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website/src/lib/logic/selection-statistics.ts

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+import { writable } from 'svelte/store';
+import { engine, type GlobalStatistics } from '$lib/engine';
+
+/** The part of the selection that is highlighted in the elevation profile. */
+export type SlicedStatistics = {
+    /** Statistics of the part. */
+    global: GlobalStatistics;
+    /** Indices of its first and last trackpoints in the statistics of the selection. */
+    start: number;
+    end: number;
+};
+
+export const slicedStatistics = writable<SlicedStatistics | undefined>(undefined);
+
+// the indices only make sense for the selection they were made on
+engine.statistics.subscribe(() => slicedStatistics.set(undefined));