|
|
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。
9 g/ t2 ?; x( [, y* ^netlogo自带的social science--traffic grid这一例子当中, q0 K1 G9 Z& c i9 [# J! P1 F
globals$ D! j5 A. d5 h0 `0 F$ K' S4 _4 N0 h
[
. k9 n5 O, L. O& w5 K8 p) R grid-x-inc ;; the amount of patches in between two roads in the x direction
- n6 u+ P/ e4 T grid-y-inc ;; the amount of patches in between two roads in the y direction. X% A9 i( ~% b, j( t& }( ?
acceleration ;; the constant that controls how much a car speeds up or slows down by if
8 y# |4 x. i- [9 F ;; it is to accelerate or decelerate
/ [, r7 }* p# e9 Y' l- a phase ;; keeps track of the phase
- Y3 g1 E; X e; ` num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure3 S0 C- t! E5 @* ^' |5 I
current-light ;; the currently selected light( @7 x; p- m( g% e8 A. ~
: `3 b) I0 t8 N4 S- L ;; patch agentsets$ V" X# b( k0 Y, q9 E. Q
intersections ;; agentset containing the patches that are intersections
6 _% y& x" c4 Y. G3 S roads ;; agentset containing the patches that are roads
) [* k; D# n& X4 b& s, P' g]
6 e" U# \- O- }2 ?# q Z( [+ ~ E, t" L: e0 f
turtles-own
' k- S0 N8 J, A8 g) A[! W5 R- R M q7 f" b& D( F0 V/ ?
speed ;; the speed of the turtle. j) Y' k' I4 q5 H+ ?$ q# n7 R5 U
up-car? ;; true if the turtle moves downwards and false if it moves to the right
2 ^8 u9 R: H" R wait-time ;; the amount of time since the last time a turtle has moved( z# [- r2 K9 K, k* b" O
]. i* i b# b; Q9 z, w3 [
/ D# Y" R& c! h+ Q% [+ [3 ~ I
patches-own
: S) M8 `& d$ a! H2 R5 _! @0 ^[
5 o+ m/ ]0 F8 \% `2 c) `3 \ intersection? ;; true if the patch is at the intersection of two roads
( ~7 p+ Y4 F4 g: O green-light-up? ;; true if the green light is above the intersection. otherwise, false.7 n- i& z+ j' s3 h* K9 Q
;; false for a non-intersection patches.( H/ y5 I1 i. W
my-row ;; the row of the intersection counting from the upper left corner of the3 B+ D y+ `* I$ {' p
;; world. -1 for non-intersection patches.
- A, o# T$ [! Q6 n9 u+ M my-column ;; the column of the intersection counting from the upper left corner of the9 N1 t- r$ F7 q6 P, H
;; world. -1 for non-intersection patches.4 L8 W5 q0 @) |- [
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
3 D+ _3 I/ Z3 _2 H9 Q, _. ? auto? ;; whether or not this intersection will switch automatically.+ w- p4 q+ {, N/ R- w; V$ q$ `
;; false for non-intersection patches.; M D' B! ]6 E3 v6 c
]
* @* S) \# W/ C- r8 \0 t+ M5 }0 X }6 |2 N0 \, H' B7 M
0 `3 [- j4 t: U
;;;;;;;;;;;;;;;;;;;;;;
9 z* h5 J- U6 c+ v. C$ C;; Setup Procedures ;;
0 f: @5 i# V' X9 j;;;;;;;;;;;;;;;;;;;;;;
5 @1 k- j* N Z5 {5 Y* [
" g7 Q8 F2 d g' l- e;; Initialize the display by giving the global and patch variables initial values.
& R1 A7 ~6 [) W& {1 H;; Create num-cars of turtles if there are enough road patches for one turtle to( V2 X9 H0 Z# q. P
;; be created per road patch. Set up the plots.; g% k2 O/ N8 Q2 z& X
to setup
6 I- X1 V$ P; m ca
- u7 j" Z9 U' I. o/ h; e setup-globals% X7 q0 _" k4 g
9 v9 T2 x& P9 D: c* p$ n ;; First we ask the patches to draw themselves and set up a few variables
5 z8 ]1 O8 t: U$ ?9 [' F. ?: g setup-patches: ` }2 e a. f8 M4 K5 Z$ M& o
make-current one-of intersections
+ p, ?, H( d. P6 m4 \ label-current
5 s( i. S$ Y5 a% {% @5 @8 C/ ^
c2 W2 E/ E9 j$ U set-default-shape turtles "car"% s* B% y" P6 V! f, h
, R, N4 d$ W$ |& C$ l# y if (num-cars > count roads)
. |; P5 N# i$ h b6 U [
& l# h& n- |" z user-message (word "There are too many cars for the amount of ") w# E8 n4 W9 P I
"road. Either increase the amount of roads "
' r ] C/ C9 R "by increasing the GRID-SIZE-X or "
) @ H' O1 ^ q( ]) j "GRID-SIZE-Y sliders, or decrease the "
9 I) n2 G C8 |, k t! R/ Q V "number of cars by lowering the NUMBER slider.\n"
2 j/ G5 t3 m3 h7 M6 ^ g" f "The setup has stopped.")
, U, V. W9 y; {) A* {! i1 V stop# t: i+ S1 f* T8 {4 T
]& D2 |; ~* k+ o) N: I2 }
2 I1 k6 h4 d0 e
;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color1 t0 G9 u9 Y& n- l7 [
crt num-cars3 A% ?9 z6 ]6 G1 l/ H. L
[/ H$ c O! i3 g& B7 r l8 L, x
setup-cars
& G* F$ z" N f4 S' W set-car-color
; t8 v7 ~% k" {3 Z4 R( ~ record-data D0 A9 E8 c3 D, S }
]
# V+ I; Q2 E$ Y, `( M% H8 e, {# @. p& b; `! v" H6 C" |- s3 B
;; give the turtles an initial speed
* F" _. c& j$ _6 h/ q) y ask turtles [ set-car-speed ]
8 l4 Q+ i6 U$ q# i# ~' N
6 w3 J! E2 F# `* ?; A" o reset-ticks- t' j) y. O4 E) n) F+ ~' E6 X* j
end
/ q) W. D$ a0 D1 o& t9 `& c) _# A5 ^
;; Initialize the global variables to appropriate values
: |9 o5 q! m" f. [# ?to setup-globals
# }% c: f0 s2 d0 B set current-light nobody ;; just for now, since there are no lights yet
0 N* W7 w! q* u4 p4 }# y6 N, L set phase 0
) G+ x7 J8 u2 E+ C+ H set num-cars-stopped 03 i# _6 I) r* d
set grid-x-inc world-width / grid-size-x
S; f/ r2 b0 v- d0 H set grid-y-inc world-height / grid-size-y
5 L9 n2 M! Q7 E4 B# x; p6 r! J; s0 t; ? g4 L4 c
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
4 ?' y+ f1 @' A# O& v/ y" p" Q set acceleration 0.099
, C% [4 Z( i/ U% Pend
$ k+ q' Z3 M0 U: x- y, f$ C& i, x) M2 L6 ?/ ^ g
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,9 _0 p, P$ H' R; U. M. l
;; and initialize the traffic lights to one setting
" v- P0 N2 L) [, A# E2 o) Cto setup-patches- v d( R$ {2 f$ g
;; initialize the patch-owned variables and color the patches to a base-color
" I2 S$ J* \% B' B, s- @$ ?' L# a ask patches; `: s/ \' f5 `' R
[
( E2 u% R1 O g( Q0 q set intersection? false
a+ d1 k, T" M, x' e0 a set auto? false/ Z1 c/ K H( s0 H! K; V
set green-light-up? true5 Y. v O( X0 u1 K6 @8 y0 x
set my-row -1. U* \& X1 S6 V4 M) d+ G
set my-column -1
% X! l6 Y% K) d' W, v set my-phase -15 f$ O" j2 l; K0 R- I5 T' j& @
set pcolor brown + 3
, U w5 l( h- f- @' c& V ]8 w5 E+ A9 f: ]0 ?. _$ y+ ~0 X
* T& K: V8 u! U R) k# A+ W
;; initialize the global variables that hold patch agentsets; s+ P8 [4 g, s9 \: ~1 {( r
set roads patches with
/ i% j2 B7 _4 f( Q$ z. i [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
- k" J& Z, h6 W (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
% ~4 p2 k0 ]/ a7 b+ l set intersections roads with! r/ |) N) _5 E( v; n: C
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
, s0 A% |6 t4 B* }! a7 G (floor((pycor + max-pycor) mod grid-y-inc) = 0)]% C5 B3 @$ q. K( {* M+ d: m' w
! }$ [* r P) [
ask roads [ set pcolor white ]( W) G- p1 t$ Z3 [/ y8 h3 J
setup-intersections
2 T8 B7 P( T+ c" O0 fend
. ~: i3 T V& h" S6 u! }2 J+ t其中定义道路的句子,如下所示,是什么意思啊?
. m }" V3 |" U! G+ G& P7 v$ r set roads patches with
. s$ T$ x& \& m$ k# c2 B' u$ X" h! V [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& ^- G- h) ^/ C7 F* H: r
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* [& w3 x' d$ W; P) z! Z3 ?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? |
|