[OpenLayers-Users] non-zooming overviewmap

[Tim Schaub]

Hey-

> how can I get the overviewmap to not zoom in or out? Is this 
> possible using certain values for minRatio and maxRatio? I 
> couldn't figure it out ...

You can get at this in a number of ways.  Just as you could limit the number
of zoom levels of a regular map, you can limit the number of zoom levels of
your overview map's map:

  var options = {mapOptions: {numZoomLevels: 1}};
  map.addControl(OpenLayers.Control.OverviewMap(options));

Note that in this case you might want to use an image layer for your
overview map's base layer.  This also requires the latest from SVN (or just
update OverviewMap.js [1]).

You can also hack the min/max ratios:

  var options = {minRatio: 0, maxRatio: Number.POSITIVE_INFINITY};
  map.addControl(new OpenLayers.Control.OverviewMap(options));

But this isn't really as safe as making the isSuitableOverview function
always return true:

  var options = {isSuitableOverview: function() {return true;}};
  map.addControl(new OpenLayers.Control.OverviewMap(options));
  
The first is really the best way.  I've updated the wiki to show this
example.

Tim


[1]
http://trac.openlayers.org/browser/trunk/openlayers/lib/OpenLayers/Control/O
verviewMap.js?format=raw

[2] http://trac.openlayers.org/wiki/Control/OverviewMap


> 
> For now I always return true in the isSuitableOverview 
> function, but that's just a hack.
> 
> Thanks in advance.
> 
> Best regards,
> Bart
>