104 lines
3.2 KiB
JavaScript
104 lines
3.2 KiB
JavaScript
/*
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Flot plugin for thresholding data. Controlled through the option
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"threshold" in either the global series options
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series: {
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threshold: {
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below: number
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color: colorspec
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}
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}
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or in a specific series
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$.plot($("#placeholder"), [{ data: [ ... ], threshold: { ... }}])
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The data points below "below" are drawn with the specified color. This
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makes it easy to mark points below 0, e.g. for budget data.
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Internally, the plugin works by splitting the data into two series,
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above and below the threshold. The extra series below the threshold
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will have its label cleared and the special "originSeries" attribute
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set to the original series. You may need to check for this in hover
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events.
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*/
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(function ($) {
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var options = {
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series: { threshold: null } // or { below: number, color: color spec}
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};
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function init(plot) {
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function thresholdData(plot, s, datapoints) {
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if (!s.threshold)
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return;
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var ps = datapoints.pointsize, i, x, y, p, prevp,
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thresholded = $.extend({}, s); // note: shallow copy
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thresholded.datapoints = { points: [], pointsize: ps };
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thresholded.label = null;
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thresholded.color = s.threshold.color;
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thresholded.threshold = null;
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thresholded.originSeries = s;
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thresholded.data = [];
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var below = s.threshold.below,
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origpoints = datapoints.points,
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addCrossingPoints = s.lines.show;
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threspoints = [];
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newpoints = [];
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for (i = 0; i < origpoints.length; i += ps) {
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x = origpoints[i]
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y = origpoints[i + 1];
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prevp = p;
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if (y < below)
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p = threspoints;
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else
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p = newpoints;
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if (addCrossingPoints && prevp != p && x != null
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&& i > 0 && origpoints[i - ps] != null) {
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var interx = (x - origpoints[i - ps]) / (y - origpoints[i - ps + 1]) * (below - y) + x;
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prevp.push(interx);
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prevp.push(below);
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for (m = 2; m < ps; ++m)
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prevp.push(origpoints[i + m]);
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p.push(null); // start new segment
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p.push(null);
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for (m = 2; m < ps; ++m)
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p.push(origpoints[i + m]);
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p.push(interx);
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p.push(below);
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for (m = 2; m < ps; ++m)
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p.push(origpoints[i + m]);
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}
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p.push(x);
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p.push(y);
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}
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datapoints.points = newpoints;
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thresholded.datapoints.points = threspoints;
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if (thresholded.datapoints.points.length > 0)
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plot.getData().push(thresholded);
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// FIXME: there are probably some edge cases left in bars
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}
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plot.hooks.processDatapoints.push(thresholdData);
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}
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$.plot.plugins.push({
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init: init,
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options: options,
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name: 'threshold',
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version: '1.0'
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});
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})(jQuery);
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