# leaflet-tilelayer-colorpicker
A Leaflet TileLayer with getColor(latLng)

## API
```
// factory
var layer = L.tilelayer.colorPicker(cors_enabled_url_template,options);
layer.addTo(map);

// getColor(latLng) returns Uint8Array ([r,g,b,a]) or null
var color = layer.getColor(map.getCenter());
var red = color[0];
var green = color[1];
var blue = color[2];
```

### Preconditions
+ CORS enabled Tiles are required.
+ `crossOrigin` option is set to **anonymous** by default, DO NOT set to false manually.

## Demo : display color under cursor

+ <https://frogcat.github.io/leaflet-tilelayer-colorpicker/>

## Demo : display elevation under cursor using Mapbox Terrain-RGB

+ <https://frogcat.github.io/leaflet-tilelayer-colorpicker/mapbox-terrain-rgb.html>

See also : <https://www.mapbox.com/blog/terrain-rgb/>


## Demo : display elevation under cursor using GSI's DEM PNG Tile

+ <https://frogcat.github.io/leaflet-tilelayer-colorpicker/elevation.html>

See also : <http://maps.gsi.go.jp/development/demtile.html>