| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135 | <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"><html><head>	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">	<title>Flot Examples: Tracking</title>	<link href="../examples.css" rel="stylesheet" type="text/css">	<!--[if lte IE 8]><script language="javascript" type="text/javascript" src="../../excanvas.min.js"></script><![endif]-->	<script language="javascript" type="text/javascript" src="../../jquery.js"></script>	<script language="javascript" type="text/javascript" src="../../jquery.flot.js"></script>	<script language="javascript" type="text/javascript" src="../../jquery.flot.crosshair.js"></script>	<script type="text/javascript">	$(function() {		var sin = [], cos = [];		for (var i = 0; i < 14; i += 0.1) {			sin.push([i, Math.sin(i)]);			cos.push([i, Math.cos(i)]);		}		plot = $.plot("#placeholder", [			{ data: sin, label: "sin(x) = -0.00"},			{ data: cos, label: "cos(x) = -0.00" }		], {			series: {				lines: {					show: true				}			},			crosshair: {				mode: "x"			},			grid: {				hoverable: true,				autoHighlight: false			},			yaxis: {				min: -1.2,				max: 1.2			}		});		var legends = $("#placeholder .legendLabel");		legends.each(function () {			// fix the widths so they don't jump around			$(this).css('width', $(this).width());		});		var updateLegendTimeout = null;		var latestPosition = null;		function updateLegend() {			updateLegendTimeout = null;			var pos = latestPosition;			var axes = plot.getAxes();			if (pos.x < axes.xaxis.min || pos.x > axes.xaxis.max ||				pos.y < axes.yaxis.min || pos.y > axes.yaxis.max) {				return;			}			var i, j, dataset = plot.getData();			for (i = 0; i < dataset.length; ++i) {				var series = dataset[i];				// Find the nearest points, x-wise				for (j = 0; j < series.data.length; ++j) {					if (series.data[j][0] > pos.x) {						break;					}				}				// Now Interpolate				var y,					p1 = series.data[j - 1],					p2 = series.data[j];				if (p1 == null) {					y = p2[1];				} else if (p2 == null) {					y = p1[1];				} else {					y = p1[1] + (p2[1] - p1[1]) * (pos.x - p1[0]) / (p2[0] - p1[0]);				}				legends.eq(i).text(series.label.replace(/=.*/, "= " + y.toFixed(2)));			}		}		$("#placeholder").bind("plothover",  function (event, pos, item) {			latestPosition = pos;			if (!updateLegendTimeout) {				updateLegendTimeout = setTimeout(updateLegend, 50);			}		});		// Add the Flot version string to the footer		$("#footer").prepend("Flot " + $.plot.version + " – ");	});	</script></head><body>	<div id="header">		<h2>Tracking</h2>	</div>	<div id="content">		<div class="demo-container">			<div id="placeholder" class="demo-placeholder"></div>		</div>		<p>You can add crosshairs that'll track the mouse position, either on both axes or as here on only one.</p>		<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>		<p id="hoverdata"></p>	</div>	<div id="footer">		Copyright © 2007 - 2014 IOLA and Ole Laursen	</div></body></html>
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