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      1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
      2 <html>
      3 <head>
      4 	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
      5 	<title>Flot Examples: Tracking</title>
      6 	<link href="../examples.css" rel="stylesheet" type="text/css">
      7 	<!--[if lte IE 8]><script language="javascript" type="text/javascript" src="../../excanvas.min.js"></script><![endif]-->
      8 	<script language="javascript" type="text/javascript" src="../../jquery.js"></script>
      9 	<script language="javascript" type="text/javascript" src="../../jquery.flot.js"></script>
     10 	<script language="javascript" type="text/javascript" src="../../jquery.flot.crosshair.js"></script>
     11 	<script type="text/javascript">
     12 
     13 	$(function() {
     14 
     15 		var sin = [], cos = [];
     16 		for (var i = 0; i < 14; i += 0.1) {
     17 			sin.push([i, Math.sin(i)]);
     18 			cos.push([i, Math.cos(i)]);
     19 		}
     20 
     21 		plot = $.plot("#placeholder", [
     22 			{ data: sin, label: "sin(x) = -0.00"},
     23 			{ data: cos, label: "cos(x) = -0.00" }
     24 		], {
     25 			series: {
     26 				lines: {
     27 					show: true
     28 				}
     29 			},
     30 			crosshair: {
     31 				mode: "x"
     32 			},
     33 			grid: {
     34 				hoverable: true,
     35 				autoHighlight: false
     36 			},
     37 			yaxis: {
     38 				min: -1.2,
     39 				max: 1.2
     40 			}
     41 		});
     42 
     43 		var legends = $("#placeholder .legendLabel");
     44 
     45 		legends.each(function () {
     46 			// fix the widths so they don't jump around
     47 			$(this).css('width', $(this).width());
     48 		});
     49 
     50 		var updateLegendTimeout = null;
     51 		var latestPosition = null;
     52 
     53 		function updateLegend() {
     54 
     55 			updateLegendTimeout = null;
     56 
     57 			var pos = latestPosition;
     58 
     59 			var axes = plot.getAxes();
     60 			if (pos.x < axes.xaxis.min || pos.x > axes.xaxis.max ||
     61 				pos.y < axes.yaxis.min || pos.y > axes.yaxis.max) {
     62 				return;
     63 			}
     64 
     65 			var i, j, dataset = plot.getData();
     66 			for (i = 0; i < dataset.length; ++i) {
     67 
     68 				var series = dataset[i];
     69 
     70 				// Find the nearest points, x-wise
     71 
     72 				for (j = 0; j < series.data.length; ++j) {
     73 					if (series.data[j][0] > pos.x) {
     74 						break;
     75 					}
     76 				}
     77 
     78 				// Now Interpolate
     79 
     80 				var y,
     81 					p1 = series.data[j - 1],
     82 					p2 = series.data[j];
     83 
     84 				if (p1 == null) {
     85 					y = p2[1];
     86 				} else if (p2 == null) {
     87 					y = p1[1];
     88 				} else {
     89 					y = p1[1] + (p2[1] - p1[1]) * (pos.x - p1[0]) / (p2[0] - p1[0]);
     90 				}
     91 
     92 				legends.eq(i).text(series.label.replace(/=.*/, "= " + y.toFixed(2)));
     93 			}
     94 		}
     95 
     96 		$("#placeholder").bind("plothover",  function (event, pos, item) {
     97 			latestPosition = pos;
     98 			if (!updateLegendTimeout) {
     99 				updateLegendTimeout = setTimeout(updateLegend, 50);
    100 			}
    101 		});
    102 
    103 		// Add the Flot version string to the footer
    104 
    105 		$("#footer").prepend("Flot " + $.plot.version + " &ndash; ");
    106 	});
    107 
    108 	</script>
    109 </head>
    110 <body>
    111 
    112 	<div id="header">
    113 		<h2>Tracking</h2>
    114 	</div>
    115 
    116 	<div id="content">
    117 
    118 		<div class="demo-container">
    119 			<div id="placeholder" class="demo-placeholder"></div>
    120 		</div>
    121 
    122 		<p>You can add crosshairs that'll track the mouse position, either on both axes or as here on only one.</p>
    123 
    124 		<p>If you combine it with listening on hover events, you can use it to track the intersection on the curves by interpolating the data points (look at the legend).</p>
    125 
    126 		<p id="hoverdata"></p>
    127 
    128 	</div>
    129 
    130 	<div id="footer">
    131 		Copyright &copy; 2007 - 2013 IOLA and Ole Laursen
    132 	</div>
    133 
    134 </body>
    135 </html>