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 | /* Flot plugin for computing bottoms for filled line and bar charts. The case: you've got two series that you want to fill the area between. In Flot terms, you need to use one as the fill bottom of the other. You can specify the bottom of each data point as the third coordinate manually, or you can use this plugin to compute it for you. In order to name the other series, you need to give it an id, like this var dataset = [ { data: [ ... ], id: "foo" } , // use default bottom { data: [ ... ], fillBetween: "foo" }, // use first dataset as bottom ]; $.plot($("#placeholder"), dataset, { line: { show: true, fill: true }}); As a convenience, if the id given is a number that doesn't appear as an id in the series, it is interpreted as the index in the array instead (so fillBetween: 0 can also mean the first series). Internally, the plugin modifies the datapoints in each series. For line series, extra data points might be inserted through interpolation. Note that at points where the bottom line is not defined (due to a null point or start/end of line), the current line will show a gap too. The algorithm comes from the jquery.flot.stack.js plugin, possibly some code could be shared. */ (function ($) { var options = { series: { fillBetween: null } // or number }; function init(plot) { function findBottomSeries(s, allseries) { var i; for (i = 0; i < allseries.length; ++i) { if (allseries[i].id == s.fillBetween) return allseries[i]; } if (typeof s.fillBetween == "number") { i = s.fillBetween; if (i < 0 || i >= allseries.length) return null; return allseries[i]; } return null; } function computeFillBottoms(plot, s, datapoints) { if (s.fillBetween == null) return; var other = findBottomSeries(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, withbottom = ps > 2 && datapoints.format[2].y, withsteps = withlines && s.lines.steps, fromgap = true, 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]; py = points[i + 1]; qx = otherpoints[j]; qy = otherpoints[j + 1]; bottom = 0; if (px == qx) { for (m = 0; m < ps; ++m) newpoints.push(points[i + m]); //newpoints[l + 1] += 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 + 1] - py) * (qx - px) / (points[i - ps] - px); newpoints.push(qx); newpoints.push(intery) 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 + 1] - qy) * (px - qx) / (otherpoints[j - otherps] - qx); //newpoints[l + 1] += 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(computeFillBottoms); } $.plot.plugins.push({ init: init, options: options, name: 'fillbetween', version: '1.0' }); })(jQuery); |