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   1  /**
   2   * jqPlot
   3   * Pure JavaScript plotting plugin using jQuery
   4   *
   5   * Version: 1.0.2
   6   * Revision: 1108
   7   *
   8   * Copyright (c) 2009-2011 Chris Leonello
   9   * jqPlot is currently available for use in all personal or commercial projects 
  10   * under both the MIT (http://www.opensource.org/licenses/mit-license.php) and GPL 
  11   * version 2.0 (http://www.gnu.org/licenses/gpl-2.0.html) licenses. This means that you can 
  12   * choose the license that best suits your project and use it accordingly. 
  13   *
  14   * Although not required, the author would appreciate an email letting him 
  15   * know of any substantial use of jqPlot.  You can reach the author at: 
  16   * chris at jqplot dot com or see http://www.jqplot.com/info.php .
  17   *
  18   * If you are feeling kind and generous, consider supporting the project by
  19   * making a donation at: http://www.jqplot.com/donate.php .
  20   *
  21   * sprintf functions contained in jqplot.sprintf.js by Ash Searle:
  22   *
  23   *     version 2007.04.27
  24   *     author Ash Searle
  25   *     http://hexmen.com/blog/2007/03/printf-sprintf/
  26   *     http://hexmen.com/js/sprintf.js
  27   *     The author (Ash Searle) has placed this code in the public domain:
  28   *     "This code is unrestricted: you are free to use it however you like."
  29   * 
  30   */
  31  (function($) {
  32      /**
  33       * Class: $.jqplot.MeterGaugeRenderer
  34       * Plugin renderer to draw a meter gauge chart.
  35       * 
  36       * Data consists of a single series with 1 data point to position the gauge needle.
  37       * 
  38       * To use this renderer, you need to include the 
  39       * meter gauge renderer plugin, for example:
  40       * 
  41       * > <script type="text/javascript" src="plugins/jqplot.meterGaugeRenderer.js"></script>
  42       * 
  43       * Properties described here are passed into the $.jqplot function
  44       * as options on the series renderer.  For example:
  45       * 
  46       * > plot0 = $.jqplot('chart0',[[18]],{
  47       * >     title: 'Network Speed',
  48       * >     seriesDefaults: {
  49       * >         renderer: $.jqplot.MeterGaugeRenderer,
  50       * >         rendererOptions: {
  51       * >             label: 'MB/s'
  52       * >         }
  53       * >     }
  54       * > });
  55       * 
  56       * A meterGauge plot does not support events.
  57       */
  58      $.jqplot.MeterGaugeRenderer = function(){
  59          $.jqplot.LineRenderer.call(this);
  60      };
  61      
  62      $.jqplot.MeterGaugeRenderer.prototype = new $.jqplot.LineRenderer();
  63      $.jqplot.MeterGaugeRenderer.prototype.constructor = $.jqplot.MeterGaugeRenderer;
  64      
  65      // called with scope of a series
  66      $.jqplot.MeterGaugeRenderer.prototype.init = function(options) {
  67          // Group: Properties
  68          //
  69          // prop: diameter
  70          // Outer diameter of the meterGauge, auto computed by default
  71          this.diameter = null;
  72          // prop: padding
  73          // padding between the meterGauge and plot edges, auto
  74          // calculated by default.
  75          this.padding = null;
  76          // prop: shadowOffset
  77          // offset of the shadow from the gauge ring and offset of 
  78          // each succesive stroke of the shadow from the last.
  79          this.shadowOffset = 2;
  80          // prop: shadowAlpha
  81          // transparency of the shadow (0 = transparent, 1 = opaque)
  82          this.shadowAlpha = 0.07;
  83          // prop: shadowDepth
  84          // number of strokes to apply to the shadow, 
  85          // each stroke offset shadowOffset from the last.
  86          this.shadowDepth = 4;
  87          // prop: background
  88          // background color of the inside of the gauge.
  89          this.background = "#efefef";
  90          // prop: ringColor
  91          // color of the outer ring, hub, and needle of the gauge.
  92          this.ringColor = "#BBC6D0";
  93          // needle color not implemented yet.
  94          this.needleColor = "#C3D3E5";
  95          // prop: tickColor
  96          // color of the tick marks around the gauge.
  97          this.tickColor = "989898";
  98          // prop: ringWidth
  99          // width of the ring around the gauge.  Auto computed by default.
 100          this.ringWidth = null;
 101          // prop: min
 102          // Minimum value on the gauge.  Auto computed by default
 103          this.min;
 104          // prop: max
 105          // Maximum value on the gauge. Auto computed by default
 106          this.max;
 107          // prop: ticks
 108          // Array of tick values. Auto computed by default.
 109          this.ticks = [];
 110          // prop: showTicks
 111          // true to show ticks around gauge.
 112          this.showTicks = true;
 113          // prop: showTickLabels
 114          // true to show tick labels next to ticks.
 115          this.showTickLabels = true;
 116          // prop: label
 117          // A gauge label like 'kph' or 'Volts'
 118          this.label = null;
 119          // prop: labelHeightAdjust
 120          // Number of Pixels to offset the label up (-) or down (+) from its default position.
 121          this.labelHeightAdjust = 0;
 122          // prop: labelPosition
 123          // Where to position the label, either 'inside' or 'bottom'.
 124          this.labelPosition = 'inside';
 125          // prop: intervals
 126          // Array of ranges to be drawn around the gauge.
 127          // Array of form:
 128          // > [value1, value2, ...]
 129          // indicating the values for the first, second, ... intervals.
 130          this.intervals = [];
 131          // prop: intervalColors
 132          // Array of colors to use for the intervals.
 133          this.intervalColors = [ "#4bb2c5", "#EAA228", "#c5b47f", "#579575", "#839557", "#958c12", "#953579", "#4b5de4", "#d8b83f", "#ff5800", "#0085cc", "#c747a3", "#cddf54", "#FBD178", "#26B4E3", "#bd70c7"];
 134          // prop: intervalInnerRadius
 135          // Radius of the inner circle of the interval ring.
 136          this.intervalInnerRadius =  null;
 137          // prop: intervalOuterRadius
 138          // Radius of the outer circle of the interval ring.
 139          this.intervalOuterRadius = null;
 140          this.tickRenderer = $.jqplot.MeterGaugeTickRenderer;
 141          // ticks spaced every 1, 2, 2.5, 5, 10, 20, .1, .2, .25, .5, etc.
 142          this.tickPositions = [1, 2, 2.5, 5, 10];
 143          // prop: tickSpacing
 144          // Degrees between ticks.  This is a target number, if 
 145          // incompatible span and ticks are supplied, a suitable
 146          // spacing close to this value will be computed.
 147          this.tickSpacing = 30;
 148          this.numberMinorTicks = null;
 149          // prop: hubRadius
 150          // Radius of the hub at the bottom center of gauge which the needle attaches to.
 151          // Auto computed by default
 152          this.hubRadius = null;
 153          // prop: tickPadding
 154          // padding of the tick marks to the outer ring and the tick labels to marks.
 155          // Auto computed by default.
 156          this.tickPadding = null;
 157          // prop: needleThickness
 158          // Maximum thickness the needle.  Auto computed by default.
 159          this.needleThickness = null;
 160          // prop: needlePad
 161          // Padding between needle and inner edge of the ring when the needle is at the min or max gauge value.
 162          this.needlePad = 6;
 163          // prop: pegNeedle
 164          // True will stop needle just below/above the  min/max values if data is below/above min/max,
 165          // as if the meter is "pegged".
 166          this.pegNeedle = true;
 167          this._type = 'meterGauge';
 168          
 169          $.extend(true, this, options);
 170          this.type = null;
 171          this.numberTicks = null;
 172          this.tickInterval = null;
 173          // span, the sweep (in degrees) from min to max.  This gauge is 
 174          // a semi-circle.
 175          this.span = 180;
 176          // get rid of this nonsense
 177          // this.innerSpan = this.span;
 178          if (this.type == 'circular') {
 179              this.semiCircular = false;
 180          }
 181          else if (this.type != 'circular') {
 182              this.semiCircular = true;
 183          }
 184          else {
 185              this.semiCircular = (this.span <= 180) ? true : false;
 186          }
 187          this._tickPoints = [];
 188          // reference to label element.
 189          this._labelElem = null;
 190          
 191          // start the gauge at the beginning of the span
 192          this.startAngle = (90 + (360 - this.span)/2) * Math.PI/180;
 193          this.endAngle = (90 - (360 - this.span)/2) * Math.PI/180;
 194          
 195          this.setmin = !!(this.min == null);
 196          this.setmax = !!(this.max == null);
 197          
 198          // if given intervals and is an array of values, create labels and colors.
 199          if (this.intervals.length) {
 200              if (this.intervals[0].length == null || this.intervals.length == 1) {
 201                  for (var i=0; i<this.intervals.length; i++) {
 202                      this.intervals[i] = [this.intervals[i], this.intervals[i], this.intervalColors[i]];
 203                  }
 204              }
 205              else if (this.intervals[0].length == 2) {
 206                  for (i=0; i<this.intervals.length; i++) {
 207                      this.intervals[i] = [this.intervals[i][0], this.intervals[i][1], this.intervalColors[i]];
 208                  }
 209              }
 210          }
 211          
 212          // compute min, max and ticks if not supplied:
 213          if (this.ticks.length) {
 214              if (this.ticks[0].length == null || this.ticks[0].length == 1) {
 215                  for (var i=0; i<this.ticks.length; i++) {
 216                      this.ticks[i] = [this.ticks[i], this.ticks[i]];
 217                  }
 218              }
 219              this.min = (this.min == null) ? this.ticks[0][0] : this.min;
 220              this.max = (this.max == null) ? this.ticks[this.ticks.length-1][0] : this.max;
 221              this.setmin = false;
 222              this.setmax = false;
 223              this.numberTicks = this.ticks.length;
 224              this.tickInterval = this.ticks[1][0] - this.ticks[0][0];
 225              this.tickFactor = Math.floor(parseFloat((Math.log(this.tickInterval)/Math.log(10)).toFixed(11)));
 226              // use the first interal to calculate minor ticks;
 227              this.numberMinorTicks = getnmt(this.tickPositions, this.tickInterval, this.tickFactor);
 228              if (!this.numberMinorTicks) {
 229                  this.numberMinorTicks = getnmt(this.tickPositions, this.tickInterval, this.tickFactor-1);
 230              }
 231              if (!this.numberMinorTicks) {
 232                  this.numberMinorTicks = 1;
 233              }
 234          }
 235          
 236          else if (this.intervals.length) {
 237              this.min = (this.min == null) ? 0 : this.min;
 238              this.setmin = false;
 239              if (this.max == null) {
 240                  if (this.intervals[this.intervals.length-1][0] >= this.data[0][1]) {
 241                      this.max = this.intervals[this.intervals.length-1][0];
 242                      this.setmax = false;
 243                  }
 244              }
 245              else {
 246                  this.setmax = false;
 247              }
 248          }
 249          
 250          else {
 251              // no ticks and no intervals supplied, put needle in middle
 252              this.min = (this.min == null) ? 0 : this.min;
 253              this.setmin = false;
 254              if (this.max == null) {
 255                  this.max = this.data[0][1] * 1.25;
 256                  this.setmax = true;
 257              }
 258              else {
 259                  this.setmax = false;
 260              }
 261          }
 262      };
 263      
 264      $.jqplot.MeterGaugeRenderer.prototype.setGridData = function(plot) {
 265          // set gridData property.  This will hold angle in radians of each data point.
 266          var stack = [];
 267          var td = [];
 268          var sa = this.startAngle;
 269          for (var i=0; i<this.data.length; i++){
 270              stack.push(this.data[i][1]);
 271              td.push([this.data[i][0]]);
 272              if (i>0) {
 273                  stack[i] += stack[i-1];
 274              }
 275          }
 276          var fact = Math.PI*2/stack[stack.length - 1];
 277          
 278          for (var i=0; i<stack.length; i++) {
 279              td[i][1] = stack[i] * fact;
 280          }
 281          this.gridData = td;
 282      };
 283      
 284      $.jqplot.MeterGaugeRenderer.prototype.makeGridData = function(data, plot) {
 285          var stack = [];
 286          var td = [];
 287          var sa = this.startAngle;
 288          for (var i=0; i<data.length; i++){
 289              stack.push(data[i][1]);
 290              td.push([data[i][0]]);
 291              if (i>0) {
 292                  stack[i] += stack[i-1];
 293              }
 294          }
 295          var fact = Math.PI*2/stack[stack.length - 1];
 296          
 297          for (var i=0; i<stack.length; i++) {
 298              td[i][1] = stack[i] * fact;
 299          }
 300          return td;
 301      };
 302  
 303          
 304      function getnmt(pos, interval, fact) {
 305          var temp;
 306          for (var i=pos.length-1; i>=0; i--) {
 307              temp = interval/(pos[i] * Math.pow(10, fact));
 308              if (temp == 4 || temp == 5) {
 309                  return temp - 1;
 310              }
 311          }
 312          return null;
 313      }
 314      
 315      // called with scope of series
 316      $.jqplot.MeterGaugeRenderer.prototype.draw = function (ctx, gd, options) {
 317          var i;
 318          var opts = (options != undefined) ? options : {};
 319          // offset and direction of offset due to legend placement
 320          var offx = 0;
 321          var offy = 0;
 322          var trans = 1;
 323          if (options.legendInfo && options.legendInfo.placement == 'inside') {
 324              var li = options.legendInfo;
 325              switch (li.location) {
 326                  case 'nw':
 327                      offx = li.width + li.xoffset;
 328                      break;
 329                  case 'w':
 330                      offx = li.width + li.xoffset;
 331                      break;
 332                  case 'sw':
 333                      offx = li.width + li.xoffset;
 334                      break;
 335                  case 'ne':
 336                      offx = li.width + li.xoffset;
 337                      trans = -1;
 338                      break;
 339                  case 'e':
 340                      offx = li.width + li.xoffset;
 341                      trans = -1;
 342                      break;
 343                  case 'se':
 344                      offx = li.width + li.xoffset;
 345                      trans = -1;
 346                      break;
 347                  case 'n':
 348                      offy = li.height + li.yoffset;
 349                      break;
 350                  case 's':
 351                      offy = li.height + li.yoffset;
 352                      trans = -1;
 353                      break;
 354                  default:
 355                      break;
 356              }
 357          }
 358          
 359          
 360              
 361          // pre-draw so can get it's dimensions.
 362          if (this.label) {
 363              this._labelElem = $('<div class="jqplot-meterGauge-label" style="position:absolute;">'+this.label+'</div>');
 364              this.canvas._elem.after(this._labelElem);
 365          }
 366          
 367          var shadow = (opts.shadow != undefined) ? opts.shadow : this.shadow;
 368          var showLine = (opts.showLine != undefined) ? opts.showLine : this.showLine;
 369          var fill = (opts.fill != undefined) ? opts.fill : this.fill;
 370          var cw = ctx.canvas.width;
 371          var ch = ctx.canvas.height;
 372          if (this.padding == null) {
 373              this.padding = Math.round(Math.min(cw, ch)/30);
 374          }
 375          var w = cw - offx - 2 * this.padding;
 376          var h = ch - offy - 2 * this.padding;
 377          if (this.labelPosition == 'bottom' && this.label) {
 378              h -= this._labelElem.outerHeight(true);
 379          }
 380          var mindim = Math.min(w,h);
 381          var d = mindim;
 382              
 383          if (!this.diameter) {
 384              if (this.semiCircular) {
 385                  if ( w >= 2*h) {
 386                      if (!this.ringWidth) {
 387                          this.ringWidth = 2*h/35;
 388                      }
 389                      this.needleThickness = this.needleThickness || 2+Math.pow(this.ringWidth, 0.8);
 390                      this.innerPad = this.ringWidth/2 + this.needleThickness/2 + this.needlePad;
 391                      this.diameter = 2 * (h - 2*this.innerPad);
 392                  }
 393                  else {
 394                      if (!this.ringWidth) {
 395                          this.ringWidth = w/35;
 396                      }
 397                      this.needleThickness = this.needleThickness || 2+Math.pow(this.ringWidth, 0.8);
 398                      this.innerPad = this.ringWidth/2 + this.needleThickness/2 + this.needlePad;
 399                      this.diameter = w - 2*this.innerPad - this.ringWidth - this.padding;
 400                  }
 401                  // center taking into account legend and over draw for gauge bottom below hub.
 402                  // this will be center of hub.
 403                  this._center = [(cw - trans * offx)/2 + trans * offx,  (ch + trans*offy - this.padding - this.ringWidth - this.innerPad)];
 404              }
 405              else {
 406                  if (!this.ringWidth) {
 407                      this.ringWidth = d/35;
 408                  }
 409                  this.needleThickness = this.needleThickness || 2+Math.pow(this.ringWidth, 0.8);
 410                  this.innerPad = 0;
 411                  this.diameter = d - this.ringWidth;
 412                  // center in middle of canvas taking into account legend.
 413                  // will be center of hub.
 414                  this._center = [(cw-trans*offx)/2 + trans * offx, (ch-trans*offy)/2 + trans * offy];
 415              }
 416          }
 417  
 418          
 419          if (this._labelElem && this.labelPosition == 'bottom') {
 420              this._center[1] -= this._labelElem.outerHeight(true);
 421          }
 422          
 423          this._radius = this.diameter/2;
 424          
 425          this.tickSpacing = 6000/this.diameter;
 426          
 427          if (!this.hubRadius) {
 428              this.hubRadius = this.diameter/18;
 429          }
 430          
 431          this.shadowOffset = 0.5 + this.ringWidth/9;
 432          this.shadowWidth = this.ringWidth*1;
 433          
 434          this.tickPadding = 3 + Math.pow(this.diameter/20, 0.7);
 435          this.tickOuterRadius = this._radius - this.ringWidth/2 - this.tickPadding;
 436          this.tickLength = (this.showTicks) ? this._radius/13 : 0;
 437          
 438          if (this.ticks.length == 0) {
 439              // no ticks, lets make some.
 440              var max = this.max,
 441                  min = this.min,
 442                  setmax = this.setmax,
 443                  setmin = this.setmin,
 444                  ti = (max - min) * this.tickSpacing / this.span;
 445              var tf = Math.floor(parseFloat((Math.log(ti)/Math.log(10)).toFixed(11)));
 446              var tp = (ti/Math.pow(10, tf));
 447              (tp > 2 && tp <= 2.5) ? tp = 2.5 : tp = Math.ceil(tp);
 448              var t = this.tickPositions;
 449              var tpindex, nt;
 450      
 451              for (i=0; i<t.length; i++) {
 452                  if (tp == t[i] || i && t[i-1] < tp && tp < t[i]) { 
 453                      ti = t[i]*Math.pow(10, tf);
 454                      tpindex = i;
 455                  }
 456              }
 457          
 458              for (i=0; i<t.length; i++) {
 459                  if (tp == t[i] || i && t[i-1] < tp && tp < t[i]) { 
 460                      ti = t[i]*Math.pow(10, tf);
 461                      nt = Math.ceil((max - min) / ti);
 462                  }
 463              }
 464          
 465              // both max and min are free
 466              if (setmax && setmin) {
 467                  var tmin = (min > 0) ? min - min % ti : min - min % ti - ti;
 468                  if (!this.forceZero) {
 469                      var diff = Math.min(min - tmin, 0.8*ti);
 470                      var ntp = Math.floor(diff/t[tpindex]);
 471                      if (ntp > 1) {
 472                          tmin = tmin + t[tpindex] * (ntp-1);
 473                          if (parseInt(tmin, 10) != tmin && parseInt(tmin-t[tpindex], 10) == tmin-t[tpindex]) {
 474                              tmin = tmin - t[tpindex];
 475                          }
 476                      }
 477                  }
 478                  if (min == tmin) {
 479                      min -= ti;
 480                  }
 481                  else {
 482                      // tmin should always be lower than dataMin
 483                      if (min - tmin > 0.23*ti) {
 484                          min = tmin;
 485                      }
 486                      else {
 487                          min = tmin -ti;
 488                          nt += 1;
 489                      }
 490                  }
 491                  nt += 1;
 492                  var tmax = min + (nt - 1) * ti;
 493                  if (max >= tmax) { 
 494                      tmax += ti;
 495                      nt += 1;
 496                  }
 497                  // now tmax should always be mroe than dataMax
 498                  if (tmax - max < 0.23*ti) { 
 499                      tmax += ti;
 500                      nt += 1;
 501                  }
 502                  this.max = max = tmax;
 503                  this.min = min;    
 504  
 505                  this.tickInterval = ti;
 506                  this.numberTicks = nt;
 507                  var it;
 508                  for (i=0; i<nt; i++) {
 509                      it = parseFloat((min+i*ti).toFixed(11));
 510                      this.ticks.push([it, it]);
 511                  }
 512                  this.max = this.ticks[nt-1][1];
 513              
 514                  this.tickFactor = tf;      
 515                  // determine number of minor ticks
 516  
 517                  this.numberMinorTicks = getnmt(this.tickPositions, this.tickInterval, this.tickFactor);     
 518          
 519                  if (!this.numberMinorTicks) {
 520                      this.numberMinorTicks = getnmt(this.tickPositions, this.tickInterval, this.tickFactor-1);
 521                  }
 522              }
 523              // max is free, min is fixed
 524              else if (setmax) {
 525                  var tmax = min + (nt - 1) * ti;
 526                  if (max >= tmax) {
 527                      max = tmax + ti;
 528                      nt += 1;
 529                  }
 530                  else {
 531                      max = tmax;
 532                  }
 533  
 534                  this.tickInterval = this.tickInterval || ti;
 535                  this.numberTicks = this.numberTicks || nt;
 536                  var it;
 537                  for (i=0; i<this.numberTicks; i++) {
 538                      it = parseFloat((min+i*this.tickInterval).toFixed(11));
 539                      this.ticks.push([it, it]);
 540                  }
 541                  this.max = this.ticks[this.numberTicks-1][1];
 542              
 543                  this.tickFactor = tf;
 544                  // determine number of minor ticks
 545                  this.numberMinorTicks = getnmt(this.tickPositions, this.tickInterval, this.tickFactor);
 546          
 547                  if (!this.numberMinorTicks) {
 548                      this.numberMinorTicks = getnmt(this.tickPositions, this.tickInterval, this.tickFactor-1);
 549                  }
 550              }
 551              
 552              // not setting max or min
 553              if (!setmax && !setmin) {
 554                  var range = this.max - this.min;
 555                  tf = Math.floor(parseFloat((Math.log(range)/Math.log(10)).toFixed(11))) - 1;
 556                  var nticks = [5,6,4,7,3,8,9,10,2], res, numticks, nonSigDigits=0, sigRange;
 557                  // check to see how many zeros are at the end of the range
 558                  if (range > 1) {
 559                      var rstr = String(range);
 560                      if (rstr.search(/\./) == -1) {
 561                           var pos = rstr.search(/0+$/);
 562                           nonSigDigits = (pos > 0) ? rstr.length - pos - 1 : 0;
 563                      }
 564                  }
 565                  sigRange = range/Math.pow(10, nonSigDigits);
 566                  for (i=0; i<nticks.length; i++) {
 567                      res = sigRange/(nticks[i]-1);
 568                      if (res == parseInt(res, 10)) {
 569                          this.numberTicks = nticks[i];
 570                          this.tickInterval = range/(this.numberTicks-1);
 571                          this.tickFactor = tf+1;
 572                          break;
 573                      }
 574                  }
 575                  var it;
 576                  for (i=0; i<this.numberTicks; i++) {
 577                      it = parseFloat((this.min+i*this.tickInterval).toFixed(11));
 578                      this.ticks.push([it, it]);
 579                  }
 580                  // determine number of minor ticks
 581                  this.numberMinorTicks = getnmt(this.tickPositions, this.tickInterval, this.tickFactor);
 582          
 583                  if (!this.numberMinorTicks) {
 584                      this.numberMinorTicks = getnmt(this.tickPositions, this.tickInterval, this.tickFactor-1);
 585                  }
 586                  
 587                  if (!this.numberMinorTicks) {
 588                      this.numberMinorTicks = 1;
 589                      var nums = [4, 5, 3, 6, 2];
 590                      for (i=0; i<5; i++) {
 591                          var temp = this.tickInterval/nums[i];
 592                          if (temp == parseInt(temp, 10)) {
 593                              this.numberMinorTicks = nums[i]-1;
 594                              break;
 595                          }
 596                      }
 597                  }
 598              }
 599          }
 600          
 601  
 602          var r = this._radius,
 603              sa = this.startAngle,
 604              ea = this.endAngle,       
 605              pi = Math.PI,
 606              hpi = Math.PI/2;
 607              
 608          if (this.semiCircular) {
 609              var overAngle = Math.atan(this.innerPad/r),
 610                  outersa = this.outerStartAngle = sa - overAngle,
 611                  outerea = this.outerEndAngle = ea + overAngle,
 612                  hubsa = this.hubStartAngle = sa - Math.atan(this.innerPad/this.hubRadius*2),
 613                  hubea = this.hubEndAngle = ea + Math.atan(this.innerPad/this.hubRadius*2);
 614  
 615              ctx.save();            
 616              
 617              ctx.translate(this._center[0], this._center[1]);
 618              ctx.lineJoin = "round";
 619              ctx.lineCap = "round";
 620              
 621              // draw the innerbackground
 622              ctx.save();
 623              ctx.beginPath();  
 624              ctx.fillStyle = this.background;
 625              ctx.arc(0, 0, r, outersa, outerea, false);
 626              ctx.closePath();
 627              ctx.fill();
 628              ctx.restore();
 629              
 630              // draw the shadow
 631              // the outer ring.
 632              var shadowColor = 'rgba(0,0,0,'+this.shadowAlpha+')';
 633              ctx.save();
 634              for (var i=0; i<this.shadowDepth; i++) {
 635                  ctx.translate(this.shadowOffset*Math.cos(this.shadowAngle/180*Math.PI), this.shadowOffset*Math.sin(this.shadowAngle/180*Math.PI));
 636                  ctx.beginPath();  
 637                  ctx.strokeStyle = shadowColor;
 638                  ctx.lineWidth = this.shadowWidth;
 639                  ctx.arc(0 ,0, r, outersa, outerea, false);
 640                  ctx.closePath();
 641                  ctx.stroke();
 642              }
 643              ctx.restore();
 644              
 645              // the inner hub.
 646              ctx.save();
 647              var tempd = parseInt((this.shadowDepth+1)/2, 10);
 648              for (var i=0; i<tempd; i++) {
 649                  ctx.translate(this.shadowOffset*Math.cos(this.shadowAngle/180*Math.PI), this.shadowOffset*Math.sin(this.shadowAngle/180*Math.PI));
 650                  ctx.beginPath();  
 651                  ctx.fillStyle = shadowColor;
 652                  ctx.arc(0 ,0, this.hubRadius, hubsa, hubea, false);
 653                  ctx.closePath();
 654                  ctx.fill();
 655              }
 656              ctx.restore();
 657              
 658              // draw the outer ring.
 659              ctx.save();
 660              ctx.beginPath();  
 661              ctx.strokeStyle = this.ringColor;
 662              ctx.lineWidth = this.ringWidth;
 663              ctx.arc(0 ,0, r, outersa, outerea, false);
 664              ctx.closePath();
 665              ctx.stroke();
 666              ctx.restore();
 667              
 668              // draw the hub
 669              
 670              ctx.save();
 671              ctx.beginPath();  
 672              ctx.fillStyle = this.ringColor;
 673              ctx.arc(0 ,0, this.hubRadius,hubsa, hubea, false);
 674              ctx.closePath();
 675              ctx.fill();
 676              ctx.restore();
 677              
 678              // draw the ticks
 679              if (this.showTicks) {
 680                  ctx.save();
 681                  var orad = this.tickOuterRadius,
 682                      tl = this.tickLength,
 683                      mtl = tl/2,
 684                      nmt = this.numberMinorTicks,
 685                      ts = this.span * Math.PI / 180 / (this.ticks.length-1),
 686                      mts = ts/(nmt + 1);
 687                  
 688                  for (i = 0; i<this.ticks.length; i++) {
 689                      ctx.beginPath();
 690                      ctx.lineWidth = 1.5 + this.diameter/360;
 691                      ctx.strokeStyle = this.ringColor;
 692                      var wps = ts*i+sa;
 693                      ctx.moveTo(-orad * Math.cos(ts*i+sa), orad * Math.sin(ts*i+sa));
 694                      ctx.lineTo(-(orad-tl) * Math.cos(ts*i+sa), (orad - tl) * Math.sin(ts*i+sa));
 695                      this._tickPoints.push([(orad-tl) * Math.cos(ts*i+sa) + this._center[0] + this.canvas._offsets.left, (orad - tl) * Math.sin(ts*i+sa) + this._center[1] + this.canvas._offsets.top, ts*i+sa]);
 696                      ctx.stroke();
 697                      ctx.lineWidth = 1.0 + this.diameter/440;
 698                      if (i<this.ticks.length-1) {
 699                          for (var j=1; j<=nmt; j++) {
 700                              ctx.beginPath();
 701                              ctx.moveTo(-orad * Math.cos(ts*i+mts*j+sa), orad * Math.sin(ts*i+mts*j+sa));
 702                              ctx.lineTo(-(orad-mtl) * Math.cos(ts*i+mts*j+sa), (orad-mtl) * Math.sin(ts*i+mts*j+sa));
 703                              ctx.stroke();
 704                          }   
 705                      }
 706                  }
 707                  ctx.restore();
 708              }
 709              
 710              // draw the tick labels
 711              if (this.showTickLabels) {
 712                  var elem, l, t, ew, eh, dim, maxdim=0;
 713                  var tp = this.tickPadding * (1 - 1/(this.diameter/80+1));
 714                  for (i=0; i<this.ticks.length; i++) {
 715                      elem = $('<div class="jqplot-meterGauge-tick" style="position:absolute;">'+this.ticks[i][1]+'</div>');
 716                      this.canvas._elem.after(elem);
 717                      ew = elem.outerWidth(true);
 718                      eh = elem.outerHeight(true);
 719                      l = this._tickPoints[i][0] - ew * (this._tickPoints[i][2]-Math.PI)/Math.PI - tp * Math.cos(this._tickPoints[i][2]);
 720                      t = this._tickPoints[i][1] - eh/2 + eh/2 * Math.pow(Math.abs((Math.sin(this._tickPoints[i][2]))), 0.5) + tp/3 * Math.pow(Math.abs((Math.sin(this._tickPoints[i][2]))), 0.5) ;
 721                      // t = this._tickPoints[i][1] - eh/2 - eh/2 * Math.sin(this._tickPoints[i][2]) - tp/2 * Math.sin(this._tickPoints[i][2]);
 722                      elem.css({left:l, top:t});
 723                      dim  = ew*Math.cos(this._tickPoints[i][2]) + eh*Math.sin(Math.PI/2+this._tickPoints[i][2]/2);
 724                      maxdim = (dim > maxdim) ? dim : maxdim;
 725                  }
 726              }
 727              
 728              // draw the gauge label
 729              if (this.label && this.labelPosition == 'inside') {
 730                  var l = this._center[0] + this.canvas._offsets.left;
 731                  var tp = this.tickPadding * (1 - 1/(this.diameter/80+1));
 732                  var t = 0.5*(this._center[1] + this.canvas._offsets.top - this.hubRadius) + 0.5*(this._center[1] + this.canvas._offsets.top - this.tickOuterRadius + this.tickLength + tp) + this.labelHeightAdjust;
 733                  // this._labelElem = $('<div class="jqplot-meterGauge-label" style="position:absolute;">'+this.label+'</div>');
 734                  // this.canvas._elem.after(this._labelElem);
 735                  l -= this._labelElem.outerWidth(true)/2;
 736                  t -= this._labelElem.outerHeight(true)/2;
 737                  this._labelElem.css({left:l, top:t});
 738              }
 739              
 740              else if (this.label && this.labelPosition == 'bottom') {
 741                  var l = this._center[0] + this.canvas._offsets.left - this._labelElem.outerWidth(true)/2;
 742                  var t = this._center[1] + this.canvas._offsets.top + this.innerPad + + this.ringWidth + this.padding + this.labelHeightAdjust;
 743                  this._labelElem.css({left:l, top:t});
 744                  
 745              }
 746              
 747              // draw the intervals
 748              
 749              ctx.save();
 750              var inner = this.intervalInnerRadius || this.hubRadius * 1.5;
 751              if (this.intervalOuterRadius == null) {
 752                  if (this.showTickLabels) {
 753                      var outer = (this.tickOuterRadius - this.tickLength - this.tickPadding - this.diameter/8);
 754                  }
 755                  else {
 756                      var outer = (this.tickOuterRadius - this.tickLength - this.diameter/16);
 757                  }
 758              }
 759              else {
 760                  var outer = this.intervalOuterRadius;
 761              }
 762              var range = this.max - this.min;
 763              var intrange = this.intervals[this.intervals.length-1] - this.min;
 764              var start, end, span = this.span*Math.PI/180;
 765              for (i=0; i<this.intervals.length; i++) {
 766                  start = (i == 0) ? sa : sa + (this.intervals[i-1][0] - this.min)*span/range;
 767                  if (start < 0) {
 768                      start = 0;
 769                  }
 770                  end = sa + (this.intervals[i][0] - this.min)*span/range;
 771                  if (end < 0) {
 772                      end = 0;
 773                  }
 774                  ctx.beginPath();
 775                  ctx.fillStyle = this.intervals[i][2];
 776                  ctx.arc(0, 0, inner, start, end, false);
 777                  ctx.lineTo(outer*Math.cos(end), outer*Math.sin(end));
 778                  ctx.arc(0, 0, outer, end, start, true);
 779                  ctx.lineTo(inner*Math.cos(start), inner*Math.sin(start));
 780                  ctx.closePath();
 781                  ctx.fill();
 782              }
 783              ctx.restore();
 784              
 785              // draw the needle
 786              var datapoint = this.data[0][1];
 787              var dataspan = this.max - this.min;
 788              if (this.pegNeedle) {
 789                  if (this.data[0][1] > this.max + dataspan*3/this.span) {
 790                      datapoint = this.max + dataspan*3/this.span;
 791                  }
 792                  if (this.data[0][1] < this.min - dataspan*3/this.span) {
 793                      datapoint = this.min - dataspan*3/this.span;
 794                  }
 795              }
 796              var dataang = (datapoint - this.min)/dataspan * this.span * Math.PI/180 + this.startAngle;
 797              
 798              
 799              ctx.save();
 800              ctx.beginPath();
 801              ctx.fillStyle = this.ringColor;
 802              ctx.strokeStyle = this.ringColor;
 803              this.needleLength = (this.tickOuterRadius - this.tickLength) * 0.85;
 804              this.needleThickness = (this.needleThickness < 2) ? 2 : this.needleThickness;
 805              var endwidth = this.needleThickness * 0.4;
 806  
 807              
 808              var dl = this.needleLength/10;
 809              var dt = (this.needleThickness - endwidth)/10;
 810              var templ;
 811              for (var i=0; i<10; i++) {
 812                  templ = this.needleThickness - i*dt;
 813                  ctx.moveTo(dl*i*Math.cos(dataang), dl*i*Math.sin(dataang));
 814                  ctx.lineWidth = templ;
 815                  ctx.lineTo(dl*(i+1)*Math.cos(dataang), dl*(i+1)*Math.sin(dataang));
 816                  ctx.stroke();
 817              }
 818              
 819              ctx.restore();
 820          }
 821          else {
 822              this._center = [(cw - trans * offx)/2 + trans * offx, (ch - trans*offy)/2 + trans * offy];
 823          }               
 824      };
 825      
 826      $.jqplot.MeterGaugeAxisRenderer = function() {
 827          $.jqplot.LinearAxisRenderer.call(this);
 828      };
 829      
 830      $.jqplot.MeterGaugeAxisRenderer.prototype = new $.jqplot.LinearAxisRenderer();
 831      $.jqplot.MeterGaugeAxisRenderer.prototype.constructor = $.jqplot.MeterGaugeAxisRenderer;
 832          
 833      
 834      // There are no traditional axes on a gauge chart.  We just need to provide
 835      // dummy objects with properties so the plot will render.
 836      // called with scope of axis object.
 837      $.jqplot.MeterGaugeAxisRenderer.prototype.init = function(options){
 838          //
 839          this.tickRenderer = $.jqplot.MeterGaugeTickRenderer;
 840          $.extend(true, this, options);
 841          // I don't think I'm going to need _dataBounds here.
 842          // have to go Axis scaling in a way to fit chart onto plot area
 843          // and provide u2p and p2u functionality for mouse cursor, etc.
 844          // for convienence set _dataBounds to 0 and 100 and
 845          // set min/max to 0 and 100.
 846          this._dataBounds = {min:0, max:100};
 847          this.min = 0;
 848          this.max = 100;
 849          this.showTicks = false;
 850          this.ticks = [];
 851          this.showMark = false;
 852          this.show = false; 
 853      };
 854      
 855      $.jqplot.MeterGaugeLegendRenderer = function(){
 856          $.jqplot.TableLegendRenderer.call(this);
 857      };
 858      
 859      $.jqplot.MeterGaugeLegendRenderer.prototype = new $.jqplot.TableLegendRenderer();
 860      $.jqplot.MeterGaugeLegendRenderer.prototype.constructor = $.jqplot.MeterGaugeLegendRenderer;
 861      
 862      /**
 863       * Class: $.jqplot.MeterGaugeLegendRenderer
 864       *Meter gauges don't typically have a legend, this overrides the default legend renderer.
 865       */
 866      $.jqplot.MeterGaugeLegendRenderer.prototype.init = function(options) {
 867          // Maximum number of rows in the legend.  0 or null for unlimited.
 868          this.numberRows = null;
 869          // Maximum number of columns in the legend.  0 or null for unlimited.
 870          this.numberColumns = null;
 871          $.extend(true, this, options);
 872      };
 873      
 874      // called with context of legend
 875      $.jqplot.MeterGaugeLegendRenderer.prototype.draw = function() {
 876          if (this.show) {
 877              var series = this._series;
 878              var ss = 'position:absolute;';
 879              ss += (this.background) ? 'background:'+this.background+';' : '';
 880              ss += (this.border) ? 'border:'+this.border+';' : '';
 881              ss += (this.fontSize) ? 'font-size:'+this.fontSize+';' : '';
 882              ss += (this.fontFamily) ? 'font-family:'+this.fontFamily+';' : '';
 883              ss += (this.textColor) ? 'color:'+this.textColor+';' : '';
 884              ss += (this.marginTop != null) ? 'margin-top:'+this.marginTop+';' : '';
 885              ss += (this.marginBottom != null) ? 'margin-bottom:'+this.marginBottom+';' : '';
 886              ss += (this.marginLeft != null) ? 'margin-left:'+this.marginLeft+';' : '';
 887              ss += (this.marginRight != null) ? 'margin-right:'+this.marginRight+';' : '';
 888              this._elem = $('<table class="jqplot-table-legend" style="'+ss+'"></table>');
 889              // MeterGauge charts legends don't go by number of series, but by number of data points
 890              // in the series.  Refactor things here for that.
 891              
 892              var pad = false, 
 893                  reverse = false,
 894                  nr, nc;
 895              var s = series[0];
 896              
 897              if (s.show) {
 898                  var pd = s.data;
 899                  if (this.numberRows) {
 900                      nr = this.numberRows;
 901                      if (!this.numberColumns){
 902                          nc = Math.ceil(pd.length/nr);
 903                      }
 904                      else{
 905                          nc = this.numberColumns;
 906                      }
 907                  }
 908                  else if (this.numberColumns) {
 909                      nc = this.numberColumns;
 910                      nr = Math.ceil(pd.length/this.numberColumns);
 911                  }
 912                  else {
 913                      nr = pd.length;
 914                      nc = 1;
 915                  }
 916                  
 917                  var i, j, tr, td1, td2, lt, rs, color;
 918                  var idx = 0;    
 919                  
 920                  for (i=0; i<nr; i++) {
 921                      if (reverse){
 922                          tr = $('<tr class="jqplot-table-legend"></tr>').prependTo(this._elem);
 923                      }
 924                      else{
 925                          tr = $('<tr class="jqplot-table-legend"></tr>').appendTo(this._elem);
 926                      }
 927                      for (j=0; j<nc; j++) {
 928                          if (idx < pd.length){
 929                              // debugger
 930                              lt = this.labels[idx] || pd[idx][0].toString();
 931                              color = s.color;
 932                              if (!reverse){
 933                                  if (i>0){
 934                                      pad = true;
 935                                  }
 936                                  else{
 937                                      pad = false;
 938                                  }
 939                              }
 940                              else{
 941                                  if (i == nr -1){
 942                                      pad = false;
 943                                  }
 944                                  else{
 945                                      pad = true;
 946                                  }
 947                              }
 948                              rs = (pad) ? this.rowSpacing : '0';
 949                  
 950                              td1 = $('<td class="jqplot-table-legend" style="text-align:center;padding-top:'+rs+';">'+
 951                                  '<div><div class="jqplot-table-legend-swatch" style="border-color:'+color+';"></div>'+
 952                                  '</div></td>');
 953                              td2 = $('<td class="jqplot-table-legend" style="padding-top:'+rs+';"></td>');
 954                              if (this.escapeHtml){
 955                                  td2.text(lt);
 956                              }
 957                              else {
 958                                  td2.html(lt);
 959                              }
 960                              if (reverse) {
 961                                  td2.prependTo(tr);
 962                                  td1.prependTo(tr);
 963                              }
 964                              else {
 965                                  td1.appendTo(tr);
 966                                  td2.appendTo(tr);
 967                              }
 968                              pad = true;
 969                          }
 970                          idx++;
 971                      }   
 972                  }
 973              }
 974          }
 975          return this._elem;                
 976      };
 977      
 978      
 979      // setup default renderers for axes and legend so user doesn't have to
 980      // called with scope of plot
 981      function preInit(target, data, options) {
 982          // debugger
 983          options = options || {};
 984          options.axesDefaults = options.axesDefaults || {};
 985          options.legend = options.legend || {};
 986          options.seriesDefaults = options.seriesDefaults || {};
 987          options.grid = options.grid || {};
 988             
 989          // only set these if there is a gauge series
 990          var setopts = false;
 991          if (options.seriesDefaults.renderer == $.jqplot.MeterGaugeRenderer) {
 992              setopts = true;
 993          }
 994          else if (options.series) {
 995              for (var i=0; i < options.series.length; i++) {
 996                  if (options.series[i].renderer == $.jqplot.MeterGaugeRenderer) {
 997                      setopts = true;
 998                  }
 999              }
1000          }
1001          
1002          if (setopts) {
1003              options.axesDefaults.renderer = $.jqplot.MeterGaugeAxisRenderer;
1004              options.legend.renderer = $.jqplot.MeterGaugeLegendRenderer;
1005              options.legend.preDraw = true;
1006              options.grid.background = options.grid.background || 'white';
1007              options.grid.drawGridlines = false;
1008              options.grid.borderWidth = (options.grid.borderWidth != null) ? options.grid.borderWidth : 0;
1009              options.grid.shadow = (options.grid.shadow != null) ? options.grid.shadow : false;
1010          }
1011      }
1012      
1013      // called with scope of plot
1014      function postParseOptions(options) {
1015          //
1016      }
1017      
1018      $.jqplot.preInitHooks.push(preInit);
1019      $.jqplot.postParseOptionsHooks.push(postParseOptions);
1020      
1021      $.jqplot.MeterGaugeTickRenderer = function() {
1022          $.jqplot.AxisTickRenderer.call(this);
1023      };
1024      
1025      $.jqplot.MeterGaugeTickRenderer.prototype = new $.jqplot.AxisTickRenderer();
1026      $.jqplot.MeterGaugeTickRenderer.prototype.constructor = $.jqplot.MeterGaugeTickRenderer;
1027      
1028  })(jQuery);
1029      
1030