Plot Data with future Timestamps

[cmikovits]

I am quite new to ha and also this card. As far as I understood HA and also this card only plot values with time entries in the past. Now I have a sensor (epex_spot) with values also one day ahead which I would love to plot. Can anyone pinpoint me how to accomplish that?

https://github.com/mampfes/ha_epex_spot

With apex charts this was accomplished with:

data_generator: > return entity.attributes.data.map((entry, index) => { return [new Date(entry.start_time).getTime(), entry.price_eur_per_mwh];}).slice(parseInt(hass.states['sensor.epex_start_low_period'].state.substring(0,2)),parseInt(hass.states['sensor.epex_start_low_period'].state.substring(0,2))+4);

[dbuezas]

This one should get you started #213

[cmikovits]

Thx for the hint. I already read through this, but I am unsure about how to apply the whole fn stuff.
Also, my sensor has the values in one attribute. Is it even possible with data like that?

[dbuezas]

Yes it is possible, the example I linked above also has the future data inside one attribute.

[cmikovits]

ok, can you please pinnpoint me to this entry. I see the one with the meta.forecast from openweather. I am really unfamiliar on how to translate this term to the one I need.

[dbuezas]

This section may help you: https://github.com/dbuezas/lovelace-plotly-graph-card?tab=readme-ov-file#debugging

As a starting point try:

entities:
  - entity: ''
    name: custom thing
    filter: 
      fn: |
        ({meta, hass}) => ({
           xs: meta.data.map((entry, index) => new Date(entry.start_time).getTime()),
           ys: meta.data.map((entry, index) => entry.price_eur_per_mwh];}).slice(parseInt(hass.states['sensor.epex_start_low_period'].state.substring(0,2)),parseInt(hass.states['sensor.epex_start_low_period'].state.substring(0,2))+4);
         })