minix/share/beaglebone/weather/spin.js

   1 //fgnass.github.com/spin.js#v1.3.2
   2
   3 /**
   4  * Copyright (c) 2011-2013 Felix Gnass
   5  * Licensed under the MIT license
   6  */
   7 (function(root, factory) {
   8
   9   /* CommonJS */
  10   if (typeof exports == 'object')  module.exports = factory()
  11
  12   /* AMD module */
  13   else if (typeof define == 'function' && define.amd) define(factory)
  14
  15   /* Browser global */
  16   else root.Spinner = factory()
  17 }
  18 (this, function() {
  19   "use strict";
  20
  21   var prefixes = ['webkit', 'Moz', 'ms', 'O'] /* Vendor prefixes */
  22     , animations = {} /* Animation rules keyed by their name */
  23     , useCssAnimations /* Whether to use CSS animations or setTimeout */
  24
  25   /**
  26    * Utility function to create elements. If no tag name is given,
  27    * a DIV is created. Optionally properties can be passed.
  28    */
  29   function createEl(tag, prop) {
  30     var el = document.createElement(tag || 'div')
  31       , n
  32
  33     for(n in prop) el[n] = prop[n]
  34     return el
  35   }
  36
  37   /**
  38    * Appends children and returns the parent.
  39    */
  40   function ins(parent /* child1, child2, ...*/) {
  41     for (var i=1, n=arguments.length; i<n; i++)
  42       parent.appendChild(arguments[i])
  43
  44     return parent
  45   }
  46
  47   /**
  48    * Insert a new stylesheet to hold the @keyframe or VML rules.
  49    */
  50   var sheet = (function() {
  51     var el = createEl('style', {type : 'text/css'})
  52     ins(document.getElementsByTagName('head')[0], el)
  53     return el.sheet || el.styleSheet
  54   }())
  55
  56   /**
  57    * Creates an opacity keyframe animation rule and returns its name.
  58    * Since most mobile Webkits have timing issues with animation-delay,
  59    * we create separate rules for each line/segment.
  60    */
  61   function addAnimation(alpha, trail, i, lines) {
  62     var name = ['opacity', trail, ~~(alpha*100), i, lines].join('-')
  63       , start = 0.01 + i/lines * 100
  64       , z = Math.max(1 - (1-alpha) / trail * (100-start), alpha)
  65       , prefix = useCssAnimations.substring(0, useCssAnimations.indexOf('Animation')).toLowerCase()
  66       , pre = prefix && '-' + prefix + '-' || ''
  67
  68     if (!animations[name]) {
  69       sheet.insertRule(
  70         '@' + pre + 'keyframes ' + name + '{' +
  71         '0%{opacity:' + z + '}' +
  72         start + '%{opacity:' + alpha + '}' +
  73         (start+0.01) + '%{opacity:1}' +
  74         (start+trail) % 100 + '%{opacity:' + alpha + '}' +
  75         '100%{opacity:' + z + '}' +
  76         '}', sheet.cssRules.length)
  77
  78       animations[name] = 1
  79     }
  80
  81     return name
  82   }
  83
  84   /**
  85    * Tries various vendor prefixes and returns the first supported property.
  86    */
  87   function vendor(el, prop) {
  88     var s = el.style
  89       , pp
  90       , i
  91
  92     prop = prop.charAt(0).toUpperCase() + prop.slice(1)
  93     for(i=0; i<prefixes.length; i++) {
  94       pp = prefixes[i]+prop
  95       if(s[pp] !== undefined) return pp
  96     }
  97     if(s[prop] !== undefined) return prop
  98   }
  99
 100   /**
 101    * Sets multiple style properties at once.
 102    */
 103   function css(el, prop) {
 104     for (var n in prop)
 105       el.style[vendor(el, n)||n] = prop[n]
 106
 107     return el
 108   }
 109
 110   /**
 111    * Fills in default values.
 112    */
 113   function merge(obj) {
 114     for (var i=1; i < arguments.length; i++) {
 115       var def = arguments[i]
 116       for (var n in def)
 117         if (obj[n] === undefined) obj[n] = def[n]
 118     }
 119     return obj
 120   }
 121
 122   /**
 123    * Returns the absolute page-offset of the given element.
 124    */
 125   function pos(el) {
 126     var o = { x:el.offsetLeft, y:el.offsetTop }
 127     while((el = el.offsetParent))
 128       o.x+=el.offsetLeft, o.y+=el.offsetTop
 129
 130     return o
 131   }
 132
 133   /**
 134    * Returns the line color from the given string or array.
 135    */
 136   function getColor(color, idx) {
 137     return typeof color == 'string' ? color : color[idx % color.length]
 138   }
 139
 140   // Built-in defaults
 141
 142   var defaults = {
 143     lines: 12,            // The number of lines to draw
 144     length: 7,            // The length of each line
 145     width: 5,             // The line thickness
 146     radius: 10,           // The radius of the inner circle
 147     rotate: 0,            // Rotation offset
 148     corners: 1,           // Roundness (0..1)
 149     color: '#000',        // #rgb or #rrggbb
 150     direction: 1,         // 1: clockwise, -1: counterclockwise
 151     speed: 1,             // Rounds per second
 152     trail: 100,           // Afterglow percentage
 153     opacity: 1/4,         // Opacity of the lines
 154     fps: 20,              // Frames per second when using setTimeout()
 155     zIndex: 2e9,          // Use a high z-index by default
 156     className: 'spinner', // CSS class to assign to the element
 157     top: 'auto',          // center vertically
 158     left: 'auto',         // center horizontally
 159     position: 'relative'  // element position
 160   }
 161
 162   /** The constructor */
 163   function Spinner(o) {
 164     if (typeof this == 'undefined') return new Spinner(o)
 165     this.opts = merge(o || {}, Spinner.defaults, defaults)
 166   }
 167
 168   // Global defaults that override the built-ins:
 169   Spinner.defaults = {}
 170
 171   merge(Spinner.prototype, {
 172
 173     /**
 174      * Adds the spinner to the given target element. If this instance is already
 175      * spinning, it is automatically removed from its previous target b calling
 176      * stop() internally.
 177      */
 178     spin: function(target) {
 179       this.stop()
 180
 181       var self = this
 182         , o = self.opts
 183         , el = self.el = css(createEl(0, {className: o.className}), {position: o.position, width: 0, zIndex: o.zIndex})
 184         , mid = o.radius+o.length+o.width
 185         , ep // element position
 186         , tp // target position
 187
 188       if (target) {
 189         target.insertBefore(el, target.firstChild||null)
 190         tp = pos(target)
 191         ep = pos(el)
 192         css(el, {
 193           left: (o.left == 'auto' ? tp.x-ep.x + (target.offsetWidth >> 1) : parseInt(o.left, 10) + mid) + 'px',
 194           top: (o.top == 'auto' ? tp.y-ep.y + (target.offsetHeight >> 1) : parseInt(o.top, 10) + mid)  + 'px'
 195         })
 196       }
 197
 198       el.setAttribute('role', 'progressbar')
 199       self.lines(el, self.opts)
 200
 201       if (!useCssAnimations) {
 202         // No CSS animation support, use setTimeout() instead
 203         var i = 0
 204           , start = (o.lines - 1) * (1 - o.direction) / 2
 205           , alpha
 206           , fps = o.fps
 207           , f = fps/o.speed
 208           , ostep = (1-o.opacity) / (f*o.trail / 100)
 209           , astep = f/o.lines
 210
 211         ;(function anim() {
 212           i++;
 213           for (var j = 0; j < o.lines; j++) {
 214             alpha = Math.max(1 - (i + (o.lines - j) * astep) % f * ostep, o.opacity)
 215
 216             self.opacity(el, j * o.direction + start, alpha, o)
 217           }
 218           self.timeout = self.el && setTimeout(anim, ~~(1000/fps))
 219         })()
 220       }
 221       return self
 222     },
 223
 224     /**
 225      * Stops and removes the Spinner.
 226      */
 227     stop: function() {
 228       var el = this.el
 229       if (el) {
 230         clearTimeout(this.timeout)
 231         if (el.parentNode) el.parentNode.removeChild(el)
 232         this.el = undefined
 233       }
 234       return this
 235     },
 236
 237     /**
 238      * Internal method that draws the individual lines. Will be overwritten
 239      * in VML fallback mode below.
 240      */
 241     lines: function(el, o) {
 242       var i = 0
 243         , start = (o.lines - 1) * (1 - o.direction) / 2
 244         , seg
 245
 246       function fill(color, shadow) {
 247         return css(createEl(), {
 248           position: 'absolute',
 249           width: (o.length+o.width) + 'px',
 250           height: o.width + 'px',
 251           background: color,
 252           boxShadow: shadow,
 253           transformOrigin: 'left',
 254           transform: 'rotate(' + ~~(360/o.lines*i+o.rotate) + 'deg) translate(' + o.radius+'px' +',0)',
 255           borderRadius: (o.corners * o.width>>1) + 'px'
 256         })
 257       }
 258
 259       for (; i < o.lines; i++) {
 260         seg = css(createEl(), {
 261           position: 'absolute',
 262           top: 1+~(o.width/2) + 'px',
 263           transform: o.hwaccel ? 'translate3d(0,0,0)' : '',
 264           opacity: o.opacity,
 265           animation: useCssAnimations && addAnimation(o.opacity, o.trail, start + i * o.direction, o.lines) + ' ' + 1/o.speed + 's linear infinite'
 266         })
 267
 268         if (o.shadow) ins(seg, css(fill('#000', '0 0 4px ' + '#000'), {top: 2+'px'}))
 269         ins(el, ins(seg, fill(getColor(o.color, i), '0 0 1px rgba(0,0,0,.1)')))
 270       }
 271       return el
 272     },
 273
 274     /**
 275      * Internal method that adjusts the opacity of a single line.
 276      * Will be overwritten in VML fallback mode below.
 277      */
 278     opacity: function(el, i, val) {
 279       if (i < el.childNodes.length) el.childNodes[i].style.opacity = val
 280     }
 281
 282   })
 283
 284
 285   function initVML() {
 286
 287     /* Utility function to create a VML tag */
 288     function vml(tag, attr) {
 289       return createEl('<' + tag + ' xmlns="urn:schemas-microsoft.com:vml" class="spin-vml">', attr)
 290     }
 291
 292     // No CSS transforms but VML support, add a CSS rule for VML elements:
 293     sheet.addRule('.spin-vml', 'behavior:url(#default#VML)')
 294
 295     Spinner.prototype.lines = function(el, o) {
 296       var r = o.length+o.width
 297         , s = 2*r
 298
 299       function grp() {
 300         return css(
 301           vml('group', {
 302             coordsize: s + ' ' + s,
 303             coordorigin: -r + ' ' + -r
 304           }),
 305           { width: s, height: s }
 306         )
 307       }
 308
 309       var margin = -(o.width+o.length)*2 + 'px'
 310         , g = css(grp(), {position: 'absolute', top: margin, left: margin})
 311         , i
 312
 313       function seg(i, dx, filter) {
 314         ins(g,
 315           ins(css(grp(), {rotation: 360 / o.lines * i + 'deg', left: ~~dx}),
 316             ins(css(vml('roundrect', {arcsize: o.corners}), {
 317                 width: r,
 318                 height: o.width,
 319                 left: o.radius,
 320                 top: -o.width>>1,
 321                 filter: filter
 322               }),
 323               vml('fill', {color: getColor(o.color, i), opacity: o.opacity}),
 324               vml('stroke', {opacity: 0}) // transparent stroke to fix color bleeding upon opacity change
 325             )
 326           )
 327         )
 328       }
 329
 330       if (o.shadow)
 331         for (i = 1; i <= o.lines; i++)
 332           seg(i, -2, 'progid:DXImageTransform.Microsoft.Blur(pixelradius=2,makeshadow=1,shadowopacity=.3)')
 333
 334       for (i = 1; i <= o.lines; i++) seg(i)
 335       return ins(el, g)
 336     }
 337
 338     Spinner.prototype.opacity = function(el, i, val, o) {
 339       var c = el.firstChild
 340       o = o.shadow && o.lines || 0
 341       if (c && i+o < c.childNodes.length) {
 342         c = c.childNodes[i+o]; c = c && c.firstChild; c = c && c.firstChild
 343         if (c) c.opacity = val
 344       }
 345     }
 346   }
 347
 348   var probe = css(createEl('group'), {behavior: 'url(#default#VML)'})
 349
 350   if (!vendor(probe, 'transform') && probe.adj) initVML()
 351   else useCssAnimations = vendor(probe, 'animation')
 352
 353   return Spinner
 354
 355 }));