1/* Flot plugin for stacking data sets rather than overlyaing them.
2
3Copyright (c) 2007-2013 IOLA and Ole Laursen.
4Licensed under the MIT license.
5
6The plugin assumes the data is sorted on x (or y if stacking horizontally).
7For line charts, it is assumed that if a line has an undefined gap (from a
8null point), then the line above it should have the same gap - insert zeros
9instead of "null" if you want another behaviour. This also holds for the start
10and end of the chart. Note that stacking a mix of positive and negative values
11in most instances doesn't make sense (so it looks weird).
12
13Two or more series are stacked when their "stack" attribute is set to the same
14key (which can be any number or string or just "true"). To specify the default
15stack, you can set the stack option like this:
16
17	series: {
18		stack: null/false, true, or a key (number/string)
19	}
20
21You can also specify it for a single series, like this:
22
23	$.plot( $("#placeholder"), [{
24		data: [ ... ],
25		stack: true
26	}])
27
28The stacking order is determined by the order of the data series in the array
29(later series end up on top of the previous).
30
31Internally, the plugin modifies the datapoints in each series, adding an
32offset to the y value. For line series, extra data points are inserted through
33interpolation. If there's a second y value, it's also adjusted (e.g for bar
34charts or filled areas).
35
36*/(function(e){function n(e){function t(e,t){var n=null;for(var r=0;r<t.length;++r){if(e==t[r])break;t[r].stack==e.stack&&(n=t[r])}return n}function n(e,n,r){if(n.stack==null||n.stack===!1)return;var i=t(n,e.getData());if(!i)return;var s=r.pointsize,o=r.points,u=i.datapoints.pointsize,a=i.datapoints.points,f=[],l,c,h,p,d,v,m=n.lines.show,g=n.bars.horizontal,y=s>2&&(g?r.format[2].x:r.format[2].y),b=m&&n.lines.steps,w=!0,E=g?1:0,S=g?0:1,x=0,T=0,N,C;for(;;){if(x>=o.length)break;N=f.length;if(o[x]==null){for(C=0;C<s;++C)f.push(o[x+C]);x+=s}else if(T>=a.length){if(!m)for(C=0;C<s;++C)f.push(o[x+C]);x+=s}else if(a[T]==null){for(C=0;C<s;++C)f.push(null);w=!0,T+=u}else{l=o[x+E],c=o[x+S],p=a[T+E],d=a[T+S],v=0;if(l==p){for(C=0;C<s;++C)f.push(o[x+C]);f[N+S]+=d,v=d,x+=s,T+=u}else if(l>p){if(m&&x>0&&o[x-s]!=null){h=c+(o[x-s+S]-c)*(p-l)/(o[x-s+E]-l),f.push(p),f.push(h+d);for(C=2;C<s;++C)f.push(o[x+C]);v=d}T+=u}else{if(w&&m){x+=s;continue}for(C=0;C<s;++C)f.push(o[x+C]);m&&T>0&&a[T-u]!=null&&(v=d+(a[T-u+S]-d)*(l-p)/(a[T-u+E]-p)),f[N+S]+=v,x+=s}w=!1,N!=f.length&&y&&(f[N+2]+=v)}if(b&&N!=f.length&&N>0&&f[N]!=null&&f[N]!=f[N-s]&&f[N+1]!=f[N-s+1]){for(C=0;C<s;++C)f[N+s+C]=f[N+C];f[N+1]=f[N-s+1]}}r.points=f}e.hooks.processDatapoints.push(n)}var t={series:{stack:null}};e.plot.plugins.push({init:n,options:t,name:"stack",version:"1.2"})})(jQuery);