axes3d panning

emilyfy · emilyfy · commit 7255a1a2459e · 2020-09-21T11:26:04.000+08:00
diff --git a/lib/mpl_toolkits/mplot3d/axes3d.py b/lib/mpl_toolkits/mplot3d/axes3d.py
@@ -1237,11 +1237,25 @@ def _on_move(self, event):
             self.stale = True
             self.figure.canvas.draw_idle()
 
-#        elif self.button_pressed == 2:
+        elif self.button_pressed == 2:
             # pan view
+            # get the x and y pixel coords
+            if dx == 0 and dy == 0:
+                return
+            minx, maxx, miny, maxy, minz, maxz = self.get_w_lims()
+            dx = 1-((w - dx)/w)
+            dy = 1-((h - dy)/h)
+            elev, azim = np.deg2rad(self.elev), np.deg2rad(self.azim)
             # project xv, yv, zv -> xw, yw, zw
+            dxx = (maxx-minx) * ( dy * np.sin(elev) * np.cos(azim) + dx * np.sin(azim) )
+            dyy = (maxy-miny) * ( - dx * np.cos(azim) + dy * np.sin(elev) * np.sin(azim) )
+            dzz = (maxz-minz) * ( - dy * np.cos(elev) )
             # pan
-#            pass
+            self.set_xlim3d(minx + dxx, maxx + dxx)
+            self.set_ylim3d(miny + dyy, maxy + dyy)
+            self.set_zlim3d(minz + dzz, maxz + dzz)
+            self.get_proj()
+            self.figure.canvas.draw_idle()
 
         # Zoom
         elif self.button_pressed in self._zoom_btn:
