On Wed, Jul 13, 2011 at 6:49 PM, Benjamin Root <ben.r...@ou.edu> wrote:
> On Wednesday, July 13, 2011, Justin McCann <jne...@gmail.com> wrote:
>> $ ipython -pylab
>> # ====
>> from matplotlib.collections import LineCollection
>> f = figure()
>> plot()
>> ax = gca()
>> vec = numpy.random.random((10,3))
>> segs = []
>> for i in range(0, len(vec)):
>> x1 = vec[i][0]
>> #x1 = 3000000
>> x2 = vec[i][1]
>> #x2 = 4000000
>> y1 = y2 = vec[i][2]
>> segs.extend( [[(x1,y1),(x2,y2)]] )
>>
>> line_segments = LineCollection(segs, linewidth=3, alpha=0.3, colors =
>> 'r', linestyle = 'solid')
>> ax.add_collection(line_segments)
>> ax.set_xlim(0,1)
>> ax.set_ylim(0,1)
>> show() # hmmmm... nothing yet
>> draw() # force a draw; now it works
>>
...
> Just an observation (I haven't tested anything)... But what is up with
> the call to plot()? It might be causing issues with the autoscaler.
> Any line collections created without other plotting functions is going
> to need the axes limits set.
>
> Ben Root
>
Yeah, that was weird. :)
I added that when I was first messing around, and the axes didn't show
up even when I called show(). If you do the draw() at the end, then
you don't need to call plot(), and then you also don't need to mess
with the view limits (set_{x,y}lim).
I guess the moral of the story is, "if you don't explicitly plot() [or
a variant], you must explicitly draw()."
===
from matplotlib.collections import LineCollection
f = figure()
ax = gca()
vec = numpy.random.random((10,3))
segs = []
for i in range(0, len(vec)):
x1 = vec[i][0]
x2 = vec[i][1]
y1 = y2 = vec[i][2]
segs.extend( [[(x1,y1),(x2,y2)]] )
line_segments = LineCollection(segs, linewidth=3, alpha=0.3,
colors='r', linestyle='solid')
ax.add_collection(line_segments)
draw() # force a draw; now it works
====
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