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WebAgg backend #1426

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Merged
merged 18 commits into from
Jan 4, 2013
Merged

WebAgg backend #1426

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dd32575
Initial work on WebAgg backend
mdboom Oct 15, 2012
31479e6
mplot3d should call canvas.draw_idle()
mdboom Oct 22, 2012
2f9c992
Address documentation and smaller issues raised by @pelson in #1426.
mdboom Oct 23, 2012
021d74d
Revert change to how width and height are handled -- the other was ca…
mdboom Oct 23, 2012
914e525
Handle slightly older versions of Firefox.
mdboom Oct 23, 2012
0c99763
Handle non-binary image streams
mdboom Oct 23, 2012
6e735d5
Display URL if not set to open webbrowser
mdboom Oct 23, 2012
d9e68a4
Remove some logging
mdboom Oct 23, 2012
8193feb
Fix toolbar button events on Firefox.
mdboom Oct 23, 2012
5efca62
Add message about stopping the server
mdboom Oct 24, 2012
bf11a13
Warn when using a browser that doesn't support binary websocket messa…
mdboom Oct 24, 2012
8f414b4
Add support for rubberband drawing.
mdboom Nov 29, 2012
788c8c9
Make the html backend prettier with ipython's css and switch port to …
crbates Dec 17, 2012
d977828
remove empty ipython notebook
crbates Dec 17, 2012
499a960
Add jquery ui hover hook for buttons
crbates Dec 18, 2012
c5479c2
Move status message to a new line
crbates Dec 18, 2012
ae884b0
PEP8 fixes. Rename web_static -> web_backend
mdboom Jan 4, 2013
1789f6c
Indentation
mdboom Jan 4, 2013
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8 changes: 4 additions & 4 deletions examples/widgets/slider_demo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,8 @@
import matplotlib.pyplot as plt
from matplotlib.widgets import Slider, Button, RadioButtons

ax = plt.subplot(111)
fig = plt.figure()
ax = fig.add_subplot(111)
plt.subplots_adjust(left=0.25, bottom=0.25)
t = np.arange(0.0, 1.0, 0.001)
a0 = 5
Expand All @@ -22,7 +23,7 @@ def update(val):
amp = samp.val
freq = sfreq.val
l.set_ydata(amp*np.sin(2*np.pi*freq*t))
plt.draw()
fig.canvas.draw_idle()
sfreq.on_changed(update)
samp.on_changed(update)

Expand All @@ -37,8 +38,7 @@ def reset(event):
radio = RadioButtons(rax, ('red', 'blue', 'green'), active=0)
def colorfunc(label):
l.set_color(label)
plt.draw()
fig.canvas.draw_idle()
radio.on_clicked(colorfunc)

plt.show()

7 changes: 5 additions & 2 deletions lib/matplotlib/animation.py
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Expand Up @@ -523,7 +523,10 @@ class Animation(object):
'''
def __init__(self, fig, event_source=None, blit=False):
self._fig = fig
self._blit = blit
# Disables blitting for backends that don't support it. This
# allows users to request it if available, but still have a
# fallback that works if it is not.
self._blit = blit and fig.canvas.supports_blit
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This seems a little unfriendly. If I ask for blitting, I would expect to get it - otherwise I should get an error. What do you think?

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This deserves some explanation. Some backends, such as WebAgg, do not support blitting. In the case of WebAgg, it's because blitting is not possible -- we don't have direct access to the window/screen buffers anyway, so there is no advantage to it. This allows code that was written to expect blitting (such as all of the examples/animation examples) to still work. There should be consistent behavior across backends, even when certain features are not available.


# These are the basics of the animation. The frame sequence represents
# information for each frame of the animation and depends on how the
Expand All @@ -543,7 +546,7 @@ def __init__(self, fig, event_source=None, blit=False):
# fire events and try to draw to a deleted figure.
self._close_id = self._fig.canvas.mpl_connect('close_event',
self._stop)
if blit:
if self._blit:
self._setup_blit()

def _start(self, *args):
Expand Down
11 changes: 0 additions & 11 deletions lib/matplotlib/axes.py
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Expand Up @@ -2116,17 +2116,6 @@ def redraw_in_frame(self):
def get_renderer_cache(self):
return self._cachedRenderer

def __draw_animate(self):
# ignore for now; broken
if self._lastRenderer is None:
raise RuntimeError('You must first call ax.draw()')
dsu = [(a.zorder, a) for a in self.animated.keys()]
dsu.sort(key=lambda x: x[0])
renderer = self._lastRenderer
renderer.blit()
for tmp, a in dsu:
a.draw(renderer)

#### Axes rectangle characteristics

def get_frame_on(self):
Expand Down
2 changes: 2 additions & 0 deletions lib/matplotlib/backend_bases.py
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Expand Up @@ -1482,6 +1482,8 @@ class FigureCanvasBase(object):
'close_event'
]

supports_blit = True
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I wonder if it should be the other way around: By default a backend cannot blit, but if you implement the functionality, and toggle the switch, you get it...

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That's possible -- I was just trying to be backward compatible here with third-party backends that don't currently implement this value.


def __init__(self, figure):
figure.set_canvas(self)
self.figure = figure
Expand Down
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