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https://github.com/qgis/QGIS.git
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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.
This commit is contained in:
Nyall Dawson
parent
b80ad5e96e
commit
76c84f14d7
188
python/plugins/processing/tests/testdata/expected/create_parallel_lines.gml
vendored
Normal file
188
python/plugins/processing/tests/testdata/expected/create_parallel_lines.gml
vendored
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@ -0,0 +1,188 @@
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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>
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36
python/plugins/processing/tests/testdata/expected/create_parallel_lines.xsd
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36
python/plugins/processing/tests/testdata/expected/create_parallel_lines.xsd
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@ -0,0 +1,36 @@
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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>
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@ -5908,5 +5908,20 @@ tests:
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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
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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
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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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@ -69,7 +69,7 @@ void QgsArrayFeaturesAlgorithm::initParameters( const QVariantMap & )
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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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181
src/analysis/processing/qgsalgorithmparallellines.cpp
Normal file
181
src/analysis/processing/qgsalgorithmparallellines.cpp
Normal file
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/***************************************************************************
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qgsalgorithmparallellines.cpp
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||||
---------------------
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||||
begin : July 2018
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copyright : (C) 2018 by Nyall Dawson
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email : nyall dot dawson at gmail dot com
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||||
***************************************************************************/
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/***************************************************************************
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||||
* *
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* This program is free software; you can redistribute it and/or modify *
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||||
* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#include "qgsalgorithmparallellines.h"
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///@cond PRIVATE
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QString QgsCreateParallelLinesAlgorithm::name() const
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{
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return QStringLiteral( "parallellines" );
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}
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QString QgsCreateParallelLinesAlgorithm::displayName() const
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{
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return QObject::tr( "Create parallel lines" );
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}
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QStringList QgsCreateParallelLinesAlgorithm::tags() const
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{
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return QObject::tr( "offset,duplicate,create,spaced,copy,features,objects,step,repeat" ).split( ',' );
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||||
}
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||||
QString QgsCreateParallelLinesAlgorithm::group() const
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||||
{
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||||
return QObject::tr( "Vector creation" );
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}
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QString QgsCreateParallelLinesAlgorithm::groupId() const
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||||
{
|
||||
return QStringLiteral( "vectorcreation" );
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||||
}
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QString QgsCreateParallelLinesAlgorithm::outputName() const
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||||
{
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||||
return QObject::tr( "Parallel lines" );
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||||
}
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QString QgsCreateParallelLinesAlgorithm::shortHelpString() const
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||||
{
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||||
return QObject::tr( "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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||||
}
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QString QgsCreateParallelLinesAlgorithm::shortDescription() const
|
||||
{
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||||
return QObject::tr( "Creates multiple parallel copies of lines from a layer." );
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||||
}
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|
||||
QgsCreateParallelLinesAlgorithm *QgsCreateParallelLinesAlgorithm::createInstance() const
|
||||
{
|
||||
return new QgsCreateParallelLinesAlgorithm();
|
||||
}
|
||||
|
||||
void QgsCreateParallelLinesAlgorithm::initParameters( const QVariantMap & )
|
||||
{
|
||||
std::unique_ptr< QgsProcessingParameterNumber > count = qgis::make_unique< QgsProcessingParameterNumber >( QStringLiteral( "COUNT" ),
|
||||
QObject::tr( "Number of features to create" ), QgsProcessingParameterNumber::Integer,
|
||||
10, false, 1 );
|
||||
count->setIsDynamic( true );
|
||||
count->setDynamicPropertyDefinition( QgsPropertyDefinition( QStringLiteral( "COUNT" ), QObject::tr( "Number of features to create" ), QgsPropertyDefinition::IntegerPositiveGreaterZero ) );
|
||||
count->setDynamicLayerParameterName( QStringLiteral( "INPUT" ) );
|
||||
addParameter( count.release() );
|
||||
|
||||
std::unique_ptr< QgsProcessingParameterDistance > offset = qgis::make_unique< QgsProcessingParameterDistance >( QStringLiteral( "OFFSET" ),
|
||||
QObject::tr( "Offset step distance" ),
|
||||
1.0, QStringLiteral( "INPUT" ) );
|
||||
offset->setIsDynamic( true );
|
||||
offset->setDynamicPropertyDefinition( QgsPropertyDefinition( QStringLiteral( "OFFSET" ), QObject::tr( "Step distance" ), QgsPropertyDefinition::Double ) );
|
||||
offset->setDynamicLayerParameterName( QStringLiteral( "INPUT" ) );
|
||||
addParameter( offset.release() );
|
||||
|
||||
auto segmentParam = qgis::make_unique< QgsProcessingParameterNumber >( QStringLiteral( "SEGMENTS" ), QObject::tr( "Segments" ), QgsProcessingParameterNumber::Integer, 8, false, 1 );
|
||||
segmentParam->setFlags( segmentParam->flags() | QgsProcessingParameterDefinition::FlagAdvanced );
|
||||
addParameter( segmentParam.release() );
|
||||
|
||||
auto joinStyleParam = qgis::make_unique< QgsProcessingParameterEnum>( QStringLiteral( "JOIN_STYLE" ), QObject::tr( "Join style" ), QStringList() << QObject::tr( "Round" ) << QObject::tr( "Miter" ) << QObject::tr( "Bevel" ), false, 0 );
|
||||
joinStyleParam->setFlags( joinStyleParam->flags() | QgsProcessingParameterDefinition::FlagAdvanced );
|
||||
addParameter( joinStyleParam.release() );
|
||||
|
||||
auto miterLimitParam = qgis::make_unique< QgsProcessingParameterNumber >( QStringLiteral( "MITER_LIMIT" ), QObject::tr( "Miter limit" ), QgsProcessingParameterNumber::Double, 2, false, 1 );
|
||||
miterLimitParam->setFlags( miterLimitParam->flags() | QgsProcessingParameterDefinition::FlagAdvanced );
|
||||
addParameter( miterLimitParam.release() );
|
||||
}
|
||||
|
||||
QList<int> QgsCreateParallelLinesAlgorithm::inputLayerTypes() const
|
||||
{
|
||||
return QList< int >() << QgsProcessing::TypeVectorLine;
|
||||
}
|
||||
|
||||
bool QgsCreateParallelLinesAlgorithm::prepareAlgorithm( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback * )
|
||||
{
|
||||
mCount = parameterAsInt( parameters, QStringLiteral( "COUNT" ), context );
|
||||
mDynamicCount = QgsProcessingParameters::isDynamic( parameters, QStringLiteral( "COUNT" ) );
|
||||
if ( mDynamicCount )
|
||||
mCountProperty = parameters.value( QStringLiteral( "COUNT" ) ).value< QgsProperty >();
|
||||
|
||||
mOffsetStep = parameterAsDouble( parameters, QStringLiteral( "OFFSET" ), context );
|
||||
mDynamicOffset = QgsProcessingParameters::isDynamic( parameters, QStringLiteral( "OFFSET" ) );
|
||||
if ( mDynamicOffset )
|
||||
mOffsetStepProperty = parameters.value( QStringLiteral( "OFFSET" ) ).value< QgsProperty >();
|
||||
|
||||
mSegments = parameterAsInt( parameters, QStringLiteral( "SEGMENTS" ), context );
|
||||
mJoinStyle = static_cast< QgsGeometry::JoinStyle>( 1 + parameterAsInt( parameters, QStringLiteral( "JOIN_STYLE" ), context ) );
|
||||
mMiterLimit = parameterAsDouble( parameters, QStringLiteral( "MITER_LIMIT" ), context );
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
QgsFeatureList QgsCreateParallelLinesAlgorithm::processFeature( const QgsFeature &feature, QgsProcessingContext &context, QgsProcessingFeedback * )
|
||||
{
|
||||
QgsFeatureList result = QgsFeatureList();
|
||||
|
||||
if ( feature.hasGeometry() )
|
||||
{
|
||||
const QgsGeometry geometry = feature.geometry();
|
||||
const QgsAttributes attr = feature.attributes();
|
||||
|
||||
int count = mCount;
|
||||
if ( mDynamicCount )
|
||||
count = mCountProperty.valueAsInt( context.expressionContext(), count );
|
||||
result.reserve( count + 1 );
|
||||
|
||||
double offsetStep = mOffsetStep;
|
||||
if ( mDynamicOffset )
|
||||
offsetStep = mOffsetStepProperty.valueAsDouble( context.expressionContext(), offsetStep );
|
||||
|
||||
{
|
||||
QgsFeature original = feature;
|
||||
original.setGeometry( geometry );
|
||||
QgsAttributes outAttrs = attr;
|
||||
outAttrs << QVariant( 0 ) << QVariant( 0 );
|
||||
original.setAttributes( outAttrs );
|
||||
result << original;
|
||||
}
|
||||
|
||||
double offset = 0;
|
||||
for ( int i = 0; i < count; ++i )
|
||||
{
|
||||
offset += offsetStep;
|
||||
QgsFeature offsetFeature = feature;
|
||||
const QgsGeometry offsetGeometry = geometry.offsetCurve( offset, mSegments, mJoinStyle, mMiterLimit );
|
||||
offsetFeature.setGeometry( offsetGeometry );
|
||||
QgsAttributes outAttrs = attr;
|
||||
outAttrs << QVariant( i + 1 ) << QVariant( offset );
|
||||
offsetFeature.setAttributes( outAttrs );
|
||||
result << offsetFeature;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
result << feature;
|
||||
}
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
QgsFields QgsCreateParallelLinesAlgorithm::outputFields( const QgsFields &inputFields ) const
|
||||
{
|
||||
QgsFields output = inputFields;
|
||||
output.append( QgsField( QStringLiteral( "instance" ), QVariant::Int ) );
|
||||
output.append( QgsField( QStringLiteral( "offset" ), QVariant::Double ) );
|
||||
return output;
|
||||
}
|
||||
|
||||
///@endcond
|
||||
|
||||
|
||||
76
src/analysis/processing/qgsalgorithmparallellines.h
Normal file
76
src/analysis/processing/qgsalgorithmparallellines.h
Normal file
@ -0,0 +1,76 @@
|
||||
/***************************************************************************
|
||||
qgsalgorithmparallellines.h
|
||||
---------------------
|
||||
begin : July 2018
|
||||
copyright : (C) 2018 by Nyall Dawson
|
||||
email : nyall dot dawson at gmail dot com
|
||||
***************************************************************************/
|
||||
|
||||
/***************************************************************************
|
||||
* *
|
||||
* This program is free software; you can redistribute it and/or modify *
|
||||
* it under the terms of the GNU General Public License as published by *
|
||||
* the Free Software Foundation; either version 2 of the License, or *
|
||||
* (at your option) any later version. *
|
||||
* *
|
||||
***************************************************************************/
|
||||
|
||||
#ifndef QGSALGORITHMPARALLELLINES_H
|
||||
#define QGSALGORITHMPARALLELLINES_H
|
||||
|
||||
#define SIP_NO_FILE
|
||||
|
||||
#include "qgis.h"
|
||||
#include "qgsprocessingalgorithm.h"
|
||||
|
||||
///@cond PRIVATE
|
||||
|
||||
/**
|
||||
* Native create parallel lines algorithm.
|
||||
*/
|
||||
class QgsCreateParallelLinesAlgorithm : public QgsProcessingFeatureBasedAlgorithm
|
||||
{
|
||||
|
||||
public:
|
||||
|
||||
QgsCreateParallelLinesAlgorithm() = default;
|
||||
QString name() const override;
|
||||
QString displayName() const override;
|
||||
QStringList tags() const override;
|
||||
QString group() const override;
|
||||
QString groupId() const override;
|
||||
QString shortHelpString() const override;
|
||||
QString shortDescription() const override;
|
||||
QgsCreateParallelLinesAlgorithm *createInstance() const override SIP_FACTORY;
|
||||
void initParameters( const QVariantMap &configuration = QVariantMap() ) override;
|
||||
QList<int> inputLayerTypes() const override;
|
||||
|
||||
protected:
|
||||
QString outputName() const override;
|
||||
bool prepareAlgorithm( const QVariantMap ¶meters, QgsProcessingContext &context, QgsProcessingFeedback *feedback ) override;
|
||||
QgsFeatureList processFeature( const QgsFeature &feature, QgsProcessingContext &context, QgsProcessingFeedback *feedback ) override;
|
||||
QgsFields outputFields( const QgsFields &inputFields ) const override;
|
||||
|
||||
private:
|
||||
|
||||
int mCount = 0;
|
||||
bool mDynamicCount = false;
|
||||
QgsProperty mCountProperty;
|
||||
|
||||
double mOffsetStep = 0.0;
|
||||
bool mDynamicOffset = false;
|
||||
QgsProperty mOffsetStepProperty;
|
||||
|
||||
int mSegments = 8;
|
||||
QgsGeometry::JoinStyle mJoinStyle = QgsGeometry::JoinStyleRound;
|
||||
double mMiterLimit = 2;
|
||||
|
||||
|
||||
};
|
||||
|
||||
|
||||
///@endcond PRIVATE
|
||||
|
||||
#endif // QGSALGORITHMPARALLELLINES_H
|
||||
|
||||
|
||||
@ -58,6 +58,7 @@
|
||||
#include "qgsalgorithmorderbyexpression.h"
|
||||
#include "qgsalgorithmorientedminimumboundingbox.h"
|
||||
#include "qgsalgorithmpackage.h"
|
||||
#include "qgsalgorithmparallellines.h"
|
||||
#include "qgsalgorithmpointonsurface.h"
|
||||
#include "qgsalgorithmprojectpointcartesian.h"
|
||||
#include "qgsalgorithmpromotetomultipart.h"
|
||||
@ -173,6 +174,7 @@ void QgsNativeAlgorithms::loadAlgorithms()
|
||||
addAlgorithm( new QgsOrderByExpressionAlgorithm() );
|
||||
addAlgorithm( new QgsOrientedMinimumBoundingBoxAlgorithm() );
|
||||
addAlgorithm( new QgsPackageAlgorithm() );
|
||||
addAlgorithm( new QgsCreateParallelLinesAlgorithm() );
|
||||
addAlgorithm( new QgsPointOnSurfaceAlgorithm() );
|
||||
addAlgorithm( new QgsProjectPointCartesianAlgorithm() );
|
||||
addAlgorithm( new QgsPromoteToMultipartAlgorithm() );
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user