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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 + " – "); }); </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 - 2013 IOLA and Ole Laursen </div> </body> </html>