Re: [Chicken-users] Chicken and Cocos2Dx on Google Play!

[Kristian Lein-Mathisen]

Thanks a bunch for the encouraging feedback! I wonder where this project might end up.

Shawn:

The bottom-left numbers read (from top to bottom): number of drawn primitives, seconds per frame, frames per second.

For example, if you evaluate

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

You should see the primitives go up from 48 to 49.

K.

On Sat, Nov 3, 2012 at 10:18 PM, Shawn Rutledge <address@hidden> wrote:

That's cool!  I tried it on my Galaxy Note (1st gen) and FPS is jumping around a lot, even when nothing is moving, usually between 50 and 60fps, and sometimes hitting peaks of more than 60 and sometimes really low values.  What is the top of those 3 numbers in the lower-left?  Mine says 48 and stays the same.

On 2 November 2012 15:20, Kristian Lein-Mathisen <address@hidden> wrote:

Dear Chickeners,

I have been playing around with Chicken, Chipmunk and Cocos2Dx for a while, and I've finally got a demo up and running on Android. I've published it on Google Play in the "Libraries and Demos" category so you guys can test it!

Check it out: Scheme REPL with Cocos2Dx

The demo features a truck which you can drive back and forth, clumb up hills and fall down. Not very exciting, but I do actually catch myself playing it when I don't know what I should be coding on! The cool part is that there's a Chicken REPL behind the scenes.  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 nc [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!

If you have an Android phone, it'd appreciate if you took the time to check it out. I am particularly interested if the app won't start at all, and perhaps what framerate you're getting (very bottom-left). I know there is a memory leak somewhere (thanks Alaric!), but otherwise I hope things should be running fairly smoothly.

Cheers!

Kris

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