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EDITING: jquery.knob.js

/*!jQuery Knob*/
/**
 * Downward compatible, touchable dial
 *
 * Version: 1.2.0 (15/07/2012)
 * Requires: jQuery v1.7+
 *
 * Copyright (c) 2012 Anthony Terrien
 * Under MIT License (http://www.opensource.org/licenses/mit-license.php)
 *
 * Thanks to vor, eskimoblood, spiffistan, FabrizioC
 */
(function($) {

/**
     * Kontrol library
     */
    "use strict";

/**
     * Definition of globals and core
     */
    var k = {}, // kontrol
        max = Math.max,
        min = Math.min;

k.c = {};
    k.c.d = $(document);
    k.c.t = function (e) {
        return e.originalEvent.touches.length - 1;
    };

/**
     * Kontrol Object
     *
     * Definition of an abstract UI control
     *
     * Each concrete component must call this one.
     * <code>
     * k.o.call(this);
     * </code>
     */
    k.o = function () {
        var s = this;

this.o = null; // array of options
        this.$ = null; // jQuery wrapped element
        this.i = null; // mixed HTMLInputElement or array of HTMLInputElement
        this.g = null; // deprecated 2D graphics context for 'pre-rendering'
        this.v = null; // value ; mixed array or integer
        this.cv = null; // change value ; not commited value
        this.x = 0; // canvas x position
        this.y = 0; // canvas y position
        this.w = 0; // canvas width
        this.h = 0; // canvas height
        this.$c = null; // jQuery canvas element
        this.c = null; // rendered canvas context
        this.t = 0; // touches index
        this.isInit = false;
        this.fgColor = null; // main color
        this.pColor = null; // previous color
        this.dH = null; // draw hook
        this.cH = null; // change hook
        this.eH = null; // cancel hook
        this.rH = null; // release hook
        this.scale = 1; // scale factor
        this.relative = false;
        this.relativeWidth = false;
        this.relativeHeight = false;
        this.$div = null; // component div

this.run = function () {
            var cf = function (e, conf) {
                var k;
                for (k in conf) {
                    s.o[k] = conf[k];
                }
                s._carve().init();
                s._configure()
                 ._draw();
            };

if(this.$.data('kontroled')) return;
            this.$.data('kontroled', true);

this.extend();
            this.o = $.extend(
                {
                    // Config
                    min : this.$.data('min') || 0,
                    max : this.$.data('max') || 100,
                    stopper : true,
                    readOnly : this.$.data('readonly') || (this.$.attr('readonly') === 'readonly'),

// UI
                    cursor : (this.$.data('cursor') === true && 30) ||
                                this.$.data('cursor') || 0,
                    thickness : (
                                    this.$.data('thickness') &&
                                    Math.max(Math.min(this.$.data('thickness'), 1), 0.01)
                                ) || 0.35,
                    lineCap : this.$.data('linecap') || 'butt',
                    width : this.$.data('width') || 200,
                    height : this.$.data('height') || 200,
                    displayInput : this.$.data('displayinput') == null || this.$.data('displayinput'),
                    displayPrevious : this.$.data('displayprevious'),
                    fgColor : this.$.data('fgcolor') || '#87CEEB',
                    inputColor: this.$.data('inputcolor'),
                    font: this.$.data('font') || 'Arial',
                    fontWeight: this.$.data('font-weight') || 'bold',
                    inline : false,
                    step : this.$.data('step') || 1,

// Hooks
                    draw : null, // function () {}
                    change : null, // function (value) {}
                    cancel : null, // function () {}
                    release : null // function (value) {}
                }, this.o
            );

// finalize options
            if(!this.o.inputColor) {
                this.o.inputColor = this.o.fgColor;
            }

// routing value
            if(this.$.is('fieldset')) {

// fieldset = array of integer
                this.v = {};
                this.i = this.$.find('input');
                this.i.each(function(k) {
                    var $this = $(this);
                    s.i[k] = $this;
                    s.v[k] = $this.val();

$this.bind(
                        'change blur'
                        , function () {
                            var val = {};
                            val[k] = $this.val();
                            s.val(val);
                        }
                    );
                });
                this.$.find('legend').remove();

} else {

// input = integer
                this.i = this.$;
                this.v = this.$.val();
                (this.v === '') && (this.v = this.o.min);

this.$.bind(
                    'change blur'
                    , function () {
                        s.val(s._validate(s.$.val()));
                    }
                );

}

(!this.o.displayInput) && this.$.hide();

// adds needed DOM elements (canvas, div)
            this.$c = $(document.createElement('canvas')).attr({
                width: this.o.width,
                height: this.o.height
            });

// wraps all elements in a div
            // add to DOM before Canvas init is triggered
            this.$div = $('<div style="'
                + (this.o.inline ? 'display:inline;' : '')
                + 'width:' + this.o.width + 'px;height:' + this.o.height + 'px;'
                + '"></div>');

this.$.wrap(this.$div).before(this.$c);
            this.$div = this.$.parent();

if (typeof G_vmlCanvasManager !== 'undefined') {
              G_vmlCanvasManager.initElement(this.$c[0]);
            }

this.c = this.$c[0].getContext ? this.$c[0].getContext('2d') : null;

if (!this.c) {
                throw {
                    name:        "CanvasNotSupportedException",
                    message:     "Canvas not supported. Please use excanvas on IE8.0.",
                    toString:    function(){return this.name + ": " + this.message}
                }
            }

// hdpi support
            this.scale = (window.devicePixelRatio || 1) /
                        (
                            this.c.webkitBackingStorePixelRatio ||
                            this.c.mozBackingStorePixelRatio ||
                            this.c.msBackingStorePixelRatio ||
                            this.c.oBackingStorePixelRatio ||
                            this.c.backingStorePixelRatio || 1
                        );

// detects relative width / height
            this.relativeWidth = ((this.o.width % 1 !== 0) &&
                this.o.width.indexOf('%'));
            this.relativeHeight = ((this.o.height % 1 !== 0) &&
                this.o.height.indexOf('%'));
            this.relative = (this.relativeWidth || this.relativeHeight);

// computes size and carves the component
            this._carve();

// prepares props for transaction
            if (this.v instanceof Object) {
                this.cv = {};
                this.copy(this.v, this.cv);
            } else {
                this.cv = this.v;
            }

// binds configure event
            this.$
                .bind("configure", cf)
                .parent()
                .bind("configure", cf);

// finalize init
            this._listen()
                ._configure()
                ._xy()
                .init();

this.isInit = true;

// the most important !
            this._draw();

return this;
        };

this._carve = function() {
            if(this.relative) {
                var w = this.relativeWidth ?
                            this.$div.parent().width() *
                            parseInt(this.o.width) / 100 :
                            this.$div.parent().width(),
                    h = this.relativeHeight ?
                            this.$div.parent().height() *
                            parseInt(this.o.height) / 100 :
                            this.$div.parent().height();

// apply relative
                this.w = this.h = Math.min(w, h);
            } else {
                this.w = this.o.width;
                this.h = this.o.height;
            }

// finalize div
            this.$div.css({
                'width': this.w + 'px',
                'height': this.h + 'px'
            });

// finalize canvas with computed width
            this.$c.attr({
                width: this.w,
                height: this.h
            });

// scaling
            if (this.scale !== 1) {
                this.$c[0].width = this.$c[0].width * this.scale;
                this.$c[0].height = this.$c[0].height * this.scale;
                this.$c.width(this.w);
                this.$c.height(this.h);
            }

return this;
        }

this._draw = function () {

// canvas pre-rendering
            var d = true;

s.g = s.c;

s.clear();

s.dH
            && (d = s.dH());

(d !== false) && s.draw();

};

this._touch = function (e) {

var touchMove = function (e) {

var v = s.xy2val(
                            e.originalEvent.touches[s.t].pageX,
                            e.originalEvent.touches[s.t].pageY
                            );

if (v == s.cv) return;

if (s.cH && (s.cH(v) === false)) return;

s.change(s._validate(v));
                s._draw();
            };

// get touches index
            this.t = k.c.t(e);

// First touch
            touchMove(e);

// Touch events listeners
            k.c.d
                .bind("touchmove.k", touchMove)
                .bind(
                    "touchend.k"
                    , function () {
                        k.c.d.unbind('touchmove.k touchend.k');
                        s.val(s.cv);
                    }
                );

return this;
        };

this._mouse = function (e) {

var mouseMove = function (e) {
                var v = s.xy2val(e.pageX, e.pageY);

if (v == s.cv) return;

if (s.cH && (s.cH(v) === false)) return;

s.change(s._validate(v));
                s._draw();
            };

// First click
            mouseMove(e);

// Mouse events listeners
            k.c.d
                .bind("mousemove.k", mouseMove)
                .bind(
                    // Escape key cancel current change
                    "keyup.k"
                    , function (e) {
                        if (e.keyCode === 27) {
                            k.c.d.unbind("mouseup.k mousemove.k keyup.k");

if (
                                s.eH
                                && (s.eH() === false)
                            ) return;

s.cancel();
                        }
                    }
                )
                .bind(
                    "mouseup.k"
                    , function (e) {
                        k.c.d.unbind('mousemove.k mouseup.k keyup.k');
                        s.val(s.cv);
                    }
                );

return this;
        };

this._xy = function () {
            var o = this.$c.offset();
            this.x = o.left;
            this.y = o.top;
            return this;
        };

this._listen = function () {

if (!this.o.readOnly) {
                this.$c
                    .bind(
                        "mousedown"
                        , function (e) {
                            e.preventDefault();
                            s._xy()._mouse(e);
                         }
                    )
                    .bind(
                        "touchstart"
                        , function (e) {
                            e.preventDefault();
                            s._xy()._touch(e);
                         }
                    );

this.listen();
            } else {
                this.$.attr('readonly', 'readonly');
            }

if(this.relative) {
                $(window).resize(function() {
                    s._carve()
                     .init();
                    s._draw();
                });
            }

return this;
        };

this._configure = function () {

// Hooks
            if (this.o.draw) this.dH = this.o.draw;
            if (this.o.change) this.cH = this.o.change;
            if (this.o.cancel) this.eH = this.o.cancel;
            if (this.o.release) this.rH = this.o.release;

if (this.o.displayPrevious) {
                this.pColor = this.h2rgba(this.o.fgColor, "0.4");
                this.fgColor = this.h2rgba(this.o.fgColor, "0.6");
            } else {
                this.fgColor = this.o.fgColor;
            }

return this;
        };

this._clear = function () {
            this.$c[0].width = this.$c[0].width;
        };

this._validate = function(v) {
            return (~~ (((v < 0) ? -0.5 : 0.5) + (v/this.o.step))) * this.o.step;
        };

// Abstract methods
        this.listen = function () {}; // on start, one time
        this.extend = function () {}; // each time configure triggered
        this.init = function () {}; // each time configure triggered
        this.change = function (v) {}; // on change
        this.val = function (v) {}; // on release
        this.xy2val = function (x, y) {}; //
        this.draw = function () {}; // on change / on release
        this.clear = function () { this._clear(); };

// Utils
        this.h2rgba = function (h, a) {
            var rgb;
            h = h.substring(1,7)
            rgb = [parseInt(h.substring(0,2),16)
                   ,parseInt(h.substring(2,4),16)
                   ,parseInt(h.substring(4,6),16)];
            return "rgba(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + "," + a + ")";
        };

this.copy = function (f, t) {
            for (var i in f) { t[i] = f[i]; }
        };
    };

/**
     * k.Dial
     */
    k.Dial = function () {
        k.o.call(this);

this.startAngle = null;
        this.xy = null;
        this.radius = null;
        this.lineWidth = null;
        this.cursorExt = null;
        this.w2 = null;
        this.PI2 = 2*Math.PI;

this.extend = function () {
            this.o = $.extend(
                {
                    bgColor : this.$.data('bgcolor') || '#EEEEEE',
                    angleOffset : this.$.data('angleoffset') || 0,
                    angleArc : this.$.data('anglearc') || 360,
                    inline : true
                }, this.o
            );
        };

this.val = function (v, triggerRelease) {
            if (null != v) {

if (
                    triggerRelease !== false && (v != this.v) && this.rH &&
                        (this.rH(v) === false)
                ) return;

this.cv = this.o.stopper ? max(min(v, this.o.max), this.o.min) : v;
                this.v = this.cv;
                this.$.val(this.v);
                this._draw();
            } else {
                return this.v;
            }
        };

this.xy2val = function (x, y) {
            var a, ret;

a = Math.atan2(
                        x - (this.x + this.w2)
                        , - (y - this.y - this.w2)
                    ) - this.angleOffset;

if(this.angleArc != this.PI2 && (a < 0) && (a > -0.5)) {
                // if isset angleArc option, set to min if .5 under min
                a = 0;
            } else if (a < 0) {
                a += this.PI2;
            }

ret = ~~ (0.5 + (a * (this.o.max - this.o.min) / this.angleArc))
                    + this.o.min;

this.o.stopper && (ret = max(min(ret, this.o.max), this.o.min));

return ret;
        };

this.listen = function () {
            // bind MouseWheel
            var s = this, mwTimerStop, mwTimerRelease,
                mw = function (e) {
                    e.preventDefault();

var ori = e.originalEvent
                        ,deltaX = ori.detail || ori.wheelDeltaX
                        ,deltaY = ori.detail || ori.wheelDeltaY
                        ,v = s._validate(s.$.val())
                            + (deltaX>0 || deltaY>0 ? s.o.step : deltaX<0 || deltaY<0 ? -s.o.step : 0);

v = max(min(v, s.o.max), s.o.min);

s.val(v, false);

if(s.rH) {
                        // Handle mousewheel stop
                        clearTimeout(mwTimerStop);
                        mwTimerStop = setTimeout(function() {
                            s.rH(v);
                            mwTimerStop = null;
                        }, 100);

// Handle mousewheel releases
                        if(!mwTimerRelease) {
                            mwTimerRelease = setTimeout(function() {
                                if(mwTimerStop) s.rH(v);
                                mwTimerRelease = null;
                            }, 200);
                        }
                    }
                }
                , kval, to, m = 1, kv = {37:-s.o.step, 38:s.o.step, 39:s.o.step, 40:-s.o.step};

this.$
                .bind(
                    "keydown"
                    ,function (e) {
                        var kc = e.keyCode;

// numpad support
                        if(kc >= 96 && kc <= 105) {
                            kc = e.keyCode = kc - 48;
                        }

kval = parseInt(String.fromCharCode(kc));

if (isNaN(kval)) {

(kc !== 13)         // enter
                            && (kc !== 8)       // bs
                            && (kc !== 9)       // tab
                            && (kc !== 189)     // -
                            && e.preventDefault();

// arrows
                            if ($.inArray(kc,[37,38,39,40]) > -1) {
                                e.preventDefault();

var v = parseInt(s.$.val()) + kv[kc] * m;

s.o.stopper && (v = max(min(v, s.o.max), s.o.min));

s.change(v);
                                s._draw();

// long time keydown speed-up
                                to = window.setTimeout(
                                    function () { m *= 2; }, 30
                                );
                            }
                        }
                    }
                )
                .bind(
                    "keyup"
                    ,function (e) {
                        if (isNaN(kval)) {
                            if (to) {
                                window.clearTimeout(to);
                                to = null;
                                m = 1;
                                s.val(s.$.val());
                            }
                        } else {
                            // kval postcond
                            (s.$.val() > s.o.max && s.$.val(s.o.max))
                            || (s.$.val() < s.o.min && s.$.val(s.o.min));
                        }

}
                );

this.$c.bind("mousewheel DOMMouseScroll", mw);
            this.$.bind("mousewheel DOMMouseScroll", mw)
        };

this.init = function () {

if (
                this.v < this.o.min
                || this.v > this.o.max
            ) this.v = this.o.min;

this.$.val(this.v);
            this.w2 = this.w / 2;
            this.cursorExt = this.o.cursor / 100;
            this.xy = this.w2 * this.scale;
            this.lineWidth = this.xy * this.o.thickness;
            this.lineCap = this.o.lineCap;
            this.radius = this.xy - this.lineWidth / 2;

this.o.angleOffset
            && (this.o.angleOffset = isNaN(this.o.angleOffset) ? 0 : this.o.angleOffset);

this.o.angleArc
            && (this.o.angleArc = isNaN(this.o.angleArc) ? this.PI2 : this.o.angleArc);

// deg to rad
            this.angleOffset = this.o.angleOffset * Math.PI / 180;
            this.angleArc = this.o.angleArc * Math.PI / 180;

// compute start and end angles
            this.startAngle = 1.5 * Math.PI + this.angleOffset;
            this.endAngle = 1.5 * Math.PI + this.angleOffset + this.angleArc;

var s = max(
                            String(Math.abs(this.o.max)).length
                            , String(Math.abs(this.o.min)).length
                            , 2
                            ) + 2;

this.o.displayInput
                && this.i.css({
                        'width' : ((this.w / 2 + 4) >> 0) + 'px'
                        ,'height' : ((this.w / 3) >> 0) + 'px'
                        ,'position' : 'absolute'
                        ,'vertical-align' : 'middle'
                        ,'margin-top' : ((this.w / 3) >> 0) + 'px'
                        ,'margin-left' : '-' + ((this.w * 3 / 4 + 2) >> 0) + 'px'
                        ,'border' : 0
                        ,'background' : 'none'
                        ,'font' : this.o.fontWeight + ' ' + ((this.w / s) >> 0) + 'px ' + this.o.font
                        ,'text-align' : 'center'
                        ,'color' : this.o.inputColor || this.o.fgColor
                        ,'padding' : '0px'
                        ,'-webkit-appearance': 'none'
                        })
                || this.i.css({
                        'width' : '0px'
                        ,'visibility' : 'hidden'
                        });
        };

this.change = function (v) {
            this.cv = v;
            this.$.val(v);
        };

this.angle = function (v) {
            return (v - this.o.min) * this.angleArc / (this.o.max - this.o.min);
        };

this.draw = function () {

var c = this.g,                 // context
                a = this.angle(this.cv)    // Angle
                , sat = this.startAngle     // Start angle
                , eat = sat + a             // End angle
                , sa, ea                    // Previous angles
                , r = 1;

c.lineWidth = this.lineWidth;

c.lineCap = this.lineCap;

this.o.cursor
                && (sat = eat - this.cursorExt)
                && (eat = eat + this.cursorExt);

c.beginPath();
                c.strokeStyle = this.o.bgColor;
                c.arc(this.xy, this.xy, this.radius, this.endAngle - 0.00001, this.startAngle + 0.00001, true);
            c.stroke();

if (this.o.displayPrevious) {
                ea = this.startAngle + this.angle(this.v);
                sa = this.startAngle;
                this.o.cursor
                    && (sa = ea - this.cursorExt)
                    && (ea = ea + this.cursorExt);

c.beginPath();
                    c.strokeStyle = this.pColor;
                    c.arc(this.xy, this.xy, this.radius, sa - 0.00001, ea + 0.00001, false);
                c.stroke();
                r = (this.cv == this.v);
            }

c.beginPath();
                c.strokeStyle = r ? this.o.fgColor : this.fgColor ;
                c.arc(this.xy, this.xy, this.radius, sat - 0.00001, eat + 0.00001, false);
            c.stroke();
        };

this.cancel = function () {
            this.val(this.v);
        };
    };

$.fn.dial = $.fn.knob = function (o) {
        return this.each(
            function () {
                var d = new k.Dial();
                d.o = o;
                d.$ = $(this);
                d.run();
            }
        ).parent();
    };

})(jQuery);