Bugfix in plot functions

We were double counting for fowt position in the array (x_ref, y_ref). This was causing the platform and rotor visualization to be quite far from where they actually are for units not at (0,0)

raft/raft_fowt.py

@@ -2100,14 +2100,14 @@ def plot(self, ax, color=None, nodes=0, plot_rotor=True, station_plot=[],
         if plot_fowt:
             if plot_rotor:
                 for rotor in self.rotorList:
-                    rotor.plot(ax, r_ptfm=self.r6[:3]+np.array([self.x_ref, self.y_ref, 0]), color=color, airfoils=airfoils, zorder=zorder)
+                    rotor.plot(ax, color=color, airfoils=airfoils, zorder=zorder)
 
             # loop through each member and plot it
             for mem in self.memberList:
 
                 mem.setPosition()  # offsets/rotations could be done in this function rather than in mem.plot <<<
 
-                mem.plot(ax, r_ptfm=self.r6[:3]+np.array([self.x_ref, self.y_ref, 0]), R_ptfm=R, color=color, 
+                mem.plot(ax, r_ptfm=self.r6[:3], R_ptfm=R, color=color, 
                         nodes=nodes, station_plot=station_plot, zorder=zorder)
 
         # in future should consider ability to animate mode shapes and also to animate response at each frequency

raft/raft_rotor.py

@@ -1001,7 +1001,7 @@ def calcAero(self, case, current=False, display=0):
         return self.f0, self.f, self.a, self.b #  B_aero, C_aero, F_aero0, F_aero
 
 
-    def plot(self, ax, r_ptfm=[0,0,0], azimuth=0, color='k', 
+    def plot(self, ax, r_ptfm=np.array([0,0,0]), azimuth=0, color='k', 
              airfoils=False, draw_circle=False,
              plot2d=False, Xuvec=[1,0,0], Yuvec=[0,0,1], zorder=2):
         '''Draws the rotor on the passed axes, considering optional platform