MapGuide Tips -- how to limit the scaling range of MapGuide Ajax Viewer

 

During MapGuide-based development, have you ever encountered such a requirement? My map only needs to be enlarged to a certain extent, so it cannot be enlarged without limit. It cannot be scaled out without limit, because I care about it, it doesn't make any sense to narrow down without limit. Well, since the customer said so, how should we implement it?

MapGuide does not provide corresponding APIs, but fortunately, MapGuide is open-source. We can change the source code. Open C: \ Program Files \ Autodesk \ MapGuideEnterprise2010 \ WebServerExtensions \ www \ viewerfiles \ ajaxmappane. templ in notepad or your favorite text editor. The code is roughly in line 328 and is as follows:

Var minScale = 0.001, maxScale = 1000000000000;

Modify the corresponding minScale and maxScale to your appropriate value. Try it! J

 

However, you need to be aware that this is a change to the MapGuide source file, so it will be applied to all MapGuide applications on this site.

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OK, Stay Tuned!