[ka-Map-users] Re: Ka-Map Spatial Bookmark / Link to View

[Paul Spencer]

Peter,

did you figure this out?  I haven't had a chance to look at it (and  
probably won't until at least next week)

Cheers

Paul

On 21-Sep-05, at 5:16 PM, Peter Giencke wrote:

> All,
>
> I'm working on a spatial bookmark/'link to view' function (similar  
> to what
> google is doing) so that a user can follow a link to get to a  
> 'saved' extent
> with certain layers enabled/disabled.
>
> I'm having a problem accessing the current map through oMap in  
> zoomToExtent
> function while loading the linkified ka-map instance: "oMap has no
> properties."
>
> Below is the pseudocode, followed by the real code for this. My ka-map
> testcase for this is here: http://mds.glc.org/kamap_final/htdocs/
>
> Any help/insight/etc into this would be appreciated.....
>
> -pete
>
> //Pseudo
>
> User clicks a button to linkify location (as seen on maps.google.com)
>  Get extents
>   Get selected Layers
>    Create query string of extents + layers
>     [re]load ka-map with query string (QS)
>
> Ka-Map loads
>  'Notice' QS pairs
>   Parses out QS params
>    Zooms to extent given through QS
>     *Todo turn on selected layers
>
> //Real
>
>  function spatialBookmark()  //activated through a link on the main  
> ka-map
> page
> {
>   var a = myKaMap.getGeoExtents();
>   var vLayers = getVisibleLayer();
>   var oMap = myKaMap.getCurrentMap();
>   var aLayers = oMap.getLayers();
>   stringToPass = String(document.location.href) + "?minx=" + a[0] +  
> "&miny"
> + a[1] + "&maxx=" + a[2] + "&maxy=" + a[3] + "&layers=" + aLayers;
>   window.location = stringToPass;
> }
>
>
> function initialiseGetData() //safalra - set GET variables
> {
>     GET_DATA=new Array();
>     var getDataString=new String(window.location);
>     var questionMarkLocation=getDataString.search(/\?/);
>     if (questionMarkLocation!=-1)
>     {
>       getDataString=getDataString.substr(questionMarkLocation+1);
>       var getDataArray=getDataString.split(/&/g);
>       for (var i=0;i<getDataArray.length;i++)
>       {
>         var nameValuePair=getDataArray[i].split(/=/);
>         GET_DATA[unescape(nameValuePair[0])]=unescape(nameValuePair 
> [1]);
>       }
>     }
>   }
>
>
> if(GET_DATA['maxx'] && GET_DATA['minx']) //if extent is set, zoom!  
> Part of
> body onload
>     {
>      myKaMap.zoomToExtents(getMinx, getMiny, getMaxx, getMaxy);
>      //todo set selected layers from layer variable
>     }
>
>
>
> //the offending function
>   var oMap = this.getCurrentMap();
>
>     //the geographic center - where we want to end up
>     var cgX = (maxx+minx)/2;
>     var cgY = (maxy+miny)/2;
>
>     var tmpCellSizeX = (maxx - minx)/this.viewportWidth;
>     var tmpCellSizeY = (maxy - miny)/this.viewportHeight;
>     var tmpCellSize = Math.max( tmpCellSizeX, tmpCellSizeY );
>
>     var tmpScale = tmpCellSize * oMap.resolution *
> inchesPerUnit[oMap.units];
>
>

+-----------------------------------------------------------------+
|Paul Spencer                           pspencer at dmsolutions.ca   |
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|Applications & Software Development                              |
|DM Solutions Group Inc                 http://www.dmsolutions.ca/|
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