[mapserver-users] Restricting zooms into a map

[Armin Burger]

Thorsten,

you could use the map file setting

WEB
  ..
  MINSCALE 25000
  ..
END #Web

I'm only working with he cgi version but it should work also for the PHP
one, I suppose.

armin

> Ladies and gentlemappers,

> Using php mapscript, i want to keep users from zooming deeper into a map
> than to a certain scale; say, 25000 for this example. I think the proper
> to do this is to perform the zoom, then checking the scale and if the
> scale does not match what I want, I am zooming out again.

> So I do the following (zooms etc. are done with zoomPoint() in my app,
> which works fine):


> $map -> zoomPoint ($factor, $point, $X, $Y, $rect, $map -> extent);

> if ($map -> scale < 25000) {
>   $map -> zoomScale (25000, $point, $X, $Y, $rect, $map -> extent);
> }


> Unfortunately, calling zoomScale() does not change anything. Are things
> done using buffering in some way, i.e. do I have to 'flush' changes
> before I do another zoom?


> cheers,

> thorsten

> --

> Thorsten Fischer        thfischer at mapmedia.de

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