How to get vector feature information (distance and extent ) on OpenLayers

Question

I have basic WMS layer and vector layer in openlayers. Using EditingToolbar i can draw some features as shown below

Then I want to get some information (like distance and extent) of drawn features in any format.At the movement I stuck on above point. Pls give me some tips or sample code or some links.

Thanks for your valuable time

Answer 1

you can get vector layer extent:

vector.getDataExtent();

for getting features:

vector.features;

for getting first feature geometry:

vector.features[0].geometry.x
vector.features[0].geometry.y

for getting centroid of your first feature:

vector.features[0].geometry.getCentroid();

for getting first feature coordinate as string:

vector.features[0].geometry.toString();

for getting distance one point to another (it cant give geodetic result):

var p1 =   new OpenLayers.Geometry.Point(10,20);
var p2 =   new OpenLayers.Geometry.Point(30,40);

var distance = p1.distanceTo(p2)

i hope it helps you...

Answer 2

Use a SelectFeature control, and listen to featureselected events on the layer. The listener can use event.feature.geometry.getArea() to get the selected polygon's area, for example.