[FIX] Scatter Plot: subset data

Orange/widgets/visualize/owscatterplot.py

@@ -313,6 +313,7 @@ def set_subset_data(self, subset_data):
             else:
                 self.warning("Data subset does not support large Sql tables")
                 subset_data = None
+        self.subset_data = subset_data
         self.controls.graph.alpha_value.setEnabled(subset_data is None)
 
     # called when all signals are received, so the graph is updated only once

Orange/widgets/visualize/tests/test_owscatterplot.py

@@ -503,6 +503,30 @@ def test_handle_metas(self):
         simulate.combobox_activate_item(w.controls.graph.attr_color, data.domain.metas[0].name)
         w.update_graph()
 
+    def test_subset_data(self):
+        """
+        Scatter Plot subset data is sent to Scatter Plot Graph
+        GH-2773
+        """
+        data = Table("iris")
+        w = self.widget
+        self.send_signal(w.Inputs.data, data)
+        self.send_signal(w.Inputs.data_subset, data[::30])
+        self.assertEqual(len(w.graph.subset_indices), 5)
+
+    def test_sparse_subset_data(self):
+        """
+        Scatter Plot can handle sparse subset data.
+        GH-2773
+        """
+        data = Table("iris")
+        w = self.widget
+        data.X = sp.csr_matrix(data.X)
+        self.send_signal(w.Inputs.data, data)
+        self.send_signal(w.Inputs.data_subset, data[::30])
+        self.assertEqual(len(w.graph.subset_indices), 5)
+
+
 if __name__ == "__main__":
     import unittest
     unittest.main()