[processing] expose Slope from Raster terrain analysis plugin in toolbox

alexbruy · alexbruy · commit 48c7c49c73c3 · 2016-10-11T11:55:34.000+03:00
diff --git a/python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py b/python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py
@@ -159,6 +159,7 @@
 from .SingleSidedBuffer import SingleSidedBuffer
 from .PointsAlongGeometry import PointsAlongGeometry
 from .Aspect import Aspect
+from .Slope import Slope
 
 pluginPath = os.path.normpath(os.path.join(
     os.path.split(os.path.dirname(__file__))[0], os.pardir))
@@ -215,7 +216,7 @@ def __init__(self):
                         BoundingBox(), Boundary(), PointOnSurface(),
                         OffsetLine(), PolygonCentroids(), Translate(),
                         SingleSidedBuffer(), PointsAlongGeometry(),
-                        Aspect(),
+                        Aspect(), Slope(),
                         ]
 
         if hasMatplotlib:
diff --git a/python/plugins/processing/algs/qgis/Slope.py b/python/plugins/processing/algs/qgis/Slope.py
@@ -0,0 +1,64 @@
+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    Slope.py
+    ---------------------
+    Date                 : October 2016
+    Copyright            : (C) 2016 by Alexander Bruy
+    Email                : alexander dot bruy at gmail dot com
+***************************************************************************
+*                                                                         *
+*   This program is free software; you can redistribute it and/or modify  *
+*   it under the terms of the GNU General Public License as published by  *
+*   the Free Software Foundation; either version 2 of the License, or     *
+*   (at your option) any later version.                                   *
+*                                                                         *
+***************************************************************************
+"""
+from builtins import str
+
+__author__ = 'Alexander Bruy'
+__date__ = 'October 2016'
+__copyright__ = '(C) 2016, Alexander Bruy'
+
+# This will get replaced with a git SHA1 when you do a git archive
+
+__revision__ = '$Format:%H$'
+
+from qgis.analysis import QgsSlopeFilter
+
+from processing.core.GeoAlgorithm import GeoAlgorithm
+from processing.core.parameters import ParameterRaster
+from processing.core.parameters import ParameterNumber
+from processing.core.outputs import OutputRaster
+from processing.tools import raster
+
+
+class Slope(GeoAlgorithm):
+
+    INPUT_LAYER = 'INPUT_LAYER'
+    Z_FACTOR = 'Z_FACTOR'
+    OUTPUT_LAYER = 'OUTPUT_LAYER'
+
+    def defineCharacteristics(self):
+        self.name, self.i18n_name = self.trAlgorithm('Slope')
+        self.group, self.i18n_group = self.trAlgorithm('Raster terrain analysis')
+
+        self.addParameter(ParameterRaster(self.INPUT_LAYER,
+                                          self.tr('Elevation layer')))
+        self.addParameter(ParameterNumber(self.Z_FACTOR,
+                                          self.tr('Z factor'), 1.0, 999999.99, 1.0))
+        self.addOutput(OutputRaster(self.OUTPUT_LAYER,
+                                    self.tr('Slope')))
+
+    def processAlgorithm(self, progress):
+        inputFile = self.getParameterValue(self.INPUT_LAYER)
+        zFactor = self.getParameterValue(self.Z_FACTOR)
+        outputFile = self.getOutputValue(self.OUTPUT_LAYER)
+
+        outputFormat = raster.formatShortNameFromFileName(outputFile)
+
+        slope = QgsSlopeFilter(inputFile, outputFile, outputFormat)
+        slope.setZFactor(zFactor)
+        slope.processRaster(None)
