[OpenLayers-Users] Referencing Kamap a Tile

[Christopher Schmidt]

On Thu, Jan 25, 2007 at 04:36:05PM -0800, Ben Brehmer wrote:
> I have a Kamap Layer and I need to be able to reference the tile 
> associated with a viewport pixel. I don't know if this is possible, but 
> I want to retrieve the tile that lies underneath a certain pixel 
> position within the viewport.

Right click? :)

More seriously, you can get the geographic location from
getLonLatFromPixel or something similar on the Map object, and then look
at the KaMap getURL function:
    getURL: function (bounds) {
        var mapRes = this.map.getResolution();
        var scale = Math.round((this.map.getScale() * 10000)) / 10000;        
        var cellSize = new OpenLayers.Size(mapRes*this.tileSize.w,
                                           mapRes*this.tileSize.h);
        var pX = Math.round(((bounds.left) / cellSize.w) *
                            this.tileSize.w);
        var pY = -Math.round(((bounds.top) / cellSize.h) *
                              this.tileSize.h);
        return this.getFullRequestString(
                      { t: pY, 
                        l: pX,
                        s: scale
                      });
    },

Something like this ought  used with px.lon, px.lat instead of
bounds.left, bounds.top might get you there, modulo some rounding
issues. Give it a shot? 

Regards,
-- 
Christopher Schmidt
MetaCarta