|
|
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。
# t* k3 \' G; T7 A2 E: rnetlogo自带的social science--traffic grid这一例子当中,& c e! w; F+ H/ w8 L$ Y3 c" t
globals4 \, V4 g% |' Z
[6 B- E% a; u8 C2 x- h
grid-x-inc ;; the amount of patches in between two roads in the x direction
" z7 V8 |9 h* S1 U9 e- h7 Y grid-y-inc ;; the amount of patches in between two roads in the y direction
& h Y- S, a+ C' m S acceleration ;; the constant that controls how much a car speeds up or slows down by if" w% u5 `) T- R+ b+ ]
;; it is to accelerate or decelerate
3 \; K& O$ l. P1 F phase ;; keeps track of the phase
1 J% Q3 \7 \2 ?2 @ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
+ S: z: H6 L7 d ]# a current-light ;; the currently selected light
# z! K: N" g5 T9 H$ A, Z8 |! {3 b5 ~ S! [! L8 U$ f
;; patch agentsets5 @7 J& ~% h) I# E9 B* Y3 u
intersections ;; agentset containing the patches that are intersections
( _+ l. f9 r9 B5 X roads ;; agentset containing the patches that are roads: d. B0 a. x: f" Q
]
9 R" {/ F P# J% \2 U& k; H3 D2 T+ H, Z
turtles-own
1 `7 y8 z2 n8 Q[
4 A, o2 `# n2 | speed ;; the speed of the turtle
0 E" @2 Z T0 \" u0 o8 _3 F up-car? ;; true if the turtle moves downwards and false if it moves to the right, T3 R& j2 Q- x% `; }& X, o: ~
wait-time ;; the amount of time since the last time a turtle has moved
! q( {2 z( t4 |) x6 d' i3 e] J8 G" q! N2 s9 D+ J% l- K0 Z
. |% I V( f% x' ]
patches-own: _# A: C3 p. T/ c5 Q/ [8 Q% k0 o
[) c& z/ Y7 @9 \9 J& m# D
intersection? ;; true if the patch is at the intersection of two roads
: @0 e& Q* Q, g1 j5 n/ x1 W6 z green-light-up? ;; true if the green light is above the intersection. otherwise, false.
( y2 Y9 y: y8 f4 K. ^# ~" l. \$ H ;; false for a non-intersection patches.& Z- x2 Y- N% d) ?% L% b$ i( D; m
my-row ;; the row of the intersection counting from the upper left corner of the
% B, r* B& ?( j0 @# ]3 ^ ;; world. -1 for non-intersection patches.
1 z, |, _+ J- j my-column ;; the column of the intersection counting from the upper left corner of the
9 y: L4 p0 R- j ;; world. -1 for non-intersection patches.) ~; s8 A y" j% `5 U, i
my-phase ;; the phase for the intersection. -1 for non-intersection patches.9 y f/ e/ I( C- j$ o
auto? ;; whether or not this intersection will switch automatically.
) s+ o9 q% E7 B& Z* \ ;; false for non-intersection patches.
$ E2 t' S$ w3 @% y]
; i0 ?! d0 [0 x2 r3 V% ^: Y, s: z) l' q
# |. l- `0 B9 [, x
;;;;;;;;;;;;;;;;;;;;;;
8 E) ?) C3 u0 c2 a. g+ v& H;; Setup Procedures ;;
/ y3 m* Q! {9 s- W( }% M;;;;;;;;;;;;;;;;;;;;;;
0 J+ o& b4 V: W; }6 W- h S
/ L0 }7 I- l( z' p- X( y;; Initialize the display by giving the global and patch variables initial values.
, I/ p6 N: X- P* V) }5 V( p;; Create num-cars of turtles if there are enough road patches for one turtle to- e- |2 T% y8 I# z% @! g# j2 \+ |
;; be created per road patch. Set up the plots.# y/ b5 e9 a: z5 k
to setup& B, D, D ]1 b6 }
ca' d2 K$ B0 r* }* x9 H$ F7 R5 w
setup-globals. b/ a1 a$ T6 l1 @; K$ ~( i
* w7 k" X2 X2 c- C' h ;; First we ask the patches to draw themselves and set up a few variables
. w6 p/ q6 l- O- r+ l* t# ?, ? setup-patches; i2 H* y! }( S; W
make-current one-of intersections; W1 W3 T' l0 d. D6 x$ I
label-current
+ [# ~; x# `* K* x @' J7 W" U0 _2 s4 y7 T
set-default-shape turtles "car"
2 @/ U7 ^& Z4 |6 V8 @7 N) N/ b! z) F7 T: S
if (num-cars > count roads)
- b0 S. t. s5 O, T6 J" i9 ~ [9 j- ?- W8 ]& n% z% A0 y, @9 ^3 h% r
user-message (word "There are too many cars for the amount of "( Y% `) J8 a( l" H( U
"road. Either increase the amount of roads "
2 j. r, S4 s7 E) h# ~! ]) D6 m% t; { "by increasing the GRID-SIZE-X or "! Z. Q* z' J% r7 ^. n7 R" O
"GRID-SIZE-Y sliders, or decrease the "
" M0 b$ j$ T# A' E9 U "number of cars by lowering the NUMBER slider.\n"
% M! D1 h" J1 J) b9 ? "The setup has stopped.")
g6 p6 _. n& J8 r stop
0 {$ L4 F5 j; A8 M ]
0 b) [5 I2 ^* d' a S! T5 g
" I& z r- O5 u3 Z1 b ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 l6 V. ?' {+ Z0 X. M x* V7 D
crt num-cars# N1 l' d! H7 v: z; z/ U
[
, n( l, r: t; S. Z) H" n$ J" Q* L setup-cars
* ?8 S w) O# ?% b! f set-car-color5 f m! j" E3 u, ^
record-data6 `8 B* Z1 `1 h7 I3 U2 \9 ^$ c5 L2 @
]" d8 `/ O; E6 g3 q2 Q
4 h5 }& a% z/ F% X [/ N6 p
;; give the turtles an initial speed
/ E4 r% z/ G9 k; [( V ask turtles [ set-car-speed ]
/ {4 r8 h2 @7 J& J! Y( m5 U8 ^7 E! n; t. z7 o% n, H7 x
reset-ticks
# y2 O* r$ ]1 |) e' L+ lend
, |( U4 g4 H+ b3 Q% T! U ^ @' z" u4 J4 `# P* {- O9 J
;; Initialize the global variables to appropriate values' p' Q2 t$ N* l; R
to setup-globals
$ \ @, Q6 v/ t4 M( T+ r set current-light nobody ;; just for now, since there are no lights yet: X$ F+ e! l6 J2 l) Q8 c
set phase 0
9 y+ P5 c1 G5 T2 Z+ } set num-cars-stopped 0& v2 h2 A% L |3 m* Y; s
set grid-x-inc world-width / grid-size-x9 x* j6 d+ o. S- M0 A* O6 f
set grid-y-inc world-height / grid-size-y
1 H* v! @' W0 J& Q& w7 k9 ^8 Z7 \2 B8 W
;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary: i6 h: D8 e/ B* _' _
set acceleration 0.099 s$ ^/ u- W4 m4 }
end7 c+ ~* ]& V4 C! @3 U5 J
) l7 n8 j+ @6 n& O, ~7 Y
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
+ c6 X/ Q8 O' z% J1 T' g;; and initialize the traffic lights to one setting
: E' i; k# h( g& }+ O8 vto setup-patches
+ ]0 G% I& W6 G8 s* M ?. Z Q" I ;; initialize the patch-owned variables and color the patches to a base-color
! F" H% _6 k4 w4 z( d ask patches, O8 k9 d. q$ ?% n7 A
[
# Y# N6 `5 F8 i v" m set intersection? false
; Y j* L- ~4 |+ G( @ set auto? false
A0 L) }% |( Q8 H$ |& i1 H set green-light-up? true
' o3 e, [- L* ~3 i: E/ _% o set my-row -1" O; Y$ y% f& m: h3 ]7 O8 J
set my-column -1- H( i8 s- r, m% u4 t
set my-phase -1
7 D" J- Y3 m! K/ R/ ^# a9 C8 P: x3 N set pcolor brown + 3
/ u0 [% c# v' S, `' `: j& H$ [ ]7 v7 t O6 b2 J% S
9 H. I7 p, T6 _" E1 b ;; initialize the global variables that hold patch agentsets/ k4 l& u# E; @# H& R6 f# H! l9 R
set roads patches with& _* \( ?: V, t, t! i% \, H/ {
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. k+ b- E* K: G6 d) P (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. V3 \) F8 K# q; ^/ U9 F' L
set intersections roads with( f$ K% g4 S& }3 x7 D
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
1 ~5 p/ T9 o2 \+ `( J% u (floor((pycor + max-pycor) mod grid-y-inc) = 0)], ^; _& h# {+ M$ ~# S: R' ^
5 e7 {+ D1 T k% Q& u5 v e, C. b ask roads [ set pcolor white ]# a; y4 j1 Z9 e! a$ w
setup-intersections
* @7 W% W0 M) p# uend
" A% D( L( A: {* q其中定义道路的句子,如下所示,是什么意思啊?
# b( R5 [" u' z7 G3 @1 W set roads patches with
5 z' h2 s9 Z! R ?$ J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 R9 M% N$ ] y" U# m; r6 T V- Z (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: u/ i T4 e) e, w& k
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? |
|