Add a height scaling factor when using default height (#56)

* set a heigh multiplier

* only use hidden height factor attr in default height method

cmeutils/tests/test_visualize.py

@@ -134,8 +134,12 @@ def test_box_radius(self, p3ht_fresnel):
         assert p3ht_fresnel.box_radius == 0.1
 
     def test_default_height(self, p3ht_fresnel):
-        assert p3ht_fresnel.height == np.linalg.norm(
-            p3ht_fresnel.box_length[:3] * p3ht_fresnel.view_axis
+        assert (
+            p3ht_fresnel.height
+            == np.linalg.norm(
+                p3ht_fresnel.box_length[:3] * p3ht_fresnel.view_axis
+            )
+            * p3ht_fresnel._height_factor
         )
 
     def test_reset_height(self, p3ht_fresnel):

cmeutils/visualize.py

@@ -75,6 +75,7 @@ def __init__(
         self.gsd_file = gsd_file
         with gsd.hoomd.open(gsd_file) as traj:
             self._n_frames = len(traj)
+        self._height_factor = 1.25
         self._unwrap_positions = unwrap_positions
         self._snapshot = None
         self._view_axis = np.asarray(view_axis)
@@ -89,7 +90,6 @@ def __init__(
         self._specular = specular
         self._specular_trans = specular_trans
         self._metal = metal
-        # self._view_axis = np.asarray(view_axis)
         self._up = np.asarray(up)
         self._show_box = show_box
         self._box_radius = box_radius
@@ -321,7 +321,8 @@ def box_length(self):
 
     def _default_height(self):
         """Set the height based on box dimensions and view axis"""
-        return np.linalg.norm(self.view_axis * self.box_length[:3])
+        height = np.linalg.norm(self.view_axis * self.box_length[:3])
+        return height * self._height_factor
 
     def reset_height(self):
         """Reset the height of the camera to the default."""