From e4625bd71ece0b237bb75f35031def8a1590ad92 Mon Sep 17 00:00:00 2001
From: Richard Brice <37087370+RickBrice@users.noreply.github.com>
Date: Sun, 5 May 2024 11:40:02 -0700
Subject: [PATCH] Fixes parabolic curves in IfcAlignment examples and helper
 functions

---
 src/examples/IfcAlignment.cpp       | 2 +-
 src/ifcparse/IfcAlignmentHelper.cpp | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/examples/IfcAlignment.cpp b/src/examples/IfcAlignment.cpp
index a80ca10c97..6571585cc9 100644
--- a/src/examples/IfcAlignment.cpp
+++ b/src/examples/IfcAlignment.cpp
@@ -151,7 +151,7 @@ std::pair<typename Schema::IfcCurveSegment*, typename Schema::IfcAlignmentSegmen
 // creates geometry and business logic segments for vertical profile parabolic vertical curves
 std::pair<typename Schema::IfcCurveSegment*, typename Schema::IfcAlignmentSegment*> create_vcurve(typename Schema::IfcCartesianPoint* p, double start_slope, double end_slope, double length) {
     // geometry
-    double A = 0.0;
+    double A = p->Coordinates()[1];
     double B = start_slope;
     double C = (end_slope - start_slope) / (2 * length);
 
diff --git a/src/ifcparse/IfcAlignmentHelper.cpp b/src/ifcparse/IfcAlignmentHelper.cpp
index 08e17043b3..e16ddbc39e 100644
--- a/src/ifcparse/IfcAlignmentHelper.cpp
+++ b/src/ifcparse/IfcAlignmentHelper.cpp
@@ -696,7 +696,7 @@ std::pair<Ifc4x3_add2::IfcCurveSegment*, Ifc4x3_add2::IfcCurveSegment*> mapAlign
         result.first = curve_segment;
 
     } else if (type == Ifc4x3_add2::IfcAlignmentVerticalSegmentTypeEnum::IfcAlignmentVerticalSegmentType_PARABOLICARC) {
-        double A = 0.0;
+        double A = start_height;
         double B = start_gradient;
         double C = (end_gradient - start_gradient) / (2 * horizontal_length);