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Displaying inundation maps as geojson polygon layer
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| import { memo, useEffect } from 'react'; | ||
| import { Layer, Source } from 'react-map-gl/maplibre'; | ||
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| import { useDispatch, useSelector } from 'react-redux'; | ||
| import { GeojsonDataLayerProps, LegendDefinition } from 'config/types'; | ||
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| import { LayerData, loadLayerData } from 'context/layers/layer-data'; | ||
| import { layerDataSelector } from 'context/mapStateSlice/selectors'; | ||
| import { getLayerMapId } from 'utils/map-utils'; | ||
| import { opacitySelector } from 'context/opacityStateSlice'; | ||
| import { FillLayerSpecification } from 'maplibre-gl'; | ||
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| const paintProps: ( | ||
| legend: LegendDefinition, | ||
| opacity: number | undefined, | ||
| ) => FillLayerSpecification['paint'] = ( | ||
| legend: LegendDefinition, | ||
| opacity?: number, | ||
| ) => ({ | ||
| 'fill-opacity': opacity || 1, | ||
| 'fill-color': { | ||
| property: 'level', | ||
| type: 'categorical', | ||
| stops: legend.map(({ value, color }) => [value, color]), | ||
| }, | ||
| }); | ||
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|
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| // Polygon Data, takes any GeoJSON of polygons and shows it. | ||
| const GeojsonDataLayer = memo(({ layer, before }: LayersProps) => { | ||
| const dispatch = useDispatch(); | ||
| const layerId = getLayerMapId(layer.id); | ||
| const opacityState = useSelector(opacitySelector(layer.id)); | ||
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| const layerData = useSelector(layerDataSelector(layer.id)) as | ||
| | LayerData<GeojsonDataLayerProps> | ||
| | undefined; | ||
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| const { data } = layerData || {}; | ||
|
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| useEffect(() => { | ||
| dispatch(loadLayerData({ layer })); | ||
| }, [dispatch, layer]); | ||
|
|
||
| return ( | ||
| <Source data={data} type="geojson"> | ||
| <Layer | ||
| beforeId={before} | ||
| id={layerId} | ||
| type="fill" | ||
| paint={paintProps(layer.legend || [], opacityState || layer.opacity)} | ||
| /> | ||
| </Source> | ||
| ); | ||
| }); | ||
|
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| export interface LayersProps { | ||
| layer: GeojsonDataLayerProps; | ||
| before?: string; | ||
| } | ||
|
|
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| export default GeojsonDataLayer; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| import GeoJSON from 'geojson'; | ||
| import { GeojsonDataLayerProps } from 'config/types'; | ||
| import { queryParamsToString } from 'utils/url-utils'; | ||
| import { fetchWithTimeout } from 'utils/fetch-with-timeout'; | ||
| import { HTTPError } from 'utils/error-utils'; | ||
| import { setUserAuthGlobal } from 'context/serverStateSlice'; | ||
| import type { LazyLoader } from './layer-data'; | ||
|
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| export const fetchGeojsonLayerData: LazyLoader<GeojsonDataLayerProps> = | ||
| () => | ||
| async ({ layer: { data: dataUrl, additionalQueryParams } }, { dispatch }) => { | ||
| const requestUrl = `${dataUrl}${ | ||
| dataUrl.includes('?') ? '&' : '?' | ||
| }&${queryParamsToString(additionalQueryParams)}`; | ||
| let data; | ||
| let response: Response; | ||
| // TODO - Better error handling, esp. for unauthorized requests. | ||
| try { | ||
| // eslint-disable-next-line fp/no-mutation | ||
| response = await fetchWithTimeout( | ||
| requestUrl, | ||
| dispatch, | ||
| { | ||
| mode: 'cors', | ||
| }, | ||
| `Request failed for fetching point layer data at ${requestUrl}`, | ||
| ); | ||
| // eslint-disable-next-line fp/no-mutation | ||
| data = (await response.json()) as GeoJSON.FeatureCollection; | ||
| } catch (error) { | ||
| if ((error as HTTPError)?.statusCode === 401) { | ||
| dispatch(setUserAuthGlobal(undefined)); | ||
| } | ||
| throw error; | ||
| } | ||
|
|
||
| return data as any as GeoJSON.FeatureCollection; | ||
| }; |
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