Fix plot_wing.py to work for matplotlib v3.8+ (#425)

* Remove the use of the dist attribute for 3-D plots, which has been
    deprecated in the recent matplotlib versions.
  * Make the 3-D view behavior consitent in plot_wingbox.py, i.e., the
    view does not reset if the iteration is changed.

openaerostruct/utils/plot_wing.py

@@ -465,7 +465,6 @@ def plot_wing(self):
         self.ax.cla()
         az = self.ax.azim
         el = self.ax.elev
-        dist = self.ax.dist
 
         for j, name in enumerate(self.names):
             mesh0 = self.mesh[self.curr_pos * n_names + j].copy()
@@ -577,7 +576,6 @@ def plot_wing(self):
             self.ax.text2D(0.15, 0.05, self.obj_key + ": {}".format(obj_val), transform=self.ax.transAxes, color="k")
 
         self.ax.view_init(elev=el, azim=az)  # Reproduce view
-        self.ax.dist = dist
 
     def save_video(self):
         options = dict(title="Movie", artist="Matplotlib")

openaerostruct/utils/plot_wingbox.py

@@ -591,6 +591,8 @@ def plot_sides(self):
     def plot_wing(self):
         n_names = len(self.names)
         self.ax.cla()
+        az = self.ax.azim
+        el = self.ax.elev
 
         for j, name in enumerate(self.names):
             # for wingbox viz
@@ -755,7 +757,7 @@ def plot_wing(self):
                 color="k",
             )
 
-        self.ax.view_init()  # Reproduce view
+        self.ax.view_init(elev=el, azim=az)  # Reproduce view
 
     def save_video(self):
         options = dict(title="Movie", artist="Matplotlib")