app/assets/javascripts/index/directions/fossgis_valhalla.js

   1 (function () {
   2   function FOSSGISValhallaEngine(modeId, costing) {
   3     const INSTR_MAP = [
   4       "straight", // kNone = 0;
   5       "start", // kStart = 1;
   6       "start", // kStartRight = 2;
   7       "start", // kStartLeft = 3;
   8       "destination", // kDestination = 4;
   9       "destination", // kDestinationRight = 5;
  10       "destination", // kDestinationLeft = 6;
  11       "straight", // kBecomes = 7;
  12       "straight", // kContinue = 8;
  13       "slight-right", // kSlightRight = 9;
  14       "right", // kRight = 10;
  15       "sharp-right", // kSharpRight = 11;
  16       "u-turn-right", // kUturnRight = 12;
  17       "u-turn-left", // kUturnLeft = 13;
  18       "sharp-left", // kSharpLeft = 14;
  19       "left", // kLeft = 15;
  20       "slight-left", // kSlightLeft = 16;
  21       "straight", // kRampStraight = 17;
  22       "exit-right", // kRampRight = 18;
  23       "exit-left", // kRampLeft = 19;
  24       "exit-right", // kExitRight = 20;
  25       "exit-left", // kExitLeft = 21;
  26       "straight", // kStayStraight = 22;
  27       "slight-right", // kStayRight = 23;
  28       "slight-left", // kStayLeft = 24;
  29       "merge-left", // kMerge = 25;
  30       "roundabout", // kRoundaboutEnter = 26;
  31       "roundabout", // kRoundaboutExit = 27;
  32       "ferry", // kFerryEnter = 28;
  33       "straight", // kFerryExit = 29;
  34       null, // kTransit = 30;
  35       null, // kTransitTransfer = 31;
  36       null, // kTransitRemainOn = 32;
  37       null, // kTransitConnectionStart = 33;
  38       null, // kTransitConnectionTransfer = 34;
  39       null, // kTransitConnectionDestination = 35;
  40       null, // kPostTransitConnectionDestination = 36;
  41       "merge-right", // kMergeRight = 37;
  42       "merge-left" // kMergeLeft = 38;
  43     ];
  44
  45     function _processDirections(tripLegs) {
  46       let line = [];
  47       let steps = [];
  48       let distance = 0;
  49       let time = 0;
  50
  51       for (const leg of tripLegs) {
  52         const legLine = L.PolylineUtil.decode(leg.shape, {
  53           precision: 6
  54         });
  55
  56         const legSteps = leg.maneuvers.map(function (manoeuvre, idx) {
  57           const num = `<b>${idx + 1}.</b> `;
  58           const lineseg = legLine
  59             .slice(manoeuvre.begin_shape_index, manoeuvre.end_shape_index + 1)
  60             .map(([lat, lng]) => ({ lat, lng }));
  61           return [
  62             lineseg[0],
  63             INSTR_MAP[manoeuvre.type],
  64             num + manoeuvre.instruction,
  65             manoeuvre.length * 1000,
  66             lineseg
  67           ];
  68         });
  69
  70         line = line.concat(legLine);
  71         steps = steps.concat(legSteps);
  72         distance += leg.summary.length;
  73         time += leg.summary.time;
  74       }
  75
  76       return {
  77         line: line,
  78         steps: steps,
  79         distance: distance * 1000,
  80         time: time
  81       };
  82     }
  83
  84     return {
  85       mode: modeId,
  86       provider: "fossgis_valhalla",
  87       creditline:
  88       "<a href='https://gis-ops.com/global-open-valhalla-server-online/' target='_blank'>Valhalla (FOSSGIS)</a>",
  89       draggable: false,
  90
  91       getRoute: function (points, signal) {
  92         const query = new URLSearchParams({
  93           json: JSON.stringify({
  94             locations: points.map(function (p) {
  95               return { lat: p.lat, lon: p.lng, radius: 5 };
  96             }),
  97             costing: costing,
  98             directions_options: {
  99               units: "km",
 100               language: OSM.i18n.locale
 101             }
 102           })
 103         });
 104         return fetch(OSM.FOSSGIS_VALHALLA_URL + "?" + query, { signal })
 105           .then(response => response.json())
 106           .then(({ trip }) => {
 107             if (trip.status !== 0) throw new Error();
 108             return _processDirections(trip.legs);
 109           });
 110       }
 111     };
 112   }
 113
 114   OSM.Directions.addEngine(new FOSSGISValhallaEngine("car", "auto"), true);
 115   OSM.Directions.addEngine(new FOSSGISValhallaEngine("bicycle", "bicycle"), true);
 116   OSM.Directions.addEngine(new FOSSGISValhallaEngine("foot", "pedestrian"), true);
 117 }());