Hi,
As good as the plot engine is it is fairly simplistic and arbitrary
horizontal lines are something it cannot do out of the box. Two ideas comes
to mind though. If your python skills are up to it you could modify the
plot engine to draw arbitrary horizontal lines :). Alternatively, you could
use two unused database fields, say extraTemp1 and extraTemp2, and through
the StdCalibrate service permanently set them to 0C and 30C respectively.
Something like:
[StdCalibrate]
[[Corrections]]
extraTemp1 = 0
extraTemp2 = 30
Note that this assumes your database uses degree C (METRIC or METRICWX), if
not (ie US) you would need to use the Fahrenheit equivalents. You could
then simply add extraTemp1 and extraTemp2 to your plot. It would take time
for the constant values to propagate through your plots, you could speed
things up and backfill manually if you are competent with SQL.
This approach is wasteful of database space but would achieve the effect
you desire.
Gary
On Wednesday, 17 May 2017 07:47:06 UTC+10, Marco Biner wrote:
>
> Hi
> here a neewbe question:
> How can I draw a horizontal line in a temerpature graph
> a blue one for 0° C
> a red one for 30° C
>
> Marco
>
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