1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 | /* Flot plugin for stacking data sets, i.e. putting them on top of each other, for accumulative graphs. The plugin assumes the data is sorted on x (or y if stacking horizontally). For line charts, it is assumed that if a line has an undefined gap (from a null point), then the line above it should have the same gap - insert zeros instead of "null" if you want another behaviour. This also holds for the start and end of the chart. Note that stacking a mix of positive and negative values in most instances doesn't make sense (so it looks weird). Two or more series are stacked when their "stack" attribute is set to the same key (which can be any number or string or just "true"). To specify the default stack, you can set series: { stack: null or true or key (number/string) } or specify it for a specific series $.plot($("#placeholder"), [{ data: [ ... ], stack: true }]) The stacking order is determined by the order of the data series in the array (later series end up on top of the previous). Internally, the plugin modifies the datapoints in each series, adding an offset to the y value. For line series, extra data points are inserted through interpolation. If there's a second y value, it's also adjusted (e.g for bar charts or filled areas). */ (function ($) { var options = { series: { stack: null } // or number/string }; function init(plot) { function findMatchingSeries(s, allseries) { var res = null for (var i = 0; i < allseries.length; ++i) { if (s == allseries[i]) break; if (allseries[i].stack == s.stack) res = allseries[i]; } return res; } function stackData(plot, s, datapoints) { if (s.stack == null) return; var other = findMatchingSeries(s, plot.getData()); if (!other) return; var ps = datapoints.pointsize, points = datapoints.points, otherps = other.datapoints.pointsize, otherpoints = other.datapoints.points, newpoints = [], px, py, intery, qx, qy, bottom, withlines = s.lines.show, horizontal = s.bars.horizontal, withbottom = ps > 2 && (horizontal ? datapoints.format[2].x : datapoints.format[2].y), withsteps = withlines && s.lines.steps, fromgap = true, keyOffset = horizontal ? 1 : 0, accumulateOffset = horizontal ? 0 : 1, i = 0, j = 0, l; while (true) { if (i >= points.length) break; l = newpoints.length; if (points[i] == null) { // copy gaps for (m = 0; m < ps; ++m) newpoints.push(points[i + m]); i += ps; } else if (j >= otherpoints.length) { // for lines, we can't use the rest of the points if (!withlines) { for (m = 0; m < ps; ++m) newpoints.push(points[i + m]); } i += ps; } else if (otherpoints[j] == null) { // oops, got a gap for (m = 0; m < ps; ++m) newpoints.push(null); fromgap = true; j += otherps; } else { // cases where we actually got two points px = points[i + keyOffset]; py = points[i + accumulateOffset]; qx = otherpoints[j + keyOffset]; qy = otherpoints[j + accumulateOffset]; bottom = 0; if (px == qx) { for (m = 0; m < ps; ++m) newpoints.push(points[i + m]); newpoints[l + accumulateOffset] += qy; bottom = qy; i += ps; j += otherps; } else if (px > qx) { // we got past point below, might need to // insert interpolated extra point if (withlines && i > 0 && points[i - ps] != null) { intery = py + (points[i - ps + accumulateOffset] - py) * (qx - px) / (points[i - ps + keyOffset] - px); newpoints.push(qx); newpoints.push(intery + qy); for (m = 2; m < ps; ++m) newpoints.push(points[i + m]); bottom = qy; } j += otherps; } else { // px < qx if (fromgap && withlines) { // if we come from a gap, we just skip this point i += ps; continue; } for (m = 0; m < ps; ++m) newpoints.push(points[i + m]); // we might be able to interpolate a point below, // this can give us a better y if (withlines && j > 0 && otherpoints[j - otherps] != null) bottom = qy + (otherpoints[j - otherps + accumulateOffset] - qy) * (px - qx) / (otherpoints[j - otherps + keyOffset] - qx); newpoints[l + accumulateOffset] += bottom; i += ps; } fromgap = false; if (l != newpoints.length && withbottom) newpoints[l + 2] += bottom; } // maintain the line steps invariant if (withsteps && l != newpoints.length && l > 0 && newpoints[l] != null && newpoints[l] != newpoints[l - ps] && newpoints[l + 1] != newpoints[l - ps + 1]) { for (m = 0; m < ps; ++m) newpoints[l + ps + m] = newpoints[l + m]; newpoints[l + 1] = newpoints[l - ps + 1]; } } datapoints.points = newpoints; } plot.hooks.processDatapoints.push(stackData); } $.plot.plugins.push({ init: init, options: options, name: 'stack', version: '1.2' }); })(jQuery); |