tests/drawing.html

   1 <!DOCTYPE html>
   2 <html>
   3   <head>
   4     <title>Dygraphs Drawing Demo</title>
   5     <!--
   6     For production (minified) code, use:
   7     <script type="text/javascript" src="dygraph-combined.js"></script>
   8     -->
   9     <script type="text/javascript" src="../dygraph-dev.js"></script>
  10
  11     <script>
  12     var start_date = new Date("2002/12/29").getTime();
  13     var end_date = new Date().getTime();
  14     data = [];
  15     for (var d = start_date; d < end_date; d += 604800 * 1000) {
  16       var millis = d + 2 * 3600 * 1000;
  17       var date = new Date(millis);
  18       var yyyy = date.getFullYear(),
  19           mm = date.getMonth(),
  20           dd = date.getDate();
  21       data.push( [ new Date(Date.UTC(yyyy, mm, dd)), 50 ]);
  22     }
  23     </script>
  24
  25     <style>
  26     #tool_zoom {
  27       background: url('drawing/tool-palette.png');
  28       background-position: 0px 0px;
  29       width: 32px;
  30       height: 33px;
  31       margin-left: 50px;
  32       display: inline-block;
  33     }
  34     #tool_pencil {
  35       background: url('drawing/tool-palette.png');
  36       background-position: -32px 0px;
  37       width: 32px;
  38       height: 33px;
  39       display: inline-block;
  40     }
  41     #tool_eraser {
  42       background: url('drawing/tool-palette.png');
  43       background-position: -64px 0px;
  44       width: 33px;
  45       height: 33px;
  46       display: inline-block;
  47     }
  48     #toolbar {
  49       display: inline-block;
  50     }
  51     </style>
  52 </head>
  53 <body>
  54   <h2>Time Series Drawing Demo</h2>
  55   <div id='toolbar'>
  56     <div id="tool_zoom" onClick='change_tool(this)'></div><div id="tool_pencil" onClick='change_tool(this)'></div><div id="tool_eraser" onClick='change_tool(this)'></div>
  57   </div>
  58   <div id="draw_div" style="width: 800px; height: 400px;"></div>
  59
  60   <script type="text/javascript">
  61     var isDrawing = false;
  62     var lastDrawRow = null, lastDrawValue = null;
  63     var tool = 'pencil';
  64     var valueRange = [0, 100];
  65
  66     function setPoint(event, g, context) {
  67       var pos = Dygraph.findPos(g.graphDiv);
  68       var canvasx = Dygraph.pageX(event) - pos.x;
  69       var canvasy = Dygraph.pageY(event) - pos.y;
  70       var xy = g.toDataCoords(canvasx, canvasy);
  71       var x = xy[0], value = xy[1];
  72       var rows = g.numRows();
  73       var closest_row = -1;
  74       var smallest_diff = -1;
  75       // TODO(danvk): binary search
  76       for (var row = 0; row < rows; row++) {
  77         var date = g.getValue(row, 0);  // millis
  78         var diff = Math.abs(date - x);
  79         if (smallest_diff < 0 || diff < smallest_diff) {
  80           smallest_diff = diff;
  81           closest_row = row;
  82         }
  83       }
  84
  85       if (closest_row != -1) {
  86         if (lastDrawRow === null) {
  87           lastDrawRow = closest_row;
  88           lastDrawValue = value;
  89         }
  90         var coeff = (value - lastDrawValue) / (closest_row - lastDrawRow);
  91         if (closest_row == lastDrawRow) coeff = 0.0;
  92         var minRow = Math.min(lastDrawRow, closest_row);
  93         var maxRow = Math.max(lastDrawRow, closest_row);
  94         for (var row = minRow; row <= maxRow; row++) {
  95           if (tool == 'pencil') {
  96             var val = lastDrawValue + coeff * (row - lastDrawRow);
  97             val = Math.max(valueRange[0], Math.min(val, valueRange[1]));
  98             data[row][1] = val;
  99             if (val == null || isNaN(val)) console.log(val);
 100           } else if (tool == 'eraser') {
 101             data[row][1] = null;
 102           }
 103         }
 104         lastDrawRow = closest_row;
 105         lastDrawValue = value;
 106         g.updateOptions({ file: data });
 107         g.setSelection(closest_row);  // prevents the dot from being finnicky.
 108       }
 109     }
 110
 111     function finishDraw() {
 112       isDrawing = false;
 113       lastDrawRow = null;
 114       lastDrawValue = null;
 115     }
 116
 117     function change_tool(tool_div) {
 118       var ids = ['tool_zoom', 'tool_pencil', 'tool_eraser'];
 119       for (var i = 0; i < ids.length; i++) {
 120         var div = document.getElementById(ids[i]);
 121         if (div == tool_div) {
 122           div.style.backgroundPosition = -(i * 32) + 'px -32px';
 123         } else {
 124           div.style.backgroundPosition = -(i * 32) + 'px 0px';
 125         }
 126       }
 127       tool = tool_div.id.replace('tool_', '');
 128
 129       var dg_div = document.getElementById("draw_div");
 130       if (tool == 'pencil') {
 131         dg_div.style.cursor = 'url(drawing/cursor-pencil.png) 2 30, auto';
 132       } else if (tool == 'eraser') {
 133         dg_div.style.cursor = 'url(drawing/cursor-eraser.png) 10 30, auto';
 134       } else if (tool == 'zoom') {
 135         dg_div.style.cursor = 'crosshair';
 136       }
 137     }
 138     change_tool(document.getElementById("tool_pencil"));
 139
 140     g = new Dygraph(document.getElementById("draw_div"), data,
 141         {
 142           valueRange: valueRange,
 143           labels: [ 'Date', 'Value' ],
 144           labelsUTC: true,
 145           interactionModel: {
 146             mousedown: function (event, g, context) {
 147               if (tool == 'zoom') {
 148                 Dygraph.defaultInteractionModel.mousedown(event, g, context);
 149               } else {
 150                 // prevents mouse drags from selecting page text.
 151                 if (event.preventDefault) {
 152                   event.preventDefault();  // Firefox, Chrome, etc.
 153                 } else {
 154                   event.returnValue = false;  // IE
 155                   event.cancelBubble = true;
 156                 }
 157                 isDrawing = true;
 158                 setPoint(event, g, context);
 159               }
 160             },
 161             mousemove: function (event, g, context) {
 162               if (tool == 'zoom') {
 163               } else {
 164                 if (!isDrawing) return;
 165                 setPoint(event, g, context);
 166               }
 167             },
 168             mouseup: function(event, g, context) {
 169               if (tool == 'zoom') {
 170               } else {
 171                 finishDraw();
 172               }
 173             },
 174             mouseout: function(event, g, context) {
 175               if (tool == 'zoom') {
 176               }
 177             },
 178             dblclick: function(event, g, context) {
 179               Dygraph.defaultInteractionModel.dblclick(event, g, context);
 180             },
 181             mousewheel: function(event, g, context) {
 182               var normal = event.detail ? event.detail * -1 : event.wheelDelta / 40;
 183               var percentage = normal / 50;
 184               var axis = g.xAxisRange();
 185               var xOffset = g.toDomCoords(axis[0], null)[0];
 186               var x = event.offsetX - xOffset;
 187               var w = g.toDomCoords(axis[1], null)[0] - xOffset;
 188               var xPct = w == 0 ? 0 : (x / w);
 189
 190               var delta = axis[1] - axis[0];
 191               var increment = delta * percentage;
 192               var foo = [increment * xPct, increment * (1 - xPct)];
 193               var dateWindow = [ axis[0] + foo[0], axis[1] - foo[1] ];
 194
 195               g.updateOptions({
 196                 dateWindow: dateWindow
 197               });
 198               Dygraph.cancelEvent(event);
 199             }
 200           },
 201           strokeWidth: 1.5,
 202           gridLineColor: 'rgb(196, 196, 196)',
 203           axes: {
 204             y: {
 205               drawAxis: false,
 206               drawGrid: false
 207             }
 208           }
 209         });
 210         window.onmouseup = finishDraw;
 211   </script>
 212
 213   <p style='font-size: 10pt'>Toolbar/cursor icons are CC-licensed from <a
 214   href="http://www.fatcow.com/free-icons">FatCow</a>.</p>
 215 </body>
 216 </html>