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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);