jos
11 years ago
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examples/graph2d/15_streaming_data.html
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| <!DOCTYPE HTML> | |||
| <html> | |||
| <head> | |||
| <meta content="text/html;charset=utf-8" http-equiv="Content-Type"> | |||
| <meta content="utf-8" http-equiv="encoding"> | |||
| <title>Graph2d | Streaming data</title> | |||
| <style type="text/css"> | |||
| body, html, select { | |||
| font: 10pt sans-serif; | |||
| } | |||
| </style> | |||
| <script src="../../dist/vis.js"></script> | |||
| <link href="../../dist/vis.css" rel="stylesheet" type="text/css" /> | |||
| </head> | |||
| <body> | |||
| <h2>Graph2d | Streaming data</h2> | |||
| <p> | |||
| This example demonstrates how to apply streaming data input to the Graph2d.<br> | |||
| </p> | |||
| <p> | |||
| <label for="strategy">Strategy:</label> | |||
| <select id="strategy"> | |||
| <option value="continuous" selected>Continuous</option> | |||
| <option value="discrete">Discrete</option> | |||
| </select> | |||
| </p> | |||
| <div id="visualization"></div> | |||
| <script type="text/javascript"> | |||
| var strategy = document.getElementById('strategy'); | |||
| // create a graph2d with an (currently empty) dataset | |||
| var container = document.getElementById('visualization'); | |||
| var dataset = new vis.DataSet(); | |||
| var options = { | |||
| start: vis.moment().add(-60, 'seconds'), | |||
| end: vis.moment() | |||
| }; | |||
| var graph2d = new vis.Graph2d(container, dataset, options); | |||
| // a function to generate data points | |||
| function y(x) { | |||
| return (Math.sin(x / 2) + Math.cos(x / 4)) * 5; | |||
| } | |||
| var delay = 500; // delay in ms | |||
| var x = 0; | |||
| function next() { | |||
| var now = vis.moment(); | |||
| // add a new data point to the data | |||
| dataset.add({ | |||
| x: now, | |||
| y: y(now / 1000) | |||
| }); | |||
| x += 0.1; | |||
| // move the window (you can think of different strategies). | |||
| var range = graph2d.getWindow(); | |||
| var interval = range.end - range.start; | |||
| switch (strategy.value) { | |||
| case 'continuous': | |||
| // continuously move the window | |||
| graph2d.setWindow(now - interval, now, {animate: false}); | |||
| break; | |||
| default: // 'discrete' | |||
| // move the window 90% to the left when now is larger than the visible end | |||
| if (now > range.end) { | |||
| graph2d.setWindow(now - 0.1 * interval, now + 0.9 * interval); | |||
| } | |||
| break; | |||
| } | |||
| // remove all data points older than 1 minute | |||
| var min = now.add(-60, 'seconds'); | |||
| var oldIds = dataset.getIds({ | |||
| filter: function (item) { | |||
| return item.x < min; | |||
| } | |||
| }); | |||
| if (oldIds.length > 0) dataset.remove(oldIds); | |||
| setTimeout(next, delay); | |||
| } | |||
| next(); | |||
| </script> | |||
| </body> | |||
| </html> | |||