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[FEATURE] Variable width buffers
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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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@nyalldawson
nyalldawson committed Apr 30, 2018
1 parent 2d3d6a8 commit 9ffae60
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Showing 24 changed files with 982 additions and 2 deletions.
53 changes: 53 additions & 0 deletions python/core/geometry/qgsgeometry.sip.in
View file
Expand Up @@ -894,6 +894,10 @@ Test for if geometry crosses another (uses GEOS)
%Docstring
Returns a buffer region around this geometry having the given width and with a specified number
of segments used to approximate curves

.. seealso:: :py:func:`singleSidedBuffer`

.. seealso:: :py:func:`taperedBuffer`
%End

QgsGeometry buffer( double distance, int segments, EndCapStyle endCapStyle, JoinStyle joinStyle, double miterLimit ) const;
Expand All @@ -907,6 +911,10 @@ Returns a buffer region around the geometry, with additional style options.
:param miterLimit: limit on the miter ratio used for very sharp corners (JoinStyleMiter only)

.. versionadded:: 2.4

.. seealso:: :py:func:`singleSidedBuffer`

.. seealso:: :py:func:`taperedBuffer`
%End

QgsGeometry offsetCurve( double distance, int segments, JoinStyle joinStyle, double miterLimit ) const;
Expand Down Expand Up @@ -938,6 +946,51 @@ applied to one side of the line.
calculated

.. versionadded:: 3.0

.. seealso:: :py:func:`buffer`

.. seealso:: :py:func:`taperedBuffer`
%End

QgsGeometry taperedBuffer( double startWidth, double endWidth, int segments ) const;
%Docstring
Calculates a variable width buffer ("tapered buffer") for a (multi)curve geometry.

The buffer begins at a width of ``startWidth`` at the start of each curve, and
ends at a width of ``endWidth``. Note that unlike buffer() methods, ``startWidth``
and ``endWidth`` are the diameter of the buffer at these points, not the radius.

The ``segments`` argument specifies the number of segments to approximate quarter-circle
curves in the buffer.

Non (multi)curve input geometries will return a null output geometry.

.. versionadded:: 3.2

.. seealso:: :py:func:`buffer`

.. seealso:: :py:func:`singleSidedBuffer`

.. seealso:: :py:func:`variableWidthBufferByM`
%End

QgsGeometry variableWidthBufferByM( int segments ) const;
%Docstring
Calculates a variable width buffer for a (multi)linestring geometry, where
the width at each node is taken from the linestring m values.

The ``segments`` argument specifies the number of segments to approximate quarter-circle
curves in the buffer.

Non (multi)linestring input geometries will return a null output geometry.

.. versionadded:: 3.2

.. seealso:: :py:func:`buffer`

.. seealso:: :py:func:`singleSidedBuffer`

.. seealso:: :py:func:`taperedBuffer`
%End

QgsGeometry extendLine( double startDistance, double endDistance ) const;
Expand Down
48 changes: 48 additions & 0 deletions python/plugins/processing/tests/testdata/expected/tapered_buffer_line.gml
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@@ -0,0 +1,48 @@
<?xml version="1.0" encoding="utf-8" ?>
<ogr:FeatureCollection
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://ogr.maptools.org/ tapered_buffer_line.xsd"
xmlns:ogr="http://ogr.maptools.org/"
xmlns:gml="http://www.opengis.net/gml">
<gml:boundedBy>
<gml:Box>
<gml:coord><gml:X>-1.2</gml:X><gml:Y>-3.4</gml:Y></gml:coord>
<gml:coord><gml:X>11.4</gml:X><gml:Y>5.4</gml:Y></gml:coord>
</gml:Box>
</gml:boundedBy>

<gml:featureMember>
<ogr:tapered_buffer_line fid="lines.0">
<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>
</ogr:tapered_buffer_line>
</gml:featureMember>
<gml:featureMember>
<ogr:tapered_buffer_line fid="lines.1">
<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>
</ogr:tapered_buffer_line>
</gml:featureMember>
<gml:featureMember>
<ogr:tapered_buffer_line fid="lines.2">
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</ogr:tapered_buffer_line>
</gml:featureMember>
<gml:featureMember>
<ogr:tapered_buffer_line fid="lines.3">
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</ogr:tapered_buffer_line>
</gml:featureMember>
<gml:featureMember>
<ogr:tapered_buffer_line fid="lines.4">
<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>
</ogr:tapered_buffer_line>
</gml:featureMember>
<gml:featureMember>
<ogr:tapered_buffer_line fid="lines.5">
<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>
</ogr:tapered_buffer_line>
</gml:featureMember>
<gml:featureMember>
<ogr:tapered_buffer_line fid="lines.6">
</ogr:tapered_buffer_line>
</gml:featureMember>
</ogr:FeatureCollection>
23 changes: 23 additions & 0 deletions python/plugins/processing/tests/testdata/expected/tapered_buffer_line.xsd
View file
@@ -0,0 +1,23 @@
<?xml version="1.0" encoding="UTF-8"?>
<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">
<xs:import namespace="http://www.opengis.net/gml" schemaLocation="http://schemas.opengis.net/gml/2.1.2/feature.xsd"/>
<xs:element name="FeatureCollection" type="ogr:FeatureCollectionType" substitutionGroup="gml:_FeatureCollection"/>
<xs:complexType name="FeatureCollectionType">
<xs:complexContent>
<xs:extension base="gml:AbstractFeatureCollectionType">
<xs:attribute name="lockId" type="xs:string" use="optional"/>
<xs:attribute name="scope" type="xs:string" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:element name="tapered_buffer_line" type="ogr:tapered_buffer_line_Type" substitutionGroup="gml:_Feature"/>
<xs:complexType name="tapered_buffer_line_Type">
<xs:complexContent>
<xs:extension base="gml:AbstractFeatureType">
<xs:sequence>
<xs:element name="geometryProperty" type="gml:MultiPolygonPropertyType" nillable="true" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:schema>
33 changes: 33 additions & 0 deletions python/plugins/processing/tests/testdata/expected/tapered_buffer_multiline.gml
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@@ -0,0 +1,33 @@
<?xml version="1.0" encoding="utf-8" ?>
<ogr:FeatureCollection
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://ogr.maptools.org/ tapered_buffer_multiline.xsd"
xmlns:ogr="http://ogr.maptools.org/"
xmlns:gml="http://www.opengis.net/gml">
<gml:boundedBy>
<gml:Box>
<gml:coord><gml:X>-1.2</gml:X><gml:Y>-1.4</gml:Y></gml:coord>
<gml:coord><gml:X>5.980422264875241</gml:X><gml:Y>4.519769673704415</gml:Y></gml:coord>
</gml:Box>
</gml:boundedBy>

<gml:featureMember>
<ogr:tapered_buffer_multiline fid="lines.1">
<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>
</ogr:tapered_buffer_multiline>
</gml:featureMember>
<gml:featureMember>
<ogr:tapered_buffer_multiline fid="lines.2">
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</ogr:tapered_buffer_multiline>
</gml:featureMember>
<gml:featureMember>
<ogr:tapered_buffer_multiline fid="lines.3">
</ogr:tapered_buffer_multiline>
</gml:featureMember>
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</ogr:tapered_buffer_multiline>
</gml:featureMember>
</ogr:FeatureCollection>
23 changes: 23 additions & 0 deletions python/plugins/processing/tests/testdata/expected/tapered_buffer_multiline.xsd
View file
@@ -0,0 +1,23 @@
<?xml version="1.0" encoding="UTF-8"?>
<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">
<xs:import namespace="http://www.opengis.net/gml" schemaLocation="http://schemas.opengis.net/gml/2.1.2/feature.xsd"/>
<xs:element name="FeatureCollection" type="ogr:FeatureCollectionType" substitutionGroup="gml:_FeatureCollection"/>
<xs:complexType name="FeatureCollectionType">
<xs:complexContent>
<xs:extension base="gml:AbstractFeatureCollectionType">
<xs:attribute name="lockId" type="xs:string" use="optional"/>
<xs:attribute name="scope" type="xs:string" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
<xs:element name="tapered_buffer_multiline" type="ogr:tapered_buffer_multiline_Type" substitutionGroup="gml:_Feature"/>
<xs:complexType name="tapered_buffer_multiline_Type">
<xs:complexContent>
<xs:extension base="gml:AbstractFeatureType">
<xs:sequence>
<xs:element name="geometryProperty" type="gml:MultiPolygonPropertyType" nillable="true" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:extension>
</xs:complexContent>
</xs:complexType>
</xs:schema>
48 changes: 48 additions & 0 deletions python/plugins/processing/tests/testdata/expected/variable_width_buffer_by_m.gml
View file
@@ -0,0 +1,48 @@
<?xml version="1.0" encoding="utf-8" ?>
<ogr:FeatureCollection
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://ogr.maptools.org/ variable_width_buffer_by_m.xsd"
xmlns:ogr="http://ogr.maptools.org/"
xmlns:gml="http://www.opengis.net/gml">
<gml:boundedBy>
<gml:Box>
<gml:coord><gml:X>-2</gml:X><gml:Y>-3.6</gml:Y></gml:coord>
<gml:coord><gml:X>11.4</gml:X><gml:Y>5.4</gml:Y></gml:coord>
</gml:Box>
</gml:boundedBy>

<gml:featureMember>
<ogr:variable_width_buffer_by_m fid="lines.0">
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</gml:featureMember>
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</ogr:variable_width_buffer_by_m>
</gml:featureMember>
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