Setting default zoom level in OpenLayers

Question

With your help I was able get a shapefile from the CAD file of the previous question.

Now the next step is the display the shapefile in OpenLayers... I wrote the script but the map being displayed in the browser is way too small... I need help setting the default zoom level...

Can someone point me to an "simple" example that explains how to set the default zoom level?

The ones I've found a way to complicated...

Answer 1

The second argument to map.setCenter is a zoom.

  var map = new OpenLayers.Map("mapdiv");
  // add layers here
  map.setCenter(new OpenLayers.LonLat(yourlon, yourlat), 5);

If you want something more complex than that, you're probably going to need to share more details about what your map and setup currently look like. (Projection, base layer, etc.)

Answer 2

Exemples are complexes because the way it works is not that simple

Since Zoom level and resolution are linked together, it could be a good start for you to read about it on the wiki page : http://trac.osgeo.org/openlayers/wiki/SettingZoomLevels, then choose the best way to process for the project you're working on.

Answer 3

Another way to set extent like you want

-Zoom to the extent you desired

-Get your current bbox

currentBbox = map.getExtent().left + ","+ map.getExtent().bottom + "," + map.getExtent().right + "," + map.getExtent().top;

-Copy result you got from console below

console.log(currentBbox)

-Reuse the result you got by pasting it in map.zoomToExtent(new OpenLayers.Bounds(stringYouCopy));

So in your case, do in firebug console

map.zoomToExtent(new OpenLayers.Bounds(-1.395751953125, -2.051635742188, 11.787841796875, 10.582641601562));

If it's ok, you can add the code to your Openlayers application

Reusing "Christopher Schmidt" advice with map.setCenter, to get the right informations

-Zoom to the place you want

-To get lon

map.center.lon

-To get lat

map.center.lat

-To get zoom

map.zoom

It's up to you to complete (easy now)

Answer 4

Another option would be to zoom to the extent of your map using map.zoomToExtent(layer.getExtent())

Answer 5

Pretty easy, bigger the value, bigger the zoom:

map.getView().setZoom(8);