Scheme REPL with Cocos2Dx

Scheme REPL with Cocos2Dx Free App

Rated 4.25/5 (36) —  Free Android application by Adellica

About Scheme REPL with Cocos2Dx

This is a demo for developers. Please don't give low ratings based on playability - it's not meant to be a complete game! It may still be entertaining though, you can drive a truck up hills and fall back down.

=== What this is about ===

We have wanted to try REPL-based game development for a long time, and this is our attempt.

A REPL is like a command-line interface to the inside of your running program. It's like having a debugger running constantly, but perhaps less troublesome.

REPL-based development should allow us to develop games and apps much faster. Your new code takes effect immediately, and can be executed on your target hardware.

Bret Victor has a very nice talk about immediate feedback in his "Inventing on Principle" talk: http://vimeo.com/36579366

This project is an attempt to accomplish this, and so far it seems to have worked fairly well!

=== How we are doing this ===

The demo combines three third-party libraries:
- Chicken Scheme for the REPL
- Cocos2Dx for graphics
- Chipmunk for physics

Cocos2Dx is a C++ library with 2D-games in mind. It lets you manage things like sprites, their animations and touch events. It is fast and portable (Android, iOS and others). Chipmunk is a physics engine writtten in C. It's fast with a very nice API. Chicken Scheme is a Scheme-to-C compiler and interpreter.

All should also run on iOS, but I don't have a Mac.

=== Bindings ===

The Cocos2Dx bindings are in an early-stage. Basic functions to manipulate sprites are available:
- (CCSprite::create "CloseNormal.png")
- (setPosition *sprite* x y)
- (getLocatino touch-event)

The Chipmunk API is more mature. You can read about the `chickmunk` project on https://github.com/kristianlm/chickmunk.

=== Try it yourself ===

You can connect to the REPL directly from your laptop if your phone is on the same WiFi, or use USB. Try Settings->Wireless Networks->Wifi Settings-> [Menu]->Advanced when looking for you phone's IP.

With netcat (or Emacs, with netcat [ip] [port] as your Scheme interpreter), you could try:

$ nc [phone ip] [port]

Alternatively, you could use USB with adb and forward:

$ adb forward tcp:1234 tcp:1234
$ nc localhost 1234

Once you see the REPL prompt @>, you can play around:

;; 'import' chipmunk bindings
(use chickmunk)

;; where is the player?
(body-get-pos truck)

;; redefine game-loop to pause game unless you're touching the screen
(define (*update*)
(if *touch-down* (space-step space (/ 1 120))))

;; now let's give the truck a gentle push
(body-set-ang-vel wf -20)
;; now touch the screen to watch it drift off

;; restart the app to revert your changes
(exit)

;; You can also manipulate the physics-world:

;; Drop a ball from the sky
(space-add space
`(body ((pos (320 700)))
(circle (density 0.001)
(friction 1)
(radius 10))))

;; Add a gentle but slippery slope
(space-add space
`(body ((static 1))
(segment (friction 0.1)
(endpoints ((250 500)
(800 550))))))

;; type this to see the touch-down state:
*touch-down*
;; it should be #f when your finger is off the screen, and touch-coordinates otherwise. evaluate it while holding the screen to try it out!

This is just a small example of what can be done. As a matter of fact, almost everything in the demo itself was developed this way: the REPL, Emacs and Inferior Scheme.

=== Source code ===

The source-code for the demo can be found on github: https://github.com/Adellica/cocoscheme.

Please give feedback, let us know if you like this! And please let us know of any similar efforts. Thanks!

How to Download / Install

Download and install Scheme REPL with Cocos2Dx version 1.0 on your Android device!
Downloaded 1,000+ times, content rating: Everyone
Android package: com.adellica.cocoscheme, download Scheme REPL with Cocos2Dx.apk

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App History & Updates

More downloads  Scheme REPL with Cocos2Dx reached 1 000 - 5 000 downloads
More downloads  Scheme REPL with Cocos2Dx reached 1 000 - 5 000 downloads
More downloads  Scheme REPL with Cocos2Dx reached 500 - 1 000 downloads
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What are users saying about Scheme REPL with Cocos2Dx

C70%
by C####:

This game changed me

J70%
by J####:

Gay

T70%
by T####:

Jean loves this game.

K70%
by K####:

Nothing can match the feeling of monster trucks falling towards infinity.

K70%
by K####:

I thing that this game has potential of becoming a good game. One this is tho that the game speed on my S3 was really fast, so that's one main thing you have to fix

R70%
by R####:

Excellent demo

F70%
by F####:

Best game

S70%
by S####:

Jean loves this game.

T70%
by T####:

Nothing can match the feeling of monster trucks falling towards infinity.

T70%
by T####:

I thing that this game has potential of becoming a good game. One this is tho that the game speed on my S3 was really fast, so that's one main thing you have to fix

Z70%
by Z####:

Excellent demo

J70%
by J####:

Best game


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Rating Distribution

RATING
4.35
36 users

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