From fdefc2f70e029b0e9ebd7be933b9a7dd58b80fb3 Mon Sep 17 00:00:00 2001
From: Tom Hulton-Harrop <tom.hultonharrop@gmail.com>
Date: Thu, 30 Mar 2023 22:56:46 +0100
Subject: [PATCH] add const overload for GetPoint

Signed-off-by: Tom Hulton-Harrop <tom.hultonharrop@gmail.com>
---
 poly2tri/common/shapes.h | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/poly2tri/common/shapes.h b/poly2tri/common/shapes.h
index d78aa87..b6ade60 100644
--- a/poly2tri/common/shapes.h
+++ b/poly2tri/common/shapes.h
@@ -161,6 +161,7 @@ bool constrained_edge[3];
 bool delaunay_edge[3];
 
 Point* GetPoint(int index);
+const Point* GetPoint(int index) const;
 Point* PointCW(const Point& point);
 Point* PointCCW(const Point& point);
 Point* OppositePoint(Triangle& t, const Point& p);
@@ -288,11 +289,17 @@ inline Point Cross(double s, const Point& a)
   return Point(-s * a.y, s * a.x);
 }
 
-inline Point* Triangle::GetPoint(int index)
+inline const Point* Triangle::GetPoint(int index) const
 {
   return points_[index];
 }
 
+inline Point* Triangle::GetPoint(int index)
+{
+  return const_cast<Point*>(
+      static_cast<const Triangle&>(*this).GetPoint(index));
+}
+
 inline Triangle* Triangle::GetNeighbor(int index)
 {
   return neighbors_[index];