[OSM-dev] how to make a line with OpenLayers

[Christoph Boehme]

Oh, I forgot to mention: the openlayers users mailing list [1] is
probably a much better place to ask questions like yours about
openlayers.

	Christoph

[1] http://openlayers.org/mailman/listinfo/users

Christoph Boehme <christoph at b3e.net> wrote:
> Hi Ahmed,
> 
> > I would like to know how to make a line with openLayres and  display
> > it on the map,
> > I have of course the coordinates of the 2 extreme points ( lat and
> > lon).
> 
> that's quite simple:
> 
> 1. Create a vector layer:
> 
> var lineLayer = new OpenLayers.Layer.Vector('Line Layer');
> map.addLayer(lineLayer);  // Assuming that map is your map object
> 
> 2. Create a LineString geometry object with the end points of your
> line:
> 
> var points = new Array(
>     new OpenLayers.Geometry.Point(lon1, lat1),
>     new OpenLayers.Geometry.Point(lon2, lat2)
> );
> var line = new OpenLayers.Geometry.LineString(points); 
> 
> 3. Transform the LineString into the map projection:
> 
> var defaultProj = new OpenLayers.Projection('EPSG:4326');
> line = line.transform(defaultProj, map.getProjectionObject());
> 
> 4. Define a style for your line:
> 
> var style = {
>     strokeColor: '#0000ff', 
>     strokeOpacity: 0.5,
>     strokeWidth: 5
> };
> 
> 5. Create a vector feature with the LineString geometry:
> 
> lineFeature = new OpenLayers.Feature.Vector(line, null, style);
> 
> 6. Add the feature to the vector layer:
> 
> lineLayer.addFeatures([lineFeature]);
> 
> On http://www.mappa-mercia.org/birmingham-half-marathon/ you find an
> example that draws a number of lines to display a running course on
> top of a map. Except for the javascript array with the coordinates
> the code is embedded directly into the html file.
> 
> The documentation on http://docs.openlayers.org/ and the API reference
> on http://dev.openlayers.org/apidocs/ are also very helpful.
> 
> 	Cheers,
> 	Christoph
> 
> ahmed soua <ahmed.soua at gmail.com> wrote:
> > Hi all,
> > I would like to know how to make a line with openLayres and  display
> > it on the map,
> > I have of course the coordinates of the 2 extreme points ( lat and
> > lon).
> > 
> > Thanks
> > 
> > -- 
> > Le bonheur est comme l'écho : il vous répond : mais il ne vient pas.
> > 
> 
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