HERE Maps API - How to create custom graphics marker
Contents |
Introduction
In this article we will examine how to create a custom marker with using the GFX library. In the example we will create a transparent ellipse, which the user can drag around the map.
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
We will create a map with the set of basic user controls, and center the map with a zoom level. The testLayer refers to a new map Container we create. We then add the container to the map objects and graphicsContext variable will have an instance of the GFX library Graphics object.
Example code
<html>
<head>
<script src="http://api.maps.ovi.com/jsl.js" type="text/javascript" charset="utf-8">
</script>
<link rel="stylesheet" href="style.css" />
</head>
<div id="map" style="width:100%; height:80%;"></div>
<body style = "width:80%; height:80%;">
</div>
</body>
<script type="text/javascript">
var map = new ovi.mapsapi.map.Display(document.getElementById("map"), // new instance of Ovi Maps
{
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': 8,
'center':[-33.9417, 150.9473]
});
map.set("baseMapType", map.NORMAL);
// Create a test layer
var testLayer = new ovi.mapsapi.map.Container();
map.objects.add(testLayer);
var graphicsContext = new ovi.mapsapi.gfx.Graphics();
graphicsContext.beginImage(64,64);
// Compress a semi-transparent red color
var my_fill_color = ovi.mapsapi.gfx.Color.compress(255, 0, 0, 127);
graphicsContext.set("fillColor", my_fill_color);
graphicsContext.set("strokeColor", "#000");
graphicsContext.set("lineWidth", 4);
graphicsContext.drawEllipse(1, 1, 48, 48);
graphicsContext.fill();
graphicsContext.stroke();
var myGfxMarker = new ovi.mapsapi.map.Marker(
{latitude:-33.9417, longitude:150.9473},
{
icon: new ovi.mapsapi.gfx.GraphicsImage(graphicsContext.getIDL()),
visibility: true,
anchor: new ovi.mapsapi.util.Point(0,0),
draggable: true
}
);
testLayer.objects.add(myGfxMarker);
</script>
</body>
</html>
For more on Ovi Maps API
Please check out the Ovi Maps API full documentation and API reference here:
Tested with
Google Chrome 11.0x
Mozilla Firefox 5.0
