nvec2.hpp

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#pragma once
#include <glm/gtx/norm.hpp>
#include <glm/trigonometric.hpp>
#include <glm/vec2.hpp>
 
namespace le {
inline constexpr auto right_v = glm::vec2{1.0f, 0.0f};
inline constexpr auto up_v = glm::vec2{0.0f, 1.0f};
 
class nvec2 : public glm::vec2 {
  public:
    [[nodiscard]] static auto normal_or(glm::vec2 xy, glm::vec2 fallback) -> nvec2;
 
    explicit(false) nvec2(glm::vec2 xy = right_v);
    explicit(false) nvec2(float x, float y) : nvec2(glm::vec2{x, y}) {}
 
    [[nodiscard]] auto operator-() const -> nvec2 { return {InPlace{}, {-x, -y}}; }
 
    [[nodiscard]] static auto from_radians(float r) -> nvec2;
    [[nodiscard]] auto to_radians() const -> float;
 
    [[nodiscard]] auto rotated(float radians) const -> nvec2;
    void rotate(float radians);
 
  private:
    struct InPlace {};
    nvec2(InPlace /*d*/, glm::vec2 const xy) : glm::vec2(xy) {}
};
} // namespace le