Enabled Element Layers

Adding Layers to an Enabled Element allows Cornerstone to display labels maps and perform image fusion.

The Enabled Element Layers API allows developers to add build a composite set of images with Cornerstone.

Basics:

• An Enabled Element can have more than one Layer.
• Each Layer is similar to an Enabled Element - They each have their own Image and Viewport, off-screen rendering Canvas, etc...
• Only a single Layer can be active at a time.
• Layers have properties for visibility and opacity, and are uniquely referenced by a Layer ID.

When a Layer is Active:

• The layer's Image is available at enabledElement.image
• The layer's Viewport is available at enabledElement.viewport

This means that typical functions such as setViewport and getViewport apply to the active layer.

Layers can be:

• Added (addLayer)
• Retrieved individually by Layer ID: getLayer
• Removed individually by Layer ID: removeLayer

Additional functions:

• The current active layer can be retrieved getActiveLayer
• The Array of all layers can be retrieved: getLayers
• The Array of all visible layers can be retrieved: getVisibleLayers