Thanks for input - it's done.
this.setBounds=function(b){
this.normalize();
//the setbounds should be a mathematical formula and not
guessing around.
//if you know this formula pease add it here.
//this.getSize();
var p1=b.getSW();
var p2=b.getNE();
var minlat=p1.getLat();
var maxlat=p2.getLat();
var minlng=p1.getLng();
var maxlng=p2.getLng();
var minlat360=lat2y(minlat);
var maxlat360=lat2y(maxlat);
var centerLng=(minlng+maxlng)/2;
var centerLat360=(minlat360 + maxlat360)/2;
var centerLat=y2lat(centerLat360);
var center=new kPoint(centerLat,centerLng);
var extendX=Math.abs(maxlat360 - minlat360);
var extendY=Math.abs(maxlng - minlng);
if(extendX / this.width < extendY / this.height){
var extend=extendX;
var screensize=this.width;
}else{
var extend=extendY;
var screensize=this.height;
}
//alert(extend);
//zoomlevel 1: 512 pixel
//zoomlevel 2: 1024 pixel
//...
//extend = 360 > zoomlevel 1 , at 512px screen
//extend = 360 > zoomlevel 2 , at 1024px screen
//extend at zoomlevel1: extend/360 * 512px
var scalarZoom=360/extend;
var screenfaktor= 512/screensize;
var zoom=(Math.log(scalarZoom /
screenfaktor))/(Math.log(2)) ;
if(zoom > 18){
zoom=18;
}
if(zoom < 1){
zoom=1;
}
this.setCenter2(center,zoom);
}
Iván Sánchez Ortega schrieb:
> El 22/03/2010 4:20, Bernhard zwischenbrugger escribió:
>> Given:
>> wgs84: minlat, minlon, maxlat, maxlon
>> screen: width, height
>>
>> Needed:
>> lat,lng, center
>
> http://trac.openlayers.org/browser/trunk/openlayers/lib/OpenLayers/Control/ZoomBox.js
>
>
>
>
> Cheers,
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