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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
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<html> |
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<head> |
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> |
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<title>Flot Examples</title> |
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<link href="layout.css" rel="stylesheet" type="text/css"></link> |
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<!--[if IE]><script language="javascript" type="text/javascript" src="../excanvas.min.js"></script><![endif]--> |
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<script language="javascript" type="text/javascript" src="../jquery.js"></script> |
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<script language="javascript" type="text/javascript" src="../jquery.flot.js"></script> |
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<script language="javascript" type="text/javascript" src="../jquery.flot.crosshair.js"></script> |
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</head> |
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<body> |
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<h1>Flot Examples</h1> |
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<div id="placeholder" style="width:600px;height:300px"></div> |
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<p>You can add crosshairs that'll track the mouse position, either |
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on both axes or as here on only one.</p> |
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<p>If you combine it with listening on hover events, you can use |
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it to track the intersection on the curves by interpolating |
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the data points (look at the legend).</p> |
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<p id="hoverdata"></p> |
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<script id="source" language="javascript" type="text/javascript"> |
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var plot; |
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$(function () { |
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var sin = [], cos = []; |
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for (var i = 0; i < 14; i += 0.1) { |
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sin.push([i, Math.sin(i)]); |
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cos.push([i, Math.cos(i)]); |
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} |
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plot = $.plot($("#placeholder"), |
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[ { data: sin, label: "sin(x) = -0.00"}, |
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{ data: cos, label: "cos(x) = -0.00" } ], { |
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series: { |
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lines: { show: true } |
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}, |
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crosshair: { mode: "x" }, |
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grid: { hoverable: true, autoHighlight: false }, |
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yaxis: { min: -1.2, max: 1.2 } |
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}); |
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var legends = $("#placeholder .legendLabel"); |
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legends.each(function () { |
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// fix the widths so they don't jump around |
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$(this).css('width', $(this).width()); |
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}); |
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var updateLegendTimeout = null; |
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var latestPosition = null; |
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function updateLegend() { |
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updateLegendTimeout = null; |
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var pos = latestPosition; |
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var axes = plot.getAxes(); |
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if (pos.x < axes.xaxis.min || pos.x > axes.xaxis.max || |
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pos.y < axes.yaxis.min || pos.y > axes.yaxis.max) |
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return; |
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var i, j, dataset = plot.getData(); |
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for (i = 0; i < dataset.length; ++i) { |
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var series = dataset[i]; |
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// find the nearest points, x-wise |
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for (j = 0; j < series.data.length; ++j) |
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if (series.data[j][0] > pos.x) |
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break; |
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// now interpolate |
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var y, p1 = series.data[j - 1], p2 = series.data[j]; |
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if (p1 == null) |
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y = p2[1]; |
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else if (p2 == null) |
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y = p1[1]; |
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else |
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y = p1[1] + (p2[1] - p1[1]) * (pos.x - p1[0]) / (p2[0] - p1[0]); |
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legends.eq(i).text(series.label.replace(/=.*/, "= " + y.toFixed(2))); |
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} |
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} |
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$("#placeholder").bind("plothover", function (event, pos, item) { |
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latestPosition = pos; |
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if (!updateLegendTimeout) |
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updateLegendTimeout = setTimeout(updateLegend, 50); |
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}); |
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}); |
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</script> |
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</body> |
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</html> |
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