set zoom level one more than a given extent

JorgeFiallega

Currently I have a handle on a polygon and I set the extent of the map by doing
map.setExtent(polygon.getExtent(), true);

I would like to be able to move out one more level from the given extent. Meaning from the result of the setExtent operation above.

I guess I could pseudocode  so something like

1. map.setExtent(polygon.getExtent(), true);
2. extentDoneCallBack(map.setLevel(map.getLevel() + 1));

making use of the deferred call back of the setExtent action.

Would this be the correct approach. It does not look right to me.

JorgeFiallega

So the couple of lines of code look like this

        map.setExtent(polygon.getExtent(), true).then(function(){
          map.setLevel(map.getLevel() - 1)
        } );

The problem that I have is that visually so see it zooming in and then zooming out one level.
What I need is to calculate what level the extent would be , and only then set the level on the map to level -1.

The question is if is there any way to know what level a polygon would be displayed, without setting anything on the map, and then just set the level - 1.