#4549 Add python method to get cell centers on a grid

Equivalent to GetCellCenters in Octave.

ApplicationCode/GrpcInterface/Python/rips/grid.py

@@ -13,7 +13,7 @@ import rips.generated.Grid_pb2_grpc as Grid_pb2_grpc
 class Grid:
     """Grid Information. Not meant to be constructed separately
 
-    Create Grid objects using mathods on Case: Grid() and Grids()
+    Create Grid objects using methods on Case: Grid() and Grids()
     """
     def __init__(self, index, case, channel):
         self.__channel = channel
@@ -32,3 +32,30 @@ class Grid:
         return self.__stub.GetDimensions(
             Grid_pb2.GridRequest(case_request=case_request,
                                  grid_index=self.index)).dimensions
+
+
+    def cell_centers_async(self):
+        """The cells center for all cells in given grid async.
+
+        Returns:
+            Iterator to a list of Vec3d: class with double attributes x, y, x giving cell centers
+        """
+        case_request = Case_pb2.CaseRequest(id=self.case.case_id)
+        chunks = self.__stub.GetCellCenters(
+            Grid_pb2.GridRequest(case_request=case_request,
+                                 grid_index=self.index))
+        for chunk in chunks:
+            yield chunk
+
+    def cell_centers(self):
+        """The cell center for all cells in given grid
+
+        Returns:
+            List of Vec3d: class with double attributes x, y, x giving cell centers
+        """
+        centers = []
+        chunks = self.cell_centers_async()
+        for chunk in chunks:
+            for center in chunk.centers:
+                centers.append(center)
+        return centers

ApplicationCode/GrpcInterface/Python/rips/tests/test_grids.py

@@ -15,3 +15,6 @@ def test_10k(rips_instance, initialize_test):
     assert(dimensions.i == 90)
     assert(dimensions.j == 96)
     assert(dimensions.k == 36)
+
+    cell_centers = grid.cell_centers()
+    assert(len(cell_centers) == (dimensions.i * dimensions.j * dimensions.k))