Port BarPlot alg to new API

Author: nyalldawson

python/plugins/processing/algs/qgis/BarPlot.py

@@ -30,11 +30,12 @@
 
 
 from qgis.core import (QgsApplication,
-                       QgsProcessingUtils)
-from processing.core.parameters import ParameterTable
-from processing.core.parameters import ParameterTableField
+                       QgsProcessingUtils,
+                       QgsProcessingParameterFeatureSource,
+                       QgsProcessingParameterTableField,
+                       QgsProcessingParameterFileOutput,
+                       QgsProcessingOutputHtml)
 from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
-from processing.core.outputs import OutputHTML
 from processing.tools import vector
 
 
@@ -56,17 +57,19 @@ def group(self):
 
     def __init__(self):
         super().__init__()
-        self.addParameter(ParameterTable(self.INPUT, self.tr('Input table')))
-        self.addParameter(ParameterTableField(self.NAME_FIELD,
-                                              self.tr('Category name field'),
-                                              self.INPUT,
-                                              ParameterTableField.DATA_TYPE_ANY))
-        self.addParameter(ParameterTableField(self.VALUE_FIELD,
-                                              self.tr('Value field'),
-                                              self.INPUT,
-                                              ParameterTableField.DATA_TYPE_NUMBER))
-
-        self.addOutput(OutputHTML(self.OUTPUT, self.tr('Bar plot')))
+
+        self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
+                                                              self.tr('Input layer')))
+        self.addParameter(QgsProcessingParameterTableField(self.NAME_FIELD,
+                                                           self.tr('Category name field'),
+                                                           None, self.INPUT, QgsProcessingParameterTableField.Any))
+        self.addParameter(QgsProcessingParameterTableField(self.VALUE_FIELD,
+                                                           self.tr('Value field'),
+                                                           None, self.INPUT, QgsProcessingParameterTableField.Numeric))
+
+        self.addParameter(QgsProcessingParameterFileOutput(self.OUTPUT, self.tr('Added'), self.tr('HTML files (*.html)')))
+
+        self.addOutput(QgsProcessingOutputHtml(self.OUTPUT, self.tr('Bar plot')))
 
     def name(self):
         return 'barplot'
@@ -75,16 +78,19 @@ def displayName(self):
         return self.tr('Bar plot')
 
     def processAlgorithm(self, parameters, context, feedback):
-        layer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT), context)
-        namefieldname = self.getParameterValue(self.NAME_FIELD)
-        valuefieldname = self.getParameterValue(self.VALUE_FIELD)
+        source = self.parameterAsSource(parameters, self.INPUT, context)
 
-        output = self.getOutputValue(self.OUTPUT)
+        namefieldname = self.parameterAsString(parameters, self.NAME_FIELD, context)
+        valuefieldname = self.parameterAsString(parameters, self.VALUE_FIELD, context)
 
-        values = vector.values(layer, valuefieldname)
+        output = self.parameterAsFileOutput(parameters, self.OUTPUT, context)
 
-        x_var = [i[namefieldname] for i in layer.getFeatures()]
+        values = vector.values(source, valuefieldname)
+
+        x_var = [i[namefieldname] for i in source.getFeatures()]
 
         data = [go.Bar(x=x_var,
                        y=values[valuefieldname])]
         plt.offline.plot(data, filename=output, auto_open=False)
+
+        return {self.OUTPUT: output}

python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py

@@ -265,17 +265,18 @@ def getAlgs(self):
                 Boundary(),
                 BoundingBox()]
 
-        # if hasPlotly:
-        #     from .VectorLayerHistogram import VectorLayerHistogram
-        #     from .RasterLayerHistogram import RasterLayerHistogram
-        #     from .VectorLayerScatterplot import VectorLayerScatterplot
-        #     from .MeanAndStdDevPlot import MeanAndStdDevPlot
-        #     from .BarPlot import BarPlot
+        if hasPlotly:
+            #     from .VectorLayerHistogram import VectorLayerHistogram
+            #     from .RasterLayerHistogram import RasterLayerHistogram
+            #     from .VectorLayerScatterplot import VectorLayerScatterplot
+            #     from .MeanAndStdDevPlot import MeanAndStdDevPlot
+            from .BarPlot import BarPlot
         #     from .PolarPlot import PolarPlot
         #     from .BoxPlot import BoxPlot
         #     from .VectorLayerScatterplot3D import VectorLayerScatterplot3D
         #
-        #     algs.extend([VectorLayerHistogram(), RasterLayerHistogram(),
+            algs.extend([BarPlot()])
+            #[VectorLayerHistogram(), RasterLayerHistogram(),
         #                  VectorLayerScatterplot(), MeanAndStdDevPlot(),
         #                  BarPlot(), PolarPlot(), BoxPlot(),
         #                  VectorLayerScatterplot3D()])