the largest x-coordinate value of the bounding box.
virtual int getNumberOfPoints() const =0
Returns the number of points.
virtual void setForcedEdgeColor(int r, int g, int b)=0
Sets the color of the forced edges.
virtual bool getTriangle(double x, double y, QgsPoint &p1, int &n1, QgsPoint &p2, int &n2, QgsPoint &p3, int &n3)=0
Finds out in which triangle the point with coordinates x and y is and assigns the numbers of the vert...
Interface for Triangulation classes.
Definition: Triangulation.h:38
QColor mBreakEdgeColor
Color to paint the breaklines.
Point geometry type, with support for z-dimension and m-values.
Definition: qgspoint.h:37
virtual double getXMin() const override
Returns the smallest x-coordinate value of the bounding box.
virtual int addPoint(const QgsPoint &point)=0
Adds a point to the triangulation.
virtual bool calcNormal(double x, double y, Vector3D *result)=0
Calculates the normal at a point on the surface and assigns it to &#39;result&#39;.
virtual QList< int > getSurroundingTriangles(int pointno)=0
Returns a pointer to a value list with the information of the triangles surrounding (counterclockwise...
virtual QList< int > * getPointsAroundEdge(double x, double y)=0
Returns a value list with the numbers of the four points, which would be affected by an edge swap...
#define SIP_OUT
Definition: qgis_sip.h:51
virtual void setForcedCrossBehavior(Triangulation::ForcedCrossBehavior b)=0
Draws the points, edges and the forced lines.
QVector< QgsPoint * > mPointVector
Stores pointers to all points in the triangulations (including the points contained in the lines) ...
static const unsigned int DEFAULT_STORAGE_FOR_POINTS
Default value for the number of storable points at the beginning.
virtual void addLine(const QVector< QgsPoint > &points, QgsInterpolator::SourceType lineType)=0
Adds a line (e.g.
virtual void eliminateHorizontalTriangles()=0
Eliminates the horizontal triangles by swapping.
QColor mEdgeColor
Color to paint the normal edges.
virtual int getOppositePoint(int p1, int p2)=0
Returns the number of the point opposite to the triangle points p1, p2 (which have to be on a halfedg...
ForcedCrossBehavior
Enumeration describing the behavior, if two forced lines cross.
Definition: Triangulation.h:42
virtual bool calcPoint(double x, double y, QgsPoint &result)=0
Calculates x-, y and z-value of the point on the surface and assigns it to &#39;result&#39;.
#define SIP_PYNAME(name)
Definition: qgis_sip.h:74
virtual void setTriangleInterpolator(TriangleInterpolator *interpolator)=0
Sets an interpolator object.