links-own
[age max-age]                ;; links represent sexual relations, age tells how old a relation is; max age is when it will be broken

turtles-own
[
  adherence          ;; in adherence-based mode, the preferred length of a relationship
  experience         ;; eufemism for how many sexual partners the agent has had, ranges from 0 to... whatever
  t-experience       ;; experience in a time window (to study sampling)
  infected?          ;; if true, the person is infected.  It may be infecting or not infecting.
  infecting?         ;; if true, the person is infecting (hence, infected? must also be true).
  infection-length   ;; how long an agent has been infected
  own-component-size ;; variable for identifying connected components
  explored?          ;; helper variable for the above
]

globals
[ kamu
  component-size          ;; number of turtles explored so far in the current component
  giant-component-size    ;; number of turtles in the giant component
  giant-start-node        ;; node from where we started exploring the giant component 
  virgins-mate            ;; can virgins (ie agents with zero experience) mate with virgins? makes a big difference
]

;;;;;;;;;;;;;;;;;;;;;;;;
;;; Setup Procedures ;;;
;;;;;;;;;;;;;;;;;;;;;;;;

to setup
  clear-all
  ;;ask patches [set pcolor white]
  set-default-shape turtles "circle"
                                             ;; make the initial network of two turtles and an edge
  make-initialnode nobody                    ;; first node, unattached
  make-initialnode turtle 0                  ;; second node, attached to first node
  crt num-nodes - 2 [set color sky + 2]      ;; lonely agents wait in an outside circle...
  layout-circle turtles with [not any? link-neighbors] max-pycor - 1
  set virgins-mate 0 if virgins-can-mate [set virgins-mate 1]
  ask turtles 
      [set infected? false set infecting? false]
  if adherence-matters 
  [ let id 0
  repeat num-nodes - 2 
       [ask turtle id 
         [set adherence (max-adherence - (max-adherence - 1) * id / num-nodes)
       set id id + 1] 
       ]
  ]
  
end

;;;;;;;;;;;;;;;;;;;;;;;
;;; Main Procedures ;;;
;;;;;;;;;;;;;;;;;;;;;;;

to go
  ;; new edge is green, old edges are recolored yellow NOTE> now changed to all is yellow
  ask links [ set color yellow set age age + 1]
  ;; this is just housekeeping
  ask turtles  [ if infected? [ set infection-length infection-length + 1 ]]
  let num-times multiples-in-a-step  ;; this is how many new links are formed in a single time step,
                                     ;; useful to have less lonely agents: total edge number is a function of this number
  repeat num-times                   ;; this is how the above is done...
  [
  make-node find-partner             ;; find first partner & use it as attachment point for connecting (or making in the net) another node
  ]    
  ;; infection part                          
  ask turtles [infect]
  ask turtles [check-symptoms]
  ask turtles [assign-color]
  ;; infection part ends
  ;; so far the real stuff, below this point just link breakup, plotting and more of housekeeping
  tick
  ifelse die-by-age [ask links [if (age > max-age) [die]]]       
                    [ask links [if (random-float 100) < (100 * p) [die]]]  ;; either links have a max age to die, or die by probability p
  layout                                                                   ;; show the net
  layout-circle turtles with [not any? link-neighbors] max-pycor - 1       ;; the lonely agents go to the outer circle
  if show-components                                                       ;; produce and show the histogram of connected network components
  [
    find-all-components
  ]  
  do-plotting                                                              ;; all the clumsy plotting stuff...
end

;; used for creating the first link
to make-initialnode [old-node]
  crt 1
  [ set color lime + 3
    if old-node != nobody
      [ let link-max-age  min sentence adherence [adherence] of old-node   ;; we must compute this before jumping to link context but only needed in adherence mode
        create-link-with old-node 
        [ set color yellow 
          set age -1 * random initial-age-randomization
          ifelse adherence-matters 
                 [ set max-age link-max-age
                   ] 
                 [set max-age age-limit]
          ] ;; was green.. now use same yellow as old links
        set experience 1                ;; if you have sex, you are not a virgin, are you...
        set t-experience 1
        move-to old-node              
        fd 8                            ;; position the newly connected node near its partner
      ]
  ]
end


;; used for creating links between two different nodes where...
to make-node [old-node]                 ;; ...old-node is the "proactive partner" that looks for a new mate via make-node (better called make-contact)
  let new-node nobody                   ;; ...and new-node is her new lover, ie. nobody yet
  ifelse preferential-choice and assortative-mating            
                                        ;; assortative mating means first of all that the new guy will not be necessarily someone w/o a partner.
                                        ;; quite the opposite, agents with greater experience are more likely to be selected as a partner.
                                        ;; (BUT this model is NOT double assortative, where like begets like: small with small, great with great).
                                        ;;
                                        ;; the logic is that first an old-node was selected via a find-partned call in the GO procedure.
                                        ;; in preferential mode, this operation picks an agent with a probability proportional to its experience.
                                        ;;
                                        ;; then, in assortative mode, we dont just randomly pick any lonely agent secondly (anybody can be lonely here,
                                        ;; not just those w/o a partner), but we find one, again, with probability proportional to its experience.
                                        ;;
                                        ;; so, highly probable events are hubs w/ hubs, medium p events are hubs w/ virgins, less probable are virgins w/ virgins
                  [set new-node find-lonely]
                  [set new-node one-of turtles with [not any? link-neighbors]]   ;; the basic case: new-node is a random pick from those w/o a partner
  if new-node = old-node [stop]         ;; self-sex is not real sex... so no link is formed (can see the effect on the plot sometimes...)
  ask new-node                          ;; so we have a new guy...
  [
    if old-node != nobody               ;; ... and unless the old guy dies or otherwise inexists (it happened...), a link is formed, tadamm.
        [ let link-max-age  min sentence adherence [adherence] of old-node   ;; we must compute this before jumping to link context but only needed in adherence mode
        create-link-with old-node 
        [ set color yellow 
          set age -1 * random initial-age-randomization
          ifelse adherence-matters 
                 [ set max-age link-max-age
                   ] 
                 [set max-age age-limit]
          ] ;; was green.. now use same yellow as old links
          ]
        ;move-to old-node                                      ;; uncomment this experimentally and then decide
        fd -1                                                  ;; a drawing trick, dont let newly connected nodes collapse, no matter what
        set experience experience + 1                          ;; experience grows for both nodes of a new link
        set t-experience t-experience + 1
        ask old-node [
          set experience experience + 1 
          set t-experience t-experience + 1]
  ]
end


to-report find-partner                  ;; dont let the name trick you, this finds a FIRST guy, ie. the proactive one, looking for a mate
  let partner nobody
  if serial-monogamy                    ;; serial monogamy = only agents w/o partner can mate. implies virgins-can-mate or nothing happens at startup
           [set partner one-of turtles with [count link-neighbors = 0] report partner]
  ifelse preferential-choice            ;; there are two modes here, preferential, which uses code from a lottery w/ multiple tickets
                                        ;; and random uniform, below the preferential, which picks any one guy and finito.
                                        ;;
  [let total random-float sum [experience + virgins-mate] of turtles   ;; a bit of a trick here: if virgins can mate, we shift experience by 1 so they have one ticket.
  ask turtles
  [
    let nc experience + virgins-mate
    ;; if there's no winner yet...
    if partner = nobody
    [
      ifelse nc > total
        [ set partner self ]
        [ set total total - nc ]
    ]
  ]
  report partner
  ]
                                         ;; below this line, the non-preferential mode, ie. random uniform selection of partner
  [
  ifelse virgins-can-mate [set partner one-of turtles][set partner one-of turtles with [experience > 0]]  ;; select any agent, or anyone with experience
  report partner
  ]
end

to-report find-lonely                    ;; misleading name again, lonely is the proactive agent that seeks a partner, we call this function in assortative mode
                                         ;; which means more experienced, and probably linked, agents have a higher chance to be selected
  let total random-float sum [experience + 1] of turtles   ;; here the plus one is a must, or nothing ever happens at startup, where everybody has zero
  let partner nobody
  ask turtles 
  [
    let nc (experience + 1)
    ;; if there's no winner yet...
    if partner = nobody
    [
      ifelse nc > total
        [ set partner self ]
        [ set total total - nc ]
    ]
  ]
  report partner
end

;;;;;;;;;;;;;;;;;;;;
;; Infection part ;;
;;;;;;;;;;;;;;;;;;;;

to random-infection  ;; you may get infected only if you are not a virgin and not currently inactive
   let nums (count turtles with [count link-neighbors > 0]) * actives-to-infect / 100
   ask n-of nums turtles with [count link-neighbors > 0] [set infected? true]
   ask turtles [
   if infected? [ ifelse (experience = 0) or (count link-neighbors = 0) [ set infected? false set infecting? false]
        [ set infection-length random-float stop-infecting set infecting? true set color red]]
   ]
end

to experienced-infection  ;; as random infection, except that we infect agents with most experience
   let nums (count turtles with [count link-neighbors > 0]) * actives-to-infect / 100
   ask max-n-of nums turtles [experience] [set infected? true]
   ask turtles [   
   if infected? [ ifelse (experience = 0) or (count link-neighbors = 0) [ set infected? false set infecting? false]
        [ set infection-length random-float stop-infecting set infecting? true set color red]]
   ]
end

to infect  ;; turtle procedure
  if (count link-neighbors > 0) and infected? and infecting?
        [ ask link-neighbors
            [ if random-float 100 < p-of-infection-per-step
               [ set infected? true set infecting? true ] ] ]
end

to check-symptoms
  if (infection-length > stop-infecting) [set infecting? false]
end

to-report %infected
  ifelse any? turtles
    [ report (count turtles with [infected?] / count turtles) * 100 ]
    [ report 0 ]
end

to-report num-infected
  report (count turtles with [infected?])
end

to-report num-infecting
  report (count turtles with [infecting?])
end

to-report %infecting
  ifelse any? turtles
    [ report (count turtles with [infecting?] / count turtles) * 100 ]
    [ report 0 ]
end

to-report num-active
  report (count turtles with [count link-neighbors > 0])
end


to-report %infected-active
  ifelse any? turtles
    [ report (count turtles with [infected? and count link-neighbors > 0] / count turtles with [count link-neighbors > 0]) * 100 ]
    [ report 0 ]
end

;; to find all the connected components in the network, their sizes and starting turtles
to find-all-components
  ask turtles [ set explored? false set own-component-size 0]
  ;; keep exploring till all turtles get explored
  loop
  [
    ;; pick a node that has not yet been explored
    let starting-agent one-of turtles with [ not explored? ]
    if starting-agent = nobody [ stop ]
    ;; reset the number of turtles found to 0
    ;; this variable is updated each time we explore an
    ;; unexplored node.
    set component-size 0
    ;; at this stage, we recolor everything to light gray
    ask starting-agent [ explore ]
    ask starting-agent [ set own-component-size component-size]
    ;; the explore procedure updates the component-size variable.
    ;; so check, have we found a new giant component?
    if component-size > giant-component-size
    [
      set giant-component-size component-size
      set giant-start-node starting-agent
    ]
  ]
end

to assign-color  ;; turtle procedure
  ifelse (experience = 0) [set color sky + 2 set infected? false set infecting? false]
    [ifelse not infected?
    [ set color lime + 3 ]
    [ ifelse infecting?
      [ set color red ]
      [ set color gray ] ]]
end


;; Finds all turtles reachable from this node (and recolors them)
to explore  ;; node procedure
  if explored? [ stop ]
  set explored? true
  set component-size component-size + 1
  ;; color the node
  ;set color new-color
  ask link-neighbors [ explore ]
end


;;;;;;;;;;;;;;;;
;;; Plotting ;;;
;;;;;;;;;;;;;;;;

to do-plotting ;; plotting procedure
  set-current-plot "Degree Distribution"
  let max-experience max [experience] of turtles
  set-plot-x-range 1 (max-experience + 1)
  set-current-plot-pen "cumulative-degree"
  plot-pen-reset
  histogram [experience] of turtles
  set-current-plot-pen "degree"
  plot-pen-reset  ;; erase what we plotted before
  let max-degree max [count link-neighbors] of turtles
;  set-plot-x-range 1 (max-degree + 1)  ;; + 1 to make room for the width of the last bar
  histogram [count link-neighbors] of turtles
  ;; for the next plot, the axes are logarithmic, so we can't
  ;; use "histogram-from"; we have to plot the points
  ;; ourselves one at a time
  set-current-plot "Degree Distribution (log-log)"
  set-current-plot-pen "degree"
  plot-pen-reset  ;; erase what we plotted before
  ;; the way we create the network there is never a zero degree node,
  ;; so start plotting at degree one
  let degree 1
  while [degree <= max-degree]
  [
    let matches turtles with [count link-neighbors = degree]
    if any? matches
      [ plotxy log degree 10
               log (count matches) 10 ]
    set degree degree + 1
  ]
  set-current-plot-pen "degree-dot"
  plot-pen-reset  ;; erase what we plotted before
  ;; the way we create the network there is never a zero degree node,
  ;; so start plotting at degree one
  set degree 1
  while [degree <= max-degree]
  [
    let matches turtles with [count link-neighbors = degree]
    if any? matches
      [ plotxy log degree 10
               log (count matches) 10 ]
    set degree degree + 1
  ]
  set-current-plot-pen "cumulative-degree"
  plot-pen-reset  ;; erase what we plotted before
  ;; the way we create the network there is never a zero degree node,
  ;; so start plotting at degree one
  let cumulative-degree 1
  while [cumulative-degree <= max-experience]
  [
    let cumulative-matches turtles with [experience = cumulative-degree]
    if any? cumulative-matches
      [ plotxy log cumulative-degree 10
               log (count cumulative-matches) 10 ]
    set cumulative-degree cumulative-degree + 1
  ]
  set-current-plot-pen "timed-degree"
  plot-pen-reset
  let max-t-experience max [t-experience] of turtles
  set cumulative-degree 1
  while [cumulative-degree <= max-t-experience]
  [
    let cumulative-matches turtles with [t-experience = cumulative-degree]
    if any? cumulative-matches
      [ 
        plotxy log cumulative-degree 10
               log (count cumulative-matches) 10 ]
    set cumulative-degree cumulative-degree + 1
  ]
  set-current-plot-pen "cumulative-degree-dot"
  plot-pen-reset  ;; erase what we plotted before
  ;; the way we create the network there is never a zero degree node,
  ;; so start plotting at degree one
  set cumulative-degree 1
  while [cumulative-degree <= max-experience]
  [
    let cumulative-matches turtles with [experience = cumulative-degree]
    if any? cumulative-matches
      [ 
        plotxy log cumulative-degree 10
               log (count cumulative-matches) 10 ]
    set cumulative-degree cumulative-degree + 1
  ]
    let cumulative-links sum [experience] of turtles
  ;;
  set-current-plot "Density"
  set-current-plot-pen "current"
  plot count links / (num-nodes * num-nodes)
  set-current-plot-pen "summative"
  plot cumulative-links / (num-nodes * num-nodes * 2)    ;; two nodes is one link, divide by 2
  ;;
  set-current-plot "Populations"
  set-current-plot-pen "HIV-"
  plot count turtles with [not infected?] ;and count link-neighbors > 0] 
  set-current-plot-pen "HIVall"
  plot count turtles with [infected?]
  set-current-plot-pen "HIV+"
  plot count turtles with [infecting?]
  ;;
  set-current-plot "Experience"
  histogram [experience] of turtles
  set-current-plot "Link-age"
  set kamu [age] of links
  histogram kamu
  ;;
  if show-components 
  [
    set-current-plot "Component Distribution"
    clear-plot
    histogram [own-component-size] of turtles with [own-component-size > 0]
  ] 
end

to-report num-components 
  report count turtles with [own-component-size > 1]
end

;;;;;;;;;;;;;;
;;; Layout ;;;
;;;;;;;;;;;;;;

;; resize-nodes, change back and forth from size based on degree to a size of 1
to resize-nodes
  ifelse all? turtles [size <= 1]
  [
    ;; a node is a circle with diameter determined by
    ;; the SIZE variable; using SQRT makes the circle's
    ;; area proportional to its degree
    ask turtles [ set size sqrt experience ]
  ]
  [
    ask turtles [ set size 1 ]
  ]
end

to layout
  ;; the number 3 here is arbitrary; more repetitions slows down the
  ;; model, but too few gives poor layouts
  repeat 3 [
    ;; the more turtles we have to fit into the same amount of space,
    ;; the smaller the inputs to layout-spring we'll need to use
    let factor sqrt count turtles
    ;; numbers here are arbitrarily chosen for pleasing appearance
    layout-spring turtles with [any? link-neighbors] links (1 / factor) (7 / factor) (1 / factor)
    display  ;; for smooth animation
  ]
  ;; don't bump the edges of the world
  let x-offset max [xcor] of turtles + min [xcor] of turtles
  let y-offset max [ycor] of turtles + min [ycor] of turtles
  ;; big jumps look funny, so only adjust a little each time
  set x-offset limit-magnitude x-offset 0.1
  set y-offset limit-magnitude y-offset 0.1
  ask turtles [ setxy (xcor - x-offset / 2) (ycor - y-offset / 2) ]
end

to-report limit-magnitude [number limit]
  if number > limit [ report limit ]
  if number < (- limit) [ report (- limit) ]
  report number
end


; Copyight 2010 by George Kampis. Using code by Uri Wilensky and others as execution modules.




@#$#@#$#@
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Degree Distribution (log-log)
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Degree Distribution
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NIL

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go
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BUTTON
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go-once
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OBSERVER
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BUTTON
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redo layout
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OBSERVER
NIL
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BUTTON
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resize nodes
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Component Distribution
Size
Number
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age = age of relationship
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SLIDER
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TEXTBOX
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PLOT
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Populations
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0.0
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BUTTON
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TEXTBOX
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bias: age of link when born
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PLOT
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Link-age
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PLOT
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BUTTON
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Reset sampling window
ask turtles [set t-experience 0]
NIL
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OBSERVER
NIL
NIL
NIL
NIL

TEXTBOX
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plots blue
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MONITOR
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NIL
num-components
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@#$#@#$#@
WHAT IS IT?
-----------
A sexual contact and HIV spreading network model.


HOW IT WORKS
------------


HOW TO USE IT
-------------


THINGS TO NOTICE
----------------


THINGS TO TRY
-------------



KNOWN ISSUES
-------------------
Experience handling (adding plus one to give nonzero chance for virgins to mate) changes proportions slightly in virgin mode. Perhaps add +1 experience at setup but never more is better.



COPYRIGHT NOTICE
----------------
Copyright 2010 George Kampis using code excerpts from Uri Wilensky. All rights reserved.

Permission to use, modify or redistribute this model is hereby granted, provided that both of the following requirements are followed:
a) this copyright notice is included.
b) this model will not be redistributed for profit without permission from Uri Wilensky. Contact Uri Wilensky for appropriate licenses for redistribution for profit.

@#$#@#$#@
default
true
0
Polygon -7500403 true true 150 5 40 250 150 205 260 250

airplane
true
0
Polygon -7500403 true true 150 0 135 15 120 60 120 105 15 165 15 195 120 180 135 240 105 270 120 285 150 270 180 285 210 270 165 240 180 180 285 195 285 165 180 105 180 60 165 15

arrow
true
0
Polygon -7500403 true true 150 0 0 150 105 150 105 293 195 293 195 150 300 150

box
false
0
Polygon -7500403 true true 150 285 285 225 285 75 150 135
Polygon -7500403 true true 150 135 15 75 150 15 285 75
Polygon -7500403 true true 15 75 15 225 150 285 150 135
Line -16777216 false 150 285 150 135
Line -16777216 false 150 135 15 75
Line -16777216 false 150 135 285 75

bug
true
0
Circle -7500403 true true 96 182 108
Circle -7500403 true true 110 127 80
Circle -7500403 true true 110 75 80
Line -7500403 true 150 100 80 30
Line -7500403 true 150 100 220 30

butterfly
true
0
Polygon -7500403 true true 150 165 209 199 225 225 225 255 195 270 165 255 150 240
Polygon -7500403 true true 150 165 89 198 75 225 75 255 105 270 135 255 150 240
Polygon -7500403 true true 139 148 100 105 55 90 25 90 10 105 10 135 25 180 40 195 85 194 139 163
Polygon -7500403 true true 162 150 200 105 245 90 275 90 290 105 290 135 275 180 260 195 215 195 162 165
Polygon -16777216 true false 150 255 135 225 120 150 135 120 150 105 165 120 180 150 165 225
Circle -16777216 true false 135 90 30
Line -16777216 false 150 105 195 60
Line -16777216 false 150 105 105 60

car
false
0
Polygon -7500403 true true 300 180 279 164 261 144 240 135 226 132 213 106 203 84 185 63 159 50 135 50 75 60 0 150 0 165 0 225 300 225 300 180
Circle -16777216 true false 180 180 90
Circle -16777216 true false 30 180 90
Polygon -16777216 true false 162 80 132 78 134 135 209 135 194 105 189 96 180 89
Circle -7500403 true true 47 195 58
Circle -7500403 true true 195 195 58

circle
false
0
Circle -7500403 true true 0 0 300

circle 2
false
0
Circle -7500403 true true 0 0 300
Circle -16777216 true false 30 30 240

cow
false
0
Polygon -7500403 true true 200 193 197 249 179 249 177 196 166 187 140 189 93 191 78 179 72 211 49 209 48 181 37 149 25 120 25 89 45 72 103 84 179 75 198 76 252 64 272 81 293 103 285 121 255 121 242 118 224 167
Polygon -7500403 true true 73 210 86 251 62 249 48 208
Polygon -7500403 true true 25 114 16 195 9 204 23 213 25 200 39 123

cylinder
false
0
Circle -7500403 true true 0 0 300

dot
false
0
Circle -7500403 true true 90 90 120

face happy
false
0
Circle -7500403 true true 8 8 285
Circle -16777216 true false 60 75 60
Circle -16777216 true false 180 75 60
Polygon -16777216 true false 150 255 90 239 62 213 47 191 67 179 90 203 109 218 150 225 192 218 210 203 227 181 251 194 236 217 212 240

face neutral
false
0
Circle -7500403 true true 8 7 285
Circle -16777216 true false 60 75 60
Circle -16777216 true false 180 75 60
Rectangle -16777216 true false 60 195 240 225

face sad
false
0
Circle -7500403 true true 8 8 285
Circle -16777216 true false 60 75 60
Circle -16777216 true false 180 75 60
Polygon -16777216 true false 150 168 90 184 62 210 47 232 67 244 90 220 109 205 150 198 192 205 210 220 227 242 251 229 236 206 212 183

fish
false
0
Polygon -1 true false 44 131 21 87 15 86 0 120 15 150 0 180 13 214 20 212 45 166
Polygon -1 true false 135 195 119 235 95 218 76 210 46 204 60 165
Polygon -1 true false 75 45 83 77 71 103 86 114 166 78 135 60
Polygon -7500403 true true 30 136 151 77 226 81 280 119 292 146 292 160 287 170 270 195 195 210 151 212 30 166
Circle -16777216 true false 215 106 30

flag
false
0
Rectangle -7500403 true true 60 15 75 300
Polygon -7500403 true true 90 150 270 90 90 30
Line -7500403 true 75 135 90 135
Line -7500403 true 75 45 90 45

flower
false
0
Polygon -10899396 true false 135 120 165 165 180 210 180 240 150 300 165 300 195 240 195 195 165 135
Circle -7500403 true true 85 132 38
Circle -7500403 true true 130 147 38
Circle -7500403 true true 192 85 38
Circle -7500403 true true 85 40 38
Circle -7500403 true true 177 40 38
Circle -7500403 true true 177 132 38
Circle -7500403 true true 70 85 38
Circle -7500403 true true 130 25 38
Circle -7500403 true true 96 51 108
Circle -16777216 true false 113 68 74
Polygon -10899396 true false 189 233 219 188 249 173 279 188 234 218
Polygon -10899396 true false 180 255 150 210 105 210 75 240 135 240

house
false
0
Rectangle -7500403 true true 45 120 255 285
Rectangle -16777216 true false 120 210 180 285
Polygon -7500403 true true 15 120 150 15 285 120
Line -16777216 false 30 120 270 120

leaf
false
0
Polygon -7500403 true true 150 210 135 195 120 210 60 210 30 195 60 180 60 165 15 135 30 120 15 105 40 104 45 90 60 90 90 105 105 120 120 120 105 60 120 60 135 30 150 15 165 30 180 60 195 60 180 120 195 120 210 105 240 90 255 90 263 104 285 105 270 120 285 135 240 165 240 180 270 195 240 210 180 210 165 195
Polygon -7500403 true true 135 195 135 240 120 255 105 255 105 285 135 285 165 240 165 195

line
true
0
Line -7500403 true 150 0 150 300

line half
true
0
Line -7500403 true 150 0 150 150

pentagon
false
0
Polygon -7500403 true true 150 15 15 120 60 285 240 285 285 120

person
false
0
Circle -7500403 true true 110 5 80
Polygon -7500403 true true 105 90 120 195 90 285 105 300 135 300 150 225 165 300 195 300 210 285 180 195 195 90
Rectangle -7500403 true true 127 79 172 94
Polygon -7500403 true true 195 90 240 150 225 180 165 105
Polygon -7500403 true true 105 90 60 150 75 180 135 105

plant
false
0
Rectangle -7500403 true true 135 90 165 300
Polygon -7500403 true true 135 255 90 210 45 195 75 255 135 285
Polygon -7500403 true true 165 255 210 210 255 195 225 255 165 285
Polygon -7500403 true true 135 180 90 135 45 120 75 180 135 210
Polygon -7500403 true true 165 180 165 210 225 180 255 120 210 135
Polygon -7500403 true true 135 105 90 60 45 45 75 105 135 135
Polygon -7500403 true true 165 105 165 135 225 105 255 45 210 60
Polygon -7500403 true true 135 90 120 45 150 15 180 45 165 90

square
false
0
Rectangle -7500403 true true 30 30 270 270

square 2
false
0
Rectangle -7500403 true true 30 30 270 270
Rectangle -16777216 true false 60 60 240 240

star
false
0
Polygon -7500403 true true 151 1 185 108 298 108 207 175 242 282 151 216 59 282 94 175 3 108 116 108

target
false
0
Circle -7500403 true true 0 0 300
Circle -16777216 true false 30 30 240
Circle -7500403 true true 60 60 180
Circle -16777216 true false 90 90 120
Circle -7500403 true true 120 120 60

tree
false
0
Circle -7500403 true true 118 3 94
Rectangle -6459832 true false 120 195 180 300
Circle -7500403 true true 65 21 108
Circle -7500403 true true 116 41 127
Circle -7500403 true true 45 90 120
Circle -7500403 true true 104 74 152

triangle
false
0
Polygon -7500403 true true 150 30 15 255 285 255

triangle 2
false
0
Polygon -7500403 true true 150 30 15 255 285 255
Polygon -16777216 true false 151 99 225 223 75 224

truck
false
0
Rectangle -7500403 true true 4 45 195 187
Polygon -7500403 true true 296 193 296 150 259 134 244 104 208 104 207 194
Rectangle -1 true false 195 60 195 105
Polygon -16777216 true false 238 112 252 141 219 141 218 112
Circle -16777216 true false 234 174 42
Rectangle -7500403 true true 181 185 214 194
Circle -16777216 true false 144 174 42
Circle -16777216 true false 24 174 42
Circle -7500403 false true 24 174 42
Circle -7500403 false true 144 174 42
Circle -7500403 false true 234 174 42

turtle
true
0
Polygon -10899396 true false 215 204 240 233 246 254 228 266 215 252 193 210
Polygon -10899396 true false 195 90 225 75 245 75 260 89 269 108 261 124 240 105 225 105 210 105
Polygon -10899396 true false 105 90 75 75 55 75 40 89 31 108 39 124 60 105 75 105 90 105
Polygon -10899396 true false 132 85 134 64 107 51 108 17 150 2 192 18 192 52 169 65 172 87
Polygon -10899396 true false 85 204 60 233 54 254 72 266 85 252 107 210
Polygon -7500403 true true 119 75 179 75 209 101 224 135 220 225 175 261 128 261 81 224 74 135 88 99

wheel
false
0
Circle -7500403 true true 3 3 294
Circle -16777216 true false 30 30 240
Line -7500403 true 150 285 150 15
Line -7500403 true 15 150 285 150
Circle -7500403 true true 120 120 60
Line -7500403 true 216 40 79 269
Line -7500403 true 40 84 269 221
Line -7500403 true 40 216 269 79
Line -7500403 true 84 40 221 269

x
false
0
Polygon -7500403 true true 270 75 225 30 30 225 75 270
Polygon -7500403 true true 30 75 75 30 270 225 225 270

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NetLogo 4.1
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set layout? false
set plot? false
setup repeat 300 [ go ]
repeat 100 [ layout ]
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default
0.0
-0.2 0 0.0 1.0
0.0 1 1.0 0.0
0.2 0 0.0 1.0
link direction
true
0
Line -7500403 true 150 150 90 180
Line -7500403 true 150 150 210 180

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0
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