polygon.h

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#pragma once
#include "vde/core/point.h"
#include "vde/core/aabb.h"
#include <vector>
#include <array>
 
namespace vde::core {
 
class Polygon2D {
public:
    Polygon2D() = default;
 
    explicit Polygon2D(std::vector<Point2D> vertices) : vertices_(std::move(vertices)) {}
 
    [[nodiscard]] const std::vector<Point2D>& vertices() const { return vertices_; }
    [[nodiscard]] size_t size() const { return vertices_.size(); }
    [[nodiscard]] bool empty() const { return vertices_.empty(); }
 
    [[nodiscard]] double signed_area() const;
 
    [[nodiscard]] double area() const { return std::abs(signed_area()); }
 
    [[nodiscard]] double perimeter() const;
 
    [[nodiscard]] Point2D centroid() const;
 
    [[nodiscard]] AABB<double> bounding_box() const;
 
    [[nodiscard]] bool contains(const Point2D& p) const;
 
    [[nodiscard]] bool is_ccw() const { return signed_area() > 0; }
 
    [[nodiscard]] Polygon2D simplify(double tolerance) const;
 
    [[nodiscard]] std::vector<std::array<int, 3>> triangulate() const;
 
    static Polygon2D convex_hull_2d(const std::vector<Point2D>& points);
 
private:
    std::vector<Point2D> vertices_;
};
 
}  // namespace vde::core