Get rid of the function keywords

[rbdr/r.bdr.sh] / js / animation.js

(function () {

  var K = document.querySelector('canvas'),
      { random: R, PI, cos: C, sin: S, floor, atan2: A } = Math,
      r = x => floor(R() * x),
      sqr = i => {
        var p = pos(i)
        x.fillRect(p.x, p.y, siz, siz)
      },
      crc = i => {
        var p = pos(i)
        x.beginPath()
        x.arc(p.x, p.y, siz / 2, 0, 2 * PI)
        x.fill()
      },
      chs = i => {
        var p = pos(i)
        x.beginPath()
        x.moveTo(p.x, p.y)
        x.lineTo(p.x * 10 * C(i.a), p.y * 10 * S(i.a))
        x.lineTo(r(64), r(64))
        x.fill()
      },
      lch = i => {
        var p = pos(i)
        x.beginPath()
        x.lineWidth = 5
        x.strokeStyle = `rgb(${i.c.join(',')})`
        x.moveTo(p.x, p.y)
        x.lineTo(p.x * 10 * C(i.a), p.y * 10 * S(i.a))
        x.stroke()
      },
      hrt = i => {
        var p = pos(i)
        x.fillRect(p.x, p.y, siz, siz)

        x.beginPath()
        x.arc(p.x + siz / 2, p.y, siz / 2, 0, 2 * PI, false)
        x.fill()
        x.closePath()

        x.beginPath()
        x.arc(p.x + siz, p.y + siz / 2, siz / 2, 0, 2 * PI, false)
        x.fill()
        x.closePath()
      },
      id = p => p,
      spn = rad => (p => ({
        x: p.x + rad * C(l),
        y: p.y + rad * S(l)
      })),
      mov = i => {
        i.x = i.x + spd * C(i.a)
        i.y = i.y + spd * S(i.a)

        if (i.x < 0 || i.x > 64) {
          i.a = A(S(i.a), -C(i.a))
        }

        if (i.y < 0 || i.y > 64) {
          i.a = A(-S(i.a), C(i.a))
        }
      },
      ucl = i => i.c = i.c.map(c => (c + 5) % 256),
      frm = t => {
        window.requestAnimationFrame(frm)

        var dt = t - l

        if (dt > 1000 / f) {
          clr && x.clearRect(0, 0, 64, 64)
          for (var i of I) {
            x.fillStyle = `rgb(${i.c.join(',')})`
            draw(i)
            ccl && ucl(i)
            mov(i)
          }

          l = t
        }
      },
      x = K.getContext('2d'),
      f = 24,
      l = 0,
      spd = 1,
      siz = 5 + r(10),
      clr = R() > 0.5,
      ccl = R() > 0.5,
      I = Array(r(10) + 6).fill().map(() => ({
        x: r(64),
        y: r(64),
        a: R() * 2 * PI,
        c: Array(3).fill(r(256))
      })),
      S = [sqr, crc, hrt, chs, lch],
      P = [id, spn(5), spn(15)],
      draw = S[r(S.length)],
      pos = P[r(P.length)]

  frm()
}
)()