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module Boid
/* Dit raamwerk toont een verzameling boids.
Zie voor achtergrondinformatie:
http://www.red3d.com/cwr/boids/
http://www.vergenet.net/~conrad/boids/pseudocode.html
Zet de 'Environment' op 'Object IO' en 'Project Options' op 'No Console'.
*/
import StdEnv, StdIO, support
:: BoidSt
= { boids :: ![Boid]
, colours :: ![Colour]
}
:: Boid
= { pos :: !Pos
, vel :: !Vel
, col :: !Colour
}
Start :: *World -> *World
Start world = startIO SDI {boids=[],colours=flatten (repeat colours)} (openIds 2 `bind` initGUI) [ProcessClose closeProcess] world
initGUI :: [Id] (PSt BoidSt) -> PSt BoidSt
initGUI [windowId,timerId] pSt=:{ls}
# (errors,pSt) = seqList [openWindow NilLS window,openTimer undef timer,openMenu undef menu] pSt
| all ((==) NoError) errors
= pSt
| otherwise = abort "Could not create the entire GUI.\n"
where
window = Window "Boids" NilLS
[ WindowClose (noLS closeProcess)
, WindowViewSize windowsize
, WindowLook True (look ls.boids)
, WindowMouse onlyDown Able (noLS1 mouse)
, WindowId windowId
, WindowPen [PenBack background]
]
timer = Timer (ticksPerSecond / 20) NilLS [TimerFunction (noLS1 (const lockstep)),TimerId timerId,TimerSelectState Unable]
menu = Menu "&File"
( MenuItem "&Clear" [MenuShortKey 'c',MenuFunction (noLS clear)]
:+: MenuSeparator []
:+: MenuItem "S&tep" [MenuShortKey 't',MenuFunction (noLS lockstep)]
:+: MenuItem "&Go" [MenuShortKey 'g',MenuFunction (noLS (appPIO (enableTimer timerId)))]
:+: MenuItem "&Halt" [MenuShortKey 'h',MenuFunction (noLS (appPIO (disableTimer timerId)))]
:+: MenuSeparator []
:+: MenuItem "&Quit" [MenuShortKey 'q',MenuFunction (noLS closeProcess)]
) []
onlyDown mst = case mst of
MouseDown _ _ _ = True
_ = False
/* look tekent de boids.
*/ look :: [Boid] SelectState UpdateState *Picture -> *Picture
look boids _ {newFrame} picture
= foldr (\{pos,col} -> appPicture (fillAt (toPoint2 wsize pos) boidbody o setPenColour col)) (unfill newFrame picture) boids
where
wsize = rectangleSize newFrame
/* lockstep berekent de volgende toestand van alle boids.
*/ lockstep pSt=:{ls}
= appPIO (setWindowLook windowId True (True,look new_boids)) {pSt & ls={ls & boids = new_boids}}
where
new_boids = simulatie ls.boids
/* clear wist alle boids.
*/ clear pSt=:{ls} = appPIO (setWindowLook windowId True (True,look [])) ({pSt & ls={ls & boids=[]}})
/* mouse creeert een nieuwe boid met snelheid nul op de positie van de muis.
*/ mouse mSt pSt=:{ls=ls=:{boids,colours}}
= case mSt of
MouseDown pos _ _
# (wsize,pSt) = accPIO (getWindowViewFrame windowId) pSt
# new = {pos=fromPoint2 (rectangleSize wsize) pos,vel=zero,col=hd colours}
# boids = [new:boids]
# pSt = {pSt & ls={ls & boids=boids,colours=tl colours}}
# pSt = appPIO (setWindowLook windowId True (True,look boids)) pSt
= pSt
otherwise = pSt
windowsize = {w=640,h=400}
colours = [Red,Green,Blue,Cyan,Magenta,Yellow,LightGrey,Grey,DarkGrey]
boidbody = circle 3
background = Black
threshhold_dist = 0.02
threshhold_wall = 0.01
viewing_distance = 0.3
/** Dit is de functie die je zelf moet schrijven.
Bereken de volgende toestand voor alle boids in de lijst.
*/
simulatie :: [Boid] -> [Boid]
simulatie ...
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