root / hci / trunk / eneraptor-web-app / web-app / js / flot / jquery.flot.threshold.js @ 11
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1 | 11 | alexbesir | /*
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2 | Flot plugin for thresholding data. Controlled through the option
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3 | "threshold" in either the global series options
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4 | |||
5 | series: {
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6 | threshold: {
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7 | below: number
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8 | color: colorspec
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9 | }
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10 | }
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11 | |||
12 | or in a specific series
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13 | |||
14 | $.plot($("#placeholder"), [{ data: [ ... ], threshold: { ... }}])
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15 | |||
16 | The data points below "below" are drawn with the specified color. This
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17 | makes it easy to mark points below 0, e.g. for budget data.
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18 | |||
19 | Internally, the plugin works by splitting the data into two series,
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20 | above and below the threshold. The extra series below the threshold
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21 | will have its label cleared and the special "originSeries" attribute
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22 | set to the original series. You may need to check for this in hover
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23 | events.
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24 | */
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25 | |||
26 | (function ($) { |
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27 | var options = {
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28 | series: { threshold: null } // or { below: number, color: color spec} |
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29 | }; |
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30 | |||
31 | function init(plot) { |
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32 | function thresholdData(plot, s, datapoints) { |
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33 | if (!s.threshold)
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34 | return;
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35 | |||
36 | var ps = datapoints.pointsize, i, x, y, p, prevp,
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37 | thresholded = $.extend({}, s); // note: shallow copy |
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38 | |||
39 | thresholded.datapoints = { points: [], pointsize: ps }; |
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40 | thresholded.label = null;
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41 | thresholded.color = s.threshold.color; |
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42 | thresholded.threshold = null;
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43 | thresholded.originSeries = s; |
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44 | thresholded.data = []; |
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45 | |||
46 | var below = s.threshold.below,
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47 | origpoints = datapoints.points, |
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48 | addCrossingPoints = s.lines.show; |
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49 | |||
50 | threspoints = []; |
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51 | newpoints = []; |
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52 | |||
53 | for (i = 0; i < origpoints.length; i += ps) { |
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54 | x = origpoints[i] |
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55 | y = origpoints[i + 1];
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56 | |||
57 | prevp = p; |
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58 | if (y < below)
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59 | p = threspoints; |
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60 | else
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61 | p = newpoints; |
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62 | |||
63 | if (addCrossingPoints && prevp != p && x != null |
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64 | && i > 0 && origpoints[i - ps] != null) { |
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65 | var interx = (x - origpoints[i - ps]) / (y - origpoints[i - ps + 1]) * (below - y) + x; |
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66 | prevp.push(interx); |
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67 | prevp.push(below); |
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68 | for (m = 2; m < ps; ++m) |
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69 | prevp.push(origpoints[i + m]); |
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70 | |||
71 | p.push(null); // start new segment |
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72 | p.push(null);
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73 | for (m = 2; m < ps; ++m) |
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74 | p.push(origpoints[i + m]); |
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75 | p.push(interx); |
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76 | p.push(below); |
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77 | for (m = 2; m < ps; ++m) |
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78 | p.push(origpoints[i + m]); |
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79 | } |
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80 | |||
81 | p.push(x); |
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82 | p.push(y); |
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83 | } |
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84 | |||
85 | datapoints.points = newpoints; |
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86 | thresholded.datapoints.points = threspoints; |
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87 | |||
88 | if (thresholded.datapoints.points.length > 0) |
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89 | plot.getData().push(thresholded); |
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90 | |||
91 | // FIXME: there are probably some edge cases left in bars
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92 | } |
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93 | |||
94 | plot.hooks.processDatapoints.push(thresholdData); |
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95 | } |
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96 | |||
97 | $.plot.plugins.push({
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98 | init: init,
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99 | options: options,
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100 | name: 'threshold', |
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101 | version: '1.0' |
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102 | }); |
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103 | })(jQuery); |