ImageLookup

new ImageLookup( src, onInit ) → {ImageLookup}

Creates a ImageLookup object

Name	Type	Description
`src`	String	path to image file
`onInit`	function	Callback fired once imageLookup is initialized

isLoaded :boolean

Has the image been loaded

ctx :Object

2d canvas context to render image to

canvas :HTMLCanvasElement

HTMLCanvasElement to render to

image :HTMLImageElement

HTMLImageElement to load image to

getIdFromLatLon

Samples a target lat,lon pair to get id (e.g. the red channel)

Name	Type	Description
`lat`	number	target latitude
`lon`	number	target longitude

new ImageLookup( src, onInit ) → {ImageLookup}