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authorFilipp Lepalaan <filipp@mac.com>2017-04-24 10:36:10 +0300
committerFilipp Lepalaan <filipp@mac.com>2017-04-24 10:36:10 +0300
commitc1e043b7ba78cee73d13ded9ef03b256202540f1 (patch)
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-/* Flot plugin for computing bottoms for filled line and bar charts.
-
-Copyright (c) 2007-2013 IOLA and Ole Laursen.
-Licensed under the MIT license.
-
-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, { lines: { 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" ) {
- if ( s.fillBetween < 0 || s.fillBetween >= allseries.length ) {
- return null;
- }
- return allseries[ s.fillBetween ];
- }
-
- 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, m;
-
- 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 we come from a gap, we just skip this point
-
- if ( fromgap && withlines ) {
- 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);