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✏️ Editing: jquery.knob.js

/*!jQuery Knob*/
/**
 * Downward compatible, touchable dial
 *
 * Version: 1.2.11
 * 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 (factory) {
    if (typeof exports === 'object') {
        // CommonJS
        module.exports = factory(require('jquery'));
    } else if (typeof define === 'function' && define.amd) {
        // AMD. Register as an anonymous module.
        define(['jquery'], factory);
    } else {
        // Browser globals
        factory(jQuery);
    }
}(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') !== undefined ? this.$.data('min') : 0,
                    max: this.$.data('max') !== undefined ? 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.$.data('step') || 1,
                    rotation: this.$.data('rotation'),

// Hooks
                    draw: null, // function () {}
                    change: null, // function (value) {}
                    cancel: null, // function () {}
                    release: null, // function (value) {}

// Output formatting, allows to add unit: %, ms ...
                    format: function(v) {
                        return v;
                    },
                    parse: function (v) {
                        return parseFloat(v);
                    }
                }, this.o
            );

// finalize options
            this.o.flip = this.o.rotation === 'anticlockwise' || this.o.rotation === 'acw';
            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] = $this;
                    s.v[k] = s.o.parse($this.val());

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

// input = integer
                this.i = this.$;
                this.v = this.o.parse(this.$.val());
                this.v === '' && (this.v = this.o.min);
                this.$.bind(
                    'change blur',
                    function () {
                        s.val(s._validate(s.o.parse(s.$.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;

this.$.val(this.o.format(this.v));
            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) {
            var val = (~~ (((v < 0) ? -0.5 : 0.5) + (v/this.o.step))) * this.o.step;
            return Math.round(val * 100) / 100;
        };

// 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) {

// reverse format
                v = this.o.parse(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.o.format(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.o.flip) {
                a = this.angleArc - a - this.PI2;
            }

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 = (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.o.parse(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                   // -
                            && (kc !== 190
                                || s.$.val().match(/\./))   // . allowed once
                            && e.preventDefault();

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

var v = s.o.parse(s.$.val()) + kv[kc] * m;
                                s.o.stopper && (v = max(min(v, s.o.max), s.o.min));

s.change(s._validate(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(this.o.format(v));
        };

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

this.arc = function (v) {
          var sa, ea;
          v = this.angle(v);
          if (this.o.flip) {
              sa = this.endAngle + 0.00001;
              ea = sa - v - 0.00001;
          } else {
              sa = this.startAngle - 0.00001;
              ea = sa + v + 0.00001;
          }
          this.o.cursor
              && (sa = ea - this.cursorExt)
              && (ea = ea + this.cursorExt);

return {
              s: sa,
              e: ea,
              d: this.o.flip && !this.o.cursor
          };
        };

this.draw = function () {
            var c = this.g,                 // context
                a = this.arc(this.cv),      // Arc
                pa,                         // Previous arc
                r = 1;

c.lineWidth = this.lineWidth;
            c.lineCap = this.lineCap;

if (this.o.bgColor !== "none") {
                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) {
                pa = this.arc(this.v);
                c.beginPath();
                c.strokeStyle = this.pColor;
                c.arc(this.xy, this.xy, this.radius, pa.s, pa.e, pa.d);
                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, a.s, a.e, a.d);
            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();
    };

}));

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