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[processing] added variables to scope when inputing value of a ParameterNumber

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This commit is contained in:
volaya 2016-04-08 15:19:38 +02:00
parent e55b280fa9
commit 7805c64208
1 changed files with 41 additions and 2 deletions
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43
python/plugins/processing/gui/NumberInputPanel.py
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@ -33,8 +33,10 @@ from PyQt.QtGui import QDialog
from math import log10, floor
from qgis.core import (QgsDataSourceURI, QgsCredentials, QgsExpressionContext,
QgsExpressionContextUtils, QgsExpression)
QgsExpressionContextUtils, QgsExpression, QgsRasterLayer)
from qgis.gui import QgsEncodingFileDialog, QgsExpressionBuilderDialog
from qgis.utils import iface
from processing.tools import dataobjects
pluginPath = os.path.split(os.path.dirname(__file__))[0]
WIDGET, BASE = uic.loadUiType(
@ -87,7 +89,9 @@ class NumberInputPanel(BASE, WIDGET):
def showExpressionsBuilder(self):
context = QgsExpressionContext()
context.appendScope(QgsExpressionContextUtils.globalScope())
context.appendScope(QgsExpressionContextUtils.projectScope())
scope = QgsExpressionContextUtils.projectScope()
self.addVariablesToScope(scope)
context.appendScope(scope)
dlg = QgsExpressionBuilderDialog(None, self.spnValue.text(), self, "generic", context)
dlg.setWindowTitle(self.tr("Expression based input"));
if dlg.exec_() == QDialog.Accepted:
@ -100,6 +104,41 @@ class NumberInputPanel(BASE, WIDGET):
except:
pass
def addVariablesToScope(self, scope):
layers = dataobjects.getAllLayers()
for layer in layers:
name = layer.name()
scope.setVariable("%s_minx" % name, layer.extent().xMinimum())
scope.setVariable("%s_miny" % name, layer.extent().yMinimum())
scope.setVariable("%s_maxx" % name, layer.extent().xMaximum())
scope.setVariable("%s_maxy" % name, layer.extent().yMaximum())
if isinstance(layer, QgsRasterLayer):
cellsize = (layer.extent().xMaximum()
- layer.extent().xMinimum()) / layer.width()
scope.setVariable("%s_cellsize" % name, cellsize)
layers = dataobjects.getRasterLayers()
for layer in layers:
for i in range(layer.bandCount()):
stats = layer.dataProvider().bandStatistics(i + 1)
scope.setVariable("%s_band%i_avg" % (name, i + 1), stats.mean)
scope.setVariable("%s_band%i_stddev" % (name, i + 1), stats.stdDev)
scope.setVariable("%s_band%i_min" % (name, i + 1), stats.minimumValue)
scope.setVariable("%s_band%i_max" % (name, i + 1), stats.maximumValue)
extent = iface.mapCanvas().extent()
scope.setVariable("canvasextent_minx", extent.xMinimum())
scope.setVariable("canvasextent_miny", extent.yMinimum())
scope.setVariable("canvasextent_maxx", extent.xMaximum())
scope.setVariable("canvasextent_maxy", extent.yMaximum())
extent = iface.mapCanvas().fullExtent()
scope.setVariable("fullextent_minx", extent.xMinimum())
scope.setVariable("fullextent_miny", extent.yMinimum())
scope.setVariable("fullextent_maxx", extent.xMaximum())
scope.setVariable("fullextent_maxy", extent.yMaximum())
def getValue(self):
return self.spnValue.value()