[ka-Map-users] Re: Zoom tool

[Paul Spencer]

Wayne,

you are correct, there is no tool to zoom at the point of click.  It  
would be relatively straightforward to accomplish this with a  
subclass of the query tool.  Here's a sample (untested of course ;))

KAMAP_ZOOMIN = 0;
KAMAP_ZOOMOUT = 1;

function kaZoomOnClick( oKaMap, type ) {
     kaQuery.apply( this, [oKaMap, KAMAP_POINT_QUERY] );
     this.name = 'kaZoomOnClick';
     this.cursor = 'auto';
     this.type = type;

    for (var p in kaQuery.prototype) {
         if (!kaZoomOnClick.prototype[p])
             kaZoomOnClick.prototype[p]= kaQuery.prototype[p];
     }
};

kaQuery.prototype.onmouseup = function(e) {
     var gp = this.kaMap.pixToGeo( -this.startx, -this.starty );
     var map = this.kaMap.getCurrentMap();
     var scales = this.kaMap.getScales();
     var newScale = map.currentScale;
     if (this.type == KAMAP_ZOOMIN && newScale < scales.length - 1) {
         newScale ++;
     } else if (this.type == KAMAP_ZOOMOUT && newScale > 0) {
         newScale --;
     }
     this.kaMap.zoomTo(gp[0],gp[1], scales[newScale]);
     return false;
};

Cheers

Paul

On 17-May-06, at 2:28 AM, Wei Yang, Ng - Wayne wrote:

> Hi Paul,
>       I was asked to create a zoom tool that allows me to click any  
> where on the map and either zoom in on the location or zoom out of  
> it. Is there such a tool yet? From my understanding there is only  
> the query and pan tool.
>
> Cheers,
> Wayne

+-----------------------------------------------------------------+
|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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