[OpenLayers-Users] OverviewMapControl config tips?

[cmose]

Tim,
Thanks much - I thought that might be the case but I *believe* I tried that
before (e.g., giving my TileCache config a higher maxResolution then my map
instance.) I seem to recall that not working the last time I attempted it
but I'll give it a shot again. It's quite possible I was monkeying around
with other things at the time and they were the sticky wicket.


Tim Schaub wrote:
> 
> Hey-
> 
> cmose wrote:
>> My map is configured with the following options:
>> var mapOptions = {
>>     minExtent: new OpenLayers.Bounds(-1,-1,1,1),
>>     maxExtent: new OpenLayers.Bounds(-180,-90,180,90),
>>     restrictedExtent: new OpenLayers.Bounds(-180,-90,180,90),
>>     maxResolution: 0.17578125,
>>     numZoomLevels: 8,
>>     buffer:1
>> }
>> 
>> and my OverviewMapControl is configured with these options:
>> var overviewMapOptions = {
>>     mapOptions: {
>>         maxResolution: 0.17578125,
>>         numZoomLevels: 8
>>     }
>> }
>> 
> 
> The extent rectangle on the overview map represents the extent of your 
> main map.  If the resolution of your main map equals the resolution of 
> your overview map, then the extent rectangle is trying to be as large 
> (pixel dimension) as your main map viewport.  Assuming your overview map 
> is smaller than your main map, this means the extent rectangle is trying 
> to be bigger than the overview map.
> 
> You need to configure your overview map to display resolutions *greater* 
> than your main map (more map units per pixel, smaller scale).  You can 
> accomplish this in one of two ways:
> 
> 1) decrease the maxResolution of your main map, or
> 2) increase the maxResolution of your overview map (through the 
> mapOptions property of the control)
> 
> The latter may require increasing the max resolution in your TileCache 
> config as well.
> 
> Make sense?
> Tim
> 
>> (please forgive any typos as this was hand transcribed - the actual
>> config
>> is free of typos and works fine with my current TileCache setup).
>> 
>> The issue I have is that the OverviewMapControl is basically useless from
>> zoom levels 0-3 - the red "extent" rectangle just fills the entire
>> OverviewMapControl and can't actually be used to drag the map more then a
>> very minuscule amount. I've looked over the js file but I think I'm just
>> having a poor comprehension day as I'm not seeing what I can change to
>> try
>> and alleviate this.
>> 
>> Ideally the draggable rectangle would stay constant size regardless of
>> the
>> zoom level of the overviewmap/bounds of the "main" map.
>> 
>> Anyone have any hints/tips as to how I can accomplish this or at least
>> provide a useable overviewmap at zoom levels 0-3?
>> 
>> Thanks!
> 
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