tSegs startTriangle TSelf Segments pSeg Segment startTriangle TSelf Ce

tSegs := startTriangle.TSelf.Segments()
    pSeg  := Segment{p, startTriangle.TSelf.Centre()}

    ind := -1

    for i, tSeg := range tSegs {
        if pSeg.Intersects(tSeg) {
            ind = i
            break
        }
    }