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);