On Monday, February 18, 2019 at 9:40:56 PM UTC-5, rich T wrote:
>
> I'm able to transpose current data onto a captured image using PIL and
> querying the database. It is still a work in progress. Was wondering if
> creating a service would be the best way to go forward?
>
you could do it as a service. but it might be better to do it as a weewx
generator.
create the file 'wxoverlay.py' in your weewx user directory, with contents
something like this:
import weewx
import weewx.reportengine
class WXOverlayGenerator(weewx.reportengine.ReportGeneraor):
def run(self):
filename = self.skin_dict.get('filename', '/var/tmp/image.png')
# query the database for latest wind speed and direction
dbmgr = self.db_binder.get_manager()
ts = dbmgr.lastGoodStamp()
if ts is None:
# there may be no archive data yet
return
record = dbmgr.getRecord(ts)
# wind speed and dir may not be in the record (depends on the
schema) and may be None
windSpeed = record.get('windSpeed')
windDir = record.get('windDir')
# Open the file with the binary image...
with open(filename, 'rb+') as fd:
# ... read it ...
image = fd.read()
# ... then manipulate it
new_image = self.fancy_function_to_overlay_wind(image,
windSpeed, windDir)
# Replace the old image with the new image
fd.seek(0)
fd.write(image)
fd.truncate()
def fancy_function_to_overlay_wind(self, image, wind_speed, wind_dir):
# do your fancy stuff here
pass
then in your weewx configuration (or skin.conf) tell it to run in the skin:
[WXOverlayGenerator]
filename = /var/tmp/image.png
[StdReport]
...
[[ReportWithOverlay]]
skin = Seasons
...
[[[Generators]]]
generator_list = ..., user.wxoverlay.WXOverlayGenerator
for an example of a working generator, see the weewx-sftp generator, and
see the section 'The database' in the weewx customization guide for
examples of how to bind to the database.
m
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