|
|
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。
: @0 L; ^; r+ Bnetlogo自带的social science--traffic grid这一例子当中,* N8 }* Z/ ?; I0 l
globals
- K9 ]: d8 f$ s+ a# H[& o) F: @0 u6 f _/ o2 V: ~
grid-x-inc ;; the amount of patches in between two roads in the x direction
0 W+ O5 k/ K6 W! f( [ grid-y-inc ;; the amount of patches in between two roads in the y direction- }7 Q- w) K* Y( R- [
acceleration ;; the constant that controls how much a car speeds up or slows down by if( d w* R% f* T. Y
;; it is to accelerate or decelerate4 c$ P# {* F) A Q+ J- P/ h
phase ;; keeps track of the phase
* \( G/ [5 W0 }6 ^. K6 n num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
; V* b# A" r% Z current-light ;; the currently selected light
0 G8 k7 {" m+ {& F2 x3 A4 K4 v, s
;; patch agentsets
; K' C# O# e' z. Q1 I! o intersections ;; agentset containing the patches that are intersections
7 l; o& w: G/ b- ^1 J roads ;; agentset containing the patches that are roads
8 @5 w' k+ M# b" p( r]
: J; O. o% D2 L! G$ N+ g! }: D" u% D
; H$ L0 F! z( L4 {( X) J" Hturtles-own
/ ~8 D8 v7 R: Q2 ]1 {# s$ P n[
9 ~' x: ]- P1 l% i# Z speed ;; the speed of the turtle
2 |) t9 P: n9 G up-car? ;; true if the turtle moves downwards and false if it moves to the right7 p) Z7 J3 P) t
wait-time ;; the amount of time since the last time a turtle has moved& W) n1 x+ W1 F% B# ` B
]
9 Y4 V$ q; l" B9 A0 J3 u8 W2 S$ ~) `& }+ J5 J$ [
patches-own
5 M) ^- f: o" c ^0 e. v8 ]; t[% u2 s+ D$ Y) D1 o
intersection? ;; true if the patch is at the intersection of two roads
1 ]; `, |8 W3 V2 V) D green-light-up? ;; true if the green light is above the intersection. otherwise, false." [4 m: g$ J% W" M; t# E( k1 }
;; false for a non-intersection patches.
: R% `7 U0 Y( ~; @ my-row ;; the row of the intersection counting from the upper left corner of the
, `0 `5 \# w5 E4 X) J' b! O ;; world. -1 for non-intersection patches.0 ?+ j- U. ~+ G { J/ R" |; {
my-column ;; the column of the intersection counting from the upper left corner of the
, t8 G K9 K0 i+ R; d* _& ~ ;; world. -1 for non-intersection patches.4 J, k% w3 m8 x' @" l9 y9 p J
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
" D" Z% i0 ?4 t" T+ ?! B auto? ;; whether or not this intersection will switch automatically.2 b, T, | W' Z" t/ X
;; false for non-intersection patches.
3 l/ Z; \! x0 `% Y/ s]
0 p b6 Z' J- y+ A' R
Z/ ^ T, Z! u, n- G! U- {" A) {2 r8 |3 |# n
;;;;;;;;;;;;;;;;;;;;;;
0 E# N2 b5 q! r: t;; Setup Procedures ;;/ u& n& Y2 y& ?% Z3 k w( r
;;;;;;;;;;;;;;;;;;;;;;
9 U4 y& j7 k5 ]
6 `2 E* W! `0 a% i;; Initialize the display by giving the global and patch variables initial values.4 X# |) X: {& n" X6 d
;; Create num-cars of turtles if there are enough road patches for one turtle to9 o. }& l. m1 z3 o: T4 _
;; be created per road patch. Set up the plots.- g' e3 |( z7 q
to setup. N& a' \% e/ p R' Q, P
ca, ]8 j( E) J* L; ]' ~
setup-globals
2 R. r! _: o( W; V y. g$ T* Z2 L; U
;; First we ask the patches to draw themselves and set up a few variables
( I1 q) x' A' P5 E0 | setup-patches
9 g2 H! v1 x8 T k4 ?7 e% T make-current one-of intersections
( n) ?8 t- F8 a# V label-current
& _7 o r A: L+ K) d& C, o8 j( t8 {% g _) \5 Y( |0 b
set-default-shape turtles "car": Z6 H5 K* r3 W0 Z4 t/ p
& [5 f1 V" |% L( ^- L4 V if (num-cars > count roads)
/ ^" I+ y: V5 |3 ?5 G [
1 B# Y3 G2 l- N user-message (word "There are too many cars for the amount of "
7 P; R! O/ G3 L/ ^5 g, q. O' U "road. Either increase the amount of roads "
9 o+ l4 k1 S: ?$ X! h6 C "by increasing the GRID-SIZE-X or "( {5 V0 y0 E/ t$ p1 W/ G4 z( |4 q
"GRID-SIZE-Y sliders, or decrease the "
+ Z- ?" Q; s) v% X* u( c4 Z* B+ q0 A "number of cars by lowering the NUMBER slider.\n"
4 C' w- K0 z# R% z" F "The setup has stopped.")1 l% f# ~ Y$ v! F* Y J' O
stop) A+ q) G. y4 |7 g. \5 c
]
) I* {; e8 |+ b3 |( l4 {5 s1 `- G8 e& |5 e3 U2 w6 e* e
;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color' ?: u# v0 B& C' O
crt num-cars* O5 C! Q7 g* @7 A
[
- K3 ^2 l0 x: E% J2 e setup-cars
! r- r" e6 T8 i' B9 e3 o- @ set-car-color
% N- O. W. j# ?( W* f record-data: M' H2 [/ G7 b, B6 Q4 C
]9 Q( }; l C. d- R, I
$ C! E1 J: o7 u; i! L7 s; W6 b ;; give the turtles an initial speed
, B4 {6 y; g' v! t' C8 B0 E" @ ask turtles [ set-car-speed ]! N4 c0 k) F3 a" H+ I
! \# L+ ~, M R# d' q* L" O; P reset-ticks) b. ?% p6 Y+ X. W, {# a: |! e
end
& d& D* M2 S Q3 x+ B* c" G$ K
' Q9 o8 z# L4 C8 |;; Initialize the global variables to appropriate values# Y% m* [5 t# Q6 v4 {
to setup-globals
2 k* W5 ]& e% v2 p; o set current-light nobody ;; just for now, since there are no lights yet1 y9 P7 b- e6 |# ]
set phase 0
6 P, k/ w; a9 O5 g2 x( I set num-cars-stopped 0
' W8 I. ?3 l$ |4 O$ ~. K1 B7 ?6 Z set grid-x-inc world-width / grid-size-x( @* \- P+ f. u* l/ t
set grid-y-inc world-height / grid-size-y
( m2 t3 z m5 m( ~4 f7 @* _# s, r: v, h" G) Q8 m" |3 d$ W
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
( d8 s) }9 W2 Z2 x set acceleration 0.099; A0 w. {- M3 D8 `8 E' b9 @
end
4 I; c) Y; H& ? m: F% L
" t" R7 Z. D" t( t, e) z0 Q;; Make the patches have appropriate colors, set up the roads and intersections agentsets,* {" m5 b; H; C+ _/ a0 ]: _
;; and initialize the traffic lights to one setting- h3 M5 B& d8 s' }
to setup-patches
+ t4 y5 M N ]1 P ;; initialize the patch-owned variables and color the patches to a base-color
( n0 `$ x! u/ l) b6 v8 v, D0 H ask patches5 I5 `! I% |' [
[
3 Z+ C$ W$ S5 P; H1 D set intersection? false
( c$ n* @' ?. @& Q. x; T( h set auto? false% t- d5 v& Y0 x) m% f
set green-light-up? true
- j2 O3 g8 r9 p K set my-row -1
+ [: S: v# T5 m$ [7 T1 K set my-column -1- S0 \ @* Q' S1 b- q! a
set my-phase -1
+ u/ D0 S* _# @& @" z7 u set pcolor brown + 34 e& g: w; T) p
]8 X9 y( A) E3 g4 K+ i
9 H+ W, ?' I$ ^& v. R ;; initialize the global variables that hold patch agentsets+ _/ J) W8 U9 c% ]
set roads patches with. |; g* a$ k5 P4 @
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or* J- H* |$ W h: h2 q$ ~0 @5 I
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]' i) R7 q4 O6 v0 P& L6 ?- @5 I
set intersections roads with% @4 D: d( i0 e- F. n; Z- g
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and+ ]' q2 P8 n8 T; e$ l
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
: D% E9 K7 ~* V1 `% m, u
" Q- G$ d& f/ V" f* A8 e. a4 G3 h ask roads [ set pcolor white ]7 ^; E# V3 s& A9 g% t. C
setup-intersections
7 W" E: r5 u i4 nend
2 o) _1 a$ [- x# O, b3 t其中定义道路的句子,如下所示,是什么意思啊?
, E- B3 {& Q$ r3 _# B set roads patches with9 H. m. w# E8 x" {. m7 D: C
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 R' W3 G: s8 K& F% ?( a- j
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 |1 s( `6 B* Z# k+ f3 ?4 g) G/ P
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? |
|