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HERE Maps API - Find a USA state (simple game on map utilizing reverse geocoding)

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Revision as of 02:49, 2 January 2012

A simple map game demonstrating how to used reverse geocoding in Nokia Maps

Article Metadata
Compatibility
Platform(s): Web browser
Article
Created: (31 Dec 2011)
Updated: avnee.nathani (31 Dec 2011)
Last edited: hamishwillee (02 Jan 2012)

Contents

Introduction

This simple game will introduce how to use the map Event listener for user map clicks, how to find the geocoordinates under the clicked mouse point and how to further use the coordinates to perform a reverse geocode search - all this in a form of a guessing game.

Feel free to further implement your version of this!

Prerequisites

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

The example assumes you have already added the Nokia Maps to your web page as explained in the previous article "Nokia Maps - add the map to any web page"

Important about Maps credentials

Nokia provides several services options within the Maps API offering. The service is free to use, but if you complete the free registration process and obtain authentication and authorization credentials, your application will have priority access to the service and will thus avoid a potential performance penalty. Please read the Location API Business Models and Usage Restrictions page to decide which business model best fits your needs. Authentication requires unique Maps API credentials, namely an AppId and a token. You can get these credentials from the Nokia Developer API Registration page.

In the code example below is all required HTML and embedded JavaScript, a full functional application.

Game code

<html>
<head>
<title>Nokia Maps game - Locate the states of USA</title>
<script type="text/javascript"
src="http://api.maps.nokia.com/2.0.0/jsl.js" charset="utf-8">
</script>
</head>
<body onload="init()">
<div id="map" style="z-index: -1; left:0px; top:0px; width: 100%; height: 100%; position: absolute;"></div>
<script type="text/javascript">
 
//Globals
 
var clicked_location = "";
var myContainer;
var searchManager;
var clicked_country;
var clicked_state;
var map;
var statesArray = ["Alabama","Alaska","Arizona","Arkansas","California","Colorado","Connecticut","Delaware","District of Columbia","Florida","Georgia","Hawaii","Idaho","Illinois","Indiana","Iowa","Kansas","Kentucky","Louisiana","Maine","Marshall Islands","Maryland", "Massachusetts","Michigan","Minnesota","Mississippi","Missouri","Montana","Nebraska","Nevada","New Hampshire","New Jersey","New Mexico","New York","North Dakota","North Carolina","Ohio","Oklahoma","Oregon","Pennsylvania", "Rhode Island","South Carolina","South Dakota","Tennessee","Texas","Utah","Vermont","Virginia","Washington","West Virginia","Wisconsin","Wyoming"];
var stateAbbrev = ["AL","AK","AZ","AR","CA","CO","CT","DE","DC","FL","GA","HI","ID","IL","IN","IA","KS","KY","LA","ME","MH","MD","MA","MI","MN","MS","MO","MT","NE","NV","NH","NJ","NM","NY","ND","NC","OH","OK","OR","PA",
"RI", "SC", "SD", "TN", "TX", "UT", "VT","VI","WA","WV","WI","WY"]
 
var correct_answers = 0;
var wrong_answers = 0;
var randomnumber=Math.floor(Math.random()*51);
 
function random_State()
{
randomnumber=Math.floor(Math.random()*51);
alert("DOUBLE CLICK WHERE YOU THINK IS : "+statesArray[randomnumber]);
}
 
 
function init()
{
 
alert("Hello! Welcome to the game. Click OK to start.");
 
// Set the authentication token, which is needed by the web-services to authenticate your application.
nokia.maps.util.ApplicationContext.set("authenticationToken", "<Token>");
 
 
//map = new nokia.maps.map.Display(document.getElementById("map"), {'zoomLevel':4, 'center':[39.8, 98.57]});
map = new nokia.maps.map.Display(document.getElementById("map"),
{
components: [ new nokia.maps.map.component.Behavior(),
new nokia.maps.map.component.ZoomBar(),
new nokia.maps.map.component.Overview(),
new nokia.maps.map.component.TypeSelector(),
new nokia.maps.map.component.ScaleBar()],
'zoomLevel': 5,
'center':[48.166667, -100.166667] // Geographical center of the USA
 
});
 
map.removeComponent(map.getComponentById("zoom.DoubleClick"));
//This will remove the default functionality on the map, where double clicking on it would zoom the map. We need
//to do this to prevent that the user doubleclick would only be registered by the game and not zooming the map.
//We would like to keep the default zoom level. The user will still have the possibility to zoom the map with the
//mouse scroll wheel.
 
map.addListener("dblclick", eventListener); // add the listener for mouse click
 
map.set("baseMapType", map.NORMAL);
 
random_State();
 
function eventListener(event){
console.log("in EventListener");
event.preventDefault();
clicked_location = map.pixelToGeo(event.displayX, event.displayY);
console.log(clicked_location.toString());
console.log("Adding a Marker there");
add_Marker_where_clicked();
}
 
}
 
function add_Marker_where_clicked(){
myMarker = new nokia.maps.map.Marker(clicked_location);
map.objects.add(myMarker);
mapStartReverseGeoCode();
}
 
function mapStartReverseGeoCode(){
 
searchManager = new nokia.maps.search.Manager();
searchManager.addObserver("state",
function(observedManager, key, value) {
if(value == "finished") {
if (observedManager.locations.length > 0) {
console.log("SEARCH ENDED SUCCESSFULLY");
console.log(observedManager.locations[0].address.country);
clicked_country = observedManager.locations[0].address.country;
console.log(clicked_country);
clicked_state = observedManager.locations[0].address.state;
console.log(clicked_state);
clicked_county = observedManager.locations[0].address.county;
console.log(clicked_county);
clicked_district = observedManager.locations[0].address.district;
console.log(clicked_district);
show_results();
 
}
} else if(value == "failed") {
alert("SEARCH FAILED");
}
});
 
console.log("Reverse geocoding: "+clicked_location.toString());
searchManager.reverseGeocode(clicked_location);
 
}
function show_results(){
 
// alert("YOU HAD SELECTED: "+clicked_state+" "+clicked_country);
 
if (stateAbbrev[randomnumber] == clicked_state)
{
correct_answers += 1;
alert("That was CORRECT! You got 1 point"+" Correct ones: "+correct_answers+" "+"Wrong ones:"+wrong_answers);
}
else
{
wrong_answers += 1;
alert("That was WRONG! You got 1 point"+" Correct ones: "+correct_answers+" "+"Wrong ones:"+wrong_answers);
}
 
random_State();
 
}
 
 
</script>
</body>
</html>

For more on Nokia Maps API

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

You may also access the interactive Nokia Maps API playground,

Tested on

  • Google Chrome 11.0x
  • Mozilla Firefox 5.0
194 page views in the last 30 days.

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