My Mouse Gestures

A simple mouse gesture script
נכון ליום 17-10-2014. ראה הגרסה האחרונה.
שאל שאלה, פרסם ביקורת, או דווח על הסקריפט.
Wrap lines
// ==UserScript==
// @name           My Mouse Gestures
// @description    A simple mouse gesture script
// @version        0.1.1
// @include        *
// @run-at         document-start
// @grant          GM_openInTab
// @noframes
// @namespace      https://greasyfork.org/users/4968
// ==/UserScript==


// --- Settings ---

var SENSITIVITY = 3; // 1 ~ 5
var TOLERANCE = 3; // 1 ~ 5

var funcs = {
    'DR': function() {
        window.top.close();
    },
    'U': function() {
        window.scrollTo(0, 0);
    },
    'D': function() {
        window.scrollTo(0, 1073741824);
    },
    'L': function() {
        window.history.back();
    },
    'R': function() {
        window.history.forward();
    },
    'RU': function() {
        GM_openInTab('about:newtab', false);
    },
    'UD': function() {
        window.location.reload();
    }
};

// ----------------


var s = 1 << ((7 - SENSITIVITY) << 1);
var t1 = Math.tan(0.15708 * TOLERANCE),
    t2 = 1 / t1;

var x, y, path;

function tracer(e) {
    var cx = e.clientX,
        cy = e.clientY,
        deltaX = cx - x,
        deltaY = cy - y,
        slope = Math.abs(deltaY / deltaX),
        distance = deltaX * deltaX + deltaY * deltaY,
        direction = '';
    if (distance > s) {
        if (slope > t1) {
            if (deltaY > 0) {
                direction = 'D';
            } else {
                direction = 'U';
            }
        } else if (slope <= t2) {
            if (deltaX > 0) {
                direction = 'R';
            } else {
                direction = 'L';
            }
        }
        if (path.slice(-1) != direction) {
            path += direction;
        }
        x = cx;
        y = cy;
    }
}

window.addEventListener('mousedown', function(e) {
    if (e.which == 3) {
        x = e.clientX;
        y = e.clientY;
        path = "";
        window.addEventListener('mousemove', tracer, false);
    }
}, false);

window.addEventListener('contextmenu', function(e) {
    window.removeEventListener('mousemove', tracer, false);
    if (path != "") {
        e.preventDefault();
        if (funcs.hasOwnProperty(path)) {
            funcs[path]();
        }
    }
}, false);