[OpenLayers-Users] OpenLayers.DOTS_PER_INCH as global setting seems shouldn't be changed just for only mapguide layer while other layers added together

[Paul Spencer]

Hi Carl,

I think this should only be done if MapGuide is the base layer, if it  
is used as an overlay then the DPI probably shouldn't be changed.  I  
think it would be useful to be able to specify per-layer DPI values  
and have added a ticket (http://trac.openlayers.org/ticket/1768) to  
OpenLayers trac to open up a discussion on this.  The implementation  
should not be difficult but there may be implications that I am not  
aware of.

Cheers

Paul

On 7-Oct-08, at 11:57 AM, Carl wrote:

>
>
> From Openlayers document, it can be found:
>
> MapGuide OS uses a DPI value and degrees to meters conversion
> factor that are different than the defaults used in OpenLayers, so  
> these
> must be adjusted accordingly in  your application.  See the MapGuide  
> example
> for how to set these values for MGOS.
>
> From mapguide.html, it can be found:
>
>       var metersPerUnit = 111319.4908;  //value returned from mapguide
>        var inPerUnit = OpenLayers.INCHES_PER_UNIT.m * metersPerUnit;
>        OpenLayers.INCHES_PER_UNIT["dd"] = inPerUnit;
>        OpenLayers.INCHES_PER_UNIT["degrees"] = inPerUnit;
>        OpenLayers.DOTS_PER_INCH = 96;
>
> it seems both OpenLayers.INCHES_PER_UNIT and  
> OpenLayers.DOTS_PER_INCH are
> global settings.
>
> I doubt if two different layers, such as WMS and MapGuide are added to
> Openlayers Map, the above settings will influence both layers. but  
> it seems
> the settings shouldn't be changed for WMS?
>
> ??
> -- 
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