Esri Canvas Tile Layer

A work in progress.

See https://blueraster.github.io/esri-canvas-tile/

We are trying to render tiles to canvas so we can read, filter, and modify the image data in canvas.

For a working leaflet version, See https://blueraster.github.io/esri-canvas-tile/mapnik-leaflet.html

Layer API (in Progress)

This will describe the methods for interacting with this particular layer. This component inherits from esri/layers/Layer.

Constructor

var canvasLayer = new CanvasLayer();

Methods

show

canvasLayer.show()

• Show the layer

hide

canvasLayer.hide()

• Hide the layer

forceUpdate

canvasLayer.forceUpdate()

• Force the canvas to clear the tiles and fetch new tiles

setConfidenceLevel

canvasLayer.setConfidenceLevel(confidence)

• Set's the desired confidence level for the layer
• Sole argument is a string with value of either all or confirmed.

setMinimumDate

canvasLayer.setMinimumDate(minDate)

• Set's the minimum date for the layer
• Currently must be in numeric format where 15000 is the base, then add the number of days to it

setMaximumDate

canvasLayer.setMaximumDate(maxDate)

• Set's the maximum date level for the layer
• Currently must be in numeric format where 15000 is the base, then add the number of days to it

setDateRange

canvasLayer.setDateRange(minDate, maxDate)

• Set's the minimum and maximum date level for the layer
• Currently must be in numeric format where 15000 is the base, then add the number of days to it

Known Issues

• The data seems to stop rendering after zoom level 12. Will need to scale tiles appropriately

TODOS

• Look into various methods for optimizations, such as caching, and client side re-rendering of pixel data when filters are applied.
• Investigate work arounds for the Known Issues above