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<!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">
	
	<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 + " &ndash; ");
	});

</script>
</head>
<body>

<div id="header">
		<h2>Tracking</h2>
	</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>

</div>

</body>
</html>

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