rename files

website/src/lib/components/toolbar/tools/routing/simplify.ts

@@ -0,0 +1,45 @@
+import { ramerDouglasPeucker, type GPXFile, type TrackSegment } from 'gpx';
+
+const earthRadius = 6371008.8;
+
+export function getZoomLevelForDistance(latitude: number, distance?: number): number {
+    if (distance === undefined) {
+        return 0;
+    }
+
+    const rad = Math.PI / 180;
+    const lat = latitude * rad;
+
+    return Math.min(22, Math.max(0, Math.log2((earthRadius * Math.cos(lat)) / distance)));
+}
+
+export function updateAnchorPoints(file: GPXFile) {
+    let segments = file.getSegments();
+
+    for (let segment of segments) {
+        if (!segment._data.anchors) {
+            // New segment, compute anchor points for it
+            computeAnchorPoints(segment);
+            continue;
+        }
+
+        if (segment.trkpt.length > 0) {
+            // Ensure first and last points are anchors and always visible
+            segment.trkpt[0]._data.anchor = true;
+            segment.trkpt[0]._data.zoom = 0;
+            segment.trkpt[segment.trkpt.length - 1]._data.anchor = true;
+            segment.trkpt[segment.trkpt.length - 1]._data.zoom = 0;
+        }
+    }
+}
+
+function computeAnchorPoints(segment: TrackSegment) {
+    let points = segment.trkpt;
+    let anchors = ramerDouglasPeucker(points, 1);
+    anchors.forEach((anchor) => {
+        let point = anchor.point;
+        point._data.anchor = true;
+        point._data.zoom = getZoomLevelForDistance(point.getLatitude(), anchor.distance);
+    });
+    segment._data.anchors = true;
+}