diff options
| author | Frank Wuerthwein <fkw@ucsd.edu> | 2009-03-14 20:01:55 -0400 |
|---|---|---|
| committer | Frank Wuerthwein <fkw@ucsd.edu> | 2009-03-14 20:01:55 -0400 |
| commit | 1fd4de1b25398954e9ab43e54d0d0fdf1b5cfce0 (patch) | |
| tree | 57e8b2919f9ea6a66f339433e5dab41fbdedc86c /examples/tracking.html | |
| parent | 7385ff9506ea6db4c07150ee1b56e436cf384918 (diff) | |
flot-0.6pre@147
Diffstat (limited to 'examples/tracking.html')
| -rw-r--r-- | examples/tracking.html | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/examples/tracking.html b/examples/tracking.html new file mode 100644 index 0000000..722f960 --- /dev/null +++ b/examples/tracking.html @@ -0,0 +1,90 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> + <head> + <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> + <title>Flot Examples</title> + <link href="layout.css" rel="stylesheet" type="text/css"></link> + <!--[if IE]><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> + </head> + <body> + <h1>Flot Examples</h1> + + <div id="placeholder" style="width:600px;height:300px"></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.</p> + + <p id="hoverdata"></p> + +<script id="source" language="javascript" 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)]); + } + + var plot = $.plot($("#placeholder"), + [ { data: sin, label: "sin(x) = -0.00"}, { data: cos, label: "cos(x) = -0.00" } ], + { 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); + }); +}); +</script> + + </body> +</html> |