|
|
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。
7 A' i; v F/ i z" rnetlogo自带的social science--traffic grid这一例子当中,' j8 R+ S8 f% W7 o' w! Q
globals7 b% u8 }0 h. S
[. e' ]" I9 p6 ?
grid-x-inc ;; the amount of patches in between two roads in the x direction
2 t& H& w, B$ _9 u3 l4 G8 K$ E) P grid-y-inc ;; the amount of patches in between two roads in the y direction) h4 S8 i5 p( q* ]1 k2 }
acceleration ;; the constant that controls how much a car speeds up or slows down by if
; K) r% [3 q+ J3 P- d ;; it is to accelerate or decelerate. q/ n3 _6 o' U4 D
phase ;; keeps track of the phase8 p# V' |/ y5 p- \, X
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
) A2 K, k4 d$ K+ k) V. \ current-light ;; the currently selected light
; q% b, S5 N: n' B2 J0 s, o5 J* l2 @2 T' O! B
;; patch agentsets# o I% ~8 g# T: ~1 l
intersections ;; agentset containing the patches that are intersections& a1 P/ _1 r! r- X# h& @! G) E9 a" a& e: n
roads ;; agentset containing the patches that are roads
8 e* K4 N) [+ f( U- t% g]
) B+ X! L- Y4 G4 U1 {; E
6 U/ S' r7 q7 Q J w0 F9 ^turtles-own
9 ~) P" R& w; _$ a, S! D1 N[
, P& j$ F" C: t" Q- ]! m0 ] speed ;; the speed of the turtle! l$ J9 }' `0 s
up-car? ;; true if the turtle moves downwards and false if it moves to the right
- M3 j+ w2 x$ F( G) W4 m wait-time ;; the amount of time since the last time a turtle has moved! {! O8 {" [( K6 j2 B$ R
]9 [* q' `& l$ R6 V4 E
& G. K. `; j: o3 v9 Qpatches-own
- x3 p, @8 a4 u0 @* x) Y, }$ W[
4 r9 q; A( }9 \% Q& { intersection? ;; true if the patch is at the intersection of two roads
3 p6 J( x' H: r$ H! q green-light-up? ;; true if the green light is above the intersection. otherwise, false.
" t! M W- c+ P! g6 @; g2 f% H- G ;; false for a non-intersection patches.
" t7 I; a, e; ~ my-row ;; the row of the intersection counting from the upper left corner of the1 e2 u, \7 H8 R
;; world. -1 for non-intersection patches.
* `. _% q2 ?, z0 b, O2 x my-column ;; the column of the intersection counting from the upper left corner of the: R& N) p2 p5 q l/ ^6 F
;; world. -1 for non-intersection patches.0 r6 M" M5 h* v' s' u) u
my-phase ;; the phase for the intersection. -1 for non-intersection patches.1 ?+ l+ H3 J; U' Y
auto? ;; whether or not this intersection will switch automatically.
! c+ l& ]5 V! C1 W# S1 P9 { ;; false for non-intersection patches.8 q# O1 H6 {; }4 m8 P/ H
]6 U2 ]3 \% p8 v; E
, V% d. O/ ^( [* z8 ^$ _5 d
0 g( \+ ]2 B) G5 f# P5 ~;;;;;;;;;;;;;;;;;;;;;;
h `0 U9 ~# h% B4 g: _;; Setup Procedures ;;
' P- ?7 `. q; Q;;;;;;;;;;;;;;;;;;;;;;
' G1 U5 t0 l7 f; J% v1 S- G% K0 ~ z" [0 D
;; Initialize the display by giving the global and patch variables initial values.
6 ^0 B5 T5 P5 ~1 `& _;; Create num-cars of turtles if there are enough road patches for one turtle to
! V. l, `2 K1 ]5 L$ [! a2 M/ N;; be created per road patch. Set up the plots.
0 C! {7 p h: kto setup
' l5 T& F5 W. H" [/ f& y @ ca0 P* Q( j; W/ @8 L0 Z2 s( d
setup-globals ?% R& s2 o! M: s" \9 G- m$ O
5 N) b% t4 T" y: o9 g) B. _; F
;; First we ask the patches to draw themselves and set up a few variables
' K+ a% Q; X3 `' l/ x setup-patches& f$ R9 b/ j9 ]! b
make-current one-of intersections
; R8 L/ c" n' F, S& v! s label-current; Z8 a8 F! `: l3 y
0 z( G6 Q5 {' e, K# m1 y, } set-default-shape turtles "car"6 P- E; |2 @/ {' x
1 u( d) v1 ~+ N$ u8 v if (num-cars > count roads)# s9 h* L0 H4 ?2 A/ Q/ T
[! y7 w G5 T" _$ h) B
user-message (word "There are too many cars for the amount of "
+ s+ d i/ I& M v* t+ `1 w "road. Either increase the amount of roads "# r; h0 x! C9 |4 ~
"by increasing the GRID-SIZE-X or ", T. ^& u x/ [$ v
"GRID-SIZE-Y sliders, or decrease the "
" G- l) P, O' j "number of cars by lowering the NUMBER slider.\n", H; L3 z% v; t2 i
"The setup has stopped.")' x( U, G+ T0 W5 |
stop" U) T) ~* J2 u) Y# R" {7 G8 E* R
]. k+ S% ]+ J+ v# _0 {; i
6 z* A) s/ \' S/ W: Q% g
;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
; m( X+ V F. `1 V# \( ?2 j1 i crt num-cars
. k" @# Z+ v* C! a: E' Z- N5 d [
- u8 f3 c- t4 b2 s6 K setup-cars k$ U& E. I/ v* s* `1 t
set-car-color2 E* A7 w$ N4 ^
record-data4 a0 Q* _# w5 [
]
# T5 n# T( x* A% ?% Q! o! ~6 x: _+ n' S3 Z V
;; give the turtles an initial speed
: J$ h# } C, c/ `) I& r ask turtles [ set-car-speed ]
/ }$ P- z6 ^* [" H0 T& R. N3 J, r& q- S) W$ Q7 e+ B
reset-ticks& W; k/ I' |1 ~; b
end
; s' L$ w2 S1 Q; b% n8 Z0 h8 `
$ t1 l, D1 Q) a5 t9 K' n" F;; Initialize the global variables to appropriate values
G2 {+ i8 l0 C0 {to setup-globals
' f% l; P9 G$ n- u) o2 D0 l set current-light nobody ;; just for now, since there are no lights yet6 H2 `7 z# K# s- Z) V
set phase 0- ~6 ^/ V' T/ P- o* \
set num-cars-stopped 0
P5 h N, Y$ e$ N: O7 N- [ set grid-x-inc world-width / grid-size-x- m, p2 `) y& Y0 O3 @' y
set grid-y-inc world-height / grid-size-y- v$ i2 |2 l; t( u
8 @9 P7 t5 l. Y4 e5 K' n
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary' Q# F$ k, x9 P2 F) h. B
set acceleration 0.099
# N8 p1 p- Z- W" Tend
1 B5 @$ }/ b0 l/ a
/ Q& D9 u m2 p! [9 U$ Q0 x;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 y( c! A9 u n$ f' e$ D% d
;; and initialize the traffic lights to one setting7 o# m4 F5 {, B
to setup-patches2 r5 s; z( I+ I& F6 E
;; initialize the patch-owned variables and color the patches to a base-color( Q) b) N$ G! b, ]
ask patches. `4 ^! ^, o5 j& w7 i
[
1 f% P" i: R( \, I; ` set intersection? false
# Y' K4 F7 B* m$ h2 ~/ a. n. N& } set auto? false
4 S) @+ I6 M' y% U1 U" E) H set green-light-up? true: z8 ^, P5 D2 e5 U# N$ N
set my-row -1
5 |( s \% w% U) _ set my-column -1
, J% b% P! I4 T set my-phase -1& \, s5 h. i! Q, j- S
set pcolor brown + 3
4 J/ o1 F# U! i* L ]
9 g2 l- x; a2 a0 o* ~! K. U) e
X/ L/ o9 J" c* O6 I ;; initialize the global variables that hold patch agentsets) V( D3 }) l# S0 ^9 W M$ e
set roads patches with! T7 e5 E! n+ K& M' C
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or( E5 l/ S( [" ]' f1 ^; x2 \1 s
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 s! S s3 C+ v$ a h, d# R6 A set intersections roads with4 F+ l6 V- c. l& X) |
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
/ O, C$ u$ e& |4 g" J (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
) r6 Z. ?4 M9 w6 Q1 J. R2 J" G
ask roads [ set pcolor white ]4 ?' E& t$ q$ \+ n' s
setup-intersections
& W9 j& V; Q' J# c7 Nend0 b3 V: u* |; C# g. F/ H+ I# O
其中定义道路的句子,如下所示,是什么意思啊?2 v# p" u. T" o; k `: v% h% ~
set roads patches with; b! C7 T9 g% Y8 Q% n4 s2 u# u* w
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: y$ l) r, I i
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
1 e6 ? \+ H3 g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? |
|