[OpenLayers-Users] Add Point to Map

[Alexandre Dube]

Christopher,

  Look at the following example [1].  It should helps you a lot.  (click 
on the small pencil to add a point).

  See also this article [2] about spherical mercator.

Kind regards,

Alexandre

[1] http://openlayers.org/dev/examples/spherical-mercator.html
[2] http://docs.openlayers.org/library/spherical_mercator.html

Jones, Christopher wrote:
>
> Hi all,
>
>  
>
> Im fairly new to OpenLayers and  javascript for that matter as well.  
> Having looked extensively through all the various examples and forums 
> and blogs, and one or 2 tutorials, I am still struggling to add a 
> point to a map (or a vector layer)!  All I want, is to click on a map 
> and adda a point.  Heres my code, please feel free to point all the 
> errors you want!
>
>  
>
> Thanks in advance!
>
>  
>
> Chris
>
> (Sorry if this has been sent twice)
>
>  
>
>  
>
> var myStyles = new OpenLayers.StyleMap({
>
>     "default": new OpenLayers.Style({
>
>         fillColor: "#ffcc66",
>
>         strokeColor: "#ff9933",
>
>         strokeWidth: 10
>
>     })
>
> });
>
>  
>
> function initialiseMap(){
>
>         map = new OpenLayers.Map('map');
>
>         map.addControl(new OpenLayers.Control.LayerSwitcher());
>
>         var gphy = new OpenLayers.Layer.Google(
>
>                 "Google Physical",
>
>                 { type: G_PHYSICAL_MAP }
>
>             );
>
>         var gmap = new OpenLayers.Layer.Google(
>
>                 "Google Streets",
>
>                 {numZoomLevels: 20 }
>
>             );
>
>         var ghyb = new OpenLayers.Layer.Google(
>
>                 "Google Hybrid",
>
>                 { type: G_HYBRID_MAP, numZoomLevels: 20 }
>
>             );
>
>         var gsat = new OpenLayers.Layer.Google(
>
>                 "Google Satellite",
>
>                 { type: G_SATELLITE_MAP, numZoomLevels: 20 }
>
>             );
>
>                 map.addLayers([gphy, gmap, ghyb, gsat]);
>
>                 map.setCenter(new OpenLayers.LonLat(-74.0094, 
> 40.7048), 5);
>
>                 map.addControl(new OpenLayers.Control.PanZoomBar());
>
>                 map.addControl(new OpenLayers.Control.MousePosition());
>
> }
>
>  
>
>  
>
>  
>
> function singleClickButton() {
>
>     document.getElementById("map").childNodes[0].style.cursor = 
> "crosshair";
>
>     map.events.register('click', '', singleClickEvent);
>
>  
>
> }
>
>  
>
> function singleClickEvent (e) {
>
>     var lonlat = map.getLonLatFromViewPortPx(e.xy);
>
>     var lon = lonlat.lon
>
>     var lat = lonlat.lat
>
>  
>
>     var pointLayer = new OpenLayers.Layer.Vector('Points', { styleMap: 
> myStyles });
>
>     map.addLayers([pointLayer]);
>
>     var bPoint = new OpenLayers.Geometry.Point(lon , lat)
>
>     newpoint = new OpenLayers.Feature.Vector(bPoint);
>
>     pointLayer.addFeatures(newpoint);
>
>    
>
> }
>
>  
>
>  
>
>  
>
>  
>
>  
>
>  
>
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-- 
Alexandre Dubé
Mapgears
www.mapgears.com