added some gdal algs

git-svn-id: http://sextante.googlecode.com/svn/trunk/soft/bindings/qgis-plugin@69 881b9c09-3ef8-f3c2-ec3d-21d735c97f4d

Author: volayaf

src/sextante/gdal/GdalAlgorithmProvider.py

@@ -13,6 +13,7 @@
 from sextante.gdal.translate import translate
 from sextante.gdal.pct2rgb import pct2rgb
 from sextante.gdal.merge import merge
+from sextante.gdal.polygonize import polygonize
 
 class GdalAlgorithmProvider(AlgorithmProvider):
 
@@ -50,7 +51,7 @@ def _loadAlgorithms(self):
     def createAlgsList(self):
         #First we populate the list of algorihtms with those created extending
         #GeoAlgorithm directly (those that execute GDAL using the console)
-        self.preloadedAlgs = [nearblack(), information(), warp(), translate(), rgb2pct(), pct2rgb(), merge()]
+        self.preloadedAlgs = [nearblack(), information(), warp(), translate(), rgb2pct(), pct2rgb(), merge(), polygonize()]
         #And then we add those that are created as python scripts
         folder = self.scriptsFolder()
         for descriptionFile in os.listdir(folder):

src/sextante/gdal/polygonize.py

@@ -0,0 +1,34 @@
+from PyQt4 import QtGui
+from sextante.core.GeoAlgorithm import GeoAlgorithm
+from sextante.parameters.ParameterRaster import ParameterRaster
+import os
+from sextante.gdal.GdalUtils import GdalUtils
+from sextante.parameters.ParameterString import ParameterString
+from sextante.outputs.OutputVector import OutputVector
+
+class polygonize(GeoAlgorithm):
+
+    INPUT = "INPUT"
+    OUTPUT = "OUTPUT"
+    FIELD = "FIELD"
+
+    def getIcon(self):
+        filepath = os.path.dirname(__file__) + "/icons/polygonize.png"
+        return QtGui.QIcon(filepath)
+
+    def defineCharacteristics(self):
+        self.name = "polygonize"
+        self.group = "Conversion"
+        self.addParameter(ParameterRaster(polygonize.INPUT, "Input layer", False))
+        self.addParameter(ParameterString(polygonize.FIELD, "Output field name", "Value"))
+        self.addOutput(OutputVector(polygonize.OUTPUT, "Output layer"))
+
+    def processAlgorithm(self, progress):
+        commands = ["polygonize"]
+        commands.append(self.getParameterValue(polygonize.INPUT))
+        commands.append("-f")
+        commands.append("ESRI Shapefile")
+        commands.append(self.getOutputValue(polygonize.OUTPUT))
+        commands.append(self.getParameterValue(polygonize.FIELD))
+
+        GdalUtils.runGdal(commands, progress)