body_2d.h

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#pragma once
 
#include <box2d/box2d.h>
#include <engine/physics/world/body/body_type_2d.h>
#include <engine/physics/world/body/shape_type_2d.h>
#include <engine/public/util/point.h>
#include <engine/public/util/vector3.h>
 
#include <vector>
 
struct Shape2D {
  b2ShapeId id{};
  b2ShapeType type{};
};
 
struct Body2D {
  b2BodyId id{};
  std::vector<Shape2D> shapes;
 
  static struct Body2DTransform get_body_transform(const Body2D& body);
 
  static struct Body2DTransform get_pixel_transform(const Body2D& body);
 
  static void set_body_transform(const struct Body2DTransform& transform,
                                 bool in_pixels = false);
 
  static void set_body_type(const Body2D& body, BodyType2D::Type type);
 
  static void set_body_gravity_scale(const Body2D& body, float scale);
 
  static void set_body_mass(const Body2D& body, float mass);
 
  static void set_body_size(const Body2D& body, const Vector3& size,
                            Point offset);
 
  static void set_body_radius(const Body2D& body, float radius, Point offset);
 
  static void set_body_bounciness(const Body2D& body, float bounciness,
                                  ShapeType2D::Type type);
 
  static void set_body_friction(const Body2D& body, float friction,
                                ShapeType2D::Type type);
 
  static void set_body_velocity(const Body2D& body,
                                const Vector3& velocity) noexcept;
 
  static void apply_force(const Body2D& body, const Vector3& force) noexcept;
 
  static void apply_impulse(const Body2D& body,
                            const Vector3& impulse) noexcept;
 
  static Vector3 get_body_velocity(const Body2D& body) noexcept;
};
 
struct Body2DTransform {
  Body2D body;
  Vector3 position;
  float rotation{0.0f};
  Vector3 center_of_mass{0.0f, 0.0f, 0.0f};
};