86 lines
3.5 KiB
TypeScript
86 lines
3.5 KiB
TypeScript
import LayerConfig from "../../Customizations/JSON/LayerConfig";
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import FeatureSource from "./FeatureSource";
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import {UIEventSource} from "../UIEventSource";
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import {GeoOperations} from "../GeoOperations";
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/**
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* The no overlap source takes a featureSource and applies a filter on it.
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* First, it'll figure out for each feature to which layer it belongs
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* Then, it'll check any feature of any 'lower' layer
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*/
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export default class NoOverlapSource {
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features: UIEventSource<{ feature: any, freshness: Date }[]> = new UIEventSource<{ feature: any, freshness: Date }[]>([]);
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constructor(layers: {
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layerDef: LayerConfig
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}[],
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upstream: FeatureSource) {
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const layerDict = {};
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let noOverlapRemoval = true;
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const layerIds = []
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for (const layer of layers) {
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layerDict[layer.layerDef.id] = layer;
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layerIds.push(layer.layerDef.id);
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if ((layer.layerDef.hideUnderlayingFeaturesMinPercentage ?? 0) !== 0) {
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noOverlapRemoval = false;
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}
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}
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if (noOverlapRemoval) {
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this.features = upstream.features;
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return;
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}
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this.features = upstream.features.map(
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features => {
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if (features === undefined) {
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return;
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}
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// There is overlap removal active
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// We partition all the features with their respective layerIDs
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const partitions = {};
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for (const layerId of layerIds) {
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partitions[layerId] = []
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}
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for (const feature of features) {
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partitions[feature.feature._matching_layer_id].push(feature);
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}
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// With this partitioning in hand, we run over every layer and remove every underlying feature if needed
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for (let i = 0; i < layerIds.length; i++) {
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let layerId = layerIds[i];
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const percentage = layerDict[layerId].layerDef.hideUnderlayingFeaturesMinPercentage ?? 0;
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if (percentage === 0) {
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// We don't have to remove underlying features!
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continue;
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}
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const guardPartition = partitions[layerId];
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for (let j = i + 1; j < layerIds.length; j++) {
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let layerJd = layerIds[j];
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let partitionToShrink: { feature: any, freshness: Date }[] = partitions[layerJd];
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let newPartition = [];
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for (const mightBeDeleted of partitionToShrink) {
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const doesOverlap = GeoOperations.featureIsContainedInAny(
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mightBeDeleted.feature,
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guardPartition.map(f => f.feature),
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percentage
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);
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if(!doesOverlap){
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newPartition.push(mightBeDeleted);
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}
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}
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partitions[layerJd] = newPartition;
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}
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}
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// At last, we create the actual new features
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let newFeatures: { feature: any, freshness: Date }[] = [];
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for (const layerId of layerIds) {
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newFeatures = newFeatures.concat(partitions[layerId]);
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}
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return newFeatures;
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});
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}
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} |