From e43c0594d1469db254e044e145b21d42a7cd3186 Mon Sep 17 00:00:00 2001
From: AdenKoperczak <awkoperczak@gmail.com>
Date: Sun, 9 Feb 2025 13:07:42 -0500
Subject: [PATCH] Change IsPointInPolygon to check polygon with equal points
 correctly

---
 scwx-qt/source/scwx/qt/util/maplibre.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/scwx-qt/source/scwx/qt/util/maplibre.cpp b/scwx-qt/source/scwx/qt/util/maplibre.cpp
index 3414af41..5ff8b4ef 100644
--- a/scwx-qt/source/scwx/qt/util/maplibre.cpp
+++ b/scwx-qt/source/scwx/qt/util/maplibre.cpp
@@ -47,6 +47,7 @@ bool IsPointInPolygon(const std::vector<glm::vec2>& vertices,
                       const glm::vec2&              point)
 {
    bool inPolygon = true;
+   bool allSame = true;
 
    // For each vertex, assume counterclockwise order
    for (std::size_t i = 0; i < vertices.size(); ++i)
@@ -55,6 +56,8 @@ bool IsPointInPolygon(const std::vector<glm::vec2>& vertices,
       const auto& p2 =
          (i == vertices.size() - 1) ? vertices[0] : vertices[i + 1];
 
+      allSame = allSame && p1.x == p2.x && p1.y == p2.y;
+
       // Test which side of edge point lies on
       const float a = -(p2.y - p1.y);
       const float b = p2.x - p1.x;
@@ -70,6 +73,12 @@ bool IsPointInPolygon(const std::vector<glm::vec2>& vertices,
       }
    }
 
+   if (allSame)
+   {
+      inPolygon = vertices.size() > 0 && vertices[0].x == point.x &&
+                  vertices[0].y == point.y;
+   }
+
    return inPolygon;
 }