document.addEventListener('touchmove', function (e) {
    e.preventDefault()
})
var c = document.getElementsByTagName('canvas')[0],
    x = c.getContext('2d'),
    pr = window.devicePixelRatio || 1,
    w = window.innerWidth,
    h = window.innerHeight,
    f = 90,
    q,
    m = Math,
    r = 0,
    u = m.PI*2,
    v = m.cos,
    z = m.random;
c.width = w*pr;
c.height = h*pr;
x.scale(pr, pr);
x.globalAlpha = 0.8;
function i(){
    x.clearRect(0,0,w,h)
    q=[{x:0,y:h*.7+f},{x:0,y:h*.7-f}]
    while(q[1].x<w+f) d(q[0], q[1])
}
function d(i,j){   
    x.beginPath()
    x.moveTo(i.x, i.y)
    x.lineTo(j.x, j.y)
    var k = j.x + (z()*2-0.25)*f,
        n = y(j.y)
    x.lineTo(k, n)
    x.closePath()
    r-=u/-50
    x.fillStyle = '#'+(v(r)*127+128<<16 | v(r+u/3)*127+128<<8 | v(r+u/3*2)*127+128).toString(16)
    x.fill()
    q[0] = q[1]
    q[1] = {x:k,y:n}
}
function y(p){
    var t = p + (z()*2-1.1)*f
    return (t>h||t<0) ? y(p) : t
}
i()