What is a Layer ?

1. Canvas or DOM element
2. Displayed within the viz
3. Sync with the camera

When to use layers ?

• Annotate the graph
• Add non native features
• Add meaning to the graph

API

            
              ogma.layers.addCanvasLayer(
                (ctx) => {...},
                index
              )
              ogma.layers.addLayer({
               element: beautifulDomElement
              })
              ogma.layers.addOverlay({
               element: beautifulDomElement,
               position: {x: 0, y: 0},
               size: {width: 100, height: 50}
              })