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An example of an SIR epidemiological model in Agentscript
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| <html> | |
| <head> | |
| <title>SIR Model</title> | |
| <script src="http://agentscript.org/lib/agentscript.js"></script> | |
| <script src="http://agentscript.org/tools/coffee-script.js"></script> | |
| <script type="text/coffeescript"> | |
| u = ABM.util # ABM.util alias, u.s is also ABM.shapes accessor. | |
| log = (arg) -> console.log arg | |
| class MyModel extends ABM.Model | |
| setVision: (@vision) -> @patches.cacheRect @vision, true | |
| setup: -> # called by Model.constructor | |
| u.randomSeed() | |
| @population = 100 | |
| @nums = 99 | |
| @numi = 1 | |
| @numr = 0 | |
| @size = 1.0 # size in patch coords | |
| @speed = .1 # move forward this amount in patch coords | |
| @wiggle = u.degToRad(30) # degrees/radians to wiggle | |
| @startCircle = false # initialize agents randomly or in circle | |
| @setVision 3 | |
| @agents.setDefault "size", @size | |
| # @agents.setUseSprites() | |
| @anim.setRate 30, false | |
| for p in @patches | |
| p.color = [0,0,0] | |
| for a in @agents.create @population | |
| a.shape = "person" | |
| a.state = "S" | |
| if @startCircle | |
| a.forward @patches.maxX/2 # start in circle | |
| else | |
| a.setXY @patches.randomPt()... # set random location | |
| @agents[0].state = "I" | |
| for a in @agents | |
| if a.state is "I" | |
| a.color=[255,0,0] | |
| else | |
| a.color=[0,0,255] | |
| step: -> # called by Model.animate | |
| @updateAgents(a) for a in @agents | |
| updateAgents: (a) -> # a is agent | |
| if a.state is "S" | |
| neighbours = @agents.inRadius a, @vision | |
| if neighbours.length isnt 0 | |
| [nearestNeighbour, d] = u.minOneOf neighbours, ((f) -> f.distance a), true | |
| if nearestNeighbour.state is "I" | |
| @infectAgent(a) | |
| else | |
| if a.state is "I" | |
| if u.randomFloat(1.0) < 0.01 | |
| @recoverAgent(a) | |
| a.rotate u.randomCentered @wiggle | |
| a.forward @speed | |
| infectAgent: (a) -> # a is agent | |
| a.state="I" | |
| a.color=[255,0,0] | |
| @nums-- | |
| @numi++ | |
| log "#{@nums} #{@numi} #{@numr}" | |
| recoverAgent: (a) -> # a is agent | |
| a.state="R" | |
| a.color=[0,255,0] | |
| @numi-- | |
| @numr++ | |
| log "#{@nums} #{@numi} #{@numr}" | |
| model = new MyModel("layers", 13, -16, 16, -16, 16, true, false) | |
| .debug() | |
| .start() | |
| </script> | |
| </head> | |
| <body> | |
| <div id="layers"></div> | |
| </body> | |
| </html> |
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