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| 58d006 | 1 | /* Flot plugin for thresholding data. |
| A | 2 | |
| 3 | Copyright (c) 2007-2013 IOLA and Ole Laursen. | |
| 4 | Licensed under the MIT license. | |
| 5 | ||
| 6 | The plugin supports these options: | |
| 7 | ||
| 8 | series: { | |
| 9 | threshold: { | |
| 10 | below: number | |
| 11 | color: colorspec | |
| 12 | } | |
| 13 | } | |
| 14 | ||
| 15 | It can also be applied to a single series, like this: | |
| 16 | ||
| 17 | $.plot( $("#placeholder"), [{ | |
| 18 | data: [ ... ], | |
| 19 | threshold: { ... } | |
| 20 | }]) | |
| 21 | ||
| 22 | An array can be passed for multiple thresholding, like this: | |
| 23 | ||
| 24 | threshold: [{ | |
| 25 | below: number1 | |
| 26 | color: color1 | |
| 27 | },{ | |
| 28 | below: number2 | |
| 29 | color: color2 | |
| 30 | }] | |
| 31 | ||
| 32 | These multiple threshold objects can be passed in any order since they are | |
| 33 | sorted by the processing function. | |
| 34 | ||
| 35 | The data points below "below" are drawn with the specified color. This makes | |
| 36 | it easy to mark points below 0, e.g. for budget data. | |
| 37 | ||
| 38 | Internally, the plugin works by splitting the data into two series, above and | |
| 39 | below the threshold. The extra series below the threshold will have its label | |
| 40 | cleared and the special "originSeries" attribute set to the original series. | |
| 41 | You may need to check for this in hover events. | |
| 42 | ||
| 43 | */ | |
| 44 | ||
| 45 | (function ($) { | |
| 46 | var options = { | |
| 47 | series: { threshold: null } // or { below: number, color: color spec} | |
| 48 | }; | |
| 49 | ||
| 50 | function init(plot) { | |
| 51 | function thresholdData(plot, s, datapoints, below, color) { | |
| 52 | var ps = datapoints.pointsize, i, x, y, p, prevp, | |
| 53 | thresholded = $.extend({}, s); // note: shallow copy | |
| 54 | ||
| 55 | thresholded.datapoints = { points: [], pointsize: ps, format: datapoints.format }; | |
| 56 | thresholded.label = null; | |
| 57 | thresholded.color = color; | |
| 58 | thresholded.threshold = null; | |
| 59 | thresholded.originSeries = s; | |
| 60 | thresholded.data = []; | |
| 61 | ||
| 62 | var origpoints = datapoints.points, | |
| 63 | addCrossingPoints = s.lines.show; | |
| 64 | ||
| 65 | var threspoints = []; | |
| 66 | var newpoints = []; | |
| 67 | var m; | |
| 68 | ||
| 69 | for (i = 0; i < origpoints.length; i += ps) { | |
| 70 | x = origpoints[i]; | |
| 71 | y = origpoints[i + 1]; | |
| 72 | ||
| 73 | prevp = p; | |
| 74 | if (y < below) | |
| 75 | p = threspoints; | |
| 76 | else | |
| 77 | p = newpoints; | |
| 78 | ||
| 79 | if (addCrossingPoints && prevp != p && x != null | |
| 80 | && i > 0 && origpoints[i - ps] != null) { | |
| 81 | var interx = x + (below - y) * (x - origpoints[i - ps]) / (y - origpoints[i - ps + 1]); | |
| 82 | prevp.push(interx); | |
| 83 | prevp.push(below); | |
| 84 | for (m = 2; m < ps; ++m) | |
| 85 | prevp.push(origpoints[i + m]); | |
| 86 | ||
| 87 | p.push(null); // start new segment | |
| 88 | p.push(null); | |
| 89 | for (m = 2; m < ps; ++m) | |
| 90 | p.push(origpoints[i + m]); | |
| 91 | p.push(interx); | |
| 92 | p.push(below); | |
| 93 | for (m = 2; m < ps; ++m) | |
| 94 | p.push(origpoints[i + m]); | |
| 95 | } | |
| 96 | ||
| 97 | p.push(x); | |
| 98 | p.push(y); | |
| 99 | for (m = 2; m < ps; ++m) | |
| 100 | p.push(origpoints[i + m]); | |
| 101 | } | |
| 102 | ||
| 103 | datapoints.points = newpoints; | |
| 104 | thresholded.datapoints.points = threspoints; | |
| 105 | ||
| 106 | if (thresholded.datapoints.points.length > 0) { | |
| 107 | var origIndex = $.inArray(s, plot.getData()); | |
| 108 | // Insert newly-generated series right after original one (to prevent it from becoming top-most) | |
| 109 | plot.getData().splice(origIndex + 1, 0, thresholded); | |
| 110 | } | |
| 111 | ||
| 112 | // FIXME: there are probably some edge cases left in bars | |
| 113 | } | |
| 114 | ||
| 115 | function processThresholds(plot, s, datapoints) { | |
| 116 | if (!s.threshold) | |
| 117 | return; | |
| 118 | ||
| 119 | if (s.threshold instanceof Array) { | |
| 120 | s.threshold.sort(function(a, b) { | |
| 121 | return a.below - b.below; | |
| 122 | }); | |
| 123 | ||
| 124 | $(s.threshold).each(function(i, th) { | |
| 125 | thresholdData(plot, s, datapoints, th.below, th.color); | |
| 126 | }); | |
| 127 | } | |
| 128 | else { | |
| 129 | thresholdData(plot, s, datapoints, s.threshold.below, s.threshold.color); | |
| 130 | } | |
| 131 | } | |
| 132 | ||
| 133 | plot.hooks.processDatapoints.push(processThresholds); | |
| 134 | } | |
| 135 | ||
| 136 | $.plot.plugins.push({ | |
| 137 | init: init, | |
| 138 | options: options, | |
| 139 | name: 'threshold', | |
| 140 | version: '1.2' | |
| 141 | }); | |
| 142 | })(jQuery); | |
