[OpenLayers-Users] Referencing Kamap a Tile

[Tim Schaub]

> But what I want to do, is reference the top and left 
> attributes of a tile that is already loaded, with the 
> reference being made from a click event in the viewport (from 
> which I can retrieve the pixel or lon/lat).

// kaMath
var resolution = kaLayer.getResolution();
var tileMapWidth = resolution * kaLayer.tileSize.w;
var tileMapHeight = resolution * kaLayer.tileSize.h;
var mapPoint = kaLayer.getLonLatFromViewPortPx(viewPortPx);
var tileLeft = tileMapWidth * Math.floor(mapPoint.lon / tileMapWidth);
var tileBottom = tileMapHeight * Math.floor(mapPoint.lat / tileMapHeight);
var kaLeft = tileLeft / resolution;
var kaTop = -(tileBottom + tileMapHeight) / resolution;

kaRegards,
Tim

> 
> Thanks,
> 
> Ben
> 
> 
> 
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