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var canvas = document.getElementById( 'canvas' ),
ctx = canvas.getContext( '2d' ),
canvas2 = document.getElementById( 'canvas2' ),
ctx2 = canvas2.getContext( '2d' ),
// full screen dimensions
cw = window.innerWidth,
ch = window.innerHeight,
charArr = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'],
maxCharCount = 100,
fallingCharArr = [],
fontSize = 10,
maxColums = cw/(fontSize);
canvas.width = canvas2.width = cw;
canvas.height = canvas2.height = ch;

function randomInt( min, max ) {
return Math.floor(Math.random() * ( max - min ) + min);
}

function randomFloat( min, max ) {
return Math.random() * ( max - min ) + min;
}

function Point(x,y)
{
this.x = x;
this.y = y;
}

Point.prototype.draw = function(ctx){

this.value = charArr[randomInt(0,charArr.length-1)].toUpperCase();
this.speed = randomFloat(1,5);

ctx2.fillStyle = "rgba(255,255,255,0.8)";
ctx2.font = fontSize+"px san-serif";
ctx2.fillText(this.value,this.x,this.y);

ctx.fillStyle = "#0F0";
ctx.font = fontSize+"px san-serif";
ctx.fillText(this.value,this.x,this.y);

this.y += this.speed;
if(this.y > ch)
{
this.y = randomFloat(-100,0);
this.speed = randomFloat(2,5);
}
}

for(var i = 0; i < maxColums ; i++) {
fallingCharArr.push(new Point(i*fontSize,randomFloat(-500,0)));
}

var update = function()
{

ctx.fillStyle = "rgba(0,0,0,0.05)";
ctx.fillRect(0,0,cw,ch);

ctx2.clearRect(0,0,cw,ch);

var i = fallingCharArr.length;

while (i--) {
fallingCharArr[i].draw(ctx);
var v = fallingCharArr[i];
}

requestAnimationFrame(update);
}

update();