[hobbit] zoom graph feature

[Galen Johnson]

Galen Johnson wrote:
> Henrik Stoerner wrote:
>> In <45BED60F.9030805 at trantor.org> Galen Johnson 
>> <gjohnson at trantor.org> writes:
>>
>>  
>>> I think this has come up previously but I don't recall seeing a 
>>> response...but how hard would it be to have the Zoom Graph function 
>>> set the graph max to more accurately reflect the height of the block 
>>> you select...ie, if I have a low load and I select a max height of 
>>> around .2 when I drag my box, could the max on the new zoom be .2 
>>> instead of 1.0?
>>>     
>>
>> First of all, it would require that you're using version 1.2.x of the 
>> RRDtool
>> library. I guess it's safe to upgrade now, but back when I was 
>> putting the zoom stuff together, rrdtool 1.2 wasn't quite stable.
>>
>> rrdtool 1.0 simply doesn't provide the information about the value 
>> range on the y-axis that is needed to implement the zoom. Tobi 
>> Oetiker who maintains
>> the rrdtool library added this in 1.2 at my suggestion :-)
>>
>> I'll look at reviving some old code I had to implement this. It 
>> requires some changes to both the hobbitgraph CGI and the zoom.js 
>> javascript code.
>>
>>
>> Regards,
>> Henrik
>>   
> Sweet, I'm already using 1.2 so that'd be awesome if you could.
>
> =G=
>
>
It looks like this may be in the latest snapshot.  I grabbed it and put 
the hobbitgraph.cgi and zoom.js and put them in place.  I tried it and 
it mostly works.  The one thing I've noticed is it doesn't work as 
expected with multivalue graphs such as disks and memory.  When you 
select and area, it still tries to show all the values regardless of 
whether the area selected contains the line.

=G=