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[FEATURE] Variable width buffers
Adds geometry methods to create variable width buffers, including tapered buffers (with a specified start and end diameter) and variable width buffers from line string m values. Also adds processing algorithms which expose these methods to processing.
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‎python/core/geometry/qgsgeometry.sip.in

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@@ -894,6 +894,10 @@ Test for if geometry crosses another (uses GEOS)
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%Docstring
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Returns a buffer region around this geometry having the given width and with a specified number
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of segments used to approximate curves
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.. seealso:: :py:func:`singleSidedBuffer`
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.. seealso:: :py:func:`taperedBuffer`
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%End
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QgsGeometry buffer( double distance, int segments, EndCapStyle endCapStyle, JoinStyle joinStyle, double miterLimit ) const;
@@ -907,6 +911,10 @@ Returns a buffer region around the geometry, with additional style options.
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:param miterLimit: limit on the miter ratio used for very sharp corners (JoinStyleMiter only)
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.. versionadded:: 2.4
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.. seealso:: :py:func:`singleSidedBuffer`
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.. seealso:: :py:func:`taperedBuffer`
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%End
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QgsGeometry offsetCurve( double distance, int segments, JoinStyle joinStyle, double miterLimit ) const;
@@ -938,6 +946,51 @@ applied to one side of the line.
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calculated
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.. versionadded:: 3.0
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.. seealso:: :py:func:`buffer`
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.. seealso:: :py:func:`taperedBuffer`
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%End
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QgsGeometry taperedBuffer( double startWidth, double endWidth, int segments ) const;
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%Docstring
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Calculates a variable width buffer ("tapered buffer") for a (multi)curve geometry.
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The buffer begins at a width of ``startWidth`` at the start of each curve, and
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ends at a width of ``endWidth``. Note that unlike buffer() methods, ``startWidth``
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and ``endWidth`` are the diameter of the buffer at these points, not the radius.
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The ``segments`` argument specifies the number of segments to approximate quarter-circle
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curves in the buffer.
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Non (multi)curve input geometries will return a null output geometry.
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.. versionadded:: 3.2
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.. seealso:: :py:func:`buffer`
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.. seealso:: :py:func:`singleSidedBuffer`
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.. seealso:: :py:func:`variableWidthBufferByM`
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%End
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QgsGeometry variableWidthBufferByM( int segments ) const;
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%Docstring
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Calculates a variable width buffer for a (multi)linestring geometry, where
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the width at each node is taken from the linestring m values.
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The ``segments`` argument specifies the number of segments to approximate quarter-circle
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curves in the buffer.
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Non (multi)linestring input geometries will return a null output geometry.
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.. versionadded:: 3.2
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.. seealso:: :py:func:`buffer`
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.. seealso:: :py:func:`singleSidedBuffer`
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.. seealso:: :py:func:`taperedBuffer`
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%End
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QgsGeometry extendLine( double startDistance, double endDistance ) const;

‎python/plugins/processing/tests/testdata/expected/tapered_buffer_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"
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xsi:schemaLocation="http://ogr.maptools.org/ tapered_buffer_line.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>-1.2</gml:X><gml:Y>-3.4</gml:Y></gml:coord>
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<gml:coord><gml:X>11.4</gml:X><gml:Y>5.4</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:tapered_buffer_line fid="lines.0">
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<ogr:geometryProperty><gml:MultiPolygon srsName="EPSG:4326"><gml:polygonMember><gml:Polygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>6.0,1.8 5.9,1.82679491924311 5.82679491924311,1.9 5.8,2.0 5.82679491924311,2.1 5.9,2.17320508075689 6.0,2.2 8.7039545437016,2.279196994983 8.68284271247462,3.0 8.72533373200766,3.15857864376269 10.6535898384862,5.2 10.8,5.34641016151378 11.0,5.4 11.2,5.34641016151378 11.3464101615138,5.2 11.4,5.0 11.3464101615138,4.8 11.2,4.65358983848622 9.3133956158887,2.87156849680836 9.28786796564404,2.0 9.24930097118348,1.85606601717798 9.14393398282202,1.75069902881652 9.0,1.71213203435596 6.0,1.8</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></gml:polygonMember></gml:MultiPolygon></ogr:geometryProperty>
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</ogr:tapered_buffer_line>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:tapered_buffer_line fid="lines.1">
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<ogr:geometryProperty><gml:MultiPolygon srsName="EPSG:4326"><gml:polygonMember><gml:Polygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>-1.0,-1.2 -1.1,-1.17320508075689 -1.17320508075689,-1.1 -1.2,-1.0 -1.17320508075689,-0.9 -1.1,-0.826794919243112 -1.0,-0.8 1.0,-0.6 1.2,-0.653589838486225 1.34641016151378,-0.8 1.4,-1.0 1.34641016151378,-1.2 1.2,-1.34641016151378 1.0,-1.4 -1.0,-1.2</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></gml:polygonMember></gml:MultiPolygon></ogr:geometryProperty>
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</ogr:tapered_buffer_line>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:tapered_buffer_line fid="lines.2">
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<ogr:geometryProperty><gml:MultiPolygon srsName="EPSG:4326"><gml:polygonMember><gml:Polygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>3.35,2.0 3.30310889132455,1.825 3.175,1.69689110867545 3.0,1.65 2.28428927680798,1.6857855361596 2.2,-0.0 2.17320508075689,-0.1 2.1,-0.173205080756888 2.0,-0.2 1.9,-0.173205080756888 1.82679491924311,-0.1 1.8,0.0 1.7,2.0 1.74019237886467,2.15 1.85,2.25980762113533 2.0,2.3 2.63341645885287,2.33167082294264 2.6,3.0 2.65358983848622,3.2 2.8,3.34641016151378 3.0,3.4 3.2,3.34641016151378 3.34641016151378,3.2 3.4,3.0 3.35,2.0</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></gml:polygonMember></gml:MultiPolygon></ogr:geometryProperty>
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</ogr:tapered_buffer_line>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:tapered_buffer_line fid="lines.3">
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<ogr:geometryProperty><gml:MultiPolygon srsName="EPSG:4326"><gml:polygonMember><gml:Polygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>3.0,0.8 2.9,0.826794919243112 2.82679491924311,0.9 2.8,1.0 2.82679491924311,1.1 2.9,1.17320508075689 3.0,1.2 5.0,1.4 5.2,1.34641016151378 5.34641016151378,1.2 5.4,1.0 5.34641016151378,0.8 5.2,0.653589838486225 5.0,0.6 3.0,0.8</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></gml:polygonMember></gml:MultiPolygon></ogr:geometryProperty>
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</ogr:tapered_buffer_line>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:tapered_buffer_line fid="lines.4">
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<ogr:geometryProperty><gml:MultiPolygon srsName="EPSG:4326"><gml:polygonMember><gml:Polygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>7.0,-3.2 6.9,-3.17320508075689 6.82679491924311,-3.1 6.8,-3.0 6.82679491924311,-2.9 6.9,-2.82679491924311 7.0,-2.8 10.0,-2.6 10.2,-2.65358983848622 10.3464101615138,-2.8 10.4,-3.0 10.3464101615138,-3.2 10.2,-3.34641016151378 10.0,-3.4 7.0,-3.2</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></gml:polygonMember></gml:MultiPolygon></ogr:geometryProperty>
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</ogr:tapered_buffer_line>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:tapered_buffer_line fid="lines.5">
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<ogr:geometryProperty><gml:MultiPolygon srsName="EPSG:4326"><gml:polygonMember><gml:Polygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>6.1,-3.17320508075689 6.0,-3.2 5.9,-3.17320508075689 5.82679491924311,-3.1 5.8,-3.0 5.82679491924311,-2.9 9.65358983848622,1.2 9.8,1.34641016151378 10.0,1.4 10.2,1.34641016151378 10.3464101615138,1.2 10.4,1.0 10.3464101615138,0.8 10.2,0.653589838486225 6.1,-3.17320508075689</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></gml:polygonMember></gml:MultiPolygon></ogr:geometryProperty>
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</ogr:tapered_buffer_line>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:tapered_buffer_line fid="lines.6">
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</ogr:tapered_buffer_line>
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</gml:featureMember>
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</ogr:FeatureCollection>

‎python/plugins/processing/tests/testdata/expected/tapered_buffer_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">
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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"/>
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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="tapered_buffer_line" type="ogr:tapered_buffer_line_Type" substitutionGroup="gml:_Feature"/>
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<xs:complexType name="tapered_buffer_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:MultiPolygonPropertyType" 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/tapered_buffer_multiline.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"
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xsi:schemaLocation="http://ogr.maptools.org/ tapered_buffer_multiline.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>-1.2</gml:X><gml:Y>-1.4</gml:Y></gml:coord>
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<gml:coord><gml:X>5.980422264875241</gml:X><gml:Y>4.519769673704415</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:tapered_buffer_multiline fid="lines.1">
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<ogr:geometryProperty><gml:MultiPolygon srsName="EPSG:4326"><gml:polygonMember><gml:Polygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>-1.0,-1.2 -1.1,-1.17320508075689 -1.17320508075689,-1.1 -1.2,-1.0 -1.17320508075689,-0.9 -1.1,-0.826794919243112 -1.0,-0.8 1.0,-0.6 1.2,-0.653589838486225 1.34641016151378,-0.8 1.4,-1.0 1.34641016151378,-1.2 1.2,-1.34641016151378 1.0,-1.4 -1.0,-1.2</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></gml:polygonMember></gml:MultiPolygon></ogr:geometryProperty>
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</ogr:tapered_buffer_multiline>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:tapered_buffer_multiline fid="lines.2">
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<ogr:geometryProperty><gml:MultiPolygon srsName="EPSG:4326"><gml:polygonMember><gml:Polygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>3.0,0.8 2.9,0.826794919243112 2.82679491924311,0.9 2.8,1.0 2.82679491924311,1.1 2.9,1.17320508075689 3.0,1.2 5.0,1.4 5.2,1.34641016151378 5.34641016151378,1.2 5.4,1.0 5.34641016151378,0.8 5.2,0.653589838486225 5.0,0.6 3.0,0.8</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></gml:polygonMember><gml:polygonMember><gml:Polygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>5.4,1.0 5.34641016151378,0.8 5.2,0.653589838486225 5.0,0.6 4.8,0.653589838486224 4.65358983848622,0.8 4.6,1.0 4.82418426103647,2.4147792706334 4.85097918027958,2.5147792706334 4.92418426103647,2.58798435139029 5.02418426103647,2.6147792706334 5.12418426103647,2.58798435139029 5.19738934179336,2.5147792706334 5.22418426103647,2.4147792706334 5.4,1.0</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></gml:polygonMember></gml:MultiPolygon></ogr:geometryProperty>
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</ogr:tapered_buffer_multiline>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:tapered_buffer_multiline fid="lines.3">
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</ogr:tapered_buffer_multiline>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:tapered_buffer_multiline fid="lines.4">
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<ogr:geometryProperty><gml:MultiPolygon srsName="EPSG:4326"><gml:polygonMember><gml:Polygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>3.35,2.0 3.30310889132455,1.825 3.175,1.69689110867545 3.0,1.65 2.28428927680798,1.6857855361596 2.2,-0.0 2.17320508075689,-0.1 2.1,-0.173205080756888 2.0,-0.2 1.9,-0.173205080756888 1.82679491924311,-0.1 1.8,0.0 1.7,2.0 1.74019237886467,2.15 1.85,2.25980762113533 2.0,2.3 2.63341645885287,2.33167082294264 2.6,3.0 2.65358983848622,3.2 2.8,3.34641016151378 3.0,3.4 3.2,3.34641016151378 3.34641016151378,3.2 3.4,3.0 3.35,2.0</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></gml:polygonMember><gml:polygonMember><gml:Polygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>2.94433781190019,3.84721689059501 2.84433781190019,3.87401180983812 2.7711327311433,3.94721689059501 2.74433781190019,4.04721689059501 2.7711327311433,4.14721689059501 2.84433781190019,4.2204219713519 2.94433781190019,4.24721689059501 5.4595009596929,4.51976967370442 5.6595009596929,4.46617983521819 5.80591112120667,4.31976967370441 5.8595009596929,4.11976967370441 5.80591112120667,3.91976967370441 5.6595009596929,3.77335951219064 5.4595009596929,3.71976967370441 2.94433781190019,3.84721689059501</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></gml:polygonMember><gml:polygonMember><gml:Polygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>5.58042226487524,3.3468330134357 5.78042226487524,3.29324317494948 5.92683242638902,3.1468330134357 5.98042226487524,2.9468330134357 5.92683242638902,2.7468330134357 5.78042226487524,2.60042285192193 5.58042226487524,2.5468330134357 3.0,2.8 2.9,2.82679491924311 2.82679491924311,2.9 2.8,3.0 2.82679491924311,3.1 2.9,3.17320508075689 3.0,3.2 5.58042226487524,3.3468330134357</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></gml:polygonMember></gml:MultiPolygon></ogr:geometryProperty>
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</ogr:tapered_buffer_multiline>
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</gml:featureMember>
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</ogr:FeatureCollection>

‎python/plugins/processing/tests/testdata/expected/tapered_buffer_multiline.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"/>
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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="tapered_buffer_multiline" type="ogr:tapered_buffer_multiline_Type" substitutionGroup="gml:_Feature"/>
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<xs:complexType name="tapered_buffer_multiline_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:MultiPolygonPropertyType" 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/variable_width_buffer_by_m.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"
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xsi:schemaLocation="http://ogr.maptools.org/ variable_width_buffer_by_m.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>-3.6</gml:Y></gml:coord>
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<gml:coord><gml:X>11.4</gml:X><gml:Y>5.4</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:variable_width_buffer_by_m fid="lines.0">
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<ogr:geometryProperty><gml:MultiPolygon srsName="EPSG:4326"><gml:polygonMember><gml:Polygon><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>6.0,1.9 5.95,1.91339745962156 5.91339745962156,1.95 5.9,2.0 5.91339745962156,2.05 5.95,2.08660254037844 6.0,2.1 8.78073089700997,2.19269102990033 8.7,3.0 8.74019237886467,3.15 10.6535898384862,5.2 10.8,5.34641016151378 11.0,5.4 11.2,5.34641016151378 11.3464101615138,5.2 11.4,5.0 11.3464101615138,4.8 11.2,4.65358983848622 9.28678639606939,2.86786396069392 9.2,2.0 9.17320508075689,1.9 9.1,1.82679491924311 9.0,1.8 6.0,1.9</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></gml:polygonMember></gml:MultiPolygon></ogr:geometryProperty>
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</ogr:variable_width_buffer_by_m>
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</gml:featureMember>
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<gml:featureMember>
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