alien.es6.js

class Alien {
  constructor (attachTo, size = 600, parts = 16, frequency = 0.5) {
    this.two = new Two({ width: size, height: size }).appendTo(attachTo)
    this.size = size
    this.parts = parts
    this.partSize = this.size / this.parts
    this.frequency = frequency
  }

  draw () {
    const fill = Color.random().toPastel().toString()
    
    this.two.clear()
    
    for (var i = 0; i < this.parts / 2; i++) {
      for (var j = 0; j < this.parts; j++) {
        if (Math.random() < this.frequency) {
          var rect = this.two.makeRectangle(this._x(i), this._y(j), this.partSize, this.partSize)
          var rect2 = this.two.makeRectangle(this._mirroredX(i), this._y(j), this.partSize, this.partSize)
          rect.fill = rect2.fill = fill
          rect.noStroke()
          rect2.noStroke()
        }
      }
    }

    this.two.update()
  }

  _x (i) {
    return i * this.partSize + this.partSize / 2
  }

  _y (j) {
    return this._x(j)
  }

  _mirroredX (i) {
    return this.size - this._x(i) - this.partSize
  }
}