getEnvelope method
Gets the envelope of the chain.
@return the envelope of the chain
Implementation
Envelope getEnvelope() {
if (env == null) {
/**
* The monotonicity property allows fast envelope determination
*/
Coordinate p0 = pts[start];
Coordinate p1 = pts[end];
env = new Envelope.fromCoordinates(p0, p1);
}
return env!;
}