[mapserver-users] Fwd: imgxy

[Vu Pham]

Steve Lime wrote:

> 
> ------------------------------------------------------------------------
> 
> Subject:
> 
> imgxy
> From:
> 
> orkun <temiz at deprem.gov.tr>
> Date:
> 
> Fri, 22 Mar 2002 16:58:59 +0200
> To:
> 
> steve.lime at dnr.state.mn.us
> 
> 
> Hi
> 
> I couldn't locate the maps at the center of the view when I performed 
> zooming, although
> I manipulated imgxy. (But I don't know the logic of imgxy in depth. )
> 
> How can I solve this problem ?
> Would you give some hints ?
> 
> Thanks in advance
> 


Let me try to answer your question [ I just got it answered yesterday :-) ]
When you don't click on the map itself , e.g. you click on the 
submit-type button of the form, then imgxy will be used as the center 
point for zooming.
If the map size if X and Y, and imgxy will be "X/2-1  Y/2-1 " ( perhaps 
X/2 -0.5 and Y/2 -0.5 is more exactly ).

For example, my img size is 220 300 ( well, it loads it on my pocket pc 
), then my form has this line :
<input type="hidden" name="imgxy" value="109 149">

( When you click on the map then img.x and img.y will be used )

HTH,

Vu