dyomedea/src/components/trkseg/Trkseg.tsx

import { Component, createEffect, createSignal, onCleanup } from 'solid-js';

import dispatch, { cancelDispatch } from '../../workers/dispatcher-main';
import VectorSource from 'ol/source/Vector';
import GeoJSON from 'ol/format/GeoJSON';
import {
  createCachedSignal,
  destroyCachedSignal,
} from '../../workers/cached-signals';

interface Props {
  trksegId: string;
  vectorSource: VectorSource;
  context: any;
}

export const Trkseg: Component<Props> = ({
  vectorSource,
  trksegId,
  context,
}) => {
  const params = {
    id: trksegId,
    method: 'getTrkseg',
  };
  const trkseg = createCachedSignal(params);

  const clearFeatures = () => {
    [`${trksegId}/start`, trksegId, `${trksegId}/end`].forEach((id) => {
      const feature = vectorSource.getFeatureById(id);
      if (feature) {
        vectorSource.removeFeature(feature);
      }
    });
  };

  onCleanup(() => {
    console.log({
      caller: 'Trkseg / onCleanup',
      trksegId,
      trkseg: trkseg(),
      params,
    });
    destroyCachedSignal(params);
    clearFeatures();
  });

  createEffect(() => {
    console.log({ caller: 'Trkseg', vectorSource, trksegId, trkseg: trkseg() });

    if (trkseg()) {
      let geo: any = {
        type: 'FeatureCollection',
        features: [
          {
            type: 'Feature',
            geometry: {
              type: 'Point',
              coordinates: [trkseg().trkpt[0].$.lon, trkseg().trkpt[0].$.lat],
            },
            properties: {
              type: 'trkseg-start',
              id: trksegId,
              context: { ...context, trkseg, trksegId },
            },
            id: `${trksegId}/start`,
          },
          {
            type: 'Feature',
            geometry: {
              type: 'LineString',
              coordinates: trkseg().trkpt.map((trkpt: any) => [
                trkpt.$.lon,
                trkpt.$.lat,
              ]),
            },
            properties: {
              type: 'trkseg',
              id: trksegId,
              context: { ...context, trkseg, trksegId },
            },
            id: trksegId,
          },
          {
            type: 'Feature',
            geometry: {
              type: 'Point',
              coordinates: [
                trkseg().trkpt.at(-1).$.lon,
                trkseg().trkpt.at(-1).$.lat,
              ],
            },
            properties: {
              type: 'trkseg-finish',
              id: trksegId,
              context: { ...context, trkseg, trksegId },
            },
            id: `${trksegId}/end`,
          },
        ],
      };

      const features = new GeoJSON().readFeatures(geo);
      console.log({ caller: 'Trkseg', features });
      clearFeatures();
      vectorSource.addFeatures(features);
    }
  });

  return <></>;
};

export default Trkseg;