[processing][needs-docs] Make Find Projection algorithm simpler to use

We no longer require the seperate CRS parameter, because the extent parameter contains the CRS information itself. This means the algorithm is simplified to just picking the layer and drawing the desired area on the canvas. (cherry picked from commit c6f3d5f)
qgis · Feb 7, 2019 · 985abf1 · 985abf1
1 parent d590055
commit 985abf1
Showing 1 changed file with 12 additions and 4 deletions.
diff --git a/python/plugins/processing/algs/qgis/FindProjection.py b/python/plugins/processing/algs/qgis/FindProjection.py
@@ -40,7 +40,8 @@
                        QgsProcessingParameterFeatureSource,
                        QgsProcessingParameterExtent,
                        QgsProcessingParameterCrs,
-                       QgsProcessingParameterFeatureSink)
+                       QgsProcessingParameterFeatureSink,
+                       QgsProcessingParameterDefinition)
 from qgis.PyQt.QtCore import QVariant
 
 from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
@@ -72,9 +73,12 @@ def initAlgorithm(self, config=None):
                                                               self.tr('Input layer')))
         extent_parameter = QgsProcessingParameterExtent(self.TARGET_AREA,
                                                         self.tr('Target area for layer'))
-        #extent_parameter.skip_crs_check = True
         self.addParameter(extent_parameter)
-        self.addParameter(QgsProcessingParameterCrs(self.TARGET_AREA_CRS, 'Target area CRS'))
+
+        # deprecated
+        crs_param = QgsProcessingParameterCrs(self.TARGET_AREA_CRS, 'Target area CRS', optional=True)
+        crs_param.setFlags(crs_param.flags() | QgsProcessingParameterDefinition.FlagHidden)
+        self.addParameter(crs_param)
 
         self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT,
                                                             self.tr('CRS candidates')))
@@ -91,7 +95,11 @@ def processAlgorithm(self, parameters, context, feedback):
             raise QgsProcessingException(self.invalidSourceError(parameters, self.INPUT))
 
         extent = self.parameterAsExtent(parameters, self.TARGET_AREA, context)
-        target_crs = self.parameterAsCrs(parameters, self.TARGET_AREA_CRS, context)
+        target_crs = self.parameterAsExtentCrs(parameters, self.TARGET_AREA, context)
+        if self.TARGET_AREA_CRS in parameters:
+            c = self.parameterAsCrs(parameters, self.TARGET_AREA_CRS, context)
+            if c.isValid():
+                target_crs = c
 
         target_geom = QgsGeometry.fromRect(extent)