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fixed minor issues in algorithm execution and logging added support for multiline strings updated credits in about html page git-svn-id: http://sextante.googlecode.com/svn/trunk/soft/bindings/qgis-plugin@334 881b9c09-3ef8-f3c2-ec3d-21d735c97f4d
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volayaf
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Aug 6, 2012
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,217 @@ | ||
| from sextante.core.GeoAlgorithm import GeoAlgorithm | ||
| from sextante.outputs.OutputVector import OutputVector | ||
| from sextante.parameters.ParameterVector import ParameterVector | ||
| from qgis.core import * | ||
| from PyQt4.QtCore import * | ||
| from PyQt4.QtGui import * | ||
| from sextante.parameters.ParameterString import ParameterString | ||
| from sextante.core.QGisLayers import QGisLayers | ||
| import os | ||
| from PyQt4 import QtGui | ||
| from sextante.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException | ||
| from sextante.parameters.ParameterBoolean import ParameterBoolean | ||
| import sys | ||
|
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| class FieldsPyculator(GeoAlgorithm): | ||
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| INPUT_LAYER = "INPUT_LAYER" | ||
| USE_SELECTED = "USE_SELECTED" | ||
| FIELD_NAME = "FIELD_NAME" | ||
| #USE_GLOBAL = "USE_GLOBAL" | ||
| GLOBAL = "GLOBAL" | ||
| FORMULA = "FORMULA" | ||
| OUTPUT_LAYER ="OUTPUT_LAYER" | ||
| RESULT_VAR_NAME = "value" | ||
|
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| def getIcon(self): | ||
| return QtGui.QIcon(os.path.dirname(__file__) + "/../images/toolbox.png") | ||
|
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| def defineCharacteristics(self): | ||
| self.name = "Field Pyculator" | ||
| self.group = "Algorithms for vector layers" | ||
| self.addParameter(ParameterVector(self.INPUT_LAYER, "Input layer", ParameterVector.VECTOR_TYPE_ANY, False)) | ||
| self.addParameter(ParameterBoolean(self.USE_SELECTED, "Use only selected features", False)) | ||
| self.addParameter(ParameterString(self.FIELD_NAME, "Result field name", "NewField")) | ||
| #self.addParameter(ParameterBoolean(self.USE_GLOBAL, "Use global expression", False)) | ||
| self.addParameter(ParameterString(self.GLOBAL, "Global expression", multiline = True)) | ||
| self.addParameter(ParameterString(self.FORMULA, "Formula", "value = ", multiline = True)) | ||
| self.addOutput(OutputVector(self.OUTPUT_LAYER, "Output layer")) | ||
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| def processAlgorithm(self, progress): | ||
| fieldname = self.getParameterValue(self.FIELD_NAME) | ||
| code = self.getParameterValue(self.FORMULA) | ||
| globalExpression = self.getParameterValue(self.GLOBAL) | ||
| #useGlobal = self.getParameterValue(self.USE_GLOBAL) | ||
| useSelected = self.getParameterValue(self.USE_SELECTED) | ||
| settings = QSettings() | ||
| systemEncoding = settings.value( "/UI/encoding", "System" ).toString() | ||
| output = self.getOutputValue(self.OUTPUT_LAYER) | ||
| layer = QGisLayers.getObjectFromUri(self.getParameterValue(self.INPUT_LAYER)) | ||
| vprovider = layer.dataProvider() | ||
| allAttrs = vprovider.attributeIndexes() | ||
| vprovider.select( allAttrs ) | ||
| fields = vprovider.fields() | ||
| fields[len(fields)] = QgsField(fieldname, QVariant.Double) | ||
| writer = QgsVectorFileWriter( output, systemEncoding,fields, vprovider.geometryType(), vprovider.crs() ) | ||
| outFeat = QgsFeature() | ||
| nFeatures = vprovider.featureCount() | ||
| nElement = 0 | ||
| new_ns = {} | ||
|
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||
| #run global code | ||
| if globalExpression.strip() != "": | ||
| try: | ||
| bytecode = compile(globalExpression, '<string>', 'exec') | ||
| exec bytecode in new_ns | ||
| except: | ||
| raise GeoAlgorithmExecutionException("FieldPyculator code execute error\n" + | ||
| "Global code block can't be executed!%s \n %s" % | ||
| (unicode(sys.exc_info()[0].__name__), unicode(sys.exc_info()[1]))) | ||
|
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||
| #replace all fields tags | ||
| field_map = vprovider.fields() | ||
| for num, field in field_map.iteritems(): | ||
| field_name = unicode(field.name()) | ||
| replval = '__attr[' + str(num) + ']' | ||
| code = code.replace("<"+field_name+">",replval) | ||
|
|
||
| #replace all special vars | ||
| code = code.replace('$id','__id') | ||
| code = code.replace('$geom','__geom') | ||
| need_id = code.find("__id") != -1 | ||
| need_geom = code.find("__geom") != -1 | ||
| need_attrs = code.find("__attr") != -1 | ||
|
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| #compile | ||
| try: | ||
| bytecode = compile(code, '<string>', 'exec') | ||
| except: | ||
| raise GeoAlgorithmExecutionException("FieldPyculator code execute error\n"+ | ||
| "Field code block can't be executed! %s \n %s" | ||
| (unicode(sys.exc_info()[0].__name__), unicode(sys.exc_info()[1]))) | ||
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| #run | ||
| if not useSelected: | ||
| feat = QgsFeature() | ||
| if need_attrs: | ||
| attr_ind = vprovider.attributeIndexes() | ||
| else: | ||
| attr_ind = [] | ||
| vprovider.select(attr_ind, QgsRectangle(), True) | ||
|
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| while vprovider.nextFeature(feat): | ||
| progress.setPercentage(int((100 * nElement)/nFeatures)) | ||
| attrMap = feat.attributeMap() | ||
| feat_id = feat.id() | ||
|
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||
| #add needed vars | ||
| if need_id: | ||
| new_ns['__id'] = feat_id | ||
|
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| if need_geom: | ||
| geom = feat.geometry() | ||
| new_ns['__geom'] = geom | ||
|
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| if need_attrs: | ||
| attr = [] | ||
| for num,a in attrMap.iteritems(): | ||
| attr.append(self.Qvar2py(a)) | ||
| new_ns['__attr'] = attr | ||
|
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||
| #clear old result | ||
| if new_ns.has_key(self.RESULT_VAR_NAME): | ||
| del new_ns[self.RESULT_VAR_NAME] | ||
|
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| #exec | ||
| #try: | ||
| exec bytecode in new_ns | ||
| #except: | ||
| # raise e | ||
| #=============================================================== | ||
| # GeoAlgorithmExecutionException("FieldPyculator code execute error\n"+ | ||
| # "Field code block can't be executed for feature %s\n%s\n%s" % | ||
| # (unicode(sys.exc_info()[0].__name__), | ||
| # unicode(sys.exc_info()[1]), | ||
| # unicode(feat_id))) | ||
| #=============================================================== | ||
|
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| #check result | ||
| if not new_ns.has_key(self.RESULT_VAR_NAME): | ||
| raise GeoAlgorithmExecutionException("FieldPyculator code execute error\n" + | ||
| "Field code block does not return '%s1' variable! Please declare this variable in your code!" % | ||
| self.RESULT_VAR_NAME) | ||
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| #write feature | ||
| nElement += 1 | ||
| outFeat.setGeometry( feat.geometry() ) | ||
| outFeat.setAttributeMap( attrMap ) | ||
| outFeat.addAttribute(len(vprovider.fields()), QVariant(new_ns[self.RESULT_VAR_NAME])) | ||
| writer.addFeature(outFeat) | ||
|
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||
| else: | ||
| features = layer.selectedFeatures() | ||
| nFeatures = len(features) | ||
| for feat in features: | ||
| progress.setPercentage(int((100 * nElement)/nFeatures)) | ||
| attrMap = feat.attributeMap() | ||
| feat_id = feat.id() | ||
|
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| #add needed vars | ||
| if need_id: | ||
| new_ns['__id'] = feat_id | ||
|
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| if need_geom: | ||
| geom = feat.geometry() | ||
| new_ns['__geom'] = geom | ||
|
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| if need_attrs: | ||
| attrMap = feat.attributeMap() | ||
| attr = [] | ||
| for num,a in attrMap.iteritems(): | ||
| attr.append(self.Qvar2py(a)) | ||
| new_ns['__attr'] = attr | ||
|
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| #clear old result | ||
| if new_ns.has_key(self.RESULT_VAR_NAME): | ||
| del new_ns[self.RESULT_VAR_NAME] | ||
|
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| #exec | ||
| exec bytecode in new_ns | ||
|
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| #check result | ||
| if not new_ns.has_key(self.RESULT_VAR_NAME): | ||
| raise GeoAlgorithmExecutionException("FieldPyculator code execute error\n" + | ||
| "Field code block does not return '%s1' variable! Please declare this variable in your code!" % | ||
| self.RESULT_VAR_NAME) | ||
|
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| #write feature | ||
| nElement += 1 | ||
| outFeat.setGeometry( feat.geometry() ) | ||
| outFeat.setAttributeMap( attrMap ) | ||
| outFeat.addAttribute(len(vprovider.fields()), QVariant(new_ns[self.RESULT_VAR_NAME])) | ||
| writer.addFeature(outFeat) | ||
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| del writer | ||
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| def Qvar2py(self,qv): | ||
| if qv.type() == 2: | ||
| return qv.toInt()[0] | ||
| if qv.type() == 10: | ||
| return unicode(qv.toString()) | ||
| if qv.type() == 6: | ||
| return qv.toDouble()[0] | ||
| return None | ||
|
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|
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| def checkParameterValuesBeforeExecuting(self): | ||
| ##TODO check that formula is correct and fields exist | ||
| pass | ||
|
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||
|
|
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