JS1k: The JavaScript code golfing competition

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

//Width
W = 550;
//Height and Mode
H = M = 380;

z = function () {
  // Toggle mode
  M = !M
  // Points
  P = []
  // Gravity enable
  G = 1
  // Horizontal number of points
  w = M ? 50 : 35
  // Length between points
  s = M ? 7 : 12
  // Gravity force
  g = M ? .15 : .5
  // Tear j
  d = M ? 60 : 90

  for (y=m=E=r=t=0; y < w-20; y  ) {
    for (x=0; x<w; x  ) {
      P.push({
        //If points is dynamic
        dynamic: !y ? !M && x%2 : 1,
        x: w*2   x*s,
        y: y*s,
        'l': x ? P[y * w   (x-1)] : 0,
        't': y ? P[(y-1) * w   x] : 0
      })
    }
  }
  // Cache initial value of x && y
  for (i in P) {
    p = P[i]
    p.X = p.x
    p.Y = p.y
  }
}

//Animation function
A = function () {
  c.clearRect(C=0, 0, W, H)
  c.strokeRect(0, 0, W, H)

  for (i in P) {
    p = P[i];
    S('l') , S('t')
  }

  for (i in P) {
    p = P[i];
    if (p.dynamic || !G) {
      if (m) {
        x = p.x - r;
        y = p.y - t;
        if (Math.sqrt(x*x   y*y) < 20) {
          p.X = p.x - (r - R) * 1.8
          p.Y = p.y - (t - T) * 1.8
        }
      }

      u = (p.x - p.X) * (p.y == H - 1 ? .9 :.99)
      v = (p.y - p.Y) * (G ? .99 : 1)   g * G;

      p.X = p.x
      p.Y = p.y

      p.x  = u;
      p.y  = v;

      p.x  = Math.abs(u) > 3 && (p.x<1 || p.x>W) ? -u * 1.4 : 0
      p.y  = Math.abs(v) > 3 && (p.y<1 || p.y>H) ? -v * 1.4 : 0
      p.x = Math.max(0, Math.min(W-1, p.x))
      p.y = Math.max(0, Math.min(H-1, p.y))
    }
    else {
      p.x = p.X
      p.y = p.Y
    }
    D('t') , D('l')
  }

  c.fillText('Vr:'   w*(w-20)   ' Ls:'   C, 10, 15)
  requestAnimationFrame(A)
}

function D(a) {
  c.beginPath();
  c.arc(p.x, p.y, p.dynamic ? E : 2, 0, 2*Math.PI)
  if (l = p[a]) {
    c.moveTo(p.x, p.y)
    c.lineTo(l.x, l.y)
    if (!M || i - 1 == 0) {
      c.strokeStyle = 'hsl('   [(1-l.d)*160, 100 *l.d * !M '%,58%)']
    }
  }
  c.stroke()
}

function S(a) {
  if (l = p[a]) {
    x = l.x - p.x
    y = l.y - p.y

    j = Math.sqrt(x*x   y*y)
    J = (s-j)/j

    e = j/d

    C  ;

    if (e > 1) {
      p[a] = 0
    }
    x *= J*.4
    y *= J*.4

    l.x  = x
    l.y  = y
    l.d = e
    p.x -= x
    p.y -= y
  }
}

onkeyup = function (e) {
  G = e.keyCode ^ 71 ? G : !G
  E = e.keyCode ^ 86 ? E : !E
  if (e.keyCode == 77) {
    z()
  }
}

onmousedown = onmouseup = function (e) {
  m = e.type[7]
}

onmousemove = function (e) {
  //Mouse positions
  R = r
  T = t
  r = e.pageX
  t = e.pageY
}

z();
A();