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Maurice
73237ffedb
The tour type is a dropdown; a bike tour picks its profile, routes for it, says when a point lies off every way, and shows what it runs on: surfaces, kinds of way and, for a mountain bike, the trail grades, each pointed at on the map. A type's own map (OpenHikingMap for a hike, CyclOSM for a bike tour) is offered while a tour of that type is open, with an admin switch each. From the planned cards: a hike avoids steep climbs, steps or ferries, nothing else; a saved tour can be shared where the platform takes GPX files; and the tours rail adds a tour from one menu: plan new, import GPX, or take one over from another trip.
24 lines
818 B
TypeScript
24 lines
818 B
TypeScript
/** The router's line as it sends it: Google's polyline encoding at the given precision. */
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export function encodePolyline(points: [number, number][], precision: number): string {
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const factor = 10 ** precision;
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let last = [0, 0];
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return points
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.map((point) => {
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const scaled = point.map((value) => Math.round(value * factor));
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const deltas = scaled.map((value, i) => value - last[i]);
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last = scaled;
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return deltas
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.map((delta) => {
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let value = delta < 0 ? ~(delta << 1) : delta << 1;
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let chunk = '';
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while (value >= 0x20) {
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chunk += String.fromCharCode((0x20 | (value & 0x1f)) + 63);
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value >>= 5;
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}
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return chunk + String.fromCharCode(value + 63);
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})
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.join('');
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})
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.join('');
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}
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