Call `compute_bbox` one date at a time

Preparing for dates at different slices, which will need different
readers.

Inst_eddies/Analysis/anim_eddy_contours.py

@@ -12,17 +12,16 @@ def bbox_union(b1, b2):
         return [min(b1[0], b2[0]), min(b1[1], b2[1]), max(b1[2], b2[2]),
                 max(b1[3], b2[3])]
 
-def compute_bbox(ishape_lists, reader_outer):
-    """ishape_lists should be a dictionary."""
+def compute_bbox(ishape_list, reader_outer):
+    """ishape_list should be a list."""
 
     bbox = None
 
-    for ishape_list in ishape_lists.values():
-        for ishape in ishape_list:
-            try:
-                bbox = bbox_union(bbox, reader_outer.shape(ishape).bbox)
-            except AttributeError:
-                pass
+    for ishape in ishape_list:
+        try:
+            bbox = bbox_union(bbox, reader_outer.shape(ishape).bbox)
+        except AttributeError:
+            pass
 
     return bbox
 
@@ -59,10 +58,11 @@ def anim_eddies(fig, ax, SHPC, window, d_min, d_max, light):
         bbox = None
         
         for orientation in ["Anticyclones", "Cyclones"]:
-            b2 = compute_bbox(ishape_lists_all[orientation],
+            for d in range(d_min, d_max + 1):
+                b2 = compute_bbox(ishape_lists_all[orientation][d],
                               SHPC.get_reader(0, orientation,
                                               "outermost_contour"))
-            bbox = bbox_union(bbox, b2)
+                bbox = bbox_union(bbox, b2)
     else:
         bbox = window