Fix mouse-over display for reversed polar plots

tacaswell · tacaswell · commit 53342c661815 · 2014-05-18T17:10:21.000-04:00
Close issue #2541 Merge remote-tracking branch 'Rickkwa/master' Conflicts: CHANGELOG doc/users/whats_new.rst
diff --git a/CHANGELOG b/CHANGELOG
@@ -33,6 +33,10 @@
            the managemnet of the xlimits and ticks when making a boxplot.
            Default in True which maintains current behavior by default.
 
+2014-03-23 Fixed a bug in projections/polar.py by making sure that the theta
+           value being calculated when given the mouse coordinates stays within
+           the range of 0 and 2 * pi.
+
 2014-03-22 Added the keyword arguments wedgeprops and textprops to pie.
            Users can control the wedge and text properties of the pie
            in more detail, if they choose.
@@ -46,7 +50,7 @@
 2014-02-28 Added 'origin' kwarg to `spy`
 
 2014-02-27 Implemented separate horizontal/vertical axes padding to the
-           ImageGrid in the AxesGrid toolkit
+	   ImageGrid in the AxesGrid toolkit
 
 2014-02-27 Allowed markevery property of matplotlib.lines.Line2D to be, an int
            numpy fancy index, slice object, or float.  The float behaviour
diff --git a/doc/users/whats_new.rst b/doc/users/whats_new.rst
@@ -182,6 +182,15 @@ shows markers at approximately equal display-coordinate-distances along the
 line.
 
 
+Fixed the mouse coordinates giving the wrong theta value in Polar graph
+```````````````````````````````````````````````````````````````````````
+Added code to
+:funct:`~matplotlib.InvertedPolarTransform.transform_non_affine`
+to ensure that the calculated theta value was between the range of 0 and 2 * pi
+since the problem was that the value can become negative after applying the
+direction and rotation to the theta calculation.
+
+
 Date handling
 -------------
 
diff --git a/lib/matplotlib/projections/polar.py b/lib/matplotlib/projections/polar.py
@@ -151,6 +151,7 @@ def transform_non_affine(self, xy):
 
         theta -= theta_offset
         theta *= theta_direction
+        theta %= 2 * np.pi
 
         r += rmin
 
