More refactoring

Logic/FeatureSource/Actors/SaveFeatureSourceToLocalStorage.ts

@@ -1,12 +1,4 @@
-import FeatureSource, { Tiled } from "../FeatureSource"
-import { Tiles } from "../../../Models/TileRange"
-import { IdbLocalStorage } from "../../Web/IdbLocalStorage"
-import { UIEventSource } from "../../UIEventSource"
-import LayerConfig from "../../../Models/ThemeConfig/LayerConfig"
-import { BBox } from "../../BBox"
-import SimpleFeatureSource from "../Sources/SimpleFeatureSource"
-import FilteredLayer from "../../../Models/FilteredLayer"
-import Loc from "../../../Models/Loc"
+import FeatureSource from "../FeatureSource"
 import { Feature } from "geojson"
 import TileLocalStorage from "./TileLocalStorage"
 import { GeoOperations } from "../../GeoOperations"

Logic/FeatureSource/Sources/SimpleFeatureSource.ts

@@ -1,7 +1,6 @@
 import { UIEventSource } from "../../UIEventSource"
 import FilteredLayer from "../../../Models/FilteredLayer"
-import { FeatureSourceForLayer, Tiled } from "../FeatureSource"
-import { BBox } from "../../BBox"
+import { FeatureSourceForLayer } from "../FeatureSource"
 import { Feature } from "geojson"
 
 export default class SimpleFeatureSource implements FeatureSourceForLayer {

Logic/FeatureSource/Sources/SnappingFeatureSource.ts

@@ -0,0 +1,52 @@
+import FeatureSource from "../FeatureSource"
+import { Store } from "../../UIEventSource"
+import { Feature, Point } from "geojson"
+import { GeoOperations } from "../../GeoOperations"
+
+export interface SnappingOptions {
+    /**
+     * If the distance is bigger then this amount, don't snap.
+     * In meter
+     */
+    maxDistance?: number
+}
+
+export default class SnappingFeatureSource implements FeatureSource {
+    public readonly features: Store<Feature<Point>[]>
+
+    constructor(
+        snapTo: FeatureSource,
+        location: Store<{ lon: number; lat: number }>,
+        options?: SnappingOptions
+    ) {
+        const simplifiedFeatures = snapTo.features.mapD((features) =>
+            features
+                .filter((feature) => feature.geometry.type !== "Point")
+                .map((f) => GeoOperations.forceLineString(<any>f))
+        )
+
+        location.mapD(
+            ({ lon, lat }) => {
+                const features = snapTo.features.data
+                const loc: [number, number] = [lon, lat]
+                const maxDistance = (options?.maxDistance ?? 1000) * 1000
+                let bestSnap: Feature<Point, { "snapped-to": string; dist: number }> = undefined
+                for (const feature of features) {
+                    const snapped = GeoOperations.nearestPoint(<any>feature, loc)
+                    if (snapped.properties.dist > maxDistance) {
+                        continue
+                    }
+                    if (
+                        bestSnap === undefined ||
+                        bestSnap.properties.dist > snapped.properties.dist
+                    ) {
+                        snapped.properties["snapped-to"] = feature.properties.id
+                        bestSnap = <any>snapped
+                    }
+                }
+                return bestSnap
+            },
+            [snapTo.features]
+        )
+    }
+}

Logic/FeatureSource/Sources/TouchesBboxFeatureSource.ts

@@ -2,7 +2,6 @@ import FeatureSource, { FeatureSourceForLayer } from "../FeatureSource"
 import StaticFeatureSource from "./StaticFeatureSource"
 import { GeoOperations } from "../../GeoOperations"
 import { BBox } from "../../BBox"
-import exp from "constants"
 import FilteredLayer from "../../../Models/FilteredLayer"
 
 /**