|
|
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。
+ [$ I5 y6 f0 D- u, \) @( Qnetlogo自带的social science--traffic grid这一例子当中,; o, ^# U+ M% _: g, i# a
globals
0 C1 S5 V; Y# r' a3 D[
6 E y0 k0 k2 u# \ grid-x-inc ;; the amount of patches in between two roads in the x direction
9 N6 c; w, L7 d$ w$ f grid-y-inc ;; the amount of patches in between two roads in the y direction
/ B- O2 h$ \( c' t( q4 e acceleration ;; the constant that controls how much a car speeds up or slows down by if
( X1 g- j% t+ L. s: ? ;; it is to accelerate or decelerate$ n# o% @( o; s) g& I
phase ;; keeps track of the phase+ ?7 c3 Z6 a2 ]' P
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
: @8 f: }) {& a; r# r1 | current-light ;; the currently selected light
" F1 D" o# F: s) ^5 H+ k+ K' [2 I% n7 j7 S
;; patch agentsets
4 F5 N# j# ]$ ?+ X' x6 T7 c intersections ;; agentset containing the patches that are intersections
$ [7 u4 W+ F! v& d5 `) B) a roads ;; agentset containing the patches that are roads3 T6 W/ A w7 E- R. i: \
]% q- \* `& v6 C! v
' b) j" \1 f# x- E# m2 O: W5 P2 b+ T: }4 Tturtles-own# z8 g5 P' M5 Y1 V6 _
[! G9 N4 T8 K4 o5 h9 x- E# s
speed ;; the speed of the turtle
/ i- Q) j' m& A; E4 N# N up-car? ;; true if the turtle moves downwards and false if it moves to the right7 ?0 r* C' J0 X: o" R7 m" c
wait-time ;; the amount of time since the last time a turtle has moved+ [# v: i+ h: @2 U+ L5 G/ B7 V
]
5 |0 V: v, R: w7 U. `0 F3 \/ P! m& ?) i& U9 q9 y& \3 r
patches-own
! |( z! Z+ ^6 L2 V4 v6 w[
8 G, | F- T( v) { intersection? ;; true if the patch is at the intersection of two roads
8 t; _ e5 K* ^ green-light-up? ;; true if the green light is above the intersection. otherwise, false.' S& ?& [) n2 Y: n3 x
;; false for a non-intersection patches.7 V! f9 d- Z! v, l3 X% G/ f
my-row ;; the row of the intersection counting from the upper left corner of the
n1 v3 @2 N8 f1 }8 E9 Y ;; world. -1 for non-intersection patches.
, _* b- [+ J+ _, W8 Z my-column ;; the column of the intersection counting from the upper left corner of the
1 S" R# Z! k. e* r4 q+ S: G. y ;; world. -1 for non-intersection patches.* s$ n% J3 p g2 u& o, g
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
2 i" B% T3 F! z auto? ;; whether or not this intersection will switch automatically.
; I2 N- K5 M. V# | ;; false for non-intersection patches.! C3 Z- Q+ a0 e
], U7 E/ P) N+ U* R) I
- B: Q0 t0 _; }; T8 h- ^, V
. u0 s% r; b: L+ y& D* b;;;;;;;;;;;;;;;;;;;;;;; L* l, p" K( y. i' |% I/ |1 Q: t! s5 y9 s
;; Setup Procedures ;;+ b: w: j7 D6 u
;;;;;;;;;;;;;;;;;;;;;;
- [" M8 w; z3 ]. q5 [7 m! K' S f8 C/ t# u' e* |% t
;; Initialize the display by giving the global and patch variables initial values.3 Q) a, S# ^* | `4 |
;; Create num-cars of turtles if there are enough road patches for one turtle to
2 G+ m0 D$ X" O8 v6 M# a;; be created per road patch. Set up the plots.
7 g0 }: q8 o8 m) H# Yto setup: T& V4 A0 J# C% K
ca2 i, ^8 ]6 G$ r% c( r- x- j
setup-globals
6 R' n9 A: C0 F- z; C" Z" f, c/ d+ h! L+ e' G* ~! z; `/ h
;; First we ask the patches to draw themselves and set up a few variables7 g3 m+ {3 G$ d0 H0 l
setup-patches4 d% f E$ L2 q' n: [
make-current one-of intersections* `3 g3 z* P" l
label-current4 `* W6 Y4 g; R! x
& s l+ V7 Z& `! U
set-default-shape turtles "car"
, O1 y! ?5 N( P! i! ?8 o! ~
" K5 I3 V# d$ N$ T6 I0 z if (num-cars > count roads)
7 B8 b/ u9 V/ G) Z: m7 W6 H C: C [
0 n i, Y6 M/ G3 ~# Q user-message (word "There are too many cars for the amount of "
$ |8 G" o, X+ h" }& F "road. Either increase the amount of roads "
1 V4 h) Z k% b8 Y4 N "by increasing the GRID-SIZE-X or "( X: l Y0 D" p7 X) n
"GRID-SIZE-Y sliders, or decrease the "7 b& y3 ^+ t- h, h9 A, s. g# c
"number of cars by lowering the NUMBER slider.\n"# f/ D4 t( B' e f+ p# j# ^
"The setup has stopped.")8 Y' J: U x+ E) f+ b# v R
stop
" E: M; R* `& t" H+ @7 e( c5 m ]* h# t* d, q4 ~
: L& l& r! j. s, |9 u ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
! M$ i" ~5 V. ~1 e) q5 D crt num-cars5 k$ w" e- R" E! d% m W
[
4 ~7 Q0 Y1 T5 m( K$ \2 j7 O/ t! z9 N setup-cars! x" h( f" R2 S
set-car-color6 o4 t( _$ v& [+ k
record-data
' M) q$ \9 O w& P1 v+ ?# Y% O+ U7 [ ]
# J; h9 W) @& X7 D
7 a' X& B7 q V: h5 K ;; give the turtles an initial speed
5 t+ C# M# H* V g7 |$ I ask turtles [ set-car-speed ]8 a& z, Q& p' |1 |
6 ?0 [7 Y: m* K3 i
reset-ticks0 J* B9 R0 W0 P- I6 b/ X' o
end3 B* h* q( _; s. B
8 w0 C8 F8 T$ x5 R
;; Initialize the global variables to appropriate values( i. d+ k4 D5 k& x* M3 a
to setup-globals
5 k' G; c, U+ @1 h6 ^( C$ h8 j set current-light nobody ;; just for now, since there are no lights yet/ _* [3 l- r( ~" T
set phase 02 {' q ^# N; I
set num-cars-stopped 0
4 g! a4 f; X5 ~- F. N! z* ]% U+ G set grid-x-inc world-width / grid-size-x
f( i) Y# |3 p0 ?4 h set grid-y-inc world-height / grid-size-y
: H" l0 w, E u0 {: }
( @% }; c' Y# c: K7 y ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary3 i9 c; p% Y3 z5 K9 p
set acceleration 0.099( L; H5 r7 g* s0 V
end/ k3 g% p7 Y% o: E O
% U1 C" ]* }6 i8 X' @;; Make the patches have appropriate colors, set up the roads and intersections agentsets,$ v% |+ j+ L2 Z, G! ?6 G
;; and initialize the traffic lights to one setting
2 J2 }3 W- o* I$ H( m9 gto setup-patches, ^1 S) b* q' A
;; initialize the patch-owned variables and color the patches to a base-color
7 Z, T$ J( b( @& E6 o1 S ask patches z. @4 f" T# z' f8 c
[3 r9 Q* F$ f# P7 m% @( F0 r8 I
set intersection? false
, t% O: r0 s8 U+ p set auto? false, K$ B4 ]1 y' V! h* j! F
set green-light-up? true
, B0 D9 {1 q& ~+ x* _; s set my-row -1; V4 w, D: v; K' M
set my-column -1
5 E3 H6 ^8 F) U8 J4 I1 t' V set my-phase -1- Q5 O7 r: H( o
set pcolor brown + 3
! o% V7 D- A* r, F0 v ], O) i! p* @" n( t' h
4 p6 N" v7 v4 v* z9 G, U. U& {3 z5 [. X ;; initialize the global variables that hold patch agentsets
9 i1 d) K# V4 V) u4 d9 | set roads patches with
9 s* v) v' F Y0 r1 H [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 f! ~8 e N3 M, w* X (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ l( A* r0 R C! }$ y set intersections roads with$ r0 {' f2 S" d, D; y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
7 t! e' `/ i& x# y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 J9 `/ s6 [; }, B3 t5 Q
9 f, ^( A" b. T T ask roads [ set pcolor white ]2 C. e# V% y) e" C8 a$ L+ r
setup-intersections
0 Q; N; q8 v) n- ?5 O$ q( v$ y2 Send
# l. p+ l/ P" W- ~其中定义道路的句子,如下所示,是什么意思啊?
' }4 J$ r" q9 ` V8 |- _ z5 H. h set roads patches with
- Z7 a: }9 s8 W4 b [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( d" |4 ?! X2 s8 l* a$ V
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
! e( }4 m" u& F9 R1 E, d& [2 w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? |
|