|
|
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。
" ?$ R6 A; P* C% d* w1 ^, lnetlogo自带的social science--traffic grid这一例子当中,9 M7 [9 T$ u; n( Y
globals% K% K4 J- I% x. Q& z, g
[8 ~" R8 D1 i( a0 V& b
grid-x-inc ;; the amount of patches in between two roads in the x direction2 \( i: w0 _, n/ k4 C; P- K
grid-y-inc ;; the amount of patches in between two roads in the y direction
' c0 `5 V7 w) P' ?+ Q+ `& x3 K& v5 ` acceleration ;; the constant that controls how much a car speeds up or slows down by if
7 P! L1 z8 ]; C- |$ H ;; it is to accelerate or decelerate% d/ S% \9 ]: V8 O! ]+ H& P y
phase ;; keeps track of the phase
& T: g. }" E; q7 [ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure; o- I6 s3 Z- d! h/ s2 U o4 H
current-light ;; the currently selected light! H) I& g$ e& p6 h
1 m% c/ }5 |+ w& [
;; patch agentsets
; S2 S' w. d/ d intersections ;; agentset containing the patches that are intersections7 {* J! @; t" y! p$ I
roads ;; agentset containing the patches that are roads
?7 R0 T: z% E+ q# O- P]
2 p) {& E" B, Y% h( N `8 l
% p: ^7 g1 A2 z Kturtles-own g$ B, L5 k; K9 R" m7 Y
[3 T& a9 _3 H) \# A/ r
speed ;; the speed of the turtle
3 ~3 Q6 I8 D- s' C3 m2 E: s up-car? ;; true if the turtle moves downwards and false if it moves to the right s' a8 T8 V- y4 k! }+ M
wait-time ;; the amount of time since the last time a turtle has moved" f% Q# ]8 @3 [' l' i
]
+ }# _* F3 R: p3 ^5 K9 h
1 A$ s- s2 l% q" i$ I' a0 m' X$ Jpatches-own2 |3 o" P: H& f8 E/ }
[3 z9 h6 z* u% i/ G
intersection? ;; true if the patch is at the intersection of two roads
+ S$ r, l* y. V! l9 f3 b; H T/ B b green-light-up? ;; true if the green light is above the intersection. otherwise, false.3 }/ F. N6 I- x* b$ x: x( H3 o; z; n
;; false for a non-intersection patches.
: U4 t5 k7 w8 w% ~9 B my-row ;; the row of the intersection counting from the upper left corner of the4 t, v# k, f3 t! z3 Z9 B
;; world. -1 for non-intersection patches.- s- A; B* |/ v9 ^. f5 d/ J3 L
my-column ;; the column of the intersection counting from the upper left corner of the7 s1 C8 X% H7 h r8 w$ x- C
;; world. -1 for non-intersection patches.
2 @& t" V4 {& g- d$ Y my-phase ;; the phase for the intersection. -1 for non-intersection patches.8 T1 z9 S, V ?! a5 j
auto? ;; whether or not this intersection will switch automatically.
3 {) C9 R, M% J* H" n ;; false for non-intersection patches.
2 m K- a2 c S) g* x( C% H]
6 \: T6 D& @* ]8 `* k0 b2 f
4 s5 V9 N1 ^9 J- Z7 \! b$ m! ]! O% K _4 x( P
;;;;;;;;;;;;;;;;;;;;;;
4 k' Q3 W( V9 _! x* J8 H/ `( P;; Setup Procedures ;;
# ~; ?+ B% J8 q) E" o3 ^) \' S" p9 h;;;;;;;;;;;;;;;;;;;;;;
S2 U1 z! G/ _+ X4 l' Y# e6 k6 _: y& \* s; j8 V5 d& f1 h8 W
;; Initialize the display by giving the global and patch variables initial values.
( \0 X. W: C* r# U g4 i# {5 N;; Create num-cars of turtles if there are enough road patches for one turtle to# v# g1 l, o. J$ B
;; be created per road patch. Set up the plots.
+ D9 d$ W R+ x- Y6 [8 y- Lto setup
7 U+ K, W" p9 X6 J( Q% K8 ? ca2 w3 j/ d( k0 z& U
setup-globals
- q& G7 O$ @. d3 |$ Q% } L. @$ M' d) W. ?
;; First we ask the patches to draw themselves and set up a few variables* n5 ?1 B, `0 G
setup-patches# O; D* M* |4 H" z& ^* Y
make-current one-of intersections
( V/ D- e. n% ~" ]5 ]9 |. [ label-current
7 r$ O- @% u6 b! n
* X- y6 ]5 j) }4 U8 I. d3 N4 W set-default-shape turtles "car"
9 l9 U/ K/ V" q. N( g' m* a0 H* m/ C$ w/ P' z* J
if (num-cars > count roads)
, z3 y' N7 o0 T+ c) e [" C$ p2 M7 c2 m; ?' [! H
user-message (word "There are too many cars for the amount of "
' J5 S. C6 t( t5 D; x1 r# f: } "road. Either increase the amount of roads "& D7 X4 u/ o/ |$ b' g
"by increasing the GRID-SIZE-X or "
. u+ v8 P: q5 L d( I "GRID-SIZE-Y sliders, or decrease the "1 I3 V1 g/ l3 V: c7 W$ b" \
"number of cars by lowering the NUMBER slider.\n"* r# ^' J4 ]. e0 D- C: `
"The setup has stopped.")" Q |1 v" C6 T% k8 J9 ]% A% y' V4 L
stop
& C+ |6 I* g2 U0 H; S ]
9 W+ b v U2 | P
# T6 R, j# z/ w( D+ g- }# ` ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
1 {/ h* G, ?9 A7 Z- S$ v crt num-cars4 ]+ _ @# f+ a% {* U. E
[
h0 ^; z) g& G setup-cars$ E8 M7 ~7 |- U5 ~
set-car-color. @% Z) h5 E% _5 ]( x, f0 m: w
record-data8 Y# n0 \3 I" Q- B" T& t8 ~6 u
]6 r" v' Y3 z; f- V9 q( n2 F1 v9 z
5 u, [3 ]& l1 Q" ^2 p# d* s1 z( | ;; give the turtles an initial speed' m5 l7 z% `$ K$ J6 [6 l- N
ask turtles [ set-car-speed ]
- T* n. U0 y G) M
( w2 ~. S- c! j9 t/ ~ reset-ticks+ z5 J J$ u+ n$ ]( T) x
end9 b% b8 s) A A8 W3 }
. c, `0 F" r% @* O
;; Initialize the global variables to appropriate values/ _# L5 M! v/ g: g1 _
to setup-globals
/ g/ A5 f9 \: B9 J# p0 d# z set current-light nobody ;; just for now, since there are no lights yet
" U- i- P' E7 ?+ [. l8 _. H2 w: Z set phase 0
u6 t& g1 P( C& N7 q7 ~ set num-cars-stopped 0
5 e* D1 P) q# [* \* S: v3 [ set grid-x-inc world-width / grid-size-x
3 F: G/ H6 {$ |4 X set grid-y-inc world-height / grid-size-y4 z- a4 y. }% a; k8 A- Z0 e
& `' j8 n# t, {3 m$ \3 i3 E ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
0 O1 F7 }( U+ k set acceleration 0.099
+ G6 |! g o9 e2 `4 s, C" O% {& Zend
9 d1 b/ j+ a0 Q! ~$ j$ j! K" m" Y$ c) G8 `/ D' ^6 K
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
# \9 Y2 W9 p* d$ _/ O$ I, b;; and initialize the traffic lights to one setting0 R* y/ T+ H% n, H# D: K5 K7 D" m l$ @" v& N
to setup-patches
' }6 X% F g4 O/ l) M ;; initialize the patch-owned variables and color the patches to a base-color
" v& |* @( W3 i ask patches
/ E/ A' ?& f+ G, c3 Y9 i [
& X9 }1 g7 L+ U8 ?! \; }7 v set intersection? false \3 f. l7 f8 q3 p1 J
set auto? false
$ O, @% D; N0 J4 [" S$ q* j+ \ set green-light-up? true; |- |/ ]+ }( E, y/ \( s3 ?2 `5 x
set my-row -1
2 i% P: j( ^2 @4 Q7 k set my-column -1
% ^6 _4 p& S# I, } set my-phase -1
$ e' E# Y" E0 t5 G5 Y9 j6 k set pcolor brown + 3 H4 O1 n+ s/ O3 T" i
]) A: V4 \8 F* k1 X' Q$ W* n9 ?! {5 q
1 \$ G- i5 K X4 A
;; initialize the global variables that hold patch agentsets
% E, m. G. ?; l: G) o. l8 b set roads patches with/ l& B! ]5 Z7 q4 D
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; g* P0 V, @! ]- V1 e( s (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' G8 X1 x" ?$ c4 t: H3 d set intersections roads with. i/ F& a0 W+ P
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
% R# A, ^* [- g (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; p3 S5 F3 D0 G5 `& p
! _% v- x5 B0 C ask roads [ set pcolor white ]7 q7 D2 t1 p3 ^! _3 x: Y! q
setup-intersections" \2 j6 D7 b R* G& _1 B8 w
end
$ F Z8 J- {% E# J: r其中定义道路的句子,如下所示,是什么意思啊?
, k8 c/ l* h4 E: V set roads patches with8 @6 c& O+ r' J
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. P) Y% B! ]4 H0 v! [ ^ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! {% t% W1 Z) Q$ y, F1 Q
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? |
|