tests/plotters.html

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   5     <title>Plotters demo</title>
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  13       body {
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  16       div.chart {
  17         width: 640px;
  18         height: 320px;
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  22   <body>
  23     <p>This page demonstrates how to build custom plotters with dygraphs.
  24     The <a href="http://dygraphs.com/options.html#plotter">plotter</a> option
  25     allows you to write your own drawing logic. This can be used to achieve
  26     powerful customization. View source to see how the examples work.</p>
  27
  28     <h2>Bar Chart</h2>
  29     <p>Here a specialized <a
  30     href="http://dygraphs.com/options.html#plotter">plotter</a> is used to draw
  31     a bar plot rather than a line plot:</p>
  32     <div id="demodiv" class=chart></div>
  33
  34     <h2>Candle Chart</h2>
  35     <p>Here a specialized <a
  36     href="http://dygraphs.com/options.html#plotter">plotter</a> is used to
  37     combined four series into a unified "Candle" plot:</p>
  38     <div id="candlechart" class=chart></div>
  39
  40     <h2>Bar &amp; Line Chart</h2>
  41     <p>The <a href="http://dygraphs.com/options.html#plotter">plotter</a>
  42     option may be set on a per-series basis to create mixed charts:</p>
  43     <div id="barlinechart" class="chart"></div>
  44
  45     <h2>Multi-column Bar Chart</h2>
  46     <div id="multibar" class="chart"></div>
  47
  48     <h2>Mixed Error Bars and Lines</h2>
  49     <p>You can tweak the standard plotters list to achieve effects which would
  50     be difficult otherwise, e.g. drawing series with only confidence intervals
  51     and showing error bars only for some series.</p>
  52     <div id="mixed-error" class="chart"></div>
  53
  54     <script type="text/javascript">
  55
  56       // This function draws bars for a single series. See
  57       // multiColumnBarPlotter below for a plotter which can draw multi-series
  58       // bar charts.
  59       function barChartPlotter(e) {
  60         var ctx = e.drawingContext;
  61         var points = e.points;
  62         var y_bottom = e.dygraph.toDomYCoord(0);
  63
  64         // The RGBColor class is provided by rgbcolor.js, which is
  65         // packed in with dygraphs.
  66         var color = new RGBColor(e.color);
  67         color.r = Math.floor((255 + color.r) / 2);
  68         color.g = Math.floor((255 + color.g) / 2);
  69         color.b = Math.floor((255 + color.b) / 2);
  70         ctx.fillStyle = color.toRGB();
  71
  72         // Find the minimum separation between x-values.
  73         // This determines the bar width.
  74         var min_sep = Infinity;
  75         for (var i = 1; i < points.length; i++) {
  76           var sep = points[i].canvasx - points[i - 1].canvasx;
  77           if (sep < min_sep) min_sep = sep;
  78         }
  79         var bar_width = Math.floor(2.0 / 3 * min_sep);
  80
  81         // Do the actual plotting.
  82         for (var i = 0; i < points.length; i++) {
  83           var p = points[i];
  84           var center_x = p.canvasx;
  85
  86           ctx.fillRect(center_x - bar_width / 2, p.canvasy,
  87               bar_width, y_bottom - p.canvasy);
  88
  89           ctx.strokeRect(center_x - bar_width / 2, p.canvasy,
  90               bar_width, y_bottom - p.canvasy);
  91         }
  92       }
  93
  94       g = new Dygraph(
  95               document.getElementById("demodiv"),
  96               "Date,Widgets Sold\n" +
  97               "2012/07/21,10\n" +
  98               "2012/07/22,12\n" +
  99               "2012/07/23,9\n"  +
 100               "2012/07/24,16\n" +
 101               "2012/07/25,10\n",
 102               {
 103                 legend: 'always',
 104                 title: 'Daily Widget Sales',
 105                 includeZero: true,
 106                 dateWindow: [ Date.parse("2012/07/20"), Date.parse("2012/07/26") ],
 107                 animatedZooms: true,
 108                 drawXGrid: false,
 109                 plotter: barChartPlotter
 110               }
 111           );
 112
 113       // The Candle chart plotter is adapted from code written by
 114       // Zhenlei Cai (jpenguin@gmail.com)
 115       // https://github.com/danvk/dygraphs/pull/141/files
 116
 117       var BAR_WIDTH = 8;
 118       function candlePlotter(e) {
 119         // This is the officially endorsed way to plot all the series at once.
 120         if (e.seriesIndex !== 0) return;
 121
 122         var setCount = e.seriesCount;
 123         if (setCount != 4) {
 124           throw "Exactly 4 prices each point must be provided for candle chart (open close high low)";
 125         }
 126
 127         var prices = [];
 128         var price;
 129         var sets = e.allSeriesPoints;
 130         for (var p = 0 ; p < sets[0].length; p++) {
 131           price = {
 132             open : sets[0][p].yval,
 133             close : sets[1][p].yval,
 134             high : sets[2][p].yval,
 135             low : sets[3][p].yval,
 136             openY : sets[0][p].y,
 137             closeY : sets[1][p].y,
 138             highY : sets[2][p].y,
 139             lowY : sets[3][p].y
 140           };
 141           prices.push(price);
 142         }
 143
 144         var area = e.plotArea;
 145         var ctx = e.drawingContext;
 146         ctx.strokeStyle = '#202020';
 147         ctx.lineWidth = 0.6;
 148
 149         for (p = 0 ; p < prices.length; p++) {
 150           ctx.beginPath();
 151
 152           price = prices[p];
 153           var topY = area.h * price.highY + area.y;
 154           var bottomY = area.h * price.lowY + area.y;
 155           var centerX = area.x + sets[0][p].x * area.w;
 156           ctx.moveTo(centerX, topY);
 157           ctx.lineTo(centerX, bottomY);
 158           ctx.closePath();
 159           ctx.stroke();
 160           var bodyY;
 161           if (price.open > price.close) {
 162             ctx.fillStyle ='rgba(244,44,44,1.0)';
 163             bodyY = area.h * price.openY + area.y;
 164           }
 165           else {
 166             ctx.fillStyle ='rgba(44,244,44,1.0)';
 167             bodyY = area.h * price.closeY  + area.y;
 168           }
 169           var bodyHeight = area.h * Math.abs(price.openY - price.closeY);
 170           ctx.fillRect(centerX - BAR_WIDTH / 2, bodyY, BAR_WIDTH,  bodyHeight);
 171         }
 172
 173       }
 174
 175 var candleData = "Date,Open,Close,High,Low\n" +
 176   "2011-12-06,392.54,390.95,394.63,389.38\n" +
 177   "2011-12-07,389.93,389.09,390.94,386.76\n" +
 178   "2011-12-08,391.45,390.66,395.50,390.23\n" +
 179   "2011-12-09,392.85,393.62,394.04,391.03\n" +
 180   "2011-12-12,391.68,391.84,393.90,389.45\n" +
 181   "2011-12-13,393.00,388.81,395.40,387.10\n" +
 182   "2011-12-14,386.70,380.19,387.38,377.68\n" +
 183   "2011-12-15,383.33,378.94,383.74,378.31\n" +
 184   "2011-12-16,380.36,381.02,384.15,379.57\n" +
 185   "2011-12-19,382.47,382.21,384.85,380.48\n" +
 186   "2011-12-20,387.76,395.95,396.10,387.26\n" +
 187   "2011-12-21,396.69,396.45,397.30,392.01\n" +
 188   "2011-12-22,397.00,398.55,399.13,396.10\n" +
 189   "2011-12-23,399.69,403.33,403.59,399.49\n" +
 190   "2011-12-27,403.10,406.53,409.09,403.02\n" +
 191   "2011-12-28,406.89,402.64,408.25,401.34\n" +
 192   "2011-12-29,403.40,405.12,405.65,400.51\n" +
 193   "2011-12-30,403.51,405.00,406.28,403.49\n" +
 194   "2012-01-03,409.50,411.23,412.50,409.00\n" +
 195   "2012-01-04,410.21,413.44,414.68,409.28\n" +
 196   "2012-01-05,414.95,418.03,418.55,412.67\n" +
 197   "2012-01-06,419.77,422.40,422.75,419.22\n" +
 198   "2012-01-09,425.52,421.73,427.75,421.35\n" +
 199   "2012-01-10,425.91,423.24,426.00,421.50\n" +
 200   "2012-01-11,422.59,422.55,422.85,419.31\n" +
 201   "2012-01-12,422.41,421.39,422.90,418.75\n" +
 202   "2012-01-13,419.53,419.81,420.45,418.66\n" +
 203   "2012-01-17,424.20,424.70,425.99,422.96\n" +
 204   "2012-01-18,426.87,429.11,429.47,426.30\n" +
 205   "2012-01-19,430.03,427.75,431.37,426.51\n" +
 206   "2012-01-20,427.49,420.30,427.50,419.75\n" +
 207   "2012-01-23,422.67,427.41,428.45,422.30\n" +
 208   "2012-01-24,425.10,420.41,425.10,419.55\n" +
 209   "2012-01-25,454.26,446.66,454.45,443.73\n" +
 210   "2012-01-26,448.45,444.63,448.79,443.14\n" +
 211   "2012-01-27,444.37,447.28,448.48,443.77\n" +
 212   "2012-01-30,445.71,453.01,453.90,445.39\n" +
 213   "2012-01-31,455.85,456.48,458.24,453.07\n" +
 214   "2012-02-01,458.49,456.19,458.99,455.55\n" +
 215   "2012-02-02,455.90,455.12,457.17,453.98\n" +
 216   "2012-02-03,457.30,459.68,460.00,455.56\n" +
 217   "2012-02-06,458.38,463.97,464.98,458.20\n" +
 218   "2012-02-07,465.25,468.83,469.75,464.58\n" +
 219   "2012-02-08,470.50,476.68,476.79,469.70\n" +
 220   "2012-02-09,480.95,493.17,496.75,480.56\n" +
 221   "2012-02-10,491.17,493.42,497.62,488.55\n" +
 222   "2012-02-13,499.74,502.60,503.83,497.09\n" +
 223   "2012-02-14,504.70,509.46,509.56,502.00\n" ;
 224
 225     g2 = new Dygraph(
 226             document.getElementById("candlechart"),
 227             candleData,
 228             {
 229               plotter: candlePlotter
 230             });
 231
 232
 233     // Bar and Line chart
 234     var short_data = data_nolabel();
 235     short_data = short_data.split('\n').slice(0, 20).join('\n');
 236
 237     g3 = new Dygraph(
 238             document.getElementById("barlinechart"),
 239             short_data,
 240             {
 241               labels: ['Date', 'A', 'B'],
 242               includeZero: true,
 243               "A": {
 244                 strokeWidth: 2
 245               },
 246               "B": {
 247                 plotter: barChartPlotter
 248               }
 249             });
 250
 251
 252     // Multiple column bar chart
 253     function multiColumnBarPlotter(e) {
 254       // We need to handle all the series simultaneously.
 255       if (e.seriesIndex !== 0) return;
 256
 257       var g = e.dygraph;
 258       var ctx = e.drawingContext;
 259       var sets = e.allSeriesPoints;
 260       var y_bottom = e.dygraph.toDomYCoord(0);
 261
 262       // Find the minimum separation between x-values.
 263       // This determines the bar width.
 264       var min_sep = Infinity;
 265       for (var j = 0; j < sets.length; j++) {
 266         var points = sets[j];
 267         for (var i = 1; i < points.length; i++) {
 268           var sep = points[i].canvasx - points[i - 1].canvasx;
 269           if (sep < min_sep) min_sep = sep;
 270         }
 271       }
 272       var bar_width = Math.floor(2.0 / 3 * min_sep);
 273
 274       var fillColors = [];
 275       var strokeColors = g.getColors();
 276       for (var i = 0; i < strokeColors.length; i++) {
 277         var color = new RGBColor(strokeColors[i]);
 278         color.r = Math.floor((255 + color.r) / 2);
 279         color.g = Math.floor((255 + color.g) / 2);
 280         color.b = Math.floor((255 + color.b) / 2);
 281         fillColors.push(color.toRGB());
 282       }
 283
 284       for (var j = 0; j < sets.length; j++) {
 285         ctx.fillStyle = fillColors[j];
 286         ctx.strokeStyle = strokeColors[j];
 287         for (var i = 0; i < sets[j].length; i++) {
 288           var p = sets[j][i];
 289           var center_x = p.canvasx;
 290           var x_left = center_x - (bar_width / 2) * (1 - j/(sets.length-1));
 291
 292           ctx.fillRect(x_left, p.canvasy,
 293               bar_width/sets.length, y_bottom - p.canvasy);
 294
 295           ctx.strokeRect(x_left, p.canvasy,
 296               bar_width/sets.length, y_bottom - p.canvasy);
 297         }
 298       }
 299     }
 300
 301     g4 = new Dygraph(
 302             document.getElementById("multibar"),
 303             short_data,
 304             {
 305               includeZero: true,
 306               plotter: multiColumnBarPlotter
 307             });
 308
 309     // Mixed Error Bars and Lines
 310     g5 = new Dygraph(
 311             document.getElementById("mixed-error"),
 312             NoisyData(),
 313             {
 314               errorBars: true,
 315               'A': {
 316                 plotter: Dygraph.Plotters.errorPlotter
 317               },
 318               'B': {
 319                 plotter: Dygraph.Plotters.linePlotter,
 320                 strokePattern: Dygraph.DASHED_LINE
 321               }
 322             });
 323
 324     </script>
 325 </body>
 326 </html>