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[needs-docs][processing] add help and clarity to the define current p…

…rojection algorithm
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nirvn committed May 1, 2018
1 parent 3228654 commit 39c6e23c08b4c993e0baf2787b565e85456bc26c
@@ -550,3 +550,9 @@ qgis:voronoipolygons: >

qgis:zonalstatistics:


qgis:definecurrentprojection: >
This algorithm sets an existing layer's projection to the provided CRS. Contrary to the "Assign projection" algorithm, it will not output a new layer.

For shapefile datasets, the .prj and .qpj files will be overwritten - or created if missing - to match the provided CRS.

@@ -56,15 +56,15 @@ def __init__(self):
def initAlgorithm(self, config=None):
self.addParameter(QgsProcessingParameterVectorLayer(self.INPUT,
self.tr('Input Layer'), types=[QgsProcessing.TypeVectorAnyGeometry]))
self.addParameter(QgsProcessingParameterCrs(self.CRS, 'Output CRS'))
self.addParameter(QgsProcessingParameterCrs(self.CRS, 'CRS'))
self.addOutput(QgsProcessingOutputVectorLayer(self.INPUT,
self.tr('Layer with projection')))

def name(self):
return 'definecurrentprojection'

def displayName(self):
return self.tr('Define current projection')
return self.tr('Define layer projection')

def flags(self):
return super().flags() | QgsProcessingAlgorithm.FlagNoThreading
@@ -81,15 +81,17 @@ def processAlgorithm(self, parameters, context, feedback):
if dsPath.lower().endswith('.shp'):
dsPath = dsPath[:-4]

wkt = crs.toWkt()
with open(dsPath + '.prj', 'w') as f:
f.write(wkt)

qpjFile = dsPath + '.qpj'
if os.path.exists(qpjFile):
with open(qpjFile, 'w') as f:
wkt = crs.toWkt()
with open(dsPath + '.prj', 'w') as f:
f.write(wkt)

qpjFile = dsPath + '.qpj'
if os.path.exists(qpjFile):
with open(qpjFile, 'w') as f:
f.write(wkt)
else:
feedback.pushConsoleInfo(tr("Data source isn't a shapefile, skipping .prj/.qpj creation"))

layer.setCrs(crs)
layer.triggerRepaint()

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