root / hci / trunk / eneraptor-web-app / web-app / js / flot / examples / tracking.html @ 11
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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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