How to use the proton-engine.Radius function in proton-engine

createProton(canvas, width, height) {
    this.proton = new Proton();

    const emitter = new Proton.Emitter();
    emitter.damping = 0.008;
    emitter.rate = new Proton.Rate(150);

    // Initialize
    emitter.addInitialize(new Proton.Mass(1));
    emitter.addInitialize(new Proton.Radius(8));
    emitter.addInitialize(
      new Proton.V(new Proton.Span(0.1, 0.5), new Proton.Span(0, 360), "polar")
    );
    emitter.addInitialize(
      new Proton.Position(
        new Proton.CircleZone(canvas.width / 2, canvas.height / 2, 100)
      )
    );

    // Behaviour
    const crossZoneBehaviour = new Proton.CrossZone(
      new Proton.RectZone(0, 0, canvas.width, canvas.height),
      "cross"
    );
    emitter.addBehaviour(crossZoneBehaviour);
    this.repulsion = new Proton.Repulsion(

value: function createProton(canvas, width, height) {
      var _this2 = this;

      var context = canvas.getContext("2d");
      this.proton = new Proton();

      var emitter = new Proton.Emitter();
      emitter.rate = new Proton.Rate(this.props.num ? new Proton.Span(this.props.num) : new Proton.Span(4, 9), new Proton.Span(0.8, 1.3));

      emitter.addInitialize(new Proton.Mass(1));
      emitter.addInitialize(new Proton.Radius(1, 50));
      emitter.addInitialize(new Proton.Life(5, 6));
      emitter.addInitialize(new Proton.Velocity(new Proton.Span(5, 8), new Proton.Span(30, 70), "polar"));

      emitter.addBehaviour(new Proton.Alpha(1, 0));
      emitter.addBehaviour(new Proton.Color(["#36aaf3", "#fd769c", "#94ff22", "#ffa545", "#ffffff"]));
      emitter.addBehaviour(new Proton.Scale(0.7, 1));
      emitter.addBehaviour(new Proton.Gravity(3));
      emitter.addBehaviour(new Proton.Collision(emitter));
      emitter.addBehaviour(this.customDeadBehaviour(canvas));
      emitter.addBehaviour(new Proton.CrossZone(new Proton.RectZone(0, 0, canvas.width, canvas.height), "bound"));

      emitter.p.x = Math.min(500, Math.max(canvas.width / 2 - 400, 50));
      emitter.p.y = canvas.height / 2 + 50;
      emitter.emit();
      this.proton.addEmitter(emitter);

value: function createProton(canvas, width, height) {
      this.proton = new Proton();

      var emitter = new Proton.Emitter();
      emitter.rate = new Proton.Rate(this.props.num || 20);
      emitter.damping = 0.008;

      emitter.addInitialize(new Proton.Mass(1));
      emitter.addInitialize(new Proton.Radius(30, 600));
      emitter.addInitialize(new Proton.Velocity(new Proton.Span(0.5), new Proton.Span(0, 360), "polar"));
      emitter.addInitialize(new Proton.Position(new Proton.RectZone(0, 0, canvas.width, canvas.height)));

      var crossZoneBehaviour = new Proton.CrossZone(new Proton.RectZone(0, 0, canvas.width, canvas.height), "cross");
      emitter.addBehaviour(crossZoneBehaviour);
      emitter.addBehaviour(new Proton.Alpha(Proton.getSpan(0.35, 0.55)));
      emitter.addBehaviour(new Proton.Color(this.getColor()));
      emitter.addBehaviour(new Proton.RandomDrift(50, 50, 0.5));

      emitter.emit("once");
      this.proton.addEmitter(emitter);

      var renderer = new Proton.CanvasRenderer(canvas);
      this.proton.addRenderer(renderer);

      this.crossZoneBehaviour = crossZoneBehaviour;

color = COLOR,
    zone = "dead",
    once = "all",
    alpha = 0.85,
    gravity = 3.5
  }) {
    const emitter = this.proton.pool.get(Proton.Emitter);

    if (!emitter.completed) {
      emitter.rate = new Proton.Rate(
        this.props.num ? new Proton.Span(this.props.num) : new Proton.Span(4, 9),
        new Proton.Span(1.6, 2.2)
      );

      const radiusInit = mainEmitter
        ? new Proton.Radius(10, 110)
        : new Proton.Radius(3, radius);
      emitter.addInitialize(new Proton.Mass(1));
      emitter.addInitialize(radiusInit);
      emitter.addInitialize(new Proton.Life(3, 6));
      emitter.addInitialize(
        new Proton.Velocity(
          new Proton.Span(4, 6),
          new Proton.Span(-90, 90),
          "polar"
        )
      );

      emitter.addBehaviour(new Proton.Alpha(alpha, 0.2));
      emitter.addBehaviour(new Proton.Color(color));
      emitter.addBehaviour(new Proton.Scale(1, 0.3));
      emitter.addBehaviour(new Proton.Rotate());

const tha = config.tha ? new Proton.Span(config.tha[0], config.tha[1]) : new Proton.Span(-30, 30);
  const v = config.v ? new Proton.Span(config.v * 0.8, config.v) : new Proton.Span(0.6, 1.2);

  if (config.alpha) {
    if (Array.isArray(config.alpha)) {
      emitter.addBehaviour(new Proton.Alpha(config.alpha[0], config.alpha[1]));
    } else {
      emitter.addBehaviour(new Proton.Alpha(config.alpha));
    }
  } else {
    emitter.addBehaviour(new Proton.Alpha(Proton.getSpan(0.6, 0.9)));
  }

  if (config.radius) {
    const r = config.radius;
    const radius = new Proton.Radius(r * 0.5, r);
    emitter.addInitialize(radius);
  } else {
    const radius = new Proton.Radius(1, 2);
    emitter.addInitialize(radius);
  }

  const g = config.g || 2.5;

  if (config.random) {
    emitter.addBehaviour(new Proton.RandomDrift(config.random, config.random, 0.2));
  }

  emitter.addInitialize(new Proton.Mass(1));
  emitter.addInitialize(life);
  emitter.addInitialize(new Proton.Velocity(v, tha, "polar"));
  emitter.addBehaviour(new Proton.Color(color));

createProton(canvas, width, height) {
    this.proton = new Proton();

    const emitter = new Proton.Emitter();
    emitter.damping = 0.008;
    emitter.rate = new Proton.Rate(250);
    emitter.addInitialize(new Proton.Mass(1));
    emitter.addInitialize(new Proton.Radius(4));
    emitter.addInitialize(
      new Proton.Velocity(
        new Proton.Span(1.5),
        new Proton.Span(0, 360),
        "polar"
      )
    );
    const mouseObj = {
      x: width / 2,
      y: height / 2
    };

    const attractionBehaviour = new Proton.Attraction(mouseObj, 0, 0);
    const crossZoneBehaviour = new Proton.CrossZone(
      new Proton.RectZone(0, 0, canvas.width, canvas.height),
      "cross"

createProton(canvas, width, height) {
    this.proton = new Proton();

    const emitter = new Proton.Emitter();
    emitter.rate = new Proton.Rate(
      new Proton.Span(100),
      new Proton.Span(0.05, 0.2)
    );

    emitter.addInitialize(new Proton.Mass(1));
    emitter.addInitialize(new Proton.Radius(1, 4));
    emitter.addInitialize(new Proton.Life(Infinity));

    const pointZone = new Proton.Position(
      new Proton.RectZone(0, 0, width, height)
    );
    emitter.addInitialize(pointZone);
    emitter.addInitialize(
      new Proton.Velocity(
        new Proton.Span(0.3, 0.6),
        new Proton.Span(0, 360),
        "polar"
      )
    );

    emitter.addBehaviour(new Proton.Alpha(Proton.getSpan(0.2, 0.9)));
    emitter.addBehaviour(new Proton.Color("#ffffff"));

color = _ref$color === undefined ? COLOR : _ref$color,
          _ref$zone = _ref.zone,
          zone = _ref$zone === undefined ? "dead" : _ref$zone,
          _ref$once = _ref.once,
          once = _ref$once === undefined ? "all" : _ref$once,
          _ref$alpha = _ref.alpha,
          alpha = _ref$alpha === undefined ? 0.85 : _ref$alpha,
          _ref$gravity = _ref.gravity,
          gravity = _ref$gravity === undefined ? 3.5 : _ref$gravity;

      var emitter = this.proton.pool.get(Proton.Emitter);

      if (!emitter.completed) {
        emitter.rate = new Proton.Rate(this.props.num ? new Proton.Span(this.props.num) : new Proton.Span(4, 9), new Proton.Span(1.6, 2.2));

        var radiusInit = mainEmitter ? new Proton.Radius(10, 110) : new Proton.Radius(3, radius);
        emitter.addInitialize(new Proton.Mass(1));
        emitter.addInitialize(radiusInit);
        emitter.addInitialize(new Proton.Life(3, 6));
        emitter.addInitialize(new Proton.Velocity(new Proton.Span(4, 6), new Proton.Span(-90, 90), "polar"));

        emitter.addBehaviour(new Proton.Alpha(alpha, 0.2));
        emitter.addBehaviour(new Proton.Color(color));
        emitter.addBehaviour(new Proton.Scale(1, 0.3));
        emitter.addBehaviour(new Proton.Rotate());
        emitter.addBehaviour(new Proton.Gravity(gravity));

        emitter.addBehaviour(this.customDeadBehaviour(canvas));
        emitter.addBehaviour(new Proton.CrossZone(new Proton.RectZone(0, 0, canvas.width, canvas.height), zone));
      }

      emitter.p.x = x;

createProton(canvas, width, height) {
    const context = canvas.getContext("2d");
    this.proton = new Proton();

    const emitter = new Proton.Emitter();
    emitter.rate = new Proton.Rate(
      this.props.num ? new Proton.Span(this.props.num) : new Proton.Span(4, 9),
      new Proton.Span(0.8, 1.3)
    );

    emitter.addInitialize(new Proton.Mass(1));
    emitter.addInitialize(new Proton.Radius(1, 50));
    emitter.addInitialize(new Proton.Life(5, 6));
    emitter.addInitialize(
      new Proton.Velocity(
        new Proton.Span(5, 8),
        new Proton.Span(30, 70),
        "polar"
      )
    );

    emitter.addBehaviour(new Proton.Alpha(1, 0));
    emitter.addBehaviour(
      new Proton.Color(["#36aaf3", "#fd769c", "#94ff22", "#ffa545", "#ffffff"])
    );
    emitter.addBehaviour(new Proton.Scale(0.7, 1));
    emitter.addBehaviour(new Proton.Gravity(3));
    emitter.addBehaviour(new Proton.Collision(emitter));