On Thu, May 15, 2008 at 3:41 AM, Friedrich Hagedorn <[EMAIL PROTECTED]> wrote:
> On Thu, May 15, 2008 at 10:20:23AM +0200, Friedrich Hagedorn wrote:
>> Hello,
>>
>> I think the following is'nt right:
>>
>> In [1]: plot([1,2,3])
>> Out[1]: [<matplotlib.lines.Line2D object at 0x8f9b0ec>]
>>
>> In [2]: ylim(-4,4)
>> Out[2]: (-4, 4)
>>
>> In [3]: axhline()
>> Out[3]: <matplotlib.lines.Line2D object at 0x8f9bc0c>
While I agree the behavior here is not optimal, I don't think the fix
is right. axhline already tells the axes not to autoscale in the x
direction, as it should
l, = self.plot([xmin,xmax], [y,y], transform=trans, scalex=False, **kwargs)
so I don't think automatically forcing the autoscale off entirely for
x and y as in your patch is what we want in general. For example,
consider this case
plot([1,2,3])
ylim(-4,4)
axhline(20)
What we want is to autoscale only if autoscale_on=True *and* the hline
is outside the current bounds. Something like:
ymin, ymax = self.get_ylim()
if ymax<ymin: ymin, ymax = ymax, ymin
scaley = (y<ymin) or (y>ymax)
trans = mtransforms.blended_transform_factory(
self.transAxes, self.transData)
l, = self.plot([xmin,xmax], [y,y], transform=trans,
scalex=False, scaley=scaley, **kwargs)
I just committed this to svn in r5141 so give it a test drive and let
me know what you think.
There is an unrelated problem with the autoscaler which is that in the example
plot([1,2,3])
axhline(20)
it sets ymax to 20 making the hline invisible. We should probably
force the ylimits to be strictly outside the data limits in some cases
when autoscaling.
JDH
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