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Merge pull request #7626 from rudivs/kneighbour
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[feature] Adapted k-neighbour concave hull plugin as QGIS 3 algorithm
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luipir committed Sep 14, 2018
2 parents 1192b63 + 8fa27e1 commit 8b07b4e
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1 change: 1 addition & 0 deletions images/images.qrc
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134 changes: 134 additions & 0 deletions images/themes/default/algorithms/mAlgorithmConcaveHull.svg
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7 changes: 7 additions & 0 deletions python/plugins/processing/algs/help/qgis.yaml
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Expand Up @@ -233,6 +233,13 @@ qgis:joinbylocationsummary: >
qgis:keepnbiggestparts: >
This algorithm takes a polygon layer and creates a new polygon layer in which multipart geometries have been removed, leaving only the n largest (in terms of area) parts.

qgis:knearestconcavehull: >
This algorithm generates a concave hull polygon from a set of points. If the input layer is a line or polygon layer, it will use the nodes.

The number of neighbours to consider determines the concaveness of the output polygon. A lower number will result in a concave hull that follows the points very closely, while a higher number will have a smoother shape. The minimum number of neighbour points to consider is 3. A value equal to or greater than the number of points will result in a convex hull.

If a field is selected, the algorithm will group the features in the input layer using unique values in that field and generate individual polygons in the output layer for each group.

qgis:lineintersections: >
This algorithm creates point features where the lines in the Intersect layer intersect the lines in the Input layer.

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14 changes: 12 additions & 2 deletions python/plugins/processing/algs/qgis/
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from qgis.PyQt.QtCore import QCoreApplication
from math import sqrt

from qgis.core import (QgsFeature,
from qgis.core import (QgsApplication,
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return 'concavehull'

def displayName(self):
return'Concave hull')
return'Concave hull (alpha shapes)')

def shortDescription(self):
return'Creates a concave hull using the alpha shapes algorithm.')

def icon(self):
return QgsApplication.getThemeIcon("/algorithms/mAlgorithmConcaveHull.svg")

def svgIconPath(self):
return QgsApplication.iconPath("/algorithms/mAlgorithmConcaveHull.svg")

def processAlgorithm(self, parameters, context, feedback):
layer = self.parameterAsSource(parameters, ConcaveHull.INPUT, context)
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