tests/plotters.html

   1 <!DOCTYPE html>
   2 <html>
   3   <head>
   4     <title>Plotters demo</title>
   5     <script type="text/javascript" src="../dygraph-dev.js"></script>
   6
   7     <script type="text/javascript" src="data.js"></script>
   8     <style type="text/css">
   9       body {
  10         max-width: 750px;
  11       }
  12       div.chart {
  13         width: 640px;
  14         height: 320px;
  15       }
  16     </style>
  17   </head>
  18   <body>
  19     <p>This page demonstrates how to build custom plotters with dygraphs.
  20     The <a href="http://dygraphs.com/options.html#plotter">plotter</a> option
  21     allows you to write your own drawing logic. This can be used to achieve
  22     powerful customization. View source to see how the examples work.</p>
  23
  24     <h2>Bar Chart</h2>
  25     <p>Here a specialized <a
  26     href="http://dygraphs.com/options.html#plotter">plotter</a> is used to draw
  27     a bar plot rather than a line plot:</p>
  28     <div id="demodiv" class=chart></div>
  29
  30     <h2>Candle Chart</h2>
  31     <p>Here a specialized <a
  32     href="http://dygraphs.com/options.html#plotter">plotter</a> is used to
  33     combined four series into a unified "Candle" plot:</p>
  34     <div id="candlechart" class=chart></div>
  35
  36     <h2>Bar &amp; Line Chart</h2>
  37     <p>The <a href="http://dygraphs.com/options.html#plotter">plotter</a>
  38     option may be set on a per-series basis to create mixed charts:</p>
  39     <div id="barlinechart" class="chart"></div>
  40
  41     <h2>Multi-column Bar Chart</h2>
  42     <div id="multibar" class="chart"></div>
  43
  44     <h2>Mixed Error Bars and Lines</h2>
  45     <p>You can tweak the standard plotters list to achieve effects which would
  46     be difficult otherwise, e.g. drawing series with only confidence intervals
  47     and showing error bars only for some series.</p>
  48     <div id="mixed-error" class="chart"></div>
  49
  50     <h2>Smooth Lines</h2>
  51     <p>See the <a href="smooth-plots.html">smooth-plots demo</a> for an example of a custom plotter which connects points using bezier curves instead of straight lines.</p>
  52
  53     <script type="text/javascript">
  54       // Darken a color
  55       function darkenColor(colorStr) {
  56         // Defined in dygraph-utils.js
  57         var color = Dygraph.toRGB_(colorStr);
  58         color.r = Math.floor((255 + color.r) / 2);
  59         color.g = Math.floor((255 + color.g) / 2);
  60         color.b = Math.floor((255 + color.b) / 2);
  61         return 'rgb(' + color.r + ',' + color.g + ',' + color.b + ')';
  62       }
  63
  64       // This function draws bars for a single series. See
  65       // multiColumnBarPlotter below for a plotter which can draw multi-series
  66       // bar charts.
  67       function barChartPlotter(e) {
  68         var ctx = e.drawingContext;
  69         var points = e.points;
  70         var y_bottom = e.dygraph.toDomYCoord(0);
  71
  72         ctx.fillStyle = darkenColor(e.color);
  73
  74         // Find the minimum separation between x-values.
  75         // This determines the bar width.
  76         var min_sep = Infinity;
  77         for (var i = 1; i < points.length; i++) {
  78           var sep = points[i].canvasx - points[i - 1].canvasx;
  79           if (sep < min_sep) min_sep = sep;
  80         }
  81         var bar_width = Math.floor(2.0 / 3 * min_sep);
  82
  83         // Do the actual plotting.
  84         for (var i = 0; i < points.length; i++) {
  85           var p = points[i];
  86           var center_x = p.canvasx;
  87
  88           ctx.fillRect(center_x - bar_width / 2, p.canvasy,
  89               bar_width, y_bottom - p.canvasy);
  90
  91           ctx.strokeRect(center_x - bar_width / 2, p.canvasy,
  92               bar_width, y_bottom - p.canvasy);
  93         }
  94       }
  95
  96       g = new Dygraph(
  97               document.getElementById("demodiv"),
  98               "Date,Widgets Sold\n" +
  99               "2012/07/21,10\n" +
 100               "2012/07/22,12\n" +
 101               "2012/07/23,9\n"  +
 102               "2012/07/24,16\n" +
 103               "2012/07/25,10\n",
 104               {
 105                 legend: 'always',
 106                 title: 'Daily Widget Sales',
 107                 includeZero: true,
 108                 dateWindow: [ Date.parse("2012/07/20"), Date.parse("2012/07/26") ],
 109                 animatedZooms: true,
 110                 drawXGrid: false,
 111                 plotter: barChartPlotter
 112               }
 113           );
 114
 115       // The Candle chart plotter is adapted from code written by
 116       // Zhenlei Cai (jpenguin@gmail.com)
 117       // https://github.com/danvk/dygraphs/pull/141/files
 118
 119       var BAR_WIDTH = 8;
 120       function candlePlotter(e) {
 121         // This is the officially endorsed way to plot all the series at once.
 122         if (e.seriesIndex !== 0) return;
 123
 124         var setCount = e.seriesCount;
 125         if (setCount != 4) {
 126           throw "Exactly 4 prices each point must be provided for candle chart (open close high low)";
 127         }
 128
 129         var prices = [];
 130         var price;
 131         var sets = e.allSeriesPoints;
 132         for (var p = 0 ; p < sets[0].length; p++) {
 133           price = {
 134             open : sets[0][p].yval,
 135             close : sets[1][p].yval,
 136             high : sets[2][p].yval,
 137             low : sets[3][p].yval,
 138             openY : sets[0][p].y,
 139             closeY : sets[1][p].y,
 140             highY : sets[2][p].y,
 141             lowY : sets[3][p].y
 142           };
 143           prices.push(price);
 144         }
 145
 146         var area = e.plotArea;
 147         var ctx = e.drawingContext;
 148         ctx.strokeStyle = '#202020';
 149         ctx.lineWidth = 0.6;
 150
 151         for (p = 0 ; p < prices.length; p++) {
 152           ctx.beginPath();
 153
 154           price = prices[p];
 155           var topY = area.h * price.highY + area.y;
 156           var bottomY = area.h * price.lowY + area.y;
 157           var centerX = area.x + sets[0][p].x * area.w;
 158           ctx.moveTo(centerX, topY);
 159           ctx.lineTo(centerX, bottomY);
 160           ctx.closePath();
 161           ctx.stroke();
 162           var bodyY;
 163           if (price.open > price.close) {
 164             ctx.fillStyle ='rgba(244,44,44,1.0)';
 165             bodyY = area.h * price.openY + area.y;
 166           }
 167           else {
 168             ctx.fillStyle ='rgba(44,244,44,1.0)';
 169             bodyY = area.h * price.closeY  + area.y;
 170           }
 171           var bodyHeight = area.h * Math.abs(price.openY - price.closeY);
 172           ctx.fillRect(centerX - BAR_WIDTH / 2, bodyY, BAR_WIDTH,  bodyHeight);
 173         }
 174
 175       }
 176
 177 var candleData = "Date,Open,Close,High,Low\n" +
 178   "2011-12-06,392.54,390.95,394.63,389.38\n" +
 179   "2011-12-07,389.93,389.09,390.94,386.76\n" +
 180   "2011-12-08,391.45,390.66,395.50,390.23\n" +
 181   "2011-12-09,392.85,393.62,394.04,391.03\n" +
 182   "2011-12-12,391.68,391.84,393.90,389.45\n" +
 183   "2011-12-13,393.00,388.81,395.40,387.10\n" +
 184   "2011-12-14,386.70,380.19,387.38,377.68\n" +
 185   "2011-12-15,383.33,378.94,383.74,378.31\n" +
 186   "2011-12-16,380.36,381.02,384.15,379.57\n" +
 187   "2011-12-19,382.47,382.21,384.85,380.48\n" +
 188   "2011-12-20,387.76,395.95,396.10,387.26\n" +
 189   "2011-12-21,396.69,396.45,397.30,392.01\n" +
 190   "2011-12-22,397.00,398.55,399.13,396.10\n" +
 191   "2011-12-23,399.69,403.33,403.59,399.49\n" +
 192   "2011-12-27,403.10,406.53,409.09,403.02\n" +
 193   "2011-12-28,406.89,402.64,408.25,401.34\n" +
 194   "2011-12-29,403.40,405.12,405.65,400.51\n" +
 195   "2011-12-30,403.51,405.00,406.28,403.49\n" +
 196   "2012-01-03,409.50,411.23,412.50,409.00\n" +
 197   "2012-01-04,410.21,413.44,414.68,409.28\n" +
 198   "2012-01-05,414.95,418.03,418.55,412.67\n" +
 199   "2012-01-06,419.77,422.40,422.75,419.22\n" +
 200   "2012-01-09,425.52,421.73,427.75,421.35\n" +
 201   "2012-01-10,425.91,423.24,426.00,421.50\n" +
 202   "2012-01-11,422.59,422.55,422.85,419.31\n" +
 203   "2012-01-12,422.41,421.39,422.90,418.75\n" +
 204   "2012-01-13,419.53,419.81,420.45,418.66\n" +
 205   "2012-01-17,424.20,424.70,425.99,422.96\n" +
 206   "2012-01-18,426.87,429.11,429.47,426.30\n" +
 207   "2012-01-19,430.03,427.75,431.37,426.51\n" +
 208   "2012-01-20,427.49,420.30,427.50,419.75\n" +
 209   "2012-01-23,422.67,427.41,428.45,422.30\n" +
 210   "2012-01-24,425.10,420.41,425.10,419.55\n" +
 211   "2012-01-25,454.26,446.66,454.45,443.73\n" +
 212   "2012-01-26,448.45,444.63,448.79,443.14\n" +
 213   "2012-01-27,444.37,447.28,448.48,443.77\n" +
 214   "2012-01-30,445.71,453.01,453.90,445.39\n" +
 215   "2012-01-31,455.85,456.48,458.24,453.07\n" +
 216   "2012-02-01,458.49,456.19,458.99,455.55\n" +
 217   "2012-02-02,455.90,455.12,457.17,453.98\n" +
 218   "2012-02-03,457.30,459.68,460.00,455.56\n" +
 219   "2012-02-06,458.38,463.97,464.98,458.20\n" +
 220   "2012-02-07,465.25,468.83,469.75,464.58\n" +
 221   "2012-02-08,470.50,476.68,476.79,469.70\n" +
 222   "2012-02-09,480.95,493.17,496.75,480.56\n" +
 223   "2012-02-10,491.17,493.42,497.62,488.55\n" +
 224   "2012-02-13,499.74,502.60,503.83,497.09\n" +
 225   "2012-02-14,504.70,509.46,509.56,502.00\n" ;
 226
 227     g2 = new Dygraph(
 228             document.getElementById("candlechart"),
 229             candleData,
 230             {
 231               plotter: candlePlotter
 232             });
 233
 234
 235     // Bar and Line chart
 236     var short_data = data_nolabel();
 237     short_data = short_data.split('\n').slice(0, 20).join('\n');
 238
 239     g3 = new Dygraph(
 240             document.getElementById("barlinechart"),
 241             short_data,
 242             {
 243               labels: ['Date', 'A', 'B'],
 244               includeZero: true,
 245               series: {
 246                 "A": {
 247                   strokeWidth: 2
 248                 },
 249                 "B": {
 250                   plotter: barChartPlotter
 251                 }
 252               }
 253             });
 254
 255
 256     // Multiple column bar chart
 257     function multiColumnBarPlotter(e) {
 258       // We need to handle all the series simultaneously.
 259       if (e.seriesIndex !== 0) return;
 260
 261       var g = e.dygraph;
 262       var ctx = e.drawingContext;
 263       var sets = e.allSeriesPoints;
 264       var y_bottom = e.dygraph.toDomYCoord(0);
 265
 266       // Find the minimum separation between x-values.
 267       // This determines the bar width.
 268       var min_sep = Infinity;
 269       for (var j = 0; j < sets.length; j++) {
 270         var points = sets[j];
 271         for (var i = 1; i < points.length; i++) {
 272           var sep = points[i].canvasx - points[i - 1].canvasx;
 273           if (sep < min_sep) min_sep = sep;
 274         }
 275       }
 276       var bar_width = Math.floor(2.0 / 3 * min_sep);
 277
 278       var fillColors = [];
 279       var strokeColors = g.getColors();
 280       for (var i = 0; i < strokeColors.length; i++) {
 281         fillColors.push(darkenColor(strokeColors[i]));
 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               series: {
 316                 'A': {
 317                   plotter: Dygraph.Plotters.errorPlotter
 318                 },
 319                 'B': {
 320                   plotter: Dygraph.Plotters.linePlotter,
 321                   strokePattern: Dygraph.DASHED_LINE
 322                 }
 323               }
 324             });
 325
 326     </script>
 327 </body>
 328 </html>