|
|
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。* D$ ]! i2 G. K2 G5 ^+ b
netlogo自带的social science--traffic grid这一例子当中,* k; b! R, `9 h2 s; P
globals
3 O3 `( f/ @! X( ^% c8 b: V[" p3 e8 Z. W9 @8 _' Z3 k+ a ?/ R
grid-x-inc ;; the amount of patches in between two roads in the x direction
+ h. g- h+ L4 x2 ] grid-y-inc ;; the amount of patches in between two roads in the y direction
& I: _. K& F% T7 H' \ acceleration ;; the constant that controls how much a car speeds up or slows down by if3 I+ |' d- ]& ?
;; it is to accelerate or decelerate ^$ ^$ n" R' |0 b; ]5 I
phase ;; keeps track of the phase/ g, s+ |' p$ j: v0 o. g
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
2 h9 L3 c# t2 d5 ~0 P current-light ;; the currently selected light, g2 {- x- M5 T7 \
7 ^0 }2 T1 E! f
;; patch agentsets( h3 ]5 x! G" k9 ?. C
intersections ;; agentset containing the patches that are intersections* k' [8 |1 C+ ?" _0 z
roads ;; agentset containing the patches that are roads2 @6 _, E2 I: p, M! m
]
9 s8 n/ v# p" T! }# d; ]* c# A( {4 u3 @# I3 i
turtles-own7 u6 J5 S( O0 L$ Z9 I4 J
[
% b. t8 y+ y* B4 P% K6 U speed ;; the speed of the turtle
% ~# c8 i- E( A- |; D& F% P; E up-car? ;; true if the turtle moves downwards and false if it moves to the right
+ c( Q8 x8 w+ u7 e* y" C. d! o: V0 w wait-time ;; the amount of time since the last time a turtle has moved
% ^, U/ d, n" b" f] v* f% u4 T2 R4 W! S
, V: V& f/ W+ G% k: Z7 t3 x- Lpatches-own
3 T( Y! f3 [4 r[
9 Q' O9 D2 M7 b/ E intersection? ;; true if the patch is at the intersection of two roads/ X7 s3 \" `( M4 ?% ~' d" f: A7 u
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
2 }+ f' C* y* D" [- m ;; false for a non-intersection patches.# ?) |; y+ {2 N) a! y% C3 B
my-row ;; the row of the intersection counting from the upper left corner of the
3 \# h) \8 i, E ;; world. -1 for non-intersection patches.
! t# L- g7 z) u3 d my-column ;; the column of the intersection counting from the upper left corner of the% D) x% Y! k1 Z% V+ r/ A( Q
;; world. -1 for non-intersection patches.5 d4 D% }3 ^. y% i' A5 D
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
% y# Q; a' \* u& w auto? ;; whether or not this intersection will switch automatically.: Z$ b: H" W: h. P" K2 G
;; false for non-intersection patches.
+ t% J% `& S: h! v& l0 D]$ A2 f9 ?, T5 L4 _9 i
. o% y5 T+ I5 h! Z+ t0 m' E1 P: |6 o6 p( U3 I S2 O4 O
;;;;;;;;;;;;;;;;;;;;;;* n& A1 |0 ?+ T/ s% Z
;; Setup Procedures ;;( U" b% R1 f! P5 R4 v
;;;;;;;;;;;;;;;;;;;;;;
6 \) S) Q U' e/ ]5 N3 x0 Q; c$ P. e
;; Initialize the display by giving the global and patch variables initial values.
7 ^* e: T6 t2 [7 ]9 d. t6 _;; Create num-cars of turtles if there are enough road patches for one turtle to7 X' ]1 g2 @, y) N: q I1 h9 i
;; be created per road patch. Set up the plots.2 p1 n% v+ z; K7 S0 Z9 m3 B
to setup. @ ~1 `9 ?+ P% G
ca
6 I) F+ y* x% [; t8 F/ ~9 Y setup-globals
! G* R: p! @5 B4 i( b; h- r) L# k7 c/ d9 Q' Z8 d! }
;; First we ask the patches to draw themselves and set up a few variables
. d8 H# |5 U l+ B& F8 | setup-patches, n$ s/ b, N' f c3 w) h9 _- h
make-current one-of intersections! V6 Z- _! Y" @6 R
label-current+ ~2 o& e: a* S6 M
2 Z4 [' M" i7 g6 K set-default-shape turtles "car"
# h) u) Q; B4 f1 T; B% M. s7 S' Q) P0 i/ m8 a' }. g
if (num-cars > count roads); }) y* E1 M- m3 f/ S1 _) P
[
# E" l4 q2 d% s" `% O) l) I user-message (word "There are too many cars for the amount of ", c1 G9 t9 P4 {/ z a4 L
"road. Either increase the amount of roads "6 w* c1 S' ~* H
"by increasing the GRID-SIZE-X or "
9 V e3 u. l, L* q "GRID-SIZE-Y sliders, or decrease the "
) z8 u4 N) b/ U" q1 Q5 i "number of cars by lowering the NUMBER slider.\n"
7 [! Y4 M& b# H7 C5 m; \ "The setup has stopped.")
9 l7 h. o. D3 ]+ z9 I, W stop
$ k/ Z! ~/ c0 S& a8 g ]. x4 H( V* {2 q1 p
& |9 ?7 _" X# g5 G
;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color! u% Y% S8 v5 C8 v+ r t
crt num-cars0 r9 m5 Y9 S4 g0 Z! t2 H8 E
[
! p9 ?# B% T# ]3 g6 s! \ setup-cars8 L0 J# z: `, y3 P, P, }2 y* @
set-car-color% {) X7 D' q: p/ a3 i# p5 T( k* G- y
record-data
& m7 P1 P7 `, |; @: C+ g7 w$ J; Y ]
" Z: ]1 n" L. d0 `" D% m
# v x6 ?3 P' x ;; give the turtles an initial speed+ ?5 }. Z+ [- Z( Z: d, W% v
ask turtles [ set-car-speed ]
1 X# |# ?7 ?+ I8 P
5 A y5 A2 ?6 h. p+ ? reset-ticks- D) E$ {( c+ ^0 o. h
end6 \8 n/ G% }; U: u4 `9 M$ M
% B) S* j$ w* Y1 Z9 e
;; Initialize the global variables to appropriate values
, ?- F2 y+ e% f% l9 pto setup-globals8 Y- d: f1 P; B3 [% j
set current-light nobody ;; just for now, since there are no lights yet
8 z9 e/ z! C0 v5 P. e* ?0 C set phase 03 v; S4 A" O* v& S+ E
set num-cars-stopped 0
" O% Y2 O% }' `* v! }) |0 d set grid-x-inc world-width / grid-size-x
) h) `4 w1 x) ] k1 a8 s set grid-y-inc world-height / grid-size-y
5 f4 R0 U, Y3 L! i) r1 a
8 T( d1 x# `7 s8 g z6 J$ X ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary, ~4 E% t3 e D
set acceleration 0.099
9 H, j$ V4 b3 z* f; g6 Cend2 U3 F3 D. y" T: y' P
2 k! f/ T1 s8 f1 b$ e;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 j& g1 N' g) v5 a- v% b% H/ J( o
;; and initialize the traffic lights to one setting# ~% B7 a# S$ B7 e
to setup-patches9 A! o0 }) ~$ o4 G! y! ^
;; initialize the patch-owned variables and color the patches to a base-color l$ H% q$ `. s+ {! E4 x& E5 H% i C
ask patches
4 A3 {- x/ Q0 Y$ j$ m% l4 ]+ O [
, j' ^7 X& o+ q# Y3 u N Z7 N; k set intersection? false
5 R# z' Z0 ] {! \ V set auto? false
: u4 o! {3 e5 [! n$ e9 ?1 F set green-light-up? true3 S& ]" A$ ?" C7 t- M' v- B9 X
set my-row -1
; H: u4 Y5 w' f- D3 z9 u set my-column -17 O Q9 I* q$ w% z q
set my-phase -1# a; O: [ S4 u& ?9 B8 b. {
set pcolor brown + 3
L/ K) W. I5 }4 v- g: G ]% U# M& W3 ^ S% i2 \* u: }
. Z9 d9 S7 ]- V- K6 W9 Z- T/ @ ;; initialize the global variables that hold patch agentsets
' I0 H' P) f4 H) V set roads patches with
% t0 G& [# t' \6 I. n8 ? [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; z; Y- P! E0 u0 u (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 B( P% v/ g) x+ S b; K0 S set intersections roads with. S: j9 }& ~# h4 L& s: m7 G5 j
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and# Z# U+ D; p; D1 Z) g1 y/ z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; h% l0 Q( _. f" H; B" u1 r5 L8 ?) y/ t! `/ S: G6 f! d
ask roads [ set pcolor white ]4 b& @0 r+ ]" A! `, i, i8 d9 a
setup-intersections6 k- M" \' _# `5 O+ A
end# J8 @& `8 V% R, V( a+ G
其中定义道路的句子,如下所示,是什么意思啊?9 ]8 M! K! B8 V, b) W
set roads patches with) I& i- L' \# c# C( N
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 s Q' E1 Y' Z3 M$ i# V* C (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" E: a. R m5 H* b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? |
|