[OpenLayers-Users] Add Point to Map

[Drew Toto]

A while back I did this for a prototype using something similar to this
code, hope it helps.

map.events.register("click", map, function(e) {
    var position = this.events.getMousePosition(e);
    var point = map.getLonLatFromPixel(position);
    //create point and add to layer
});

Also, as somebody else pointed out, definitely read up on
spherical-mercator on the OpenLayers site if you haven't already.

http://docs.openlayers.org/library/spherical_mercator.html

-----Original Message-----
From: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org]
On Behalf Of Jones, Christopher
Sent: Friday, November 13, 2009 5:05 AM
To: users at openlayers.org
Subject: [OpenLayers-Users] Add Point to Map

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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