MIHS-18 P7 Kevin W, Landon SW
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globals [ max-sheep ] breed [ sheep a-sheep ] breed [ wolves wolf ] breed [humans human] turtles-own [ energy ] patches-own [ countdown ] to setup clear-all ifelse netlogo-web? [set max-sheep 10000] [set max-sheep 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 green ] ] create-sheep initial-number-sheep [ set shape "sheep" set color white set size 1.5 set label-color blue - 2 set energy random (2 * sheep-gain-from-food) setxy random-xcor random-ycor ] create-wolves initial-number-wolves [ set shape "wolf" set color black set size 2 ; set energy random (2 * wolf-gain-from-food) setxy random-xcor random-ycor ] create-humans initial-number-humans [ set shape "person" set color red set size 3 set energy random (2 * humans-gain-from-food) setxy random-xcor random-ycor ] display-labels reset-ticks end to go ; stop the simulation of no wolves or sheep if not any? turtles [ stop ] ; stop the model if there are no wolves and the number of sheep gets very large if not any? wolves and count sheep > max-sheep [ user-message "The sheep have inherited the earth" stop ] ask sheep [ move if model-version = "sheep-wolves-grass" [ ; in this version, sheep eat grass, grass grows and it costs sheep energy to move set energy energy - 1 ; deduct energy for sheep only if running sheep-wolf-grass model version eat-grass ; sheep eat grass only if running sheep-wolf-grass model version death ; sheep die from starvation only if running sheep-wolf-grass model version ] reproduce-sheep ; sheep reproduce at random rate governed by slider ] ask wolves [ move set energy energy - 1 ; wolves lose energy as they move eat-sheep ; wolves eat a sheep on their patch death ; wolves die if our of energy reproduce-wolves ; wolves reproduce at random rate governed by slider ] ask humans [ move set energy energy - 1 eat-sheep eat-wolf death reproduce-wolves ] if model-version = "sheep-wolves-humans-grass" [ ask patches [ grow-grass ] ] tick display-labels end to move ; turtle procedure rt random 50 lt random 50 fd 1 end to eat-grass ; sheep procedure ; sheep eat grass, turn the patch brown if pcolor = green [ set pcolor brown set energy energy + sheep-gain-from-food ; sheep gain energy by eating ] end to reproduce-sheep ; sheep procedure if random-float 100 < sheep-reproduce [ ; throw "dice" to see if you will reproduce set energy (energy / 2) ; divide energy between parent and offspring hatch 1 [ rt random-float 360 fd 1 ] ; hatch an offspring and move it forward 1 step ] end to reproduce-wolves ; wolf procedure if random-float 100 < wolf-reproduce [ ; throw "dice" to see if you will reproduce set energy (energy / 2) ; divide energy between parent and offspring hatch 1 [ rt random-float 360 fd 1 ] ; hatch an offspring and move it forward 1 step ] end to reproduce-humans if random-float 100 < human-reproduce [ set energy (energy / 2) hatch 1 [ rt random-float 360 fd 1 ] ] end to eat-sheep ; wolf procedure let prey one-of sheep-here ; grab a random sheep if prey != nobody [ ; did we get one? if so, ask prey [ die ] ; kill it, and... set energy energy + wolf-gain-from-food ; get energy from eating ] end to eat-wolf ; wolf procedure let prey one-of sheep-here if prey != nobody [ ask prey [ die ] set energy energy + humans-gain-from-food ] end to death ; turtle procedure ; when energy dips below zero, die if energy < 0 [ die ] end to grow-grass ; patch procedure ; countdown on brown patches: if reach 0, grow some 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 = "sheep-wolves-humans-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 = "sheep-wolves-humans-grass" [ ask sheep [ 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 about 5 years ago by Kevin Wang.
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