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kurukuruwidow.user.js

// ==UserScript==
// @name           kurukuruwindow
// @namespace      http://www.hatena.ne.jp/hitode909
// @include        *
// ==/UserScript==

(function() {
    try { if (window != window.parent) return } catch(e) { return };

    var lowPass = { x: 0.0, y: 0.0, z: 0.0 };
    var currentRad = 0;
    var scrollRate = 10;
    window.addEventListener(
        "MozOrientation",
        function(data) {
            
            var xyz = ['x', 'y', 'z'];
            for(var i = 0;i<xyz.length;i++){
                var axis = xyz[i];
                lowPass[axis] = data[axis] * 0.3 + lowPass[axis] * 0.7;
            }
            
            var lastRad = currentRad;
            var atan = Math.atan(lowPass.x / lowPass.z) + (lowPass.z > 0 ? 0 : Math.PI);

            // each 90 deg is nice.
            var newRad = atan = Math.round(atan / (Math.PI/2)) * (Math.PI/2);
            currentRad = currentRad * 0.5 + newRad * 0.5;
            if (Math.abs(currentRad - newRad) < 0.05) currentRad = newRad;
            
            var deg = currentRad * -180 / Math.PI
            var rate = Math.abs(Math.cos(currentRad)); // normal = 1 ~ side = 0
            var scale = rate + (window.innerHeight / window.innerWidth) * (1-rate);

            // rotate, scale
            window.document.body.style.MozTransform = 'rotate(' + deg + 'deg) scale(' + scale + ')';
            if (currentRad != lastRad) {
                // transform origin
                var origin = '' + (window.innerWidth + window.scrollX * 2) * 100 / (window.document.body.offsetWidth * 2) +
                    '% ' + (window.innerHeight + window.scrollY * 2) * 100 / (window.document.body.offsetHeight * 2) + '%';
                window.document.body.style.MozTransformOrigin = origin;
            }
        },
        true);

    window.addEventListener(
        "DOMMouseScroll",
        function scroll(event){
            if (Math.abs(Math.sin(currentRad)) < 0.5) return;
            var dx = Math.sin(currentRad) * event.detail;
            var dy = Math.cos(currentRad) * event.detail;
            window.scrollBy(dx * scrollRate, dy * scrollRate);
	    event.preventDefault();
	},
        true);

})();