[fusion-users] min/max Zoom scales

[Måns Beckman]

Hi All, 

 

First I'm just going to tell you that I'm not really a programmer, I'm more of a script kiddie, so bare with me.

 

The thing is that we got a customer that wants to limit how close the user can zoom in to the map. So I started to have a look and found out that there was something that made the map not zoom in closer than the scale 1:1. So I started do look in the code for what was preventing this, but I didn't find anything in the zoom widgets or in the zoom functions in Map.js. So I started to think there was something in openlayers that made it impossible to zoom in more. 

 

Ok, so eventually I found out that we can send some options when we initialize the open layers map, and I guess that 1:1 is the default value. http://trac.openlayers.org/wiki/SettingZoomLevels

 

So I looked in the code for where we initialize an open layer map and found something on line 98 (this is MGE2009 so the exact lines might have changed). Anyway I thought that I would try to send some more options to the map and changed line 94 from

var options = {controls: [], fallThrough: true};

to

var options = {controls: [], fallThrough: true, minScale: 10000};

 

When I reload my map it initializes on scale 1:10000, I can zoom in but not out. I try to change minScale to maxScale, to make the opposite happen. But when I do that, nothing happens in the map, it works like I had sent no extra option at all.

 

So, could someone explain this behavior? And could someone tell me how to solve my problem without using fixed zoomscales?

 

Best regards

Måns

 

-----------------------------------------------------------

Måns Beckman

Man and Machine

Fabriksgatan 13

412 50 Göteborg

Phone: +46 31 - 762 8182

Mobile: +46 733 - 38 83 19

 

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