[mapguide-users] AJAX viewer zoom slider

[Jason Birch]

Thanks Alain.

Should I be placing this in an onload handler for the main frame, or is
there an event that fires when the map is initialized that I can respond
to?  The developer guide seems to be focussed mostly on interacting with
the task frame; I couldn't figure it out from that.

Jason


-----Original Message-----
From: Alain Lebatard [mailto:alain.lebatard at autodesk.com] 
Sent: Friday, April 07, 2006 09:39
To: users at mapguide.osgeo.org
Subject: RE: [mapguide-users] AJAX viewer zoom slider

Jason,

You can workaround this for now by setting the 'scales' array to a new
value after the map is initialized. For example this will change the
slider to zoom between scales 1:2000 and roughly 1:300000

    scales = new Array();
    scale = 2000;
    for(var i=0; i < 20; i++) {
        scales[i] = scale;
        scale *= 1.3;
    }

    mapFrame.scales = scales;

You're free to define the number of scales in the array to make the
slider smoother and to define the increment between scales.

Alain

-----Original Message-----
From: Jason Birch [mailto:Jason.Birch at nanaimo.ca]
Sent: Friday, April 07, 2006 8:12 AM
To: users at mapguide.osgeo.org
Subject: [mapguide-users] AJAX viewer zoom slider

Is it just me, or does having a zoom slider where the top 1/3 is
dedicated to scales greater than 1:1 not make any sense?  This appears
to be the case in the maps that I have made that don't have base layers.
 
The slider function itself appears to use a pretty good algorithm to
zoom progressively, but I think that it might be more useful if:
 - It was integer-based, and/or
 - It was possible to specify min/max scales for a given map
 
I put in a defect report for this a while back:
https://mapguide.osgeo.org/servlets/Scarab?id=MG146
 
In the meantime, can anyone suggest a workaround?
 
Thanks,
Jason

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