var Qcanvas = function() {
    var canvas = document.createElement("canvas");
    canvas.style.position = "absolute";
    canvas.style.top = "0px";
    canvas.style.left = "0px";

    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight;

    document.body.appendChild(canvas);

    return {canvas: canvas, ctx: canvas.getContext("2d")};
};