Ask HN: What projects are you currently working on?

I got curious about how CPU-intensive it would be to run a server for a game like agar.io or diep.io. In these games there are a lot of circles moving around on a 2D map, and you have to check collisions between them.

First was a naive Python version. Test every circle against every other circle for collision, O(N^2). This way I managed only 200 circles on my playing field. I wanted to see how much faster it would be rewritten in C. That got me to 1500 circles.

Now obviously the way I was checking for collisions is silly, some kind of subdivision of space is required to avoid having to check everything against everything. I split the playing field into a grid, and only test collisions between circles in nearby grid cells. That got me to 3000 circles running in Python.

Next I want to write that in C as well, to see how fast it would go.

I've been working on http://www.indeals.co.uk for a couple of years now, a side project that lists food & drink deals for independent venues in 3 cities. We're UK only at the moment but want to keep on growing to cover more places soon!

I've written an introductory book on Go http://github.com/thewhitetulip/web-dev-golang-anti-textbook, it taught hoe to write a webapp in Go without using a framework.

Earlier, it taught basic html, now I am rewriting the Tasks app, http://github.com/thewhitetulip/Tasks/, to use the front end framework http://vuejs.org, using the learning of my experiment, I'm putting together anther series of tutorials, http://github.com/thewhitetulip/intro-to-vuejs.

Thid is because I wanted an easy to understand tutorial which doesn't expect the user to have anything more than basic html/css/js knowledge.

edit: links

Rolling my own ergonomic back-up tools atm (implementing incremental, secure backups of MySQL dbs, IMAP Emails and Filesystem) because solutions already exist and I'm a silly person who hates himself and the safety of his data.

Nice!