Should plugin have access to canvas?

[hsauro]

Should a plugin have access to the canvas so that it can add additional visual aspects to the canvas? eg a plugin might draw a bar graph next to a node to indicate the concentration of the node.

[evilnose]

Instead of drawing directly to canvas, I think the better approach is to use the CanvasElement base class, which I've used to represent nodes, reactions, etc. They have event handlers (for mouse clicking, painting, etc.) and have necessary functions to act as sort of canvas "widgets".

What is currently left to be done is to expose the CanvasElement class to the user and perhaps provide some examples in the documentation.