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Change IsPointInPolygon to check polygon with equal points correctly

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This commit is contained in:
AdenKoperczak 2025-02-09 13:07:42 -05:00
parent 0043283881
commit e43c0594d1
1 changed files with 9 additions and 0 deletions
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9
scwx-qt/source/scwx/qt/util/maplibre.cpp
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@ -47,6 +47,7 @@ bool IsPointInPolygon(const std::vector<glm::vec2>& vertices,
const glm::vec2& point) const glm::vec2& point)
{ {
bool inPolygon = true; bool inPolygon = true;
bool allSame = true;
// For each vertex, assume counterclockwise order // For each vertex, assume counterclockwise order
for (std::size_t i = 0; i < vertices.size(); ++i) 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 = const auto& p2 =
(i == vertices.size() - 1) ? vertices[0] : vertices[i + 1]; (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 // Test which side of edge point lies on
const float a = -(p2.y - p1.y); const float a = -(p2.y - p1.y);
const float b = p2.x - p1.x; 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; return inPolygon;
} }