IllegalStateException is not defined

[quachc]

We see this reference error being thrown from: LineSegment#pointAlongOffset (jsts/src/org/locationtech/jts/geom/LineSegment.js:202:22)

[bjornharrtell]

Can you supply a failing test case?

[quachc]

See https://github.com/quachc/jsts/blob/master/test/manual/geom/LineSegment.js

[bjornharrtell]

@quachc IllegalStateException was not correctly implemented, fixed by 5f866f9.

However, your test case is with input that is intended to fail which is the reason that it wants to throw IllegalStateException. I'm pretty sure it works in latest release with valid data (i.e segment cannot be zero length).