|
|
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。. r; F& [) T$ a2 |5 h; ?
netlogo自带的social science--traffic grid这一例子当中,
5 S/ x/ U8 w! Z1 d0 ^$ n! d7 hglobals
; m5 k0 P, H2 e+ j, i[6 i$ P9 z6 Z! e2 f
grid-x-inc ;; the amount of patches in between two roads in the x direction5 C' \& O# ?* Y8 n' v. u S
grid-y-inc ;; the amount of patches in between two roads in the y direction/ L9 X, |% V2 k' J
acceleration ;; the constant that controls how much a car speeds up or slows down by if
1 B2 I' p. v! I) K+ r; x ;; it is to accelerate or decelerate7 ~5 V) P8 ?4 t
phase ;; keeps track of the phase
7 Z* @) y% n! l num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
$ R# _- H0 D# f, L' M& o current-light ;; the currently selected light
4 s$ m+ i* W7 C( H
$ k4 B: G. i' B7 W C ;; patch agentsets
( m( P2 }( `* k9 C) D intersections ;; agentset containing the patches that are intersections
8 y( |* ~! B1 i roads ;; agentset containing the patches that are roads$ R- X3 @% h- i! s' z0 o
]; ]/ N& T, `7 m
4 \" [: O6 q& s2 u+ hturtles-own
. w1 U0 k x$ W4 S A* k[2 u; l( T/ E, ]$ y" Q& D( i" u' O$ e
speed ;; the speed of the turtle0 {( o4 m. P' m1 Y. Y( k6 V
up-car? ;; true if the turtle moves downwards and false if it moves to the right8 }5 m6 U$ S, u3 M
wait-time ;; the amount of time since the last time a turtle has moved" a9 X: o5 @- j; v+ ?% |( c+ E4 d
]
6 [$ `& V( v5 }) ~ G: l; h6 A8 @- j/ T& O ?! k
patches-own; i/ A4 u$ [/ e% Y6 A2 \" k
[' s$ ]5 j }9 F2 @9 w* O8 u
intersection? ;; true if the patch is at the intersection of two roads, k- t8 X- }4 P$ z1 Z& E- O
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
" {4 c1 I8 i# a7 a+ L6 T ;; false for a non-intersection patches.- ]6 k* N/ c* T8 I ~: A
my-row ;; the row of the intersection counting from the upper left corner of the% K; k# k+ b2 ?# [
;; world. -1 for non-intersection patches.
, [" c0 J) D+ q$ i3 @ my-column ;; the column of the intersection counting from the upper left corner of the2 q. t6 v+ h' w+ \; A% L* F
;; world. -1 for non-intersection patches.
- L$ s# z& t3 ~" j1 @& w5 @ my-phase ;; the phase for the intersection. -1 for non-intersection patches.& Z( L4 A5 \ `9 P* O
auto? ;; whether or not this intersection will switch automatically.
( q6 a: ?4 e3 t3 ~8 _; f1 q ;; false for non-intersection patches.* l% q: O4 q$ P- @9 a1 }( V5 e
]0 n0 S; |& R0 }7 M; B: d4 k
5 J' E6 ?3 i% R8 t, q6 Y* j4 J6 A7 k4 A9 C5 v
;;;;;;;;;;;;;;;;;;;;;;6 l/ s8 w0 C( T
;; Setup Procedures ;;1 k1 M$ `; X) L6 t) N) v
;;;;;;;;;;;;;;;;;;;;;;
/ ]$ W9 a# D* S# P' v1 l! q+ g& X" w: J8 ?- @% T; o
;; Initialize the display by giving the global and patch variables initial values.
9 P; y5 I6 u1 [1 k$ t3 O9 R \$ t;; Create num-cars of turtles if there are enough road patches for one turtle to7 r# E6 V; b- ]! `' }1 h
;; be created per road patch. Set up the plots.
7 e( U& z6 p3 n$ L: J% j7 D! \to setup# j4 D2 k4 y4 v+ f& b6 ?
ca
7 P' s9 L2 ?& R, F: I9 S setup-globals
2 S, L, ?/ F9 m9 f: s/ w- z
8 ] `# g8 {0 Y* F: D# o! I1 ^ ;; First we ask the patches to draw themselves and set up a few variables$ a& P+ c- C5 C- F' i4 F# U( s) V
setup-patches
8 B: c( |5 s$ g& w make-current one-of intersections" U; a+ q2 `5 K4 ?3 e
label-current
' y5 \1 x" h/ n5 W
) T1 A+ g7 f3 C; L set-default-shape turtles "car"7 x/ Z' S2 w4 L6 j3 y8 T0 E
. j& k+ a- X! s( ?, H if (num-cars > count roads)
7 d; n) c g# z: T [
' B. e+ h% A) O, u- g" Q, L user-message (word "There are too many cars for the amount of "
8 w# U) p1 ?" G. G h "road. Either increase the amount of roads ", V: o" F1 k f- n) B ]9 X
"by increasing the GRID-SIZE-X or "
, P2 p' {! A3 ~, R' M/ O5 t "GRID-SIZE-Y sliders, or decrease the "
: h8 ]7 R/ t& a& ?+ K- f4 m" g: Z "number of cars by lowering the NUMBER slider.\n"
; R9 h, p, f3 y" P. O/ ^# p0 [, A "The setup has stopped.")8 z- i+ y- _8 N9 I2 e" i# u
stop
" L$ V* ~, e8 d8 ]4 M; | ]" X! k; |& Z7 t$ @6 P6 L
3 K+ V# E/ X0 t1 P1 Q2 m' o2 B
;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
- A; P- D2 |- r8 X& v9 s( F2 S2 a crt num-cars
9 ^7 r9 ] C2 a2 R8 k9 e [
, h. k* w; S. u0 X: W setup-cars
' S8 R% j# `+ t n2 T; e( R1 k5 l set-car-color. G: P7 |$ A$ a: W; @+ o
record-data9 {7 J# X. y5 m$ |( O
]! ?# [1 T5 l; B+ `5 q- B
: z$ I: B8 Z0 y8 h6 C+ n5 n ;; give the turtles an initial speed
' d$ s( n0 U: ~" ?8 T% c ask turtles [ set-car-speed ]- `9 R- L$ V C5 S: _# V
3 n- W1 H8 a! |7 M- w reset-ticks, S' u% ?0 m0 S( t( ]( a
end) R& Y; d4 F. F$ }
+ C7 D7 Y, v( s- n;; Initialize the global variables to appropriate values8 e% U" n: z2 g
to setup-globals
0 k/ V$ f# |& C! i$ L! q: k& [ set current-light nobody ;; just for now, since there are no lights yet- {+ h; @- c! e: `8 L+ Z
set phase 0' f! F) @# w- q: D, N
set num-cars-stopped 0
! s1 m" f4 [! g7 I: W5 x; m% i set grid-x-inc world-width / grid-size-x( J, o( J) W; M- u, r6 \0 T
set grid-y-inc world-height / grid-size-y
% b8 a4 I8 a Q& G) m5 {" j; l5 y% w8 t3 e" ^$ E( l* C. F
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
7 |: }- {2 p H$ F( ?! ^ set acceleration 0.099
+ o# S5 K) f$ P8 g0 r4 Fend7 R) L2 k M! A& E+ x
- [" |2 ]9 }: N6 I) P& v+ \;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
5 L+ T' ?. G2 _$ i;; and initialize the traffic lights to one setting4 M( _$ X3 A$ v
to setup-patches
: z& h6 T1 k/ p3 k ;; initialize the patch-owned variables and color the patches to a base-color
1 z9 Z7 w. x7 N8 k, U ask patches
% L' Y, W2 p+ `* L$ r [* j, u( X0 x, \+ r# O
set intersection? false7 s* h+ t9 ]6 A! N7 s2 i3 z# B- l
set auto? false( c! N( y/ A7 ^* T, H; E. ^
set green-light-up? true
' \0 Q: w. u7 Z% k0 M/ y set my-row -1' u$ R! p m" z$ b Z" e3 k' e( R+ ?
set my-column -15 N" q( p: w8 ]+ I3 Q
set my-phase -1/ g6 s F v! H4 i
set pcolor brown + 3% U( ~$ }3 s6 a: N7 ?
]
# j, Z; p9 d; G$ M, `- y( s" g
4 M( u, U9 K3 X4 o ;; initialize the global variables that hold patch agentsets
; H1 r$ K. ^$ \ [0 i3 t6 _ set roads patches with" h" U( N8 z5 f0 {- m( u- t0 Y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 ^- Y# R d4 z (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 O, F2 ]- E7 ^# Y' Q# R* w set intersections roads with" \7 d1 E" X9 C, |2 B+ ?7 i' R
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and3 g1 c3 s3 i- g4 k- `
(floor((pycor + max-pycor) mod grid-y-inc) = 0)], B9 t, k9 q) Z6 |: W3 s/ s6 B
8 _2 x" R k" M5 K/ y+ u ask roads [ set pcolor white ]
2 k+ B' N: @" w3 S. d setup-intersections
. _- }$ p; j+ g7 v6 [end
* V( I0 H( M: t; x; b4 r9 W y其中定义道路的句子,如下所示,是什么意思啊?
8 T3 w+ ?; i' i7 F! h set roads patches with; t) |( E' ?5 I0 A5 M1 Z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
: G g" u n n" a8 j5 | (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% |, s" V6 g2 ^( k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? |
|