Re: axes limit calculations

[Michael Goffioul]

There's a patch pending in the graphics mq that triggers listeners
only when a property is actually changed (the same for the built-in
updaters). This should avoid the problem you mention. The patches
are base_properties_autogen and property_change_check.

This however does not apply to "xxxmode" properties, which are
set to "manual" in all cases.

Michael.


On Tue, Aug 26, 2008 at 5:55 PM, David Bateman
<address@hidden> wrote:
> While adding the graphics group objects like bar series, I noticed an issue
> with the way the axis limits are updated. The problem is that with each new
> object added or updated the limits are set, even if they aren't changed.
>
> In general this would not cause a problem, but due to the fact that I
> associate a callback function to the "xlim" property of the axis to update
> the baseline of the bar and stem series, this callback is called many many
> more times that it needs to be. As the callback can be expensive this is an
> issue.
>
> I see two manners in which to treat this issue
>
> * If the [xyzac]limmode is "auto" and the value of the limit remains the
> same, don't set the value and therefore don't execute the callbacks. Of
> course if the [xyzac]limmode is "manual" and the limit is set even if its
> the same value then the callback should be called as this means the user
> explicitly set the limit
>
> * If the [xyzac]limmode is "auto" then defer the setting of the limit itself
> till the [xyzac]lim_get method is called.
>
> Michael/Shai could we make a change like this? If so it would make the bar
> and stem series objects significantly faster.
>
> Regards
> David
>
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