[OpenLayers-Users] Two displayProjections on a map

[Jan Hartmann]

Found the answer myself: the MousePosition control has a property 
"formatOutput", with which you can define a function having one 
parameter (lonlat, the value of the MousePosition), and returning a 
string with which to replace this value. No exta layouting needed.

Jan

On 01/10/2013 03:48 PM, Jan Hartmann wrote:
> Yes, this is the difficult solution. It works, but I was thinking in 
> another direction. As Bart pointed out, it is possible to put multiple 
> Mouseposition controls with different DisplayProjections on a page by 
> means css classes. This means that I can influence the position of 
> these controls and their projected coordinate values without any other 
> formating. However, I would also like to be able to change to format 
> of a lon-lat value to degrees-minutes-seconds. Is there a way to get 
> at the numeric value of a MousePosition control and alter it?
>
> There are other possibilities for this. Older maps often have national 
> central meridians, like Paris, Amsterdam, Djakarta. To see the 
> lon-values on those map in Greenwich values, all lon values need to be 
> added with a constant. It would be nice if that could be done 
> automatically via the MousePointer control.
>
> Jan
>
> On 1/10/2013 2:46 PM, Richard Greenwood wrote:
>> On Thu, Jan 10, 2013 at 6:02 AM, Jan Hartmann <j.l.h.hartmann at uva.nl 
>> <mailto:j.l.h.hartmann at uva.nl>> wrote:
>>
>>     Hi Rich, how did you get the lon-lat values on your map
>>     formattted as degrees/minutes/seconds (next to the default
>>     decimal degrees?)
>>
>>
>> Hey Jan -
>>
>> The hardest part was getting the coordinates to be the same width so 
>> that they did not cause other page elements to move. Without that the 
>> display was quite "jittery". My code is below. I'm using my original 
>> CSCS transformation library, not proj4js, but that shouldn't matter.
>>
>> Best regards,
>> Rich
>>
>> rwg.cursorCoords = function(e) {
>>
>>   var position = this.events.getMousePosition(e);
>>   var pointXY = this.getLonLatFromPixel(position); /* this has a 
>> transform method */
>>   var p = new CSCS.PT <http://CSCS.PT>(pointXY.lon, pointXY.lat);
>>   var text;
>>
>>   /* *** Private functions ***************** */
>>   var zeroPad2 = function(num) {
>>     num += '';
>>     return (num.length<2) ? "0"+num : num;
>>   };
>>
>>   var zeroPad4 = function(num) {
>>     num += '';
>>     return (num.length<4) ? "0"+num : num;
>>   };
>>
>>   var dd2dms = function(v) {
>>     var fv = v % 1;     // fractional part
>>     var d = v - fv;     // integer part (degrees)
>>     fv = Math.abs(fv);
>>     var m = fv * 60;    // minutes
>>     var mf = m % 1;     // fractional part of minutes
>>     var mi = m - mf;    // integer part of minutes
>>     var s = Math.round(mf*600)/10;  // seconds
>>     s = s.toFixed(1);
>>     return  d + "° " + zeroPad2(mi) + "' "+ zeroPad4(s) 
>> + """;
>>   };
>>
>>   // display original state plane coords
>>   text = "N: " + Math.round(p.y) + " E: " + Math.round(p.x);
>>   OpenLayers.Util.getElement("coords").innerHTML = text;
>>
>>   // convert to long/lat and display
>>   CSCS.transform(csSP, csLL, p);
>>
>>   text = "<table cellpadding=\"0\" cellspacing=\"0\"><tr><td>";
>>   text += "Long: " + dd2dms(p.x) + "</td><td> Lat: " + 
>> dd2dms(p.y);
>>   text += "</td></tr><tr><td>Long: " + 
>> Math.round(p.x*10000)/10000 + "°</td><td> Lat: " + 
>> Math.round(p.y*10000)/10000;
>>   text += "°</td></tr></table>";
>>
>>   OpenLayers.Util.getElement("coordsLL").innerHTML = text;
>>
>>   // convert long/lat to UTM and display
>>   CSCS.transform(csLL, csUTM, p);
>>   text = "X =" + Math.round(p.x) + " Y = " + Math.round(p.y);
>>   OpenLayers.Util.getElement("coordsUTM").innerHTML = text;
>>
>> };
>>
>>
>>
>>
>>
>> -- 
>> Richard Greenwood
>> richard.greenwood at gmail.com <mailto:richard.greenwood at gmail.com>
>> www.greenwoodmap.com <http://www.greenwoodmap.com>
>
>
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