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authorEbus-at-dockstar <ebus@dockstar>2013-04-30 17:50:25 +0200
committerEbus-at-dockstar <ebus@dockstar>2013-04-30 17:50:52 +0200
commita3f3c9d7a9bb5237628eaa30b550c9cc5d3dcdc2 (patch)
tree61e49ad91c7472a5836bd51224e7d1195eb16a28 /datastore-leveldb/wwwroot_ebus/lib/flot-0.7/jquery.flot.fillbetween.js
parent5e002f200691d5fd9c46ff645668b82e17c2261b (diff)
downloadebus-alt-a3f3c9d7a9bb5237628eaa30b550c9cc5d3dcdc2.tar.gz
ebus-alt-a3f3c9d7a9bb5237628eaa30b550c9cc5d3dcdc2.zip
wwwroot_ebus
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+/*
+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);