Colorillo: Draw on an LED Wall

Colorillo currently powers a collaborative drawing event in Vienna: At Adria Wien there is a temporary LED wall on which you can draw with the help of Colorillo.

Take your mobile phone (iPhone or Android, also iPod Touch, iPad or Laptop works) out of your pocket, enter the URL that you find there, and on your screen you will see what’s on the LED wall. Then you can paint on that. Of course with the technology of Colorillo, multiple people can draw at the same time.

The resolution is a little limited, as the LED wall had been built by hand by students of architecture, so in my experience it’s a little more like splash painting with colors, but we’ll see how it turns out tonight.

Tonight (July 22, 2010) at 8:30pm there is a special drawing event with John Megill of FM4 as a DJ. If you’re around, come by! It will be fun!

The whole event is hosted by the Ärzte ohne Grenzen (Doctors without borders) beach that has been set up for the duration of the AIDS conference that is being held in Vienna this year.

You can also join the event on Facebook and check out more info at the Colorillo blog post.

Reddit-like Collapsible Threads for Hacker News

I enjoy consuming and participating at Hacker News by Y Combinator resp. Paul Graham.

One thing that needs improvement is the reading comments there. At times it happens that the first comment develops into a huge thread, and then the second top-level comment (which might also be well worth reading) disappears somewhere down into the page.

Collapsible Threads at Hacker News through a bookmarkletReddit has combatted this common problem by making threads easily collapsible. I think it is worth having this also on Hacker News, so I implemented it and wrapped it into a bookmarklet so that you can use this functionality on-demand at Hacker News.

Drag this to your bookmarks bar: collapsible threads

As soon as it is available in your bookmarks bar, go to Hacker News and click on it when viewing a comments page. Next to each thread a symbol [+] will appear. Click it to collapse the thread and it will change to a [-]. Click that to expand the thread again.

I have licensed the source code under an MIT License. Click here to view the source code of hackernews-collapsible-threads.js. (Actually for caching reasons the bookmarklet currently loads hackernews-collapsible-threads-v6.js which is actually just the same)

The Hacker News HTML source code seems quite fragile in the sense that the comments section of a page can’t be identified in a really unique way (for example it does not have an HTML id attribute), so it might break when the layout of the page changes. This is why the bookmarklet is actually only a loader for the script on my server. I have tuned the HTTP headers in a way that your browser should properly cache the script so that the speed of my server should not affect the loading of the bookmarklet.

Enjoy :)

If you use Hackernews on another URL than news.ycombinator.com or hackerne.ws, use this bookmarklet: collapsible threads (no domain check)

Update March 18, 2011: Paul Biggar has contributed a greasemonkey script that also works on Firefox 4. I have adapted it so that it also works (which basically involved copying the jQuery script above mine) in Safari and Chrome (using NinjaKit).

Install Greasemonkey script

Install Paul Biggar’s Greasemonkey script

Update November 22, 2011: Eemeli Aro has sent me a little CSS tweak so that the lines don’t move around when collapsing. The code downloadable from above contains his code. Thank you!

Posted in Web