vis.js is a dynamic, browser-based visualization library
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<title>Graph2d | Interpolation</title>
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<h2>Graph2d | Interpolation</h2>
<div style="width:700px; font-size:14px; text-align: justify;">
The Graph2d makes use of <a href="http://en.wikipedia.org/wiki/Centripetal_Catmull%E2%80%93Rom_spline" target="_blank">Catmull-Rom spline interpolation</a>.
The user can configure these per group, or globally. In this example we show all 4 possiblities. The differences are in the parametrization of
the curves. The options are <code>uniform</code>, <code>chordal</code> and <code>centripetal</code>. Alternatively you can disable the Catmull-Rom interpolation and
a linear interpolation will be used. The <code>centripetal</code> parametrization produces the best result (no self intersection, yet follows the line closely) and is therefore the default setting.
<br /><br />
For both the <code>centripetal</code> and <code>chordal</code> parametrization, the distances between the points have to be calculated and this makes these methods computationally intensive
if there are very many points. The <code>uniform</code> parametrization still has to do transformations, though it does not have to calculate the distance between point. Finally, the
linear interpolation is the fastest method. For more on the Catmull-Rom method, <a href="http://www.cemyuksel.com/research/catmullrom_param/catmullrom.pdf" target="_blank">C. Yuksel et al. have an interesting paper titled &Prime;On the parametrization of Catmull-Rom Curves&Prime;</a>.
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<div id="visualization"></div>
<script type="text/javascript">
// create a dataSet with groups
var names = ['centripetal', 'chordal', 'uniform', 'disabled'];
var groups = new vis.DataSet();
groups.add({
id: 0,
content: names[0],
options: {
drawPoints: false,
catmullRom: {
parametrization: 'centripetal'
}
}});
groups.add({
id: 1,
content: names[1],
options: {
drawPoints: false,
catmullRom: {
parametrization: 'chordal'
}
}});
groups.add({
id: 2,
content: names[2],
options: {
drawPoints: false,
catmullRom: {
parametrization: 'uniform'
}
}
});
groups.add({
id: 3,
content: names[3],
options: {
drawPoints: { style: 'circle' },
catmullRom: false
}});
var container = document.getElementById('visualization');
var dataset = new vis.DataSet();
for (var i = 0; i < names.length; i++) {
dataset.add( [
{x: '2014-06-12', y: 0 , group: i},
{x: '2014-06-13', y: 40, group: i},
{x: '2014-06-14', y: 10, group: i},
{x: '2014-06-15', y: 15, group: i},
{x: '2014-06-15', y: 30, group: i},
{x: '2014-06-17', y: 10, group: i},
{x: '2014-06-18', y: 15, group: i},
{x: '2014-06-19', y: 52, group: i},
{x: '2014-06-20', y: 10, group: i},
{x: '2014-06-21', y: 20, group: i}
]);
}
var options = {
dataPoints: false,
dataAxis: {visible: false},
legend: true,
start: '2014-06-11',
end: '2014-06-22'
};
var graph2d = new vis.Graph2d(container, dataset, groups, options);
</script>
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