The 4th part of my series on creating an EaselJS-Game is about adjusting the game to different display-sizes, which is very important when targeting mobile devices. To visualize, what the result is going to look like – I added the following two iframes, to demonstrate how the game adjusts to a different screen-/stage-size.

Open this http://demos.indiegamr.com/jumpy/part4/index_nearestNeighbor.html in a new browser-window and see how it adjusts to your window-size as you reload the page after resizing the window.
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This is Part 2 of my tutorial on How to create a Runner Game for mobile with EaselJS – in this part i’m going to cover the collision-detection between two objects in EaselJS.

Types of Collision Detection

There are several types of collision detection methods, I’m going to explain two of the most commong ways to detect a collision – if you want more/detailed information on the subject I would encourage you to google for it or try this article as an introduction to the topic.

1) Distance Based- or Circle-Collision

This is probably the simplest type of collision detection. What you basically have to do is to set a collision-radius for each object, then calculate the distance between the objects and see if the distrance is lower than the radii combined. However the following image shows, that this kind of detection won’t be suitable for our platform game:

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