Add 2D convex polygon body

libs/cg/include/psemek/cg/body/polygon.hpp

@@ -0,0 +1,47 @@
+#pragma once
+
+#include <psemek/geom/simplex.hpp>
+#include <psemek/cg/body/body.hpp>
+
+#include <vector>
+
+namespace psemek::cg
+{
+
+	template <typename T>
+	struct polygon
+	{
+		polygon(std::vector<geom::point<T, 2>> vertices);
+
+		std::vector<geom::point<T, 2>> vertices;
+		std::vector<geom::segment<std::size_t>> edges;
+	};
+
+	template <typename T>
+	polygon<T>::polygon(std::vector<geom::point<T, 2>> vertices)
+		: vertices(std::move(vertices))
+	{
+		edges.resize(vertices.size());
+		for (std::size_t i = 0; i < vertices.size(); ++i)
+			edges[i].points = {i, (i + 1) % vertices.size()};
+	}
+
+	template <typename T>
+	constexpr std::size_t dimension(polygon<T> const &)
+	{
+		return 2;
+	}
+
+	template <typename T>
+	auto const & vertices(polygon<T> const & p)
+	{
+		return p.vertices;
+	}
+
+	template <typename T>
+	auto const & edges(polygon<T> const & p)
+	{
+		return p.edges;
+	}
+
+}