Added ImagePlot, which displays a dataset as an image.

workflows/test_workflow.py

@@ -29,6 +29,7 @@ class TestWorkflow (workflow.Workflow):
 
         go = workflow.Stage('go', 'Gene Ontology Data')
         go.add_function(GODistanceFunction())
+        go.add_function(ImagePlotFunction())
         self.add_stage(go)
 
         regression = workflow.Stage('regression', 'Regression')
@@ -97,6 +98,14 @@ class GODistanceFunction(workflow.Function):
         return gene_distances
 
 
+class ImagePlotFunction(workflow.Function):
+    def __init__(self):
+        workflow.Function.__init__(self, 'image', 'Show Image')
+
+    def run(self, data):
+        return [plots.ImagePlot(data, name='foo')]
+
+
 class TestDataFunction(workflow.Function):  
     def __init__(self):
         workflow.Function.__init__(self, 'test_data', 'Generate Test Data')