×
Namespaces

Variants
Actions
(Difference between revisions)

Change Marker based on zoom level in HERE Maps

From Nokia Developer Wiki
Jump to: navigation, search
jasfox (Talk | contribs)
m (Jasfox - Updated example to use Nokia Maps API 2.2)
jasfox (Talk | contribs)
m (Jasfox - formatting.)
Line 41: Line 41:
 
<html xmlns="http://www.w3.org/1999/xhtml">
 
<html xmlns="http://www.w3.org/1999/xhtml">
 
     <head>
 
     <head>
       <title>Circle</title>
+
       <title>Changing Marker on Zoom</title>
       <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+
       <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
       <script type="text/javascript"
+
       <script type="text/javascript" src="http://api.maps.nokia.com/2.2.0/jsl.js" charset="utf-8"></script>
            src="http://api.maps.nokia.com/2.2.0/jsl.js" charset="utf-8">
+
        </script>
+
 
     </head>
 
     </head>
 
     <body>
 
     <body>

Revision as of 16:29, 13 April 2012

This article shows how to control the display of map markers based on zoom level. This can be useful both to ensure that markers are not distorted as the map level changes, or indeed to ensure that those displayed are still relevant.

Article Metadata
Code Example
Source file: marker.html
Dependencies: Nokia Maps 2.1.0
Article
Keywords: Nokia Maps
Created: jackdenial (30 Dec 2011)
Last edited: jasfox (13 Apr 2012)


Adding map observer

In this code snippet, we are adding zoomLevel property of the map to monitor the zoom and we will change the marker accordingly.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Changing Marker on Zoom</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" src="http://api.maps.nokia.com/2.2.0/jsl.js" charset="utf-8"></script>
</head>
<body>
 
<div id="mapContainer" style="z-index: -1; left:0px; top:0px; width: 100%; height: 80%; position: absolute;"></div>
<script type="text/javascript">
/////////////////////////////////////////////////////////////////////////////////////
// Don't forget to set your API credentials
//
// Replace with your appId and token which you can obtain when you
// register on http://api.developer.nokia.com/
//
nokia.Settings.set( "appId", "YOUR APP ID GOES HERE");
nokia.Settings.set( "authenticationToken", "YOUR AUTHENTICATION TOKEN GOES HERE");
 
//
/////////////////////////////////////////////////////////////////////////////////////
 
// Get the DOM node to which we will append the map
var mapContainer = document.getElementById("mapContainer");
var map = new nokia.maps.map.Display(mapContainer, {
// Initial center and zoom level of the map
center: [52.51, 13.4],
zoomLevel: 3,
components: [
// ZoomBar provides an UI to zoom the map in & out
new nokia.maps.map.component.ZoomBar(),
// We add the behavior component to allow panning / zooming of the map
new nokia.maps.map.component.Behavior(),
// Creates UI to easily switch between street map satellite and terrain mapview modes
new nokia.maps.map.component.TypeSelector()
]
});
 
var la=52.51;
var lo=13.4;
var standardMarker = new nokia.maps.map.StandardMarker(new nokia.maps.geo.Coordinate(parseFloat(la), parseFloat(lo)));
var standardMarkerProps =
{
text: "42",
brush: {
color: "#F80"
}
};
 
map.objects.add(standardMarker);
 
var arrColor = ["#0C0101","#220202","#320303","#410505","#520707","#640909","#7A0C0C","#910F0F",
"#AB0E0E","#D21313","#FC1111","#9DA008","#F4F80E","#0EF82A","#6ADB78","#0C0101","#220202",
"#320303","#410505","#520707","#640909","#AB0E0E","#D21313","#FC1111","#9DA008"];
 
map.addObserver("zoomLevel",function(){
map.objects.clear();
standardMarkerProps.text = map.zoomLevel;
standardMarkerProps.brush.color = arrColor[map.zoomLevel];
map.objects.add(new nokia.maps.map.StandardMarker(
new nokia.maps.geo.Coordinate(parseFloat(la), parseFloat(lo)),
standardMarkerProps
));
});
 
</script>
</body>
</html>

Output

The output of the above code would look like below screenshot. Whenever you double click the map it will zoom in and the marker will show zoomLevel in the balloon and it's color will also get changed accordingly.

ZoomLevel.jpg

Demo

  • Double click to zoom-in
  • Double right-click to zoom-out

http://www.planmyroute.info/marker.html

212 page views in the last 30 days.
×