Shapes on canvas

[diebarral]

Hi @nswamy14,

I have a situation at my current project for which I have to overlap a second canvas on top of this library to display some shapes the client wants to see (zones, more specifically). This has been proven to be quite complicated to get right, so the alignment and zoom/scale between the two canvases make sense.

It'd be great if this library supported drawing additional shapes on top of the heatmap because I avoid the problem mentioned above. Also, this is something I'm willing to do myself and create a pull request later on.

The solution I'm thinking of is providing a function to which you can pass an array of objects, where each object represents a shape. This object would be a list of points that represent the vertexes of the shape (only polygons for now).

What do you think about this? Do you think is doable? Do you see any potential issue I might run into? Any consideration I need to have?

Thanks!