MIHS-18 P2 Max Fischel
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globals [ max-person ] breed [ person a-person ] breed [ wolves wolf ] turtles-own [ energy ] patches-own [ countdown ] to setup clear-all ifelse netlogo-web? [set max-person 10000] [set max-person 30000] ifelse model-version = "sheep-wolves-grass" [ ask patches [ set pcolor one-of [ green brown ] ifelse pcolor = green [ set countdown grass-regrowth-time ] [ set countdown random grass-regrowth-time ] ] ] [ ask patches [ set pcolor blue ] ] create-person initial-number-sheep ; [ set shape "person" set color yellow set size 1.65 ; easier to see set label-color blue - 2 set energy random (2 * person-gain-from-food) setxy random-xcor random-ycor ] create-wolves initial-number-wolves [ set shape "wolf" set color brown set size 1.88 set energy random (2 * wolf-gain-from-food) setxy random-xcor random-ycor ] display-labels reset-ticks end to go if not any? turtles [ stop ] if not any? wolves and count person > max-person [ user-message "The people have taken over the earth" stop ] ask person [ move if model-version = "sheep-wolves-grass" [ set energy energy - 1 eat-grass death ] reproduce-person ] ask wolves [ move set energy energy - 1 eat-person death reproduce-wolves ] if model-version = "person-wolves-grass" [ ask patches [ grow-grass ] ] ; tick display-labels end to move rt random 50 lt random 50 fd 1 end to eat-grass if pcolor = green [ set pcolor brown set energy energy + person-gain-from-food ] end to reproduce-person if random-float 100 < person-reproduce [ set energy (energy / 2) hatch 1 [ rt random-float 360 fd 1 ] ] end to reproduce-wolves if random-float 100 < wolf-reproduce [ set energy (energy / 2) hatch 1 [ rt random-float 360 fd 1 ] ] end to eat-person let prey one-of person-here if prey != nobody [ ask prey [ die ] set energy energy + wolf-gain-from-food ] end to death if energy < 0 [ die ] end to grow-grass if pcolor = brown [ ifelse countdown <= 0 [ set pcolor green set countdown grass-regrowth-time ] [ set countdown countdown - 1 ] ] end to-report grass ifelse model-version = "person-wolves-grass" [ report patches with [pcolor = green] ] [ report 0 ] end to display-labels ask turtles [ set label "" ] if show-energy? [ ask wolves [ set label round energy ] if model-version = "person-wolves-grass" [ ask person [ set label round energy ] ] ] end ; Copyright 1997 Uri Wilensky. ; See Info tab for full copyright and license.
There is only one version of this model, created over 5 years ago by Max Fischel.
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