CorrectBisectorDirection Error on geometry with hole

[wlievens]

I'm getting the following exception when feeding a polygon with one hole:

Error
    at Function.CorrectBisectorDirection (D:\Workspaces\griffin\griffin-renderer\node_modules\straight-skeleton\src\lib\SkeletonBuilder.ts:260:10)
    at Function.MultiSplitEvent (D:\Workspaces\griffin\griffin-renderer\node_modules\straight-skeleton\src\lib\SkeletonBuilder.ts:221:9)
    at Function.Build (D:\Workspaces\griffin\griffin-renderer\node_modules\straight-skeleton\src\lib\SkeletonBuilder.ts:103:11)
    at Function.BuildFromGeoJSON (D:\Workspaces\griffin\griffin-renderer\node_modules\straight-skeleton\src\lib\SkeletonBuilder.ts:45:27)

Below is an image of the geometry.

The Live Demo gave me the impression that holes are robustly supported so I figured I'd report this.

This is the exact input to SkeletonBuilder.BuildFromGeoJSON():

const polygon = [[[[-9,-6],[-8.9997727,-6.0843146],[-8.9990909,-6.1685687],[-8.9979546,-6.2527625],[-8.9963637,-6.336895800000001],[-8.9943183,-6.4209687],[-8.9918184,-6.504981300000001],[-8.9888639,-6.588933399999999],[-8.985454899999999,-6.672825100000001],[-8.9815914,-6.7566563],[-8.9772733,-6.8404272],[-8.9725007,-6.9241377],[-8.9672736,-7.007787700000001],[-8.9615919,-7.091377400000001],[-8.9554557,-7.1749066],[-8.9488649,-7.2583754],[-8.9418197,-7.341783800000001],[-8.9343198,-7.4251319],[-8.926365500000001,-7.5084194],[-8.9179566,-7.591646600000001],[-8.9090932,-7.6748134],[-8.8997753,-7.7579198],[-8.8900028,-7.8409657],[-8.8797758,-7.923951300000001],[-8.8690942,-8.006876400000001],[-8.8579581,-8.0897411],[-8.8463675,-8.1725454],[-8.8343224,-8.2552893],[-8.8218227,-8.337972800000001],[-8.8088685,-8.4205959],[-8.7954597,-8.503158599999999],[-8.7815964,-8.5856608],[-8.767278600000001,-8.6681027],[-8.7525062,-8.7504841],[-8.7372794,-8.832805200000001],[-8.721597899999999,-8.915065799999999],[-8.705462,-8.997266],[-8.6888715,-9.0794058],[-8.6718265,-9.1614852],[-8.6543269,-9.2435042],[-8.6363728,-9.325462700000001],[-8.617964200000001,-9.407360899999999],[-8.599101000000001,-9.4891986],[-8.5797833,-9.570976],[-8.5600111,-9.6526929],[-8.539784299999999,-9.7343494],[-8.5191031,-9.8159455],[-8.4979672,-9.897481200000001],[-8.4763769,-9.9789565],[-8.454331999999999,-10.060371400000001],[-8.4318325,-10.1417258],[-8.4088786,-10.2230199],[-8.3854701,-10.304253600000001],[-8.361607,-10.3854268],[-8.3372895,-10.4665396],[-8.3125174,-10.547592000000002],[-8.2872907,-10.628584],[-8.2616096,-10.7095156],[-8.2354739,-10.7903868],[-8.2088836,-10.8711976],[-8.1818388,-10.951948000000002],[-8.154339499999999,-11.0326379],[-8.1263857,-11.1132675],[-8.0979773,-11.193836600000001],[-8.0691144,-11.2743453],[-8.039797,-11.3547936],[-8.010025,-11.435181499999999],[-7.9797985,-11.515509000000002],[-7.9491174,-11.5957761],[-7.9179819,-11.6759828],[-7.8863918,-11.756129000000001],[-7.8543471,-11.8362149],[-7.821847900000001,-11.9162403],[-7.7888942000000005,-11.996205400000001],[-7.755485999999999,-12.07611],[-7.7216232,-12.1559542],[-7.6873059,-12.235738],[-7.652534,-12.3154614],[-7.6173076,-12.3951244],[-7.5816267,-12.4747269],[-7.545491299999999,-12.554269099999999],[-7.5089013,-12.6337509],[-7.471856799999999,-12.7131722],[-7.4343577,-12.7925331],[-7.3964041,-12.8718336],[-7.357996,-12.951073800000001],[-7.3191334,-13.0302535],[-7.279816199999999,-13.109372700000002],[-7.2400443999999995,-13.1884316],[-7.1998182,-13.267430099999999],[-7.1591374000000005,-13.3463681],[-7.1180021,-13.425245799999999],[-7.0764122,-13.504063],[-7.0343678,-13.582819899999999],[-6.9918689,-13.6615163],[-6.948915400000001,-13.7401523],[-6.905507399999999,-13.818727899999999],[-6.861644900000001,-13.8972431],[-6.8173278,-13.9756978],[-6.7725562,-14.0540922],[-6.7273301000000005,-14.132426200000001],[-6.681649500000001,-14.210699700000001],[-6.6355143000000005,-14.2889128],[-6.588924500000001,-14.367065599999998],[-6.5418803,-14.445157899999998],[-6.4943815,-14.5231898],[-6.4464281,-14.6011613],[-6.3980203,-14.679072399999999],[-6.3491578,-14.756923],[-6.2998408999999995,-14.834713299999999],[-6.2500694,-14.912443199999998],[-6.1998434,-14.990112600000002],[-6.1491629,-15.067721599999999],[-6.0980278000000006,-15.1452703],[-6.046438200000001,-15.222758500000001],[-5.9943941,-15.3001863],[-5.9418954,-15.3775537],[-5.8889422,-15.454860700000001],[-5.8355345000000005,-15.532107199999999],[-5.7816722,-15.609293399999999],[-5.7273554,-15.686419100000002],[-5.6725840000000005,-15.763484499999999],[-5.617358100000001,-15.8404894],[-5.561677700000001,-15.9174339],[-5.505542800000001,-15.994318],[-5.4489532999999994,-16.0711418],[-5.3919093,-16.147905],[-5.3344107,-16.2246079],[-5.2764577,-16.301250399999997],[-5.21805,-16.3778325],[-5.1591879,-16.4543541],[-5.0998712,-16.5308153],[-5.0401,-16.6072162],[-4.9798742,-16.6835566],[-4.919194,-16.7598366],[-4.8580591,-16.836056199999998],[-4.7964698,-16.9122154],[-4.734425900000001,-16.9883142],[-4.6719275,-17.0643525],[-4.6089745,-17.1403305],[-4.545567,-17.216248],[-4.481705,-17.2921052],[-4.4173884,-17.3679019],[-4.3526174,-17.4436382],[-4.2873917,-17.5193141],[-4.2217116,-17.5949296],[-4.1555769,-17.6704847],[-4.0889877,-17.7459794],[-4.0219439,-17.8214136],[-3.9544455999999997,-17.8967875],[-3.8864928,-17.972101],[-3.8180853999999997,-18.047354],[-3.7492235000000003,-18.1225466],[-3.6799071,-18.197678800000002],[-3.6101361,-18.272750600000002],[-3.5399106,-18.347762],[-3.4692305999999995,-18.422712999999998],[-3.398096,-18.4976036],[-3.3265069,-18.5724337],[-3.2544633,-18.6472035],[-3.1819650999999998,-18.7219128],[-3.1090124,-18.7965618],[-3.0356052,-18.8711503],[-2.9617434,-18.945678400000002],[-2.8874271,-19.0201461],[-2.8126562,-19.0945534],[-2.7374309,-19.1689003],[-2.661751,-19.2431868],[-2.5856165,-19.3174128],[-2.5090275,-19.3915785],[-2.431984,-19.4656837],[-2.354486,-19.5397285],[-2.2765334,-19.613713],[-2.1981262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[wlievens]

A large portion of the shape is an interpolated bezier, so there are many points. Simplifying the geometry (automatically) is certainly acceptable as I'm only interested in an approximate straight skeleton, so I'll give that a try too.

[wlievens]

If I dramatically simplify the polygon (though it still visually reads as the same shape), the error disappears, so maybe this is a documentation fix only.