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Cheshire Cat Computing :: View topic - Dividing line at zero when displaying negative values
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Dividing line at zero when displaying negative values
http://steveshipway.org/forum/viewtopic.php?f=26&t=8091
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Author:  gerch_winnheuer [ Tue Jan 29, 2013 12:18 am ]
Post subject:  Dividing line at zero when displaying negative values

Hi Steve,

can you add a dividing line to the graphs at the value of zero when displaying negative values (such as temperature) just like you do for the mirrored graphs?
See my screenshot with a black dividing line:
hc_2013.01.28_12_16_47.jpg
hc_2013.01.28_12_16_47.jpg [ 179.6 KiB | Viewed 11305 times ]

Author:  stevesh [ Tue Jan 29, 2013 4:54 pm ]
Post subject:  Re: Dividing line at zero when displaying negative values

You mean, highlight the zero line?

I notice that RRDTool doesnt do this. It would be an easy thing to add (HRULE:0:#000000) but might cause issues elsewhere? Will test.

Author:  stevesh [ Tue Jan 29, 2013 5:57 pm ]
Post subject:  Re: Dividing line at zero when displaying negative values

Done in 2.23beta2

Author:  gerch_winnheuer [ Wed Jan 30, 2013 12:36 am ]
Post subject:  Re: Dividing line at zero when displaying negative values

Yes, I mean highlighting the zero line.
But of course only if there are any negative values present. In "normal" situations, the zero line must not be highlighted.

Author:  gerch_winnheuer [ Fri Feb 01, 2013 12:13 am ]
Post subject:  Re: Dividing line at zero when displaying negative values

I have a little update/question:
In the summary page the graph has something like a very light line at zero. Where does this line come from?

Attachments:
Temperature.cfg-localtemp-ws-l2.png
Temperature.cfg-localtemp-ws-l2.png [ 14.73 KiB | Viewed 11286 times ]

Author:  stevesh [ Fri Feb 15, 2013 5:19 pm ]
Post subject:  Re: Dividing line at zero when displaying negative values

The very light line is created by the RRDTool libraries by default. However it can get obscured by other data.

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