80 lines
2.5 KiB
JavaScript
80 lines
2.5 KiB
JavaScript
(function () {
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function GraphHopperEngine(modeId, vehicleType) {
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const GH_INSTR_MAP = {
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"-3": "sharp-left",
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"-2": "left",
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"-1": "slight-left",
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"0": "straight",
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"1": "slight-right",
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"2": "right",
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"3": "sharp-right",
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"4": "destination", // finish reached
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"5": "destination", // via reached
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"6": "roundabout",
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"-7": "fork-left",
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"7": "fork-right",
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"-98": "u-turn-left", // unknown direction u-turn
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"-8": "u-turn-left", // left u-turn
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"8": "u-turn-right" // right u-turn
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};
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function _processDirections(path) {
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const line = L.PolylineUtil.decode(path.points);
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const steps = path.instructions.map(function (instr, i) {
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const num = `<b>${i + 1}.</b> `;
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const lineseg = line
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.slice(instr.interval[0], instr.interval[1] + 1)
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.map(([lat, lng]) => ({ lat, lng }));
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return [
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lineseg[0],
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GH_INSTR_MAP[instr.sign],
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num + instr.text,
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instr.distance,
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lineseg
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]; // TODO does graphhopper map instructions onto line indices?
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});
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steps.at(-1)[1] = "destination";
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return {
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line: line,
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steps: steps,
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distance: path.distance,
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time: path.time / 1000,
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ascend: path.ascend,
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descend: path.descend
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};
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}
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return {
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mode: modeId,
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provider: "graphhopper",
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creditline: "<a href=\"https://www.graphhopper.com/\" target=\"_blank\">GraphHopper</a>",
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draggable: false,
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getRoute: function (points, signal) {
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// GraphHopper Directions API documentation
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// https://graphhopper.com/api/1/docs/routing/
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const query = new URLSearchParams({
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vehicle: vehicleType,
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locale: I18n.currentLocale(),
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key: "LijBPDQGfu7Iiq80w3HzwB4RUDJbMbhs6BU0dEnn",
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elevation: false,
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instructions: true,
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turn_costs: vehicleType === "car"
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});
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points.forEach(p => query.append("point", p.lat + "," + p.lng));
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return fetch(OSM.GRAPHHOPPER_URL + "?" + query, { signal })
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.then(response => response.json())
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.then(({ paths }) => {
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if (!paths || paths.length === 0) throw new Error();
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return _processDirections(paths[0]);
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});
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}
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};
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}
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OSM.Directions.addEngine(new GraphHopperEngine("car", "car"), true);
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OSM.Directions.addEngine(new GraphHopperEngine("bicycle", "bike"), true);
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OSM.Directions.addEngine(new GraphHopperEngine("foot", "foot"), true);
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}());
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