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Revision as of 13:25, 31 December 2011 by avnee.nathani (Talk | contribs)

HERE Maps API - How to pan the map

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This article explains how to use the panning method on the map.

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

Contents

Introduction

This article contains an example that you can use to study how the Nokia Maps API handles panning of the map. Feel free to modify and utilize whole or partial for your own purposes!

Prerequistites

Nokia Maps API supported web browser (basically any modern browser should do).

Example code

This example will start panning the map to the right, then after a moment changes direction to the left and continues forever(?) ;) Unless you stop it by pressing the button and clearing the timer and interval settings.

<script type="text/javascript">
 
//Globals
 
var myInterval = 0;
 
var myTimer;
 
 
var map_start_x = 100;
var map_start_y = 100;
var map_end_x = 120;
var map_end_y = 100;
 
var myMap;
 
if (document.addEventListener)
document.addEventListener("DOMContentLoaded", all_is_ready, false);
 
 
function all_is_ready(){
 
alert("Click OK to start the panning.");
 
myMap = 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: 3,
center: [19.119, 72.8957]
 
});
 
timerLauncher();
 
}
function timerLauncher()
{
// Start the timer
myInterval = setInterval ("panTheMap()", 1000);
}
 
function panTheMap()
{
map_start_x = map_start_x + 1;
map_start_y = map_start_y + 1;
map_end_x = map_end_x - 1;
map_end_y = map_end_y + 1;
 
document.getElementById("showCoords").innerHTML = "("+map_start_x+","+map_start_y+","+map_end_x+","+map_end_y+")";
 
myMap.pan(map_start_x, map_start_y, map_end_x, map_end_y);
 
myTimer = setTimeout ('document.getElementById("showCoords").innerHTML = ""', 500);
}
 
function stopPanning()
{
clearTimeout(myTimer);
clearInterval(myInterval);
alert("Timer and interval cleared. Example finished. Reload page to run again.");
 
}
</script>
<html>
<head>
<script type="text/javascript"
src="http://api.maps.nokia.com/2.0.0/jsl.js" charset="utf-8">
</script>
</head>
<body>
<center>
<div id="map" style="width:80%; height:80%;"></div>
<div id="showCoords" style="height: 2.0em; font-size: 2em; color: blue;"></div>
<FORM>
<INPUT type="button" value="STOP panning" name="button6" onClick="stopPanning()">
</FORM>
</center>
</body>
</html>

Screenshot

NokiaMapsPanning.png

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,

Summary

Using the map panning feature you could create e.g. a game, where the map is moving and the user should e.g. find something on the map and click it before the area vanishes from sight, just an idea ;) develop your own =)? Side scrolling game...? =)

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