[mapserver-users] Zoom & imgxy

[Stephen Woodbridge]

Vu,

It is to fact the mapserver into thinking you get a click on the map
when in fact you clicked the submit button. Those constant coords are
the center of a 600x600 image so the map zooms in about the center. If
you click it will zoom in about the point where you clicked.

-Steve W.

Vu Pham wrote:
> 
> Hi all,
> 
> I am confused at zoom and imgxy.
> 
> In my app if I set zoom mode and click on the map, then zoom works well.
> But if I click on button Submit ( with Zoom mode is still on ) then the
> map is not zoomed.
> 
> I look into demo.html of the mapdemo, it has the following line:
> 
> <input type="hidden" name="imgxy" value="299.5 299.5">
> 
> If I delete this line, then setting Zoom in and clicking Refresh does
> not zoom the map.
> But if I click on the map itself, then the zoom function works.
> 
> This makes me thing that the value imgxy must play some important role
> in this case. But why the demo always set it to a constant ?
> 
> Thanks in advance,
> 
> Vu