We are a software development firm with experience, though we have just began working on Freelancer.com, which is the reason for our low bid.
In our team there are members with experience in working with canvas libraries (such as [login to view URL] or [login to view URL]). We will be able to solve all your issue with porting the application from Processing to Processing.js.
I think we will be able to do it in a single business working day. Please PM us with more information about the project (like the [login to view URL] version you are using, or if you want to use the latest version).