How to create a Flash platformer using Citrus Engine

More than a year ago I shows you how to create a little game prototype using Citrus Engine.

A year has passed, and now Citrus Engine is back with version 2.0 which promises to let us create complex games in a quick.

For all you specs maniacs, here it is a brief list of features:

* Blazing 50 FPS in the browser on current machines, and 250+ FPS on the desktop (or Adobe AIR).
* Integrated with Box2D physics, which allows for tumbling crates, pulleys, vehicles, and just about anything else you can imagine, without the limitations of a grid.
* Supports multiple rendering methods with very little code. Like blitting and sprite sheets? Citrus Engine’s got it. Prefer animating using the timeline? No problem.
* Hijack the Flash IDE and use it as a level editor, for easily laying out and iterating on level designs.
* Robust documentation includes and ASDoc API, tutorial videos, and a forum.
* Standards-based code API means developers and designers spend more time tweaking the fun stuff, and less time debugging.
* Level-based progressive downloading allows gamers to start playing the game quicker by only downloading what the next level needs.
* Pre-made commonly used objects, like a hero, coins, enemy, platforms, clouds, and more!
* Easily use embedded or dynamic graphics.
* Decoupled architecture allows for custom rendering methods, like blitting or 3D.
* Sound management
* Keyboard and input management
* Built-in particle system
* Intuitive Signals event framework

Ok, the boring part is over. Now take this little prototype I made in 20 minutes (yes, 20 minutes):

Look at what we have:

* The hero (on the bottom right)
* A pushable crate (on the bottom left)
* Some platforms around the stage
* A moving platform
* An enemy (on the upper right corner)
* A coin (on the upper right corner)

Move the hero with LEFT and RIGHT and jump with SPACE. Try to grab the coin. See what happens if you touch the enemy. The game mechanics are complex enough to represent a level of a good platformer. But it took me only a few lines to do it.

This is the main class [...]

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