Re: [matplotlib-devel] svn zoom

[Darren D. <dd...@co...>]

On Thursday 10 August 2006 11:17, John Hunter wrote:
> >>>>> "Darren" == Darren Dale <dd...@co...> writes:
>
>     Darren> I fixed that problem in the qt backends by telling the
>     Darren> label to ignore sizing hints. We could make the format
>     Darren> string shorter, but even then, depending on the size of
>     Darren> the window, this problem can occur. What format would you
>     Darren> prefer to be reported on the toolbar?
>
> I'm a little confused here because the default should be to use the
> axis major formatter (eg in the Axes.format_xdata function).  Why
> would the default formatter return such a long string?

I think it is to support for small ranges on top of very large numbers. I 
think the fix you suggest below will work for now (I had to make an 
additional change to format the offset label correctly, svn 2668), and I can 
clean up the default formatter later. I don't want to rush through that. 
People have asked for on more than one occassion for engineering notation: 
tick labels that read 2x10^-5, they would read 20x10^-6, and I think this 
would work with the shorter string formatting.

> I don't know what the right answer is: using the default formatter is
> usually irritating when plotting dates, since you often want a finer
> resolution than you get with the tick formatting (eg if the ticks are
> formatted to the nearest day, you may want to see H:M:S when
> interacting).  Clearly you can override this by using the fmt_xdata
> and fmt_ydata attrs, but oftentimes I wish the defaults were better.
>
> As a quick solution, I added a default method to the Formatter base
> class
>
>     def format_data_short(self,value):
>         'return a short string version'
>         return format_data(self,value)
>
> and overrode it for the scalar formatter
>
>     def format_data_short(self,value):
>         'return a short formatted string representation of a number'
>         return '%1.3g'%value
>
>
> and used this to format the x and y coords.  What do you think about
> that (revision 2666)?
>
> JDH
>
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