QGIS API Documentation  2.14.0-Essen
qgsgeometry.h
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1 /***************************************************************************
2  qgsgeometry.h - Geometry (stored as Open Geospatial Consortium WKB)
3  -------------------------------------------------------------------
4 Date : 02 May 2005
5 Copyright : (C) 2005 by Brendan Morley
6 email : morb at ozemail dot com dot au
7  ***************************************************************************
8  * *
9  * This program is free software; you can redistribute it and/or modify *
10  * it under the terms of the GNU General Public License as published by *
11  * the Free Software Foundation; either version 2 of the License, or *
12  * (at your option) any later version. *
13  * *
14  ***************************************************************************/
15 
16 #ifndef QGSGEOMETRY_H
17 #define QGSGEOMETRY_H
18 
19 #include <QString>
20 #include <QVector>
21 #include <QDomDocument>
22 
23 #include "qgis.h"
24 
25 #include <geos_c.h>
26 #include <climits>
27 
28 #if defined(GEOS_VERSION_MAJOR) && (GEOS_VERSION_MAJOR<3)
29 #define GEOSGeometry struct GEOSGeom_t
30 #define GEOSCoordSequence struct GEOSCoordSeq_t
31 #endif
32 
33 #include "qgsabstractgeometryv2.h"
34 #include "qgspoint.h"
35 #include "qgscoordinatetransform.h"
36 #include "qgsfeature.h"
37 #include <limits>
38 #include <QSet>
39 
40 class QgsGeometryEngine;
41 class QgsVectorLayer;
42 class QgsMapToPixel;
43 class QPainter;
45 
48 
51 
54 
57 
60 
61 class QgsRectangle;
62 
63 class QgsConstWkbPtr;
64 
65 struct QgsGeometryPrivate;
66 
76 class CORE_EXPORT QgsGeometry
77 {
78  public:
80  QgsGeometry();
81 
83  QgsGeometry( const QgsGeometry & );
84 
88  QgsGeometry & operator=( QgsGeometry const & rhs );
89 
94  explicit QgsGeometry( QgsAbstractGeometryV2* geom );
95 
97  ~QgsGeometry();
98 
103  QgsAbstractGeometryV2* geometry() const;
104 
109  void setGeometry( QgsAbstractGeometryV2* geometry );
110 
116  bool isEmpty() const;
117 
119  static QgsGeometry* fromWkt( const QString& wkt );
121  static QgsGeometry* fromPoint( const QgsPoint& point );
123  static QgsGeometry* fromMultiPoint( const QgsMultiPoint& multipoint );
125  static QgsGeometry* fromPolyline( const QgsPolyline& polyline );
127  static QgsGeometry* fromMultiPolyline( const QgsMultiPolyline& multiline );
129  static QgsGeometry* fromPolygon( const QgsPolygon& polygon );
131  static QgsGeometry* fromMultiPolygon( const QgsMultiPolygon& multipoly );
133  static QgsGeometry* fromRect( const QgsRectangle& rect );
134 
140  void fromGeos( GEOSGeometry* geos );
141 
146  void fromWkb( unsigned char *wkb, int length );
147 
153  const unsigned char* asWkb() const;
154 
159  int wkbSize() const;
160 
166  const GEOSGeometry* asGeos( double precision = 0 ) const;
167 
171  QGis::WkbType wkbType() const;
172 
176  QGis::GeometryType type() const;
177 
179  bool isMultipart() const;
180 
184  bool isGeosEqual( const QgsGeometry& ) const;
185 
189  bool isGeosValid() const;
190 
194  bool isGeosEmpty() const;
195 
199  double area() const;
200 
204  double length() const;
205 
212  double distance( const QgsGeometry& geom ) const;
213 
218  QgsPoint closestVertex( const QgsPoint& point, int& atVertex, int& beforeVertex, int& afterVertex, double& sqrDist ) const;
219 
232  void adjacentVertices( int atVertex, int& beforeVertex, int& afterVertex ) const;
233 
245  bool insertVertex( double x, double y, int beforeVertex );
246 
253  bool moveVertex( double x, double y, int atVertex );
254 
261  bool moveVertex( const QgsPointV2& p, int atVertex );
262 
273  bool deleteVertex( int atVertex );
274 
280  QgsPoint vertexAt( int atVertex ) const;
281 
287  double sqrDistToVertexAt( QgsPoint& point, int atVertex ) const;
288 
293  QgsGeometry nearestPoint( const QgsGeometry& other ) const;
294 
299  QgsGeometry shortestLine( const QgsGeometry& other ) const;
300 
307  double closestVertexWithContext( const QgsPoint& point, int& atVertex ) const;
308 
319  double closestSegmentWithContext( const QgsPoint& point, QgsPoint& minDistPoint, int& afterVertex, double* leftOf = nullptr, double epsilon = DEFAULT_SEGMENT_EPSILON ) const;
320 
324  // TODO QGIS 3.0 returns an enum instead of a magic constant
325  int addRing( const QList<QgsPoint>& ring );
326 
330  // TODO QGIS 3.0 returns an enum instead of a magic constant
331  int addRing( QgsCurveV2* ring );
332 
339  // TODO QGIS 3.0 returns an enum instead of a magic constant
340  int addPart( const QList<QgsPoint> &points, QGis::GeometryType geomType = QGis::UnknownGeometry );
341 
348  // TODO QGIS 3.0 returns an enum instead of a magic constant
349  int addPart( const QgsPointSequenceV2 &points, QGis::GeometryType geomType = QGis::UnknownGeometry );
350 
357  // TODO QGIS 3.0 returns an enum instead of a magic constant
358  int addPart( QgsAbstractGeometryV2* part, QGis::GeometryType geomType = QGis::UnknownGeometry );
359 
366  // TODO QGIS 3.0 returns an enum instead of a magic constant
367  int addPart( GEOSGeometry *newPart );
368 
374  // TODO QGIS 3.0 returns an enum instead of a magic constant
375  int addPart( const QgsGeometry *newPart );
376 
379  int translate( double dx, double dy );
380 
383  int transform( const QgsCoordinateTransform& ct );
384 
388  int transform( const QTransform& ct );
389 
395  int rotate( double rotation, const QgsPoint& center );
396 
403  // TODO QGIS 3.0 returns an enum instead of a magic constant
404  int splitGeometry( const QList<QgsPoint>& splitLine,
405  QList<QgsGeometry*>&newGeometries,
406  bool topological,
407  QList<QgsPoint> &topologyTestPoints );
408 
413  int reshapeGeometry( const QList<QgsPoint>& reshapeWithLine );
414 
419  int makeDifference( const QgsGeometry* other );
420 
422  QgsRectangle boundingBox() const;
423 
425  bool intersects( const QgsRectangle& r ) const;
426 
428  bool intersects( const QgsGeometry* geometry ) const;
429 
431  bool contains( const QgsPoint* p ) const;
432 
435  bool contains( const QgsGeometry* geometry ) const;
436 
439  bool disjoint( const QgsGeometry* geometry ) const;
440 
443  bool equals( const QgsGeometry* geometry ) const;
444 
447  bool touches( const QgsGeometry* geometry ) const;
448 
451  bool overlaps( const QgsGeometry* geometry ) const;
452 
455  bool within( const QgsGeometry* geometry ) const;
456 
459  bool crosses( const QgsGeometry* geometry ) const;
460 
463  QgsGeometry* buffer( double distance, int segments ) const;
464 
474  QgsGeometry* buffer( double distance, int segments, int endCapStyle, int joinStyle, double mitreLimit ) const;
475 
481  QgsGeometry* offsetCurve( double distance, int segments, int joinStyle, double mitreLimit ) const;
482 
484  QgsGeometry* simplify( double tolerance ) const;
485 
490  QgsGeometry* centroid() const;
491 
493  QgsGeometry* pointOnSurface() const;
494 
496  QgsGeometry* convexHull() const;
497 
502  QgsGeometry* interpolate( double distance ) const;
503 
505  QgsGeometry* intersection( const QgsGeometry* geometry ) const;
506 
511  QgsGeometry* combine( const QgsGeometry* geometry ) const;
512 
514  QgsGeometry* difference( const QgsGeometry* geometry ) const;
515 
517  QgsGeometry* symDifference( const QgsGeometry* geometry ) const;
518 
520  QgsGeometry extrude( double x, double y );
521 
526  QString exportToWkt( int precision = 17 ) const;
527 
534  QString exportToGeoJSON( int precision = 17 ) const;
535 
542  QgsGeometry* convertToType( QGis::GeometryType destType, bool destMultipart = false ) const;
543 
544  /* Accessor functions for getting geometry data */
545 
549  QgsPoint asPoint() const;
550 
554  QgsPolyline asPolyline() const;
555 
559  QgsPolygon asPolygon() const;
560 
563  QgsMultiPoint asMultiPoint() const;
564 
567  QgsMultiPolyline asMultiPolyline() const;
568 
571  QgsMultiPolygon asMultiPolygon() const;
572 
575  QList<QgsGeometry*> asGeometryCollection() const;
576 
581  QPointF asQPointF() const;
582 
588  QPolygonF asQPolygonF() const;
589 
594  bool deleteRing( int ringNum, int partNum = 0 );
595 
599  bool deletePart( int partNum );
600 
609  bool convertToMultiType();
610 
620  bool convertToSingleType();
621 
630  int avoidIntersections( const QMap<QgsVectorLayer*, QSet<QgsFeatureId> >& ignoreFeatures = ( QMap<QgsVectorLayer*, QSet<QgsFeatureId> >() ) );
631 
632  class Error
633  {
634  QString message;
635  QgsPoint location;
636  bool hasLocation;
637  public:
638  Error() : message( "none" ), hasLocation( false ) {}
639  explicit Error( const QString& m ) : message( m ), hasLocation( false ) {}
640  Error( const QString& m, const QgsPoint& p ) : message( m ), location( p ), hasLocation( true ) {}
641 
642  QString what() { return message; }
643  QgsPoint where() { return location; }
644  bool hasWhere() { return hasLocation; }
645  };
646 
651  void validateGeometry( QList<Error> &errors );
652 
657  static QgsGeometry *unaryUnion( const QList<QgsGeometry*>& geometryList );
658 
663  void convertToStraightSegment();
664 
670  bool requiresConversionToStraightSegments() const;
671 
676  void mapToPixel( const QgsMapToPixel& mtp );
677 
678  // not implemented for 2.10
679  /* Clips the geometry using the specified rectangle
680  * @param rect clip rectangle
681  * @note added in QGIS 2.10
682  */
683  // void clip( const QgsRectangle& rect );
684 
689  void draw( QPainter& p ) const;
690 
698  bool vertexIdFromVertexNr( int nr, QgsVertexId& id ) const;
699 
706  int vertexNrFromVertexId( QgsVertexId i ) const;
707 
712  static GEOSContextHandle_t getGEOSHandler();
713 
718  static QgsGeometry* fromQPointF( QPointF point );
719 
726  static QgsGeometry* fromQPolygonF( const QPolygonF& polygon );
727 
733  static QgsPolyline createPolylineFromQPolygonF( const QPolygonF &polygon );
734 
740  static QgsPolygon createPolygonFromQPolygonF( const QPolygonF &polygon );
741 
750  static bool compare( const QgsPolyline& p1, const QgsPolyline& p2, double epsilon = 4 * std::numeric_limits<double>::epsilon() );
751 
760  static bool compare( const QgsPolygon& p1, const QgsPolygon& p2, double epsilon = 4 * std::numeric_limits<double>::epsilon() );
761 
771  static bool compare( const QgsMultiPolygon& p1, const QgsMultiPolygon& p2, double epsilon = 4 * std::numeric_limits<double>::epsilon() );
772 
782  QgsGeometry* smooth( const unsigned int iterations = 1, const double offset = 0.25 ) const;
783 
785  QgsPolygon smoothPolygon( const QgsPolygon &polygon, const unsigned int iterations = 1, const double offset = 0.25 ) const;
787  QgsPolyline smoothLine( const QgsPolyline &polyline, const unsigned int iterations = 1, const double offset = 0.25 ) const;
788 
791  static QgsGeometryEngine* createGeometryEngine( const QgsAbstractGeometryV2* geometry );
792 
797  static void convertPointList( const QList<QgsPoint> &input, QgsPointSequenceV2 &output );
798 
803  static void convertPointList( const QgsPointSequenceV2 &input, QList<QgsPoint> &output );
804 
805  private:
806 
807  QgsGeometryPrivate* d; //implicitely shared data pointer
808 
809  void detach( bool cloneGeom = true ); //make sure mGeometry only referenced from this instance
810  void removeWkbGeos();
811 
812  static void convertToPolyline( const QgsPointSequenceV2 &input, QgsPolyline& output );
813  static void convertPolygon( const QgsPolygonV2& input, QgsPolygon& output );
814 
816  QgsGeometry* convertToPoint( bool destMultipart ) const;
818  QgsGeometry* convertToLine( bool destMultipart ) const;
820  QgsGeometry* convertToPolygon( bool destMultipart ) const;
821 }; // class QgsGeometry
822 
823 Q_DECLARE_METATYPE( QgsGeometry )
824 
825 
826 CORE_EXPORT QDataStream& operator<<( QDataStream& out, const QgsGeometry& geometry );
828 CORE_EXPORT QDataStream& operator>>( QDataStream& in, QgsGeometry& geometry );
829 
830 #endif
A rectangle specified with double values.
Definition: qgsrectangle.h:35
GeometryType
Definition: qgis.h:111
QgsPoint where()
Definition: qgsgeometry.h:643
Error(const QString &m)
Definition: qgsgeometry.h:639
QVector< QgsPoint > QgsPolyline
Polyline is represented as a vector of points.
Definition: qgsgeometry.h:44
Abstract base class for all geometries.
A geometry is the spatial representation of a feature.
Definition: qgsgeometry.h:76
WkbType
Used for symbology operations.
Definition: qgis.h:57
CORE_EXPORT QDataStream & operator<<(QDataStream &out, const QgsGeometry &geometry)
Writes the geometry to stream out.
Perform transforms between map coordinates and device coordinates.
Definition: qgsmaptopixel.h:34
Polygon geometry type.
Definition: qgspolygonv2.h:29
Utility class for identifying a unique vertex within a geometry.
const double DEFAULT_SEGMENT_EPSILON
Default snapping tolerance for segments.
Definition: qgis.h:382
Point geometry type, with support for z-dimension and m-values.
Definition: qgspointv2.h:34
QVector< QgsPolygon > QgsMultiPolygon
A collection of QgsPolygons that share a common collection of attributes.
Definition: qgsgeometry.h:59
QVector< QgsPoint > QgsMultiPoint
A collection of QgsPoints that share a common collection of attributes.
Definition: qgsgeometry.h:53
QVector< QgsPolyline > QgsPolygon
Polygon: first item of the list is outer ring, inner rings (if any) start from second item...
Definition: qgsgeometry.h:50
A class to represent a point.
Definition: qgspoint.h:65
CORE_EXPORT QDataStream & operator>>(QDataStream &in, QgsGeometry &geometry)
Reads a geometry from stream in into geometry.
QVector< QgsPolyline > QgsMultiPolyline
A collection of QgsPolylines that share a common collection of attributes.
Definition: qgsgeometry.h:56
Class for doing transforms between two map coordinate systems.
Contains geometry relation and modification algorithms.
double ANALYSIS_EXPORT leftOf(Point3D *thepoint, Point3D *p1, Point3D *p2)
Returns whether &#39;thepoint&#39; is left or right of the line from &#39;p1&#39; to &#39;p2&#39;.
Abstract base class for curved geometry type.
Definition: qgscurvev2.h:32
Represents a vector layer which manages a vector based data sets.
Error(const QString &m, const QgsPoint &p)
Definition: qgsgeometry.h:640