I don't see that you ever got a reply.
Python f-strings allow for field width specifiers. For example:
f"{record['outTemp']:.0f}°"
f"{record['barometer']:.2f}
Hope that helps.
- Nate
On Sunday, October 15, 2023 at 12:38:06 PM UTC-5 Lorin Tremblay wrote:
> I always wanted to learn how to code but never had time or a need.
>
> Now my first attempt to build an extension is in the works.
>
> The 1st question is acceptable to ask help or opinions in this
> group/community? If so continue reading :)
>
>
> Now I don’t know if this extension already exists, but I know that here a
> similar extension to do the same, but regardless I want it to be a learning
> experience.
>
> I’m using pillow to add text to a jpg picture.
>
> So far I capable of adding the txt to the picture with the variable that I
> want.
> My problems occurs when I want added it in the unit_system (aka US, METRIC
> and METRICWX) and also rounding it to 2 decimal when there is more than 2.
>
> Here is where I’m at right now
> Running on a Raspberry Pi3b with weewx 4.10.2 with all the current version
> as of this date 10/15/2023.
>
>
> The weewx.conf is modified the following way:
>
> *[Engine]*
>
>
> # The following section specifies which services should be run and in
> what order.
>
> [[Services]]
>
> prep_services = weewx.engine.StdTimeSynch
>
> data_services = user.airlink.AirLink, user.AddTxt2Jpg.AddTxt2Jpg
>
> process_services = weewx.engine.StdConvert,
> weewx.engine.StdCalibrate, weewx.engine.StdQC,
> weewx.wxservices.StdWXCalculate, user.aprx.WeewxAprx
>
> xtype_services = weewx.wxxtypes.StdWXXTypes,
> weewx.wxxtypes.StdPressureCooker, weewx.wxxtypes.StdRainRater,
> weewx.wxxtypes.StdDelta
>
> archive_services = weewx.engine.StdArchive
>
> restful_services = weewx.restx.StdStationRegistry,
> weewx.restx.StdWunderground, weewx.restx.StdPWSweather,
> weewx.restx.StdCWOP, weewx.restx.StdWOW, weewx.restx.StdAWEKAS,
> user.mqtt.MQTT
>
> report_services = weewx.engine.StdPrint, weewx.engine.StdReport
>
> *[AddTxt2Jpg]*
>
> image_path = "/var/www/html/weewx/webcam/snap.jpg"
>
> output_path = "/var/www/html/weewx/webcam/snap_wx.jpg"
>
> font_path = "/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf"
>
> text_format = "Temperature: {outTemp}°C, Humidity: {outHumidity}%,
> Total rain:{rain24}, AQI: {pm2_5_aqi}"
>
> text_x = 50
>
> text_y = 1450
>
> text_color = white
>
> text_font_size = 36
>
> fields = "outTemp, outHumidity, pm2_5_aqi, windSpeed, barometer,
> rain24, windDir.ordinal_compass"
>
> Now the script itself which can be or is a complete mess looks like this:
>
> #!/usr/bin/python3
>
> import weewx
> from weewx.engine import StdService
> import weeutil.weeutil
> import syslog
> from weewx.units import convert, getStandardUnitType
>
> # Check for Pillow library installation
> try:
> from PIL import Image, ImageDraw, ImageFont
> except ImportError:
> syslog.syslog(syslog.LOG_ERR, "AddTxt2Jpg: Pillow library not found.
> Please install with 'pip install Pillow'.")
> exit(1)
>
> class AddTxt2Jpg(StdService):
> def __init__(self, engine, config_dict):
> super(AddTxt2Jpg, self).__init__(engine, config_dict)
>
> # Logging tag
> self.log_tag = "AddTxt2Jpg"
>
> # Get configuration options from weewx.conf
> self.image_path = config_dict.get('AddTxt2Jpg',
> {}).get('image_path', '')
> self.output_path = config_dict.get('AddTxt2Jpg',
> {}).get('output_path', '')
> self.font_path = config_dict.get('AddTxt2Jpg',
> {}).get('font_path', '')
> self.text_format = config_dict.get('AddTxt2Jpg',
> {}).get('text_format', 'Weather Data: {outTemp}°C, Humidity:
> {outHumidity}%')
> self.text_x = int(config_dict.get('AddTxt2Jpg', {}).get('text_x',
> '20'))
> self.text_y = int(config_dict.get('AddTxt2Jpg', {}).get('text_y',
> '20'))
> self.text_color = config_dict.get('AddTxt2Jpg',
> {}).get('text_color', 'white')
> self.text_font_size = int(config_dict.get('AddTxt2Jpg',
> {}).get('text_font_size', '20'))
>
> # Set up the converter
> target_unit_nickname = config_dict.get("StdConvert",
> {}).get("target_unit", "METRIC")
> target_unit =
> weewx.units.unit_constants[target_unit_nickname.upper()]
> self.converter = weewx.units.StdUnitConverters[target_unit]
>
> # Get the list of fields to be extracted from the archive record
> fields = config_dict.get('AddTxt2Jpg', {}).get('fields', [])
> if isinstance(fields, str):
> self.fields = [x.strip() for x in fields.split(',')]
> elif isinstance(fields, list):
> self.fields = fields
> else:
> self.fields = []
>
> # Bind to the new archive record event
> self.bind(weewx.NEW_ARCHIVE_RECORD, self.new_archive_record)
>
> syslog.syslog(syslog.LOG_INFO, f"{self.log_tag}: initialized.")
>
> def new_archive_record(self, event):
> syslog.syslog(syslog.LOG_INFO, f"{self.log_tag}: New archive
> record event triggered.")
>
> try:
> # Access the record containing the archived weather data
> record = event.record
>
> # Convert all fields to the desired unit system using the
> converter
> for field in self.fields:
> if field in record:
> value = record[field]
> std_unit_type, group =
> getStandardUnitType(record['usUnits'], field)
> value_converted = self.converter.convert((value,
> std_unit_type, group))
> record[field] = value_converted[0]
>
> # Extract fields from configuration
> field_values = {field: record.get(field) for field in
> self.fields}
>
> # Open the existing image
> image = Image.open(self.image_path)
>
> # Create a drawing context
> draw = ImageDraw.Draw(image)
>
> # Load the specified font
> font = ImageFont.truetype(self.font_path,
> size=self.text_font_size)
>
> # Format the text using weather data from the record
> formatted_text = self.text_format.format(**field_values)
>
> # Add the formatted text to the image
> draw.text((self.text_x, self.text_y), formatted_text,
> fill=self.text_color, font=font)
>
> # Save the modified image to the output path
> image.save(self.output_path)
>
> # Log a message to the system log
> syslog.syslog(syslog.LOG_INFO, f"{self.log_tag}: Text added to
> image and saved as {self.output_path}")
>
> except Exception as e:
> # Handle any exceptions and log them
> syslog.syslog(syslog.LOG_ERR, f"{self.log_tag}: Error:
> {str(e)}")
>
>
> How bad is it, I’m I far, can it be better coded (obviously YES) but is my
> first attempt any close.
> PS I never coded before, this was done just by reading other extension
> making the best of it with chatgpt.
>
> [image: snap_wx-3.jpeg]
>
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