Handle line and box on the same plot

Author: MartinBraquet

pandas/plotting/_matplotlib/core.py

@@ -1855,7 +1855,6 @@ def __init__(
         self.bar_width = width
         self._align = align
         self._position = position
-        self.tick_pos = np.arange(len(data))
 
         if is_list_like(bottom):
             bottom = np.array(bottom)
@@ -1868,6 +1867,12 @@ def __init__(
 
         MPLPlot.__init__(self, data, **kwargs)
 
+        self.tick_pos = (
+            np.array(self.ax.xaxis.convert_units(self._get_xticks()))
+            if isinstance(data.index, ABCPeriodIndex)
+            else np.arange(len(data))
+        )
+
     @cache_readonly
     def ax_pos(self) -> np.ndarray:
         return self.tick_pos - self.tickoffset