On Friday, March 24, 2017 at 1:00:38 PM UTC-4, Alec Bennett wrote:
>
> Just wanted to correct this, which after some research I think is wrong:
>
> > Doing some research, it looks like the key to plotting curves in PIL is 
> Bezier Curves.
>
> Ater some trial and error I don't think those curves are appropriate for 
> plotting exact numbers.  
>
 
Is the attached what you have in mind? It uses Xtide text output, for 
example (the "-em SsMm" suppress the moon and sunrise/set outputs):
tide -em SsMm -tf "%H:%M" -l "Branford, Branford River, Connecticut"
2017-03-30 13:47   6.61 feet  High Tide

2017-03-30 19:49  -0.53 feet  Low Tide

2017-03-31 02:04   7.10 feet  High Tide

2017-03-31 08:25  -0.82 feet  Low Tide

2017-03-31 14:38   6.42 feet  High Tide

2017-03-31 20:40  -0.30 feet  Low Tide

2017-04-01 02:56   6.92 feet  High Tide

2017-04-01 09:19  -0.58 feet  Low Tide

2017-04-01 15:33   6.17 feet  High Tide

2017-04-01 21:36  -0.01 feet  Low Tide

2017-04-02 03:53   6.65 feet  High Tide

2017-04-02 10:19  -0.28 feet  Low Tide

2017-04-02 16:33   5.94 feet  High Tide

2017-04-02 22:37   0.27 feet  Low Tide

2017-04-03 04:54   6.36 feet  High Tide

2017-04-03 11:22  -0.02 feet  Low Tide

What I used to generate the PNG is GNUplot <http://gnuplot.info>, which is 
serious overkill for this need but is infinitely customizable. It's not too 
hard to add Moon phase icons as well, though I haven't put that in here 
(and the data in my image don't correspond with the data in the above 
output). The GNUplot code is pretty rough but I'll share it if anyone is 
interested.

I have no real idea how to integrate this into weewx except to run it every 
24 hours and let weewx upload the generated image; I haven't even started 
to look at that part.




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