diff --git a/doc/users/whats_new/2015-01-19_cursor_pixel_data.rst b/doc/users/whats_new/2015-01-19_cursor_pixel_data.rst
new file mode 100644
index 000000000000..4490e9df35e4
--- /dev/null
+++ b/doc/users/whats_new/2015-01-19_cursor_pixel_data.rst
@@ -0,0 +1,6 @@
+Allow Artists to Display Pixel Data in Cursor
+---------------------------------------------
+
+Adds `get_pixel_data` and `format_pixel_data` methods to artists
+which can be used to add zdata to the cursor display
+in the status bar. Also adds an implementation for Images.
diff --git a/lib/matplotlib/artist.py b/lib/matplotlib/artist.py
index 7fb492367f1d..57fdf1bb673a 100644
--- a/lib/matplotlib/artist.py
+++ b/lib/matplotlib/artist.py
@@ -903,6 +903,22 @@ def matchfunc(x):
artists.append(self)
return artists
+ def get_cursor_data(self, event):
+ """
+ Get the cursor data for a given event.
+ """
+ return None
+
+ def format_cursor_data(self, data):
+ """
+ Return *cursor data* string formatted.
+ """
+ try:
+ data[0]
+ except (TypeError, IndexError):
+ data = [data]
+ return ', '.join('{:0.3g}'.format(item) for item in data)
+
class ArtistInspector(object):
"""
diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
index 02f67136e7d0..a53a084877e6 100644
--- a/lib/matplotlib/backend_bases.py
+++ b/lib/matplotlib/backend_bases.py
@@ -1694,15 +1694,9 @@ def onRemove(self, ev):
canvas.mpl_connect('mouse_press_event',canvas.onRemove)
"""
- def sort_artists(artists):
- # This depends on stable sort and artists returned
- # from get_children in z order.
- L = [(h.zorder, h) for h in artists]
- L.sort()
- return [h for zorder, h in L]
-
# Find the top artist under the cursor
- under = sort_artists(self.figure.hitlist(ev))
+ under = self.figure.hitlist(ev)
+ under.sort(key=lambda x: x.zorder)
h = None
if under:
h = under[-1]
@@ -2800,6 +2794,16 @@ def mouse_move(self, event):
except (ValueError, OverflowError):
pass
else:
+ artists = event.inaxes.hitlist(event)
+ if event.inaxes.patch in artists:
+ artists.remove(event.inaxes.patch)
+
+ if artists:
+ artists.sort(key=lambda x: x.zorder)
+ a = artists[-1]
+ data = a.get_cursor_data(event)
+ if data is not None:
+ s += ' [%s]' % a.format_cursor_data(data)
if len(self.mode):
self.set_message('%s, %s' % (self.mode, s))
else:
diff --git a/lib/matplotlib/image.py b/lib/matplotlib/image.py
index 2428147218bb..189091d95eb9 100644
--- a/lib/matplotlib/image.py
+++ b/lib/matplotlib/image.py
@@ -683,6 +683,20 @@ def get_extent(self):
else:
return (-0.5, numcols-0.5, -0.5, numrows-0.5)
+ def get_cursor_data(self, event):
+ """Get the cursor data for a given event"""
+ xmin, xmax, ymin, ymax = self.get_extent()
+ if self.origin == 'upper':
+ ymin, ymax = ymax, ymin
+ arr = self.get_array()
+ data_extent = mtransforms.Bbox([[ymin, xmin], [ymax, xmax]])
+ array_extent = mtransforms.Bbox([[0, 0], arr.shape[:2]])
+ trans = mtransforms. BboxTransform(boxin=data_extent,
+ boxout=array_extent)
+ y, x = event.ydata, event.xdata
+ i, j = trans.transform_point([y, x]).astype(int)
+ return arr[i, j]
+
class NonUniformImage(AxesImage):
def __init__(self, ax, **kwargs):
diff --git a/lib/matplotlib/tests/test_image.py b/lib/matplotlib/tests/test_image.py
index 89338d33fdad..c1e0ec7f9e82 100644
--- a/lib/matplotlib/tests/test_image.py
+++ b/lib/matplotlib/tests/test_image.py
@@ -158,6 +158,39 @@ def test_imsave_color_alpha():
assert_array_equal(data, arr_buf)
+
+@cleanup
+def test_cursor_data():
+ from matplotlib.backend_bases import MouseEvent
+
+ fig, ax = plt.subplots()
+ im = ax.imshow(np.arange(100).reshape(10, 10), origin='upper')
+
+ x, y = 4, 4
+ xdisp, ydisp = ax.transData.transform_point([x, y])
+
+ event = MouseEvent('motion_notify_event', fig.canvas, xdisp, ydisp)
+ assert im.get_cursor_data(event) == 44
+
+ ax.clear()
+ im = ax.imshow(np.arange(100).reshape(10, 10), origin='lower')
+
+ x, y = 4, 4
+ xdisp, ydisp = ax.transData.transform_point([x, y])
+
+ event = MouseEvent('motion_notify_event', fig.canvas, xdisp, ydisp)
+ assert im.get_cursor_data(event) == 44
+
+ fig, ax = plt.subplots()
+ im = ax.imshow(np.arange(100).reshape(10, 10), extent=[0, 0.5, 0, 0.5])
+
+ x, y = 0.25, 0.25
+ xdisp, ydisp = ax.transData.transform_point([x, y])
+
+ event = MouseEvent('motion_notify_event', fig.canvas, xdisp, ydisp)
+ assert im.get_cursor_data(event) == 55
+
+
@image_comparison(baseline_images=['image_clip'])
def test_image_clip():
from math import pi
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