Move basic setHeights lambdas into proper helper functions

1 files changed, 24 insertions, 0 deletions

diff --git a/game/geoDataMesh.cpp b/game/geoDataMesh.cpp
index aaa8c9c..687a025 100644
--- a/game/geoDataMesh.cpp
+++ b/game/geoDataMesh.cpp
@@ -116,3 +116,27 @@ GeoDataMesh::sanityCheck(const std::source_location & loc) const
 				"{} upside down faces detected - checked from {}:{}", upSideDown, loc.function_name(), loc.line()));
 	}
 }
+
+bool
+GeoDataMesh::canFlip(const HalfedgeHandle edge) const
+{
+	const auto opposite = opposite_halfedge_handle(edge);
+	const auto pointA = point(to_vertex_handle(edge));
+	const auto pointB = point(to_vertex_handle(opposite));
+	const auto pointC = point(to_vertex_handle(next_halfedge_handle(edge)));
+	const auto pointD = point(to_vertex_handle(next_halfedge_handle(opposite)));
+
+	return Triangle<2> {pointC, pointB, pointD}.isUp() && Triangle<2> {pointA, pointC, pointD}.isUp();
+};
+
+std::optional<OpenMesh::EdgeHandle>
+GeoDataMesh::shouldFlip(const HalfedgeHandle next, const GlobalPosition2D startPoint) const
+{
+	if (const auto nextEdge = edge_handle(next); is_flip_ok(nextEdge) && canFlip(next)) {
+		const auto oppositePoint = point(to_vertex_handle(next_halfedge_handle(opposite_halfedge_handle(next)))).xy();
+		if (distance<2>(startPoint, oppositePoint) < length<2>(next)) {
+			return nextEdge;
+		}
+	}
+	return std::nullopt;
+};