|
|
新手,在看netlogo自带的例子时,有几行程序看不懂,希望高手能够指点。
' n) s9 l& e# Y' U( S. s6 ?# wnetlogo自带的social science--traffic grid这一例子当中,2 [" X, F4 Q& n1 K
globals
' A7 Y v0 c" {9 c0 d% \4 ]- W' u[
! z9 G' v) z$ O6 T grid-x-inc ;; the amount of patches in between two roads in the x direction
, y! ?8 x* E; @ grid-y-inc ;; the amount of patches in between two roads in the y direction/ V: M" N) V5 {$ E
acceleration ;; the constant that controls how much a car speeds up or slows down by if8 B/ [8 d/ i0 W: O% }- H
;; it is to accelerate or decelerate0 G9 I! M3 Z; R- N% p- f
phase ;; keeps track of the phase; Z3 m5 v. ?. u( t, R/ n9 ]
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
: i+ e, W$ @: f3 k current-light ;; the currently selected light
9 \; d8 l. X* k' }5 c9 a- L
4 t6 ]3 x3 y' c W ;; patch agentsets
( J. c0 _ E$ x intersections ;; agentset containing the patches that are intersections
7 q9 l' Z- q+ G, R+ d' B roads ;; agentset containing the patches that are roads
2 J; Z' z# ^& e- P4 S+ F]
# ?. z. s v# ]% O) Y; J: Q- g# n; q: ?
turtles-own
5 M) z1 a/ Q C2 R0 T! X& x( t[
3 S7 D _( }% y5 K- v speed ;; the speed of the turtle
4 T& x8 v; z* H: _: q+ s up-car? ;; true if the turtle moves downwards and false if it moves to the right
) n' r4 H% x1 o0 r. w4 O wait-time ;; the amount of time since the last time a turtle has moved. q: Z3 x: }. |% |. d; t, g' G0 T
]4 N1 B3 w9 b$ E; f3 j# O4 x
6 b9 m. J) s# f+ n+ r& d: Mpatches-own: B( d7 P0 K, B' ?$ ?' z
[
, l: j) z0 W( f4 | intersection? ;; true if the patch is at the intersection of two roads
0 m0 L3 `# o- @3 e green-light-up? ;; true if the green light is above the intersection. otherwise, false.
8 x9 e B1 K5 B( h5 t ;; false for a non-intersection patches.3 o- ]+ `' ^/ G" k
my-row ;; the row of the intersection counting from the upper left corner of the
9 f7 F/ V7 K. k7 e# S ;; world. -1 for non-intersection patches.: @ j. @- }; ?# g" ^( z
my-column ;; the column of the intersection counting from the upper left corner of the
$ f$ G- G1 [$ U; Q8 C# d ;; world. -1 for non-intersection patches./ Z Y8 |: V+ G1 s5 y! `
my-phase ;; the phase for the intersection. -1 for non-intersection patches.2 ]( w0 B j# F4 S
auto? ;; whether or not this intersection will switch automatically.! I: P0 z" _5 y9 n# g$ n) |6 w
;; false for non-intersection patches.: \" `/ j m1 x& W$ T
]
/ q7 _0 W) {4 w% W, `8 f
4 X2 e. U3 m! E, O* O1 s
' ^! w4 V( T6 v4 z! r5 n;;;;;;;;;;;;;;;;;;;;;;
9 |6 m9 V# B$ U1 N6 N;; Setup Procedures ;;
; Q7 {4 p1 L, _( j$ ];;;;;;;;;;;;;;;;;;;;;;
+ i' J- E% G, s# z; Q: L) p5 Q0 [' z8 }
;; Initialize the display by giving the global and patch variables initial values. s9 \: j" C1 w. h- L M) l2 W7 }
;; Create num-cars of turtles if there are enough road patches for one turtle to: \9 E: {8 V6 T0 l/ Y& H
;; be created per road patch. Set up the plots.
, k+ [5 E) E& t- v# Z- ]to setup% b% ]* X3 N0 o# r, [6 W
ca
% I4 H+ \9 F1 _ setup-globals
/ ]" L9 R# J9 i0 z) e9 G
! I, R3 l) o% R g) Q ;; First we ask the patches to draw themselves and set up a few variables6 }! B& p8 }0 C/ Z" B+ b8 a( `( l
setup-patches
! Z$ M, f4 V6 g9 f; M make-current one-of intersections
7 n/ i: F6 C; z- ^% X& s label-current
" e* j" v; L, U8 f+ T( O* g1 E4 e3 s3 e0 c7 W" I3 u
set-default-shape turtles "car"
c% R0 Z' f8 Y+ w6 r8 [/ }, C, s/ A$ F7 `
if (num-cars > count roads)2 r0 D0 \6 P. x' v' J0 W
[/ g& `' J8 ^6 Q9 O- _* T
user-message (word "There are too many cars for the amount of "
! Y s8 r3 b9 _/ I$ c9 p "road. Either increase the amount of roads "
% V. [! x/ C, J6 \$ h! n( v* |% m "by increasing the GRID-SIZE-X or "
0 f- ], i, l0 K! \, a3 N. X "GRID-SIZE-Y sliders, or decrease the "
" o5 h* b* {, K/ o2 E' [, P "number of cars by lowering the NUMBER slider.\n", y) y; H& M* F: e
"The setup has stopped.")0 I3 T9 O7 N+ T
stop
& T( j2 t9 [& ~ ]6 N, \+ G: ^+ d$ n+ Y% C
) b ?9 ]" l' d( u2 M, U/ P
;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
w+ Z7 Y- r$ b! ^1 d+ q: D% V' H crt num-cars; ` H) R/ w: C/ G* Z# L/ W u
[
. A: K4 S1 H# V. }0 y setup-cars& n, X% n P% f' E+ ~ s
set-car-color% d0 s( w- F. c" W# W: C) y
record-data/ t: I7 J! ]% c: ~: t
]
q P4 a! U! T: q I6 c4 b5 W$ }3 I0 r7 A4 p" _7 R5 i; E
;; give the turtles an initial speed
2 X( i% \- N3 C( Z4 I- Y& ^3 B& Q ask turtles [ set-car-speed ]
" w& T# B2 p. o, n2 _1 U% W2 y o/ h4 G- A
reset-ticks
- u! C% _7 z8 W9 ?end* `4 g r* y9 a* u6 F0 O- V4 k8 z
U: ]' n# s- h+ q, F9 v4 ?, ^;; Initialize the global variables to appropriate values- w2 P2 Y) i2 \% B' |
to setup-globals
, H( ^* e: c( c" `% @8 O set current-light nobody ;; just for now, since there are no lights yet
9 O. p$ f* l. h2 A' U" q set phase 0/ z5 u% D U- q% ]3 |' T
set num-cars-stopped 0$ J0 [3 Z$ {5 l9 T. s" C' v& g
set grid-x-inc world-width / grid-size-x
2 C. j$ W8 L3 @9 s+ i7 y; E. m set grid-y-inc world-height / grid-size-y$ D' U8 S* B4 d
' S8 o' T" n+ @" x& t! B/ ], p
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary# n4 F5 g2 u# e& ?$ s
set acceleration 0.099
- |" N) {0 W' T. X! T3 Kend
2 m! w% |3 ~# x* V0 k3 _
. |4 s- T. ^$ v& [* p) n* Z$ X;; Make the patches have appropriate colors, set up the roads and intersections agentsets,1 E/ U- {% N. z$ u( ^8 q0 G! }
;; and initialize the traffic lights to one setting
3 T/ u/ W3 c+ `5 D' q* z, Ito setup-patches
- P# d0 U- {, u6 [9 w0 w& S ;; initialize the patch-owned variables and color the patches to a base-color
* X' r& ~, S- s% _( ?% P ask patches
% |2 m2 @' j6 C1 W' r7 |: F [# t3 @/ D) c; b' E0 `( z/ ]: U
set intersection? false
1 b( E6 ~" t* F# _. |5 V9 o5 ~7 ?# C set auto? false, r2 P8 h+ ] g1 z; n
set green-light-up? true
' B$ n& d7 @+ w. V& J4 V9 d set my-row -1
0 I' w3 N8 D: v set my-column -1
, Q/ B5 J! ^. F+ } set my-phase -1
1 [6 h L C7 n' i set pcolor brown + 3
: N% u" k6 r2 Q" o/ p8 V ]" F. f" ]/ x) x+ i! M# d
" L* D- O4 ]. q- s3 r ;; initialize the global variables that hold patch agentsets0 T; S( h8 g9 i2 t4 Z! P. P
set roads patches with
+ V$ F1 s* n# N i+ F8 E N4 L5 H [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or+ E/ n8 R) a: y$ C# q# f I. Y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]: d7 v1 j' d8 i, l
set intersections roads with
7 E, K; s* Y/ j) T! V% C& w/ E [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
* q5 m7 \+ ^! C/ X* \) i& U (floor((pycor + max-pycor) mod grid-y-inc) = 0)]/ L! l9 _# ?8 r5 t2 o% e# `* K
, c8 I' e+ p2 h5 n1 V8 |# \
ask roads [ set pcolor white ]8 k! H+ A. y# l/ f
setup-intersections" `. \( J7 x5 A8 L) W
end
" [0 A% l$ N/ n: U% i" V4 H其中定义道路的句子,如下所示,是什么意思啊?
3 ^$ Y9 f& T( A set roads patches with
4 \& y" k/ u; k1 B" f* j0 G [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. D- Y& ]2 J4 V( j8 G (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: y! T; q/ R$ N: R: N
谁能帮我解释一下[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0)是什么意思吗? |
|