Mike Chambers

Last week I was playing around with a little EaselJS experiment which required me to do collision detection against all items on the screen. This worked fine with a small number of items, but of course, the more items I added, the slower everything became.

I knew that I needed to optimize the code, and pare down the number of collision checks. I have done this before with a grid (even held a contest for it) and was going to port that AS3 code to JavaScript. However, Ralph Hauwert suggested I look at implemented a QuadTree, which should be more efficient.
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If you have happen to have been watching my Flickr feed for the past week or two, you have probably noticed that I have been playing around with creating some graphics using Canvas and EaselJS. What started as a simple EaselJS experiment, quickly morphed into an excuse to build a mini app / example and play around with some of the new HTML5 and CSS3 features.

The example I created (named PixelFlow) is a simple example / app that allows you to choose an image, and then create some designs using the colors from the image. The core drawing functionality is built about the HTML5 canvas element and the EaselJS library. It also leverages CSS3 transitions and transformation for animating the UI elements (loading and unloading).

You can play around with the example yourself at:
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