Allow sharing Locators and Formatters across Axises.

anntzer · anntzer · commit 9ff4d61d2089 · 2019-08-29T17:25:27.000+02:00
diff --git a/lib/matplotlib/axis.py b/lib/matplotlib/axis.py
@@ -643,12 +643,18 @@ class Ticker:
     """
 
     def __init__(self):
+        self._axis = None
         self._locator = None
         self._formatter = None
 
+    # The machinery below allows TickHelpers to be shared over multiple Axis.
+
     @property
     def locator(self):
-        return self._locator
+        locator = self._locator
+        if locator is not None:
+            locator.set_axis(self._axis)
+        return locator
 
     @locator.setter
     def locator(self, locator):
@@ -661,7 +667,10 @@ def locator(self, locator):
 
     @property
     def formatter(self):
-        return self._formatter
+        formatter = self._formatter
+        if formatter is not None:
+            formatter.set_axis(self._axis)
+        return formatter
 
     @formatter.setter
     def formatter(self, formatter):
@@ -672,6 +681,10 @@ def formatter(self, formatter):
                 "and support for them will be removed %(removal)s.")
         self._formatter = formatter
 
+    @locator.setter
+    def locator(self, locator):
+        self._locator = locator
+
 
 class _LazyTickList:
     """
@@ -759,8 +772,8 @@ def __init__(self, axes, pickradius=15):
         self.isDefault_label = True
 
         self.axes = axes
-        self.major = Ticker()
-        self.minor = Ticker()
+        self._major = Ticker()
+        self._minor = Ticker()
         self.callbacks = cbook.CallbackRegistry()
 
         self._autolabelpos = True
@@ -779,6 +792,28 @@ def __init__(self, axes, pickradius=15):
         self.cla()
         self._set_scale('linear')
 
+    # The machinery below allows TickHelpers to be shared over multiple Axis.
+
+    @property
+    def major(self):
+        major = self._major
+        major._axis = self
+        return major
+
+    @major.setter
+    def major(self, major):
+        self._major = major
+
+    @property
+    def minor(self):
+        minor = self._minor
+        minor._axis = self
+        return minor
+
+    @minor.setter
+    def minor(self, minor):
+        self._minor = minor
+
     # During initialization, Axis objects often create ticks that are later
     # unused; this turns out to be a very slow step.  Instead, use a custom
     # descriptor to make the tick lists lazy and instantiate them as needed.
