// line segment can have 0 or 1 intersection interval with clipEnv2D.
// The function return 0 or 2 segParams (e.g. 0.0, 0.4; or 0.1, 0.9; or 0.6,
// 1.0; or 0.0, 1.0)
// segParams will be sorted in ascending order; the order of the
// envelopeDistances will correspond (i.e. the envelopeDistances may not be
// in ascending order);
// an envelopeDistance can be -1.0 if the corresponding endpoint is properly
// inside clipEnv2D.
internal int IntersectionWithEnvelope2D(com.epl.geometry.Envelope2D clipEnv2D, bool includeEnvBoundary, double[] segParams, double[] envelopeDistances)
{
com.epl.geometry.Point2D p1 = GetStartXY();
com.epl.geometry.Point2D p2 = GetEndXY();
// includeEnvBoundary xxx ???
int modified = clipEnv2D.ClipLine(p1, p2, 0, segParams, envelopeDistances);
return(modified != 0 ? 2 : 0);
}