javascript - D3.js Flipping text at the bottom half of a donut (arcs) -


i following this tutorial. made last part, data, code doesn't work (i explain later).

here's jsfiddle of code far. have commented part flips text works.

if (d.endangle > 90 * math.pi/180) {    var startloc     = /m(.*?)a/,            middleloc    = /a(.*?)0 0 1/,    endloc       = /0 0 1 (.*?)$/;    var newstart = endloc.exec( newarc )[1];    var newend = startloc.exec( newarc )[1];    var middlesec = middleloc.exec( newarc )[1];    newarc = "m" + newstart + "a" + middlesec + "0 0 0 " + newend; }

so far, have not understood regex (even before part, var firstarcsection = /(^.+?)l/;). factor should angle, , should rotate text 180 degrees , place around arc again facing right way.

here's data: 

var donutdata = [         {name: "firstarc", value: 16},         {name: "secondarc", value: 9},         {name: "thirdarc",  value: 2},         {name: "fourtharc", value: 62},         {name: "fiftharc", value: 23},         {name: "sixtharc", value: 21} ];

here's issue: code above works in configurations, if change value of "thirdarc" 20 instance, or if change other values. cases work, don't (endloc.exec( newarc )[1]; becomes undefined).

i have seen related question, have no idea causes text flipped @ bottom in jsfiddle, there nothing angle or start , end points.

my questions how flip texts @ bottom half of first jsfiddle, , regex for?


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