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Merge pull request #5791 from nyalldawson/geom_snapper_vertices
Fix geometry snapper sometimes creates unwanted overlapping segments when snapping line layers
2 parents f180ea4 + 5a81870 commit 32ba5bf

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lines changed

‎python/analysis/vector/qgsgeometrysnapper.sip

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@@ -28,6 +28,8 @@ class QgsGeometrySnapper : QObject
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{
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PreferNodes,
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PreferClosest,
31+
PreferNodesNoExtraVertices,
32+
PreferClosestNoExtraVertices,
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EndPointPreferNodes,
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EndPointPreferClosest,
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EndPointToEndPoint,

‎python/core/geometry/qgsabstractgeometry.sip

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@@ -436,6 +436,29 @@ Returns the centroid of the geometry
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:rtype: QgsAbstractGeometry
437437
%End
438438

439+
virtual bool removeDuplicateNodes( double epsilon = 4 * DBL_EPSILON, bool useZValues = false ) = 0;
440+
%Docstring
441+
Removes duplicate nodes from the geometry, wherever removing the nodes does not result in a
442+
degenerate geometry.
443+
444+
The ``epsilon`` parameter specifies the tolerance for coordinates when determining that
445+
vertices are identical.
446+
447+
By default, z values are not considered when detecting duplicate nodes. E.g. two nodes
448+
with the same x and y coordinate but different z values will still be considered
449+
duplicate and one will be removed. If ``useZValues`` is true, then the z values are
450+
also tested and nodes with the same x and y but different z will be maintained.
451+
452+
Note that duplicate nodes are not tested between different parts of a multipart geometry. E.g.
453+
a multipoint geometry with overlapping points will not be changed by this method.
454+
455+
The function will return true if nodes were removed, or false if no duplicate nodes
456+
were found.
457+
458+
.. versionadded:: 3.0
459+
:rtype: bool
460+
%End
461+
439462
virtual double vertexAngle( QgsVertexId vertex ) const = 0;
440463
%Docstring
441464
Returns approximate angle at a vertex. This is usually the average angle between adjacent

‎python/core/geometry/qgscircularstring.sip

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@@ -83,6 +83,9 @@ class QgsCircularString: QgsCurve
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virtual QgsCircularString *snappedToGrid( double hSpacing, double vSpacing, double dSpacing = 0, double mSpacing = 0 ) const /Factory/;
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86+
virtual bool removeDuplicateNodes( double epsilon = 4 * DBL_EPSILON, bool useZValues = false );
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8689
virtual void draw( QPainter &p ) const;
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virtual void transform( const QgsCoordinateTransform &ct, QgsCoordinateTransform::TransformDirection d = QgsCoordinateTransform::ForwardTransform,

‎python/core/geometry/qgscompoundcurve.sip

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@@ -79,6 +79,8 @@ class QgsCompoundCurve: QgsCurve
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virtual QgsCompoundCurve *snappedToGrid( double hSpacing, double vSpacing, double dSpacing = 0, double mSpacing = 0 ) const /Factory/;
8181

82+
virtual bool removeDuplicateNodes( double epsilon = 4 * DBL_EPSILON, bool useZValues = false );
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8385
int nCurves() const;
8486
%Docstring

‎python/core/geometry/qgscurvepolygon.sip

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@@ -67,6 +67,8 @@ class QgsCurvePolygon: QgsSurface
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virtual QgsCurvePolygon *snappedToGrid( double hSpacing, double vSpacing, double dSpacing = 0, double mSpacing = 0 ) const /Factory/;
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70+
virtual bool removeDuplicateNodes( double epsilon = 4 * DBL_EPSILON, bool useZValues = false );
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7173
int numInteriorRings() const;
7274
%Docstring

‎python/core/geometry/qgsgeometry.sip

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@@ -501,7 +501,7 @@ Returns true if WKB of the geometry is of WKBMulti* type
501501
\param afterVertex Receives index of the vertex after the closest segment. The vertex
502502
before the closest segment is always afterVertex - 1
503503
\param leftOf Out: Returns if the point lies on the left of left side of the geometry ( < 0 means left, > 0 means right, 0 indicates
504-
that the test was unsuccesful, e.g. for a point exactly on the line)
504+
that the test was unsuccessful, e.g. for a point exactly on the line)
505505
\param epsilon epsilon for segment snapping
506506
:return: The squared Cartesian distance is also returned in sqrDist, negative number on error
507507
:rtype: float
@@ -688,6 +688,29 @@ Returns true if WKB of the geometry is of WKBMulti* type
688688
:rtype: QgsGeometry
689689
%End
690690

691+
bool removeDuplicateNodes( double epsilon = 4 * DBL_EPSILON, bool useZValues = false );
692+
%Docstring
693+
Removes duplicate nodes from the geometry, wherever removing the nodes does not result in a
694+
degenerate geometry.
695+
696+
The ``epsilon`` parameter specifies the tolerance for coordinates when determining that
697+
vertices are identical.
698+
699+
By default, z values are not considered when detecting duplicate nodes. E.g. two nodes
700+
with the same x and y coordinate but different z values will still be considered
701+
duplicate and one will be removed. If ``useZValues`` is true, then the z values are
702+
also tested and nodes with the same x and y but different z will be maintained.
703+
704+
Note that duplicate nodes are not tested between different parts of a multipart geometry. E.g.
705+
a multipoint geometry with overlapping points will not be changed by this method.
706+
707+
The function will return true if nodes were removed, or false if no duplicate nodes
708+
were found.
709+
710+
.. versionadded:: 3.0
711+
:rtype: bool
712+
%End
713+
691714
bool intersects( const QgsRectangle &r ) const;
692715
%Docstring
693716
Tests for intersection with a rectangle (uses GEOS)

‎python/core/geometry/qgsgeometrycollection.sip

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@@ -52,6 +52,9 @@ class QgsGeometryCollection: QgsAbstractGeometry
5252
virtual void clear();
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virtual QgsGeometryCollection *snappedToGrid( double hSpacing, double vSpacing, double dSpacing = 0, double mSpacing = 0 ) const /Factory/;
55+
56+
virtual bool removeDuplicateNodes( double epsilon = 4 * DBL_EPSILON, bool useZValues = false );
57+
5558
virtual QgsAbstractGeometry *boundary() const /Factory/;
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5760
virtual void adjacentVertices( QgsVertexId vertex, QgsVertexId &previousVertex /Out/, QgsVertexId &nextVertex /Out/ ) const;

‎python/core/geometry/qgslinestring.sip

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@@ -179,6 +179,8 @@ Closes the line string by appending the first point to the end of the line, if i
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virtual QgsLineString *snappedToGrid( double hSpacing, double vSpacing, double dSpacing = 0, double mSpacing = 0 ) const /Factory/;
181181

182+
virtual bool removeDuplicateNodes( double epsilon = 4 * DBL_EPSILON, bool useZValues = false );
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183185
virtual bool fromWkb( QgsConstWkbPtr &wkb );
184186

‎python/core/geometry/qgspoint.sip

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@@ -339,6 +339,9 @@ class QgsPoint: QgsAbstractGeometry
339339
virtual QgsPoint *clone() const /Factory/;
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virtual QgsPoint *snappedToGrid( double hSpacing, double vSpacing, double dSpacing = 0, double mSpacing = 0 ) const /Factory/;
342+
343+
virtual bool removeDuplicateNodes( double epsilon = 4 * DBL_EPSILON, bool useZValues = false );
344+
342345
virtual void clear();
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344347
virtual bool fromWkb( QgsConstWkbPtr &wkb );

‎python/plugins/processing/algs/qgis/CheckValidity.py

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@@ -68,6 +68,9 @@ def icon(self):
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def group(self):
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return self.tr('Vector geometry')
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def tags(self):
72+
return self.tr('valid,invalid,detect').split(',')
73+
7174
def __init__(self):
7275
super().__init__()
7376

@@ -79,7 +82,7 @@ def initAlgorithm(self, config=None):
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT_LAYER,
8083
self.tr('Input layer')))
8184
self.addParameter(QgsProcessingParameterEnum(self.METHOD,
82-
self.tr('Method'), self.methods))
85+
self.tr('Method'), self.methods, defaultValue=2))
8386
self.parameterDefinition(self.METHOD).setMetadata({
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'widget_wrapper': {
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'class': 'processing.gui.wrappers.EnumWidgetWrapper',

‎python/plugins/processing/algs/qgis/SnapGeometries.py

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@@ -61,8 +61,10 @@ def initAlgorithm(self, config=None):
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self.addParameter(QgsProcessingParameterNumber(self.TOLERANCE, self.tr('Tolerance (layer units)'), type=QgsProcessingParameterNumber.Double,
6262
minValue=0.00000001, maxValue=9999999999, defaultValue=10.0))
6363

64-
self.modes = [self.tr('Prefer aligning nodes'),
65-
self.tr('Prefer closest point'),
64+
self.modes = [self.tr('Prefer aligning nodes, insert extra vertices where required'),
65+
self.tr('Prefer closest point, insert extra vertices where required'),
66+
self.tr('Prefer aligning nodes, don\'t insert new vertices'),
67+
self.tr('Prefer closest point, don\'t insert new vertices'),
6668
self.tr('Move end points only, prefer aligning nodes'),
6769
self.tr('Move end points only, prefer closest point'),
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self.tr('Snap end points to end points only')]

‎python/plugins/processing/tests/testdata/custom/line_duplicate_nodes.gml

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@@ -0,0 +1,19 @@
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<?xml version="1.0" encoding="utf-8" ?>
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<ogr:FeatureCollection
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://ogr.maptools.org/ line_duplicate_nodes.xsd"
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xmlns:ogr="http://ogr.maptools.org/"
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xmlns:gml="http://www.opengis.net/gml">
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<gml:boundedBy>
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<gml:Box>
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<gml:coord><gml:X>2</gml:X><gml:Y>0</gml:Y></gml:coord>
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<gml:coord><gml:X>3</gml:X><gml:Y>3</gml:Y></gml:coord>
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</gml:Box>
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</gml:boundedBy>
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<gml:featureMember>
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<ogr:line_duplicate_nodes fid="lines.2">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>2,0 2,2 3,2 3,3 3,3</gml:coordinates></gml:LineString></ogr:geometryProperty>
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</ogr:line_duplicate_nodes>
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</gml:featureMember>
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</ogr:FeatureCollection>

‎python/plugins/processing/tests/testdata/custom/line_duplicate_nodes.xsd

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<?xml version="1.0" encoding="UTF-8"?>
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<xs:schema targetNamespace="http://ogr.maptools.org/" xmlns:ogr="http://ogr.maptools.org/" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:gml="http://www.opengis.net/gml" elementFormDefault="qualified" version="1.0">
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<xs:import namespace="http://www.opengis.net/gml" schemaLocation="http://schemas.opengis.net/gml/2.1.2/feature.xsd"/>
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<xs:element name="FeatureCollection" type="ogr:FeatureCollectionType" substitutionGroup="gml:_FeatureCollection"/>
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<xs:complexType name="FeatureCollectionType">
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<xs:complexContent>
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<xs:extension base="gml:AbstractFeatureCollectionType">
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<xs:attribute name="lockId" type="xs:string" use="optional"/>
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<xs:attribute name="scope" type="xs:string" use="optional"/>
10+
</xs:extension>
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</xs:complexContent>
12+
</xs:complexType>
13+
<xs:element name="line_duplicate_nodes" type="ogr:line_duplicate_nodes_Type" substitutionGroup="gml:_Feature"/>
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<xs:complexType name="line_duplicate_nodes_Type">
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<xs:complexContent>
16+
<xs:extension base="gml:AbstractFeatureType">
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<xs:sequence>
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<xs:element name="geometryProperty" type="gml:LineStringPropertyType" nillable="true" minOccurs="0" maxOccurs="1"/>
19+
</xs:sequence>
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</xs:extension>
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</xs:complexContent>
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</xs:complexType>
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</xs:schema>

‎python/plugins/processing/tests/testdata/expected/removed_duplicated_nodes_line.gml

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<?xml version="1.0" encoding="utf-8" ?>
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<ogr:FeatureCollection
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
4+
xsi:schemaLocation="http://ogr.maptools.org/ removed_duplicated_nodes_line.xsd"
5+
xmlns:ogr="http://ogr.maptools.org/"
6+
xmlns:gml="http://www.opengis.net/gml">
7+
<gml:boundedBy>
8+
<gml:Box>
9+
<gml:coord><gml:X>2</gml:X><gml:Y>0</gml:Y></gml:coord>
10+
<gml:coord><gml:X>3</gml:X><gml:Y>3</gml:Y></gml:coord>
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</gml:Box>
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</gml:boundedBy>
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<gml:featureMember>
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<ogr:removed_duplicated_nodes_line fid="lines.2">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>2,0 2,2 3,2 3,3</gml:coordinates></gml:LineString></ogr:geometryProperty>
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</ogr:removed_duplicated_nodes_line>
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</gml:featureMember>
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</ogr:FeatureCollection>

‎python/plugins/processing/tests/testdata/expected/removed_duplicated_nodes_line.xsd

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<?xml version="1.0" encoding="UTF-8"?>
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<xs:schema targetNamespace="http://ogr.maptools.org/" xmlns:ogr="http://ogr.maptools.org/" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:gml="http://www.opengis.net/gml" elementFormDefault="qualified" version="1.0">
3+
<xs:import namespace="http://www.opengis.net/gml" schemaLocation="http://schemas.opengis.net/gml/2.1.2/feature.xsd"/>
4+
<xs:element name="FeatureCollection" type="ogr:FeatureCollectionType" substitutionGroup="gml:_FeatureCollection"/>
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<xs:complexType name="FeatureCollectionType">
6+
<xs:complexContent>
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<xs:extension base="gml:AbstractFeatureCollectionType">
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<xs:attribute name="lockId" type="xs:string" use="optional"/>
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<xs:attribute name="scope" type="xs:string" use="optional"/>
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</xs:extension>
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</xs:complexContent>
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</xs:complexType>
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<xs:element name="removed_duplicated_nodes_line" type="ogr:removed_duplicated_nodes_line_Type" substitutionGroup="gml:_Feature"/>
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<xs:complexType name="removed_duplicated_nodes_line_Type">
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<xs:complexContent>
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<xs:extension base="gml:AbstractFeatureType">
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<xs:sequence>
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<xs:element name="geometryProperty" type="gml:LineStringPropertyType" nillable="true" minOccurs="0" maxOccurs="1"/>
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</xs:sequence>
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</xs:extension>
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</xs:complexContent>
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</xs:complexType>
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</xs:schema>

‎python/plugins/processing/tests/testdata/expected/snap_lines_to_lines.gml

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</gml:featureMember>
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<gml:featureMember>
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<ogr:snap_lines_to_lines fid="lines.2">
26-
<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>2,0 2,2 2,2 3,2</gml:coordinates></gml:LineString></ogr:geometryProperty>
26+
<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>2,0 2,2 3,2</gml:coordinates></gml:LineString></ogr:geometryProperty>
2727
</ogr:snap_lines_to_lines>
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</gml:featureMember>
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<gml:featureMember>

‎python/plugins/processing/tests/testdata/expected/snap_polys_to_polys.gml

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<gml:featureMember>
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<ogr:snap_polys_to_polys fid="polys.0">
16-
<ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>-1,-1 -1,3 3,3 3,2 2,2 2,2 2,2 2,-1 -1,-1</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
16+
<ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>-1,-1 -1,3 3,3 3,2 2,2 2,-1 -1,-1</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
1717
<ogr:name>aaaaa</ogr:name>
1818
<ogr:intval>33</ogr:intval>
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<ogr:floatval>44.123456</ogr:floatval>

‎python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml

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@@ -4582,3 +4582,15 @@ tests:
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name: expected/difference.gml
45834583
type: vector
45844584

4585+
- algorithm: native:removeduplicatenodes
4586+
name: Remove duplicate nodes lines
4587+
params:
4588+
INPUT:
4589+
name: custom/line_duplicate_nodes.gml
4590+
type: vector
4591+
TOLERANCE: 1.0e-06
4592+
USE_Z_VALUE: false
4593+
results:
4594+
OUTPUT:
4595+
name: expected/removed_duplicated_nodes_line.gml
4596+
type: vector

‎src/analysis/CMakeLists.txt

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@@ -51,6 +51,7 @@ SET(QGIS_ANALYSIS_SRCS
5151
processing/qgsalgorithmpackage.cpp
5252
processing/qgsalgorithmpromotetomultipart.cpp
5353
processing/qgsalgorithmrasterlayeruniquevalues.cpp
54+
processing/qgsalgorithmremoveduplicatenodes
5455
processing/qgsalgorithmremovenullgeometry.cpp
5556
processing/qgsalgorithmrenamelayer.cpp
5657
processing/qgsalgorithmsaveselectedfeatures.cpp

‎src/analysis/processing/qgsalgorithmremoveduplicatenodes.cpp

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1+
/***************************************************************************
2+
qgsalgorithmremoveduplicatenodes.cpp
3+
---------------------
4+
begin : November 2017
5+
copyright : (C) 2017 by Nyall Dawson
6+
email : nyall dot dawson at gmail dot com
7+
***************************************************************************/
8+
9+
/***************************************************************************
10+
* *
11+
* This program is free software; you can redistribute it and/or modify *
12+
* it under the terms of the GNU General Public License as published by *
13+
* the Free Software Foundation; either version 2 of the License, or *
14+
* (at your option) any later version. *
15+
* *
16+
***************************************************************************/
17+
18+
#include "qgsalgorithmremoveduplicatenodes.h"
19+
20+
///@cond PRIVATE
21+
22+
QString QgsAlgorithmRemoveDuplicateNodes::name() const
23+
{
24+
return QStringLiteral( "removeduplicatenodes" );
25+
}
26+
27+
QString QgsAlgorithmRemoveDuplicateNodes::displayName() const
28+
{
29+
return QObject::tr( "Remove duplicate nodes" );
30+
}
31+
32+
QStringList QgsAlgorithmRemoveDuplicateNodes::tags() const
33+
{
34+
return QObject::tr( "points,valid,overlapping" ).split( ',' );
35+
}
36+
37+
QString QgsAlgorithmRemoveDuplicateNodes::group() const
38+
{
39+
return QObject::tr( "Vector geometry" );
40+
}
41+
42+
QString QgsAlgorithmRemoveDuplicateNodes::outputName() const
43+
{
44+
return QObject::tr( "Cleaned" );
45+
}
46+
47+
QString QgsAlgorithmRemoveDuplicateNodes::shortHelpString() const
48+
{
49+
return QObject::tr( "This algorithm removes duplicate nodes from features, wherever removing the nodes does "
50+
"not result in a degenerate geometry.\n\n"
51+
"The tolerance parameter specifies the tolerance for coordinates when determining whether "
52+
"vertices are identical.\n\n"
53+
"By default, z values are not considered when detecting duplicate nodes. E.g. two nodes "
54+
"with the same x and y coordinate but different z values will still be considered "
55+
"duplicate and one will be removed. If the Use Z Value parameter is true, then the z values are "
56+
"also tested and nodes with the same x and y but different z will be maintained.\n\n"
57+
"Note that duplicate nodes are not tested between different parts of a multipart geometry. E.g. "
58+
"a multipoint geometry with overlapping points will not be changed by this method." );
59+
}
60+
61+
QgsAlgorithmRemoveDuplicateNodes *QgsAlgorithmRemoveDuplicateNodes::createInstance() const
62+
{
63+
return new QgsAlgorithmRemoveDuplicateNodes();
64+
}
65+
66+
void QgsAlgorithmRemoveDuplicateNodes::initParameters( const QVariantMap & )
67+
{
68+
addParameter( new QgsProcessingParameterNumber( QStringLiteral( "TOLERANCE" ),
69+
QObject::tr( "Tolerance" ), QgsProcessingParameterNumber::Double,
70+
0.000001, false, 0, 10000000.0 ) );
71+
addParameter( new QgsProcessingParameterBoolean( QStringLiteral( "USE_Z_VALUE" ),
72+
QObject::tr( "Use Z Value" ), false ) );
73+
}
74+
75+
bool QgsAlgorithmRemoveDuplicateNodes::prepareAlgorithm( const QVariantMap &parameters, QgsProcessingContext &context, QgsProcessingFeedback * )
76+
{
77+
mTolerance = parameterAsDouble( parameters, QStringLiteral( "TOLERANCE" ), context );
78+
mUseZValues = parameterAsBool( parameters, QStringLiteral( "USE_Z_VALUE" ), context );
79+
return true;
80+
}
81+
82+
QgsFeature QgsAlgorithmRemoveDuplicateNodes::processFeature( const QgsFeature &feature, QgsProcessingContext &, QgsProcessingFeedback * )
83+
{
84+
QgsFeature f = feature;
85+
if ( f.hasGeometry() )
86+
{
87+
QgsGeometry geometry = f.geometry();
88+
geometry.removeDuplicateNodes( mTolerance, mUseZValues );
89+
f.setGeometry( geometry );
90+
}
91+
return f;
92+
}
93+
94+
///@endcond
95+
96+

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