From 247689ddce6e13849d383d7d11635c4c1ad706a1 Mon Sep 17 00:00:00 2001
From: Cimarron Mittelsteadt <cimarronm@gmail.com>
Date: Tue, 30 Apr 2013 12:20:21 -0700
Subject: [PATCH 1/3] Fixes issue #1960. Account for right/top spine data
 offset on transform when doing spine.set_position(). Also includes a testcase
 for the data locations.

---
 lib/matplotlib/spines.py                      |   2 +
 .../test_spines/spines_data_positions.pdf     | Bin 0 -> 5078 bytes
 .../test_spines/spines_data_positions.png     | Bin 0 -> 13804 bytes
 .../test_spines/spines_data_positions.svg     | 544 ++++++++++++++++++
 lib/matplotlib/tests/test_spines.py           |  11 +
 5 files changed, 557 insertions(+)
 create mode 100644 lib/matplotlib/tests/baseline_images/test_spines/spines_data_positions.pdf
 create mode 100644 lib/matplotlib/tests/baseline_images/test_spines/spines_data_positions.png
 create mode 100644 lib/matplotlib/tests/baseline_images/test_spines/spines_data_positions.svg

diff --git a/lib/matplotlib/spines.py b/lib/matplotlib/spines.py
index 55bc58462e1f..ba8682bab7f6 100644
--- a/lib/matplotlib/spines.py
+++ b/lib/matplotlib/spines.py
@@ -323,6 +323,8 @@ def _calc_offset_transform(self):
                 self._spine_transform = ('identity',
                                          mtransforms.IdentityTransform())
         elif position_type == 'data':
+            if self.spine_type in ('right', 'top'):
+                amount -= 1   # translate left by one to account for right/top data offset of one
             if self.spine_type in ('left', 'right'):
                 self._spine_transform = ('data',
                                          mtransforms.Affine2D().translate(
diff --git a/lib/matplotlib/tests/baseline_images/test_spines/spines_data_positions.pdf b/lib/matplotlib/tests/baseline_images/test_spines/spines_data_positions.pdf
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diff --git a/lib/matplotlib/tests/baseline_images/test_spines/spines_data_positions.png b/lib/matplotlib/tests/baseline_images/test_spines/spines_data_positions.png
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diff --git a/lib/matplotlib/tests/test_spines.py b/lib/matplotlib/tests/test_spines.py
index 9674215dac99..82046706af55 100644
--- a/lib/matplotlib/tests/test_spines.py
+++ b/lib/matplotlib/tests/test_spines.py
@@ -19,3 +19,14 @@ def test_spines_axes_positions():
     ax.xaxis.set_ticks_position('top')
     ax.spines['left'].set_color('none')
     ax.spines['bottom'].set_color('none')
+
+@image_comparison(baseline_images=['spines_data_positions'])
+def test_spines_data_positions():
+    fig = plt.figure()
+    ax = fig.add_subplot(1,1,1)
+    ax.spines['left'].set_position(('data', -1.5))
+    ax.spines['top'].set_position(('data', 0.5))
+    ax.spines['right'].set_position(('data', -0.5))
+    ax.spines['bottom'].set_position('zero')
+    ax.set_xlim([-2,2])
+    ax.set_ylim([-2,2])
\ No newline at end of file

From c1546748d3269f34b061925f03672b8a0b64bea6 Mon Sep 17 00:00:00 2001
From: Cimarron Mittelsteadt <cimarronm@gmail.com>
Date: Wed, 1 May 2013 08:15:51 -0700
Subject: [PATCH 2/3] Improved comment for data spine transform adjustment -
 taken from mdboom.

---
 lib/matplotlib/spines.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/matplotlib/spines.py b/lib/matplotlib/spines.py
index ba8682bab7f6..d0b7a26d1dfa 100644
--- a/lib/matplotlib/spines.py
+++ b/lib/matplotlib/spines.py
@@ -324,7 +324,10 @@ def _calc_offset_transform(self):
                                          mtransforms.IdentityTransform())
         elif position_type == 'data':
             if self.spine_type in ('right', 'top'):
-                amount -= 1   # translate left by one to account for right/top data offset of one
+                # The right and top spines have a default position of 1 in
+                # axes coordinates.  When specifying the position in data
+                # coordinates, we need to calculate the position relative to 0.
+                amount -= 1
             if self.spine_type in ('left', 'right'):
                 self._spine_transform = ('data',
                                          mtransforms.Affine2D().translate(

From 6f45b4325af6f4399b9f0d230d6b7f8865e33bcb Mon Sep 17 00:00:00 2001
From: Cimarron Mittelsteadt <cimarronm@gmail.com>
Date: Thu, 2 May 2013 08:34:52 -0700
Subject: [PATCH 3/3] Added bullet to api_changes documentation on PR #1964

---
 doc/api/api_changes.rst | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/doc/api/api_changes.rst b/doc/api/api_changes.rst
index 0ed2dd87a796..98aa4873605a 100644
--- a/doc/api/api_changes.rst
+++ b/doc/api/api_changes.rst
@@ -15,6 +15,10 @@ For new features that were added to matplotlib, please see
 Changes in 1.3.x
 ================
 
+* Fixed a bug in setting the position for the right/top spine with data 
+  position type. Previously, it would draw the right or top spine at
+  +1 data offset.
+
 * In :class:`~matplotlib.patches.FancyArrow`, the default arrow head width,
   ``head_width``, has been made larger to produce a visible arrow head. The new
   value of this kwarg is ``head_width = 20 * width``.