diffusion2

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daniel kim (Author)

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Click to Run Model

;if pborder? []
globals [xsetup ysetup hnum patchmark]
breed [hydrogens hydrogen]  ;;hydrogen
breed [startpts startpt]
breed [borders border]
;breed [droppers dropper]

to setup
  
  clear-all
  set xsetup -10
  set ysetup -10
  set hnum 0
  set patchmark 800
  
  ask patches 
  [
    if (pycor > min-pycor) and (pycor < max-pycor) and (pxcor > min-pxcor) and (pxcor < max-pxcor)
    [set pcolor 98]
  ]
  
  set-default-shape hydrogens "circle"
  create-hydrogens 400 
  [
    set color green
    set size 0.5
    set label-color blue - 2
    setxy min-pxcor min-pycor
  ]  
  
  set-default-shape startpts "circle"
  create-startpts 400 
  [
    set color gray
    set size 0.25
    set label-color blue - 2
    setxy min-pxcor min-pycor
  ]
  
  set-default-shape borders "border"
  create-borders (count patches)
  [
    set color 95
    face one-of neighbors4
    setxy min-pxcor min-pycor
  ]
  
  ;set the first one
  ask hydrogen 0 [setxy -10 -10]
  ask startpt 400 [setxy -10 -10]

  loop
  [

    if not any? hydrogens with [(pxcor =  min-pxcor) and (pycor =  min-pycor)]
    [ stop ]
 

    ask hydrogen hnum [setxy xsetup ysetup]
    
    ask startpt (hnum + 400) 
    [ setxy xsetup ysetup
      ;create-link-with hydrogen hnum
      ]
    

    
    set xsetup xsetup + 1
    if (xsetup = 10)
    [ set xsetup -10
      set ysetup ysetup + 1 ]
    set hnum hnum + 1
  ]
  
  set xsetup -19
  set ysetup -19
  
  ask border (patchmark)
  [ setxy xsetup ysetup ]
  
  loop
  [   
    if not any? borders with [(pxcor =  min-pxcor) and (pycor =  min-pycor)]
    [ stop ]
    
    set xsetup xsetup + 1
    
    ask border patchmark
    [ 
      setxy xsetup ysetup 
      if (xsetup = 20)
      [ set xsetup -20
        set ysetup ysetup + 1 ]
      set patchmark patchmark + 1]]
end 

to go
  if not any? hydrogens [ stop ]

  ;center hydrogens
  ask hydrogens
  [ setxy pxcor pycor ]
  
  ask hydrogens
  [ ;if the hydrogen is within the yellow border
    ifelse ((xcor < max-pxcor) and (xcor > min-pxcor) and (ycor < max-pycor) and (ycor > min-pycor)) 
    
    [ ;if theres no place to jump, just jiggle
      ifelse (count (neighbors4 with [not any? hydrogens-here]) = 0)
      [ ;rt (random 4) * 90 
        ;fd (random 100) / 200 
        ]
      ;if there are empty places to jump
      [ ifelse (random 100 < jumpChance)
        [ face one-of neighbors4 with [not any? hydrogens-here]
          fd 1 ]
        [ ;rt (random 4) * 90 ; else jiggle
          ;fd (random 100) / 200 
          ]]]
    [ ask patch-here 
      [ set pcolor pcolor + 1]
      die ]
    
  ]
  
  set-current-plot "hCount"
  set-current-plot-pen "hydrogens"
  plot count hydrogens

  
  
  tick
end

There is only one version of this model, created over 14 years ago by daniel kim.

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