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| author | Igor Sfiligoi <isfiligoi@ucsd.edu> | 2011-03-22 07:30:12 -0400 |
|---|---|---|
| committer | Igor Sfiligoi <isfiligoi@ucsd.edu> | 2011-03-22 07:30:12 -0400 |
| commit | cb2e3d2743c0f88b430f14b7a396aa1a583dc978 (patch) | |
| tree | a01293736eef098deff6d1cc832dcba0731ebb3e /examples/realtime.html | |
| parent | af26aaa53d073a7b2d25caee93e1cb5ceb2e099c (diff) | |
flot-0.7
Diffstat (limited to 'examples/realtime.html')
| -rw-r--r-- | examples/realtime.html | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/examples/realtime.html b/examples/realtime.html new file mode 100644 index 0000000..3b427e1 --- /dev/null +++ b/examples/realtime.html @@ -0,0 +1,83 @@ +<!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"> + <!--[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> + </head> + <body> + <h1>Flot Examples</h1> + + <div id="placeholder" style="width:600px;height:300px;"></div> + + <p>You can update a chart periodically to get a real-time effect + by using a timer to insert the new data in the plot and redraw it.</p> + + <p>Time between updates: <input id="updateInterval" type="text" value="" style="text-align: right; width:5em"> milliseconds</p> + +<script type="text/javascript"> +$(function () { + // we use an inline data source in the example, usually data would + // be fetched from a server + var data = [], totalPoints = 300; + function getRandomData() { + if (data.length > 0) + data = data.slice(1); + + // do a random walk + while (data.length < totalPoints) { + var prev = data.length > 0 ? data[data.length - 1] : 50; + var y = prev + Math.random() * 10 - 5; + if (y < 0) + y = 0; + if (y > 100) + y = 100; + data.push(y); + } + + // zip the generated y values with the x values + var res = []; + for (var i = 0; i < data.length; ++i) + res.push([i, data[i]]) + return res; + } + + // setup control widget + var updateInterval = 30; + $("#updateInterval").val(updateInterval).change(function () { + var v = $(this).val(); + if (v && !isNaN(+v)) { + updateInterval = +v; + if (updateInterval < 1) + updateInterval = 1; + if (updateInterval > 2000) + updateInterval = 2000; + $(this).val("" + updateInterval); + } + }); + + // setup plot + var options = { + series: { shadowSize: 0 }, // drawing is faster without shadows + yaxis: { min: 0, max: 100 }, + xaxis: { show: false } + }; + var plot = $.plot($("#placeholder"), [ getRandomData() ], options); + + function update() { + plot.setData([ getRandomData() ]); + // since the axes don't change, we don't need to call plot.setupGrid() + plot.draw(); + + setTimeout(update, updateInterval); + } + + update(); +}); +</script> + + </body> +</html> |