RE: [pygame] Pygame-Fenix - Using generators as game objects

["Noah Kantrowitz" <noah@xxxxxxxxxxxxxx>]

Panda is more of a hybrid of an actor system and a lot of interlinked state machines (each actor has an FSM, and there are others that are global). I do actually like this model a lot, just not the Panda API.

--Noah

> -----Original Message-----
> From: owner-pygame-users@xxxxxxxx [mailto:owner-pygame-users@xxxxxxxx]
> On Behalf Of Knapp
> Sent: Monday, December 01, 2008 10:33 AM
> To: pygame-users@xxxxxxxx
> Subject: Re: [pygame] Pygame-Fenix - Using generators as game objects
> 
> On Mon, Dec 1, 2008 at 6:05 PM, Fiona Burrows
> <fiona@xxxxxxxxxxxxxxxxxxx> wrote:
> >
> >
> > Noah Kantrowitz wrote:
> >
> > If you want to look up information about this, the general term is
> > "actor-based" programming. Existing libraries (neither of which ever
> seemed
> > that great) include PARLEY and Dramatis. Stackless tasklets are also
> a very
> > nice way to handle this.
> 
> Panda3d is a lot like this also. This sample code is from their intro
> in the manual. They have 2 systems that work together. One is event
> driven and the other is task driven (tasks get called after each
> screen refresh or so). You then just make little defs that say what to
> do at each event or task slice and add them to the caller. Collisions
> can be set to trigger events or you can use a task to check the event
> que each turn.
> 
> This code loads a 3d landscape and a panda bear actor and then makes
> the panda walk from side to side and turn around. Then the camera
> spins round and round also.
> 
> import direct.directbase.DirectStart
> from pandac.PandaModules import *
> 
> from direct.task import Task
> from direct.actor import Actor
> from direct.interval.IntervalGlobal import *
> import math
> 
> #Load the first environment model
> environ = loader.loadModel("models/environment")
> environ.reparentTo(render)
> environ.setScale(0.25,0.25,0.25)
> environ.setPos(-8,42,0)
> 
> #Task to move the camera
> def SpinCameraTask(task):
>   angledegrees = task.time * 6.0
>   angleradians = angledegrees * (math.pi / 180.0)
>   base.camera.setPos(20*math.sin(angleradians),-
> 20.0*math.cos(angleradians),3)
>   base.camera.setHpr(angledegrees, 0, 0)
>   return Task.cont
> 
> taskMgr.add(SpinCameraTask, "SpinCameraTask")
> 
> #Load the panda actor, and loop its animation
> pandaActor = Actor.Actor("models/panda-model",{"walk":"models/panda-
> walk4"})
> pandaActor.setScale(0.005,0.005,0.005)
> pandaActor.reparentTo(render)
> pandaActor.loop("walk")
> 
> #Create the four lerp intervals needed to walk back and forth
> pandaPosInterval1= pandaActor.posInterval(13,Point3(0,-10,0),
> startPos=Point3(0,10,0))
> pandaPosInterval2= pandaActor.posInterval(13,Point3(0,10,0),
> startPos=Point3(0,-10,0))
> pandaHprInterval1= pandaActor.hprInterval(3,Point3(180,0,0),
> startHpr=Point3(0,0,0))
> pandaHprInterval2= pandaActor.hprInterval(3,Point3(0,0,0),
> startHpr=Point3(180,0,0))
> 
> #Create and play the sequence that coordinates the intervals
> pandaPace = Sequence(pandaPosInterval1, pandaHprInterval1,
>   pandaPosInterval2, pandaHprInterval2, name = "pandaPace")
> pandaPace.loop()
> 
> run()
> 
> 
> --
> Douglas E Knapp
> 
> http://sf-journey-creations.wikispot.org/Front_Page