Re: [Matplotlib-users] autoscale using class library

[John H. <jdh...@ac...>]

>>>>> "David" == David  <dav...@fr...> writes:

    David> Hi all, and thanks for amazing matplotlib.  I devellop my
    David> data processing / plotting software using glade, pygtk,
    David> scipy and matplotlib 0.83.2.

    David> I use the class library and I run into trouble with
    David> autoscaling.

    David> I expected that autoscale_view() function of axes class
    David> would do autoscaling. But if I update the data using
    David> set_data(), set_xdatat() or set_ydata() (of lines object)
    David> and I call autoscale_view() of the corresponding axes and
    David> then redraw the canvas, the scale is not changed and some
    David> data points are thus out of the picture.

    David> Do I miss or misunderstand something ?


The axes keeps a copy of the "dataLim" and won't automatically know if
you change the line's data.  You need to call

  ax.update_datalim_numerix(x, y, ignore)

where x and y are the numerix arrays you pass to line.set_data.

If ignore is True, the previous data passed to the axes will be
ignored in computing the new datalim.  If False, the datalim will
include the previous data and the current data you are passing it.

After this, a call to 

 ax.autoscale_view()

should work as you expect.

JDH