An elegant way to find shortest and fastest route in Google Maps API v3?

Question

I am making a taxi fare calculator. One of the business requirements is that, the company wants the shortest and fastest route options. I know Google directionService by def

Answer 1

See http://codepen.io/jasonmayes/pen/DupCH.

var shortestDistance = function() {  
    var directionsDisplay;
    var directionsService = new google.maps.DirectionsService();
    var map;
    var size = 0;
    var currentPosition;

    // An array of interesting places we want to potentially visit.
    var interestingPlaces = [
    {'title': 'Regents Park', 'latLng': new google.maps.LatLng(51.530686, -0.154753)},
    {'title': 'Hyde Park', 'latLng': new google.maps.LatLng(51.507293, -0.164022)},
    {'title': 'Green Park', 'latLng': new google.maps.LatLng(51.504088, -0.141706)},
    {'title': 'Regents Park', 'latLng': new google.maps.LatLng(51.479185, -0.159903)}
    ];

    // An array to store results from Google routing API.
    var routeResults = [];


    // Call this upon page load to set everything in motion!
    function initialize(currentLat, currentLng) {
    currentPosition = new google.maps.LatLng(currentLat, currentLng);
    directionsDisplay = new google.maps.DirectionsRenderer();
    var mapOptions = {
        zoom: 13,
        center: currentPosition
    };
    map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
    directionsDisplay.setMap(map);

    var marker = new google.maps.Marker({
            position: currentPosition,
            map: map,
            title: 'Currrently location.'
    });

    var i = interestingPlaces.length;
        while (i--) {
        interestingPlaces[i].marker = new google.maps.Marker({
        position: interestingPlaces[i].latLng,
        map: map,
        title: interestingPlaces[i].title,
        icon: 'http://maps.google.com/mapfiles/ms/icons/green.png'
        });
    }

    findNearestPlace();
    }


    // Loops through all inteesting places to calculate route between our current position
    // and that place.
    function findNearestPlace() {
    var i = interestingPlaces.length;
    size = interestingPlaces.length;
    routeResults = [];
    while (i--) {
        calcRoute(interestingPlaces[i].latLng, storeResult);
    }
    }


    // A function to calculate the route between our current position and some desired end point.
    function calcRoute(end, callback) {
    var request = {
        origin: currentPosition,
        destination: end,
        travelMode: google.maps.TravelMode.DRIVING
    };
    directionsService.route(request, function(response, status) {
        if (status == google.maps.DirectionsStatus.OK) {
        callback(response);
        } else {
        size--;
        }
    });
    }


    // Stores a routing result from the API in our global array for routes.
    function storeResult(data) {
    routeResults.push(data);
    if (routeResults.length === size) {
        findShortest();
    }
    }


    // Goes through all routes stored and finds which one is the shortest. It then
    // sets the shortest route on the map for the user to see.
    function findShortest() {
    var i = routeResults.length;
    var shortestIndex = 0;
    var shortestLength = routeResults[0].routes[0].legs[0].distance.value;

    while (i--) {
        if (routeResults[i].routes[0].legs[0].distance.value < shortestLength) {
        shortestIndex = i;
        shortestLength = routeResults[i].routes[0].legs[0].distance.value;
        }
    }
    directionsDisplay.setDirections(routeResults[shortestIndex]);
    }

    // Expose the initialize function publicly as "init".
    return {
    init: initialize
    };
}();

// Upon page load, lets start the process!
google.maps.event.addDomListener(window, 'load', shortestDistance.init(51.489554, -0.12969));

DISCLAIMER

THIS IS NOT MY PEN!!! I AM JUST REFERRING TO A USEFUL RESOURCE THAT MIGHT HELP