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Fast Game Prototyping with Flashpunk and Minimal Comps

January 18th, 2012

The proper way to build a game in Actionscript (or any other language) is to create a quick prototype and test the gameplay. Then, if the gameplay is good, you refine it. If it isn’t working, you go back to the drawing board and create another prototype. Large game companies often scrap ideas that aren’t working when the prototype is tested.

In reality, it oftens takes so much time to get the basic mechanics working that you would never consider scrapping it, even if it isn’t really a good game. But, it doesn’t have to be that way. Two issues that slow down game development are:

#1: Dealing with basic input/output, collision detection and all of the “simple” things that you need to make a game function. Coding these elements takes hours and has very little to do with making your game awesome.

#2: Fine tuning your game. There are usually several inter-related variables that need to be adjusted. The (slow) way to do this is to make an educated guess, set the values, publish and test. Then, adjust the variable values and try again.

The good news is that there are solutions to both of these problems. The solution to problem #1 is Flashpunk. It’s an open-source AS3 framework for building pixel-based 2D games. It handles a lot of the basic animation, collision detection, keyboard input and other issues so that you don’t have to do it. It’s a pure Actionscript-based library that compiles in FlashDevelop, which is free and open source, so you don’t even need the Flash IDE. I whipped up a sample “game” in Flashpunk below. This only took me a few hours, including the learning curve.

"But, I'm making an "immersive 3D RPG for iPhone" you say? So what? You can still use Flashpunk to do some quick gameplay demos and make sure that your basic gameplay is actually fun. Once you get the hang of Flashpunk, you can whip up a simple game demo in less than a day. It may save you a lot of time down the road. Go here to get the source code and then work through the tutorials. You can be making games by the end of the day.

Now, if you tried my game demo above, you are probably saying "this sucks! I can't even jump up to the platforms!" That's where my second time saver comes in. Minimal Comps is a set of basic Actionscript3 components that can help you with your prototyping. In the game above, I've added a game tuning panel made with Minimal Comps. To see it, right-click on the stage and choose "Show Testing Console." This will open the panel with several options. The first button toggles the collision hitbox visibility. If you make the hitboxes visible, you will notice a bug that I left in the game when you move the character to the left. By changing the values in the textfields, you can adjust the game gravity and jump velocity until the gameplay works and feels right.  Minimal comps makes it easy to set up this testing panel for tuning your game in real time.

Prototyping in Flashpunk with Minimal Comps for real-time game tuning is a super fast way to test out a game concept. It'll help you spend less time on the annoying part of game development and more time doing graphics and level design. Good Luck!

As always, you can download the source code for my sample here. It's a pure actionscript project, so there is no FLA. If you use FlashDevelop, you can simply open the project file and start modifying things. If you use FlashBuilder/Flex, you're on your own. Here are a few random things you might want to know:

- It is important to note that Flashpunk does not make the game for you. You still have to write all of the code for your gameplay, so you must have some basic Actionscript 3 skills and some idea of how to code a game. If you don't want to code a game, you should stick with GameMaker.

- The documentation is not awesome for Flashpunk. The forums are a great place to get answers to your questions.

- Flashpunk classes are useful even if you want to build a game in the Flash IDE, but you will need to modify the way they are used. You may want to try them out in a pure AS3 project first, so you will know how they work.

- My sample "game" is not optimized. Feel free to use the source code as a basis for your own game setup, but a lot of things need to be changed to optimize the code. I've sprinkled a lot of comments in the code to help you out.

- This is not my original idea. It is a compilation of good ideas from the sources listed below. I just put them together so I could give you some source code.

Emanuele Feronato: Creation of a platform game using Flashpunk

Photon Storm: Flash Game Dev Tip #5 - Configure your games in real time

How to use minimalcomps (GUI API) with flashpunk

In case you missed it above, here are the source files for this post.

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  1. Thomas
    January 23rd, 2012 at 09:07 | #1

    Great post. I just happened to stumble upon you blog when searching for information about ASdoc, and was then pleasantly surprised to find a lot of other good bits and info. Nice work, Bookmarked!

  2. Linkz
    May 3rd, 2012 at 06:20 | #2

    Hi, there… great post, but there is a little error in your game.
    when the character goes left the sprite goes out the hitbox, you should use the code

    spritemap.flipped = true/false;


  3. Ugly Bambr
    December 25th, 2012 at 07:01 | #3

    Thanks a lot! It is very helpfull!!

  1. May 28th, 2012 at 12:53 | #1