Can I produce a heatmap visualization?

This might be a stretch because I haven’t seen anything like this described here or on the goJS website, but would it be possible to generate a heatmap visualization with goJS? Similar to this:

You’re right – that’s not what GoJS is aimed at. GoJS likes to deal with discrete objects and relationships, and it supports interactivity and editing. GoJS is not oriented towards visualizing amorphous data.