/* Flot plugin for thresholding data.
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Copyright (c) 2007-2014 IOLA and Ole Laursen.
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Licensed under the MIT license.
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The plugin supports these 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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It can also be applied to a single series, like this:
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$.plot( $("#placeholder"), [{
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data: [ ... ],
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threshold: { ... }
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}])
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An array can be passed for multiple thresholding, like this:
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threshold: [{
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below: number1
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color: color1
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},{
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below: number2
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color: color2
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}]
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These multiple threshold objects can be passed in any order since they are
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sorted by the processing function.
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The data points below "below" are drawn with the specified color. This makes
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it easy to mark points below 0, e.g. for budget data.
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Internally, the plugin works by splitting the data into two series, above and
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below the threshold. The extra series below the threshold will have its label
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cleared and the special "originSeries" attribute set to the original series.
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You may need to check for this in hover events.
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*/
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(function ($) {
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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, below, color) {
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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, format: datapoints.format };
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thresholded.label = null;
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thresholded.color = 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 origpoints = datapoints.points,
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addCrossingPoints = s.lines.show;
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var threspoints = [];
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var newpoints = [];
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var m;
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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 + (below - y) * (x - origpoints[i - ps]) / (y - origpoints[i - ps + 1]);
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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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for (m = 2; m < ps; ++m)
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p.push(origpoints[i + m]);
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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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var origIndex = $.inArray(s, plot.getData());
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// Insert newly-generated series right after original one (to prevent it from becoming top-most)
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plot.getData().splice(origIndex + 1, 0, thresholded);
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}
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// FIXME: there are probably some edge cases left in bars
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}
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function processThresholds(plot, s, datapoints) {
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if (!s.threshold)
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return;
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if (s.threshold instanceof Array) {
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s.threshold.sort(function(a, b) {
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return a.below - b.below;
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});
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$(s.threshold).each(function(i, th) {
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thresholdData(plot, s, datapoints, th.below, th.color);
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});
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}
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else {
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thresholdData(plot, s, datapoints, s.threshold.below, s.threshold.color);
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}
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}
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plot.hooks.processDatapoints.push(processThresholds);
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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: '1.2'
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});
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})(jQuery);
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