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HERE Maps API - How to calculate a route between two points

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Ovi Maps API supported web browser (basically any modern web browser)
 
Ovi Maps API supported web browser (basically any modern web browser)
 
The example assumes you have already added the Ovi Maps to your web page as explained in the previous article "Ovi Maps - add the map to any web page"
 
  
 
==Important about Maps credentials==
 
==Important about Maps credentials==

Revision as of 15:32, 21 June 2011

Contents

Introduction

In this article we will study on how to calculate the Route between two selected points on the map, providing that a valid route can be found in all.

Prerequisites

Ovi Maps API supported web browser (basically any modern web browser)

Important about Maps credentials

With Ovi Maps API you can start without having any credentials given, but you might face a performance gap. In order to get the full potential out of the offering, you must get the credentials that authenticate your application against the Services. Please read through the Location API.

For more information on how to obtain the credentials, please start with the Ovi Maps API Developers Guide section "Acquiring API credentials"

Implementation

In this example we will define two waypoints for the route; the geographical location of Berlin, Germany to the one of Paris, France. To be able to use the routing we need to initialize a new Routing Manager. We will cast the waypoints to it with some additional parameters. We want the "shortest" route with "car" and no fee roads with "avoidTollroad" plus having the trafficMode set to "default".

Example code

This example has all the required HTML and JavaScript code to perform the routing.

<html>
<head>
<script src="http://api.maps.ovi.com/jsl.js" type="text/javascript" charset="utf-8"></script>
</head>
<div id="map" style="width:100%; height:80%;"></div>
<body>
</div>
</body>
<script type="text/javascript">
 
// Global variables
 
var map; // Instance of Ovi Maps Display
var router; // New Route search
var geoloc; // New Geocoding search
 
//Define waypoints for the Routing
var waypoints = new ovi.mapsapi.routing.WaypointParameterList();
waypoints.addCoordinate( new ovi.mapsapi.geo.Coordinate(52.500556, 13.398889)); // Berlin, Germany
waypoints.addCoordinate( new ovi.mapsapi.geo.Coordinate(48.856667, 2.350833)); // Paris, France
 
//Define Routing parameters
 
var modes = [{
type: "shortest",
transportModes: ["car"],
options: "avoidTollroad",
trafficMode: "default"
}];
 
 
map = new ovi.mapsapi.map.Display(document.getElementById("map"),
{
 
components: [ new ovi.mapsapi.map.component.Behavior(),
new ovi.mapsapi.map.component.ZoomBar(),
new ovi.mapsapi.map.component.Overview(),
new ovi.mapsapi.map.component.TypeSelector(),
new ovi.mapsapi.map.component.ScaleBar()],
'zoomLevel': 3,
});
 
 
router = new ovi.mapsapi.routing.Manager(); //create a route manager
// map.addListener("dblclick", eventListener);
 
//onRouteCalculated will be called when a route was calculated
var onRouteCalculated = function(observedRouter, key, value){
if (value == "finished") {
var routes = observedRouter.getRoutes();
 
//create the default map representation of a route
var mapRoute = new ovi.mapsapi.routing.component.RouteResultSet(routes[0]).container; //first option found
map.objects.add(mapRoute);
 
//Zoom to the bounding box of the route
map.zoomTo(mapRoute.getBoundingBox(), false, "default");
} else if(value == "failed") {
alert("The routing request failed.");
}
};
 
//add the observer function to the router's "state" property
router.addObserver("state", onRouteCalculated);
 
 
//calculate the route (and call onRouteCalculated afterwards)
router.calculateRoute(waypoints, modes);
 
</script>
</html>


For more on Ovi Maps API

Please check out the Ovi Maps API full documentation and API reference here:

http://api.maps.ovi.com

Tested with

Google Chrome 11.0x Mozilla Firefox 5.0

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