From d9d96a2e66ee3ff91c1498a0e4bcba7e6842b9f3 Mon Sep 17 00:00:00 2001
From: Martin Davis <mtnclimb@gmail.com>
Date: Tue, 5 Nov 2024 14:45:36 -0800
Subject: [PATCH] Fix TaggedLineString as per JTS 1096

---
 src/simplify/TaggedLineString.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/simplify/TaggedLineString.cpp b/src/simplify/TaggedLineString.cpp
index e0dc40ddbf..9a6d09324d 100644
--- a/src/simplify/TaggedLineString.cpp
+++ b/src/simplify/TaggedLineString.cpp
@@ -169,7 +169,7 @@ TaggedLineString::extractCoordinates(
 
     if(size) {
         for(std::size_t i = 0; i < size; i++) {
-            TaggedLineSegment* seg = segs[i];
+                TaggedLineSegment* seg = segs[i];
             assert(seg);
             pts->add(seg->p0);
         }
@@ -185,7 +185,6 @@ TaggedLineString::extractCoordinates(
 const Coordinate&
 TaggedLineString::getCoordinate(std::size_t i) const
 {
-
     return parentLine->getCoordinateN(i);
 }
 
@@ -198,6 +197,10 @@ TaggedLineString::size() const
 const Coordinate&
 TaggedLineString::getComponentPoint() const
 {
+    //-- when simplified use a valid coordinate
+    if (resultSegs.size() > 0) {
+        return resultSegs[0]->p0;
+    }
     return getParentCoordinates()->getAt(1);
 }