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[FEATURE][processing] "Create parallel lines" algorithm
This algorithm creates copies of line features in a layer, by creating multiple parallel versions of each feature. Each copy is offset by a preset distance.
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‎python/plugins/processing/tests/testdata/expected/create_parallel_lines.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/ create_parallel_lines.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</gml:X><gml:Y>-3.6</gml:Y></gml:coord>
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<gml:coord><gml:X>11.42426406871193</gml:X><gml:Y>5</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:create_parallel_lines fid="lines.0">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>6,2 9,2 9,3 11,5</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>0</ogr:instance>
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<ogr:offset>0</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.0">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>11.1414213562373,4.85857864376269 9.2,2.91715728752538 9.2,1.8 6.0,1.8</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>1</ogr:instance>
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<ogr:offset>-0.2</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.0">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>11.2828427124746,4.71715728752538 9.4,2.83431457505076 9.4,1.6 6.0,1.6</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>2</ogr:instance>
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<ogr:offset>-0.4</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.0">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>11.4242640687119,4.57573593128807 9.6,2.75147186257614 9.6,1.4 6.0,1.4</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>3</ogr:instance>
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<ogr:offset>-0.6</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.1">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>-1,-1 1,-1</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>0</ogr:instance>
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<ogr:offset>0</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.1">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>1.0,-1.2 -1.0,-1.2</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>1</ogr:instance>
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<ogr:offset>-0.2</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.1">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>1.0,-1.4 -1.0,-1.4</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>2</ogr:instance>
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<ogr:offset>-0.4</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.1">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>1.0,-1.6 -1.0,-1.6</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>3</ogr:instance>
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<ogr:offset>-0.6</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines 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:instance>0</ogr:instance>
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<ogr:offset>0</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.2">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>3.2,3.0 3.2,1.8 2.8,1.8 2.2,1.8 2.2,0.0</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>1</ogr:instance>
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<ogr:offset>-0.2</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.2">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>3.4,3.0 3.4,1.6 2.93333333333333,1.6 2.4,1.6 2.4,0.0</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>2</ogr:instance>
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<ogr:offset>-0.4</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.2">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>3.6,3.0 3.6,1.4 3.06666666666667,1.4 2.6,1.4 2.6,0.0</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>3</ogr:instance>
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<ogr:offset>-0.6</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.3">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>3,1 5,1</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>0</ogr:instance>
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<ogr:offset>0</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.3">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>5.0,0.8 3.0,0.8</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>1</ogr:instance>
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<ogr:offset>-0.2</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.3">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>5.0,0.6 3.0,0.6</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>2</ogr:instance>
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<ogr:offset>-0.4</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.3">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>5.0,0.4 3.0,0.4</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>3</ogr:instance>
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<ogr:offset>-0.6</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.4">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>7,-3 10,-3</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>0</ogr:instance>
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<ogr:offset>0</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.4">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>10.0,-3.2 7.0,-3.2</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>1</ogr:instance>
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<ogr:offset>-0.2</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.4">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>10.0,-3.4 7.0,-3.4</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>2</ogr:instance>
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<ogr:offset>-0.4</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.4">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>10.0,-3.6 7.0,-3.6</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>3</ogr:instance>
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<ogr:offset>-0.6</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.5">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>6,-3 10,1</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>0</ogr:instance>
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<ogr:offset>0</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.5">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>10.1414213562373,0.858578643762691 6.14142135623731,-3.14142135623731</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>1</ogr:instance>
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<ogr:offset>-0.2</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.5">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>10.2828427124746,0.717157287525381 6.28284271247462,-3.28284271247462</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>2</ogr:instance>
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<ogr:offset>-0.4</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.5">
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<ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>10.4242640687119,0.575735931288071 6.42426406871193,-3.42426406871193</gml:coordinates></gml:LineString></ogr:geometryProperty>
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<ogr:instance>3</ogr:instance>
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<ogr:offset>-0.6</ogr:offset>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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<gml:featureMember>
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<ogr:create_parallel_lines fid="lines.6">
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<ogr:instance xsi:nil="true"/>
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<ogr:offset xsi:nil="true"/>
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</ogr:create_parallel_lines>
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</gml:featureMember>
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</ogr:FeatureCollection>

‎python/plugins/processing/tests/testdata/expected/create_parallel_lines.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="create_parallel_lines" type="ogr:create_parallel_lines_Type" substitutionGroup="gml:_Feature"/>
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<xs:complexType name="create_parallel_lines_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:element name="instance" nillable="true" minOccurs="0" maxOccurs="1">
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<xs:simpleType>
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<xs:restriction base="xs:integer">
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<xs:totalDigits value="10"/>
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</xs:restriction>
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</xs:simpleType>
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</xs:element>
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<xs:element name="offset" nillable="true" minOccurs="0" maxOccurs="1">
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<xs:simpleType>
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<xs:restriction base="xs:decimal">
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</xs:restriction>
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</xs:simpleType>
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</xs:element>
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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/qgis_algorithm_tests.yaml

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name: expected/feature_array.shp
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type: vector
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- algorithm: native:parallellines
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name: Create parallel lines
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params:
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COUNT: 3
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INPUT:
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name: lines.gml
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type: vector
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JOIN_STYLE: 1
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MITER_LIMIT: 2.0
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OFFSET: -0.2
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SEGMENTS: 8
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results:
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OUTPUT:
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name: expected/create_parallel_lines.gml
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type: vector
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# See ../README.md for a description of the file format

‎src/analysis/CMakeLists.txt

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@@ -61,6 +61,7 @@ SET(QGIS_ANALYSIS_SRCS
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processing/qgsalgorithmorderbyexpression.cpp
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processing/qgsalgorithmorientedminimumboundingbox.cpp
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processing/qgsalgorithmpackage.cpp
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processing/qgsalgorithmparallellines.cpp
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processing/qgsalgorithmpointonsurface.cpp
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processing/qgsalgorithmprojectpointcartesian.cpp
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processing/qgsalgorithmpromotetomultipart.cpp

‎src/analysis/processing/qgsalgorithmarrayfeatures.cpp

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@@ -36,12 +36,12 @@ QStringList QgsArrayFeaturesAlgorithm::tags() const
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QString QgsArrayFeaturesAlgorithm::group() const
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{
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return QObject::tr( "Vector geometry" );
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return QObject::tr( "Vector creation" );
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}
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QString QgsArrayFeaturesAlgorithm::groupId() const
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{
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return QStringLiteral( "vectorgeometry" );
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return QStringLiteral( "vectorcreation" );
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}
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QString QgsArrayFeaturesAlgorithm::outputName() const
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{
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std::unique_ptr< QgsProcessingParameterNumber > count = qgis::make_unique< QgsProcessingParameterNumber >( QStringLiteral( "COUNT" ),
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QObject::tr( "Number of features to create" ), QgsProcessingParameterNumber::Integer,
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10, true, 1 );
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10, false, 1 );
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count->setIsDynamic( true );
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count->setDynamicPropertyDefinition( QgsPropertyDefinition( QStringLiteral( "COUNT" ), QObject::tr( "Number of features to create" ), QgsPropertyDefinition::IntegerPositiveGreaterZero ) );
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count->setDynamicLayerParameterName( QStringLiteral( "INPUT" ) );

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