DiffuseModel.js

import World from '/src/World.js'
import Model from '/src/Model.js'
import * as util from '/src/utils.js'

export default class DiffuseModel extends Model {
 population = 4
 speed = 0.5
 wiggleAngle = 10
 startAtCenter = false
 radius = 6
 diffuseRate = 0.05
 seedDelta = 0.1
 seedMax = 0.8

 centerPatch

 // ======================

 constructor(worldOptions = World.defaultOptions(100)) {
 super(worldOptions)
 }

 setup() {
 this.patches.ask(p => {
 p.ran = util.randomFloat(1.0)
 })

 // this.patches.nOf(this.population).ask(p => {
 // p.sprout(1, this.turtles)
 // })
 this.turtles.create(this.population, t => {
 if (!this.startAtCenter) t.moveTo(this.patches.oneOf())
 })

 // this.centerPatch = this.patches.avg('ran') * 10
 this.centerPatch = this.patches.patch(0, 0).ran * 10
 }

 step() {
 this.turtles.ask(t => {
 t.heading += util.randomCentered(this.wiggleAngle)
 t.forward(this.speed)
 this.patches.inRadius(t.patch, this.radius, true).ask(p => {
 p.ran = Math.min(p.ran + this.seedDelta, this.seedMax)
 })
 })

 this.patches.diffuse('ran', this.diffuseRate)

 // this.centerPatch = this.patches.avg('ran') * 10
 this.centerPatch = this.patches.patch(0, 0).ran * 10
 }
}