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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">
+ <!--[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 + " &ndash; ");
+ });
+
+ </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 &copy; 2007 - 2013 IOLA and Ole Laursen
+ </div>
+
+</body>
+</html>