collider.hpp

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/*
  Wizard Engine
  Copyright (C) 2023-2024 Zana Domán
 
  This software is provided 'as-is', without any express or implied
  warranty. In no event will the authors be held liable for any damages
  arising from the use of this software.
 
  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely, subject to the following restrictions:
 
  1. The origin of this software must not be misrepresented; you must not
     claim that you wrote the original software. If you use this software
     in a product, an acknowledgment in the product documentation would be
     appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be
     misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.
*/
 
#ifndef WIZARD_ENGINE_COLLIDER_HPP
#define WIZARD_ENGINE_COLLIDER_HPP
 
#include <wizard_engine/entity.hpp>
#include <wizard_engine/export.hpp>
#include <wizard_engine/math.hpp>
#include <wizard_engine/polygon.hpp>
 
namespace wze {
/*
 * @file collider.hpp
 * @author Zana Domán
 * @brief Rigid entity.
 */
class collider : public entity {
  private:
    static std::array<std::vector<collider*>,
                      std::numeric_limits<uint8_t>::max()>
        _worlds;
    polygon _body;
    float _force;
    float _mass;
    uint8_t _world;
 
    template <void (collider::*static_resolver)(collider const&),
              bool (collider::*dynamic_resolver)(collider&, float)>
    // NOLINTNEXTLINE(misc-no-recursion)
    void push(float force) {
        std::vector<collider*> contacts;
 
        contacts = collider::contacts();
        if (contacts.empty()) {
            return;
        }
 
        force -= contacts_mass(contacts);
        if (0 < force) {
            std::for_each(
                contacts.begin(), contacts.end(),
                // NOLINTNEXTLINE(misc-no-recursion)
                [=](collider* contact) -> void {
                    if ((this->*dynamic_resolver)(*contact,
                                                  contact->mass() + force)) {
                        contact->push<static_resolver, dynamic_resolver>(force);
                        (this->*static_resolver)(*contact);
                    }
                });
        } else {
            std::for_each(contacts.begin(), contacts.end(),
                          [=](collider const* contact) -> void {
                              (this->*static_resolver)(*contact);
                          });
        }
    }
 
    [[nodiscard]] std::vector<collider*> contacts() const;
 
    [[nodiscard]] static float
    contacts_mass(std::vector<collider*> const& contacts);
 
    template <float (polygon::*position)() const,
              void (polygon::*set_position)(float)>
    void solo_static_resolver(collider const& other) {
        float collision;
 
        collision = body().overlap<float>(other.body());
        if (!(bool)collision) {
            return;
        }
 
        collision += math::epsilon();
        (_body.*set_position)((body().*position)() +
                              ((body().*position)() < (other.body().*position)()
                                   ? -collision
                                   : collision));
    }
 
    template <float (polygon::*position)() const,
              void (polygon::*set_position)(float)>
    [[nodiscard]] bool solo_dynamic_resolver(collider& other, float force) {
        float collision;
        std::pair<float, float> movement;
 
        collision = body().overlap<float>(other.body());
        if (!(bool)collision) {
            return false;
        }
 
        movement = dynamic_movement(collision, force, other.mass());
        if ((body().*position)() < (other.body().*position)()) {
            (_body.*set_position)((body().*position)() - movement.first);
            (other._body.*set_position)((other.body().*position)() +
                                        movement.second);
        } else {
            (_body.*set_position)((body().*position)() + movement.first);
            (other._body.*set_position)((other.body().*position)() -
                                        movement.second);
        }
 
        return true;
    }
 
    void dual_static_resolver(collider const& other);
 
    [[nodiscard]] bool dual_dynamic_resolver(collider& other, float force);
 
    static std::pair<float, float> dynamic_movement(float collision,
                                                    float force, float mass);
 
    void align_entities() const;
 
  public:
    [[nodiscard]] polygon const& body() const;
 
    void set_body(polygon const& body);
 
    [[nodiscard]] float force() const;
 
    void set_force(float force);
 
    [[nodiscard]] float mass() const;
 
    void set_mass(float mass);
 
    [[nodiscard]] uint8_t world() const;
 
    void set_world(uint8_t world);
 
    [[nodiscard]] float x() const final;
 
    void set_x(float x) final;
 
    [[nodiscard]] float y() const final;
 
    void set_y(float y) final;
 
    [[nodiscard]] float angle() const final;
 
    void set_angle(float angle) final;
 
    [[nodiscard]] float scale() const;
 
    void set_scale(float scale);
 
    [[nodiscard]] float x_offset() const final;
 
    void set_x_offset(float x_offset) final;
 
    [[nodiscard]] float y_offset() const final;
 
    void set_y_offset(float y_offset) final;
 
    [[nodiscard]] float angle_offset() const final;
 
    void set_angle_offset(float angle_offset) final;
 
    [[nodiscard]] bool attach_x() const final;
 
    void set_attach_x(bool attach_x) final;
 
    [[nodiscard]] bool attach_y() const final;
 
    void set_attach_y(bool attach_y) final;
 
    [[nodiscard]] bool attach_angle() const final;
 
    void set_attach_angle(bool attach_angle) final;
 
    [[nodiscard]] bool x_angle_lock() const final;
 
    void set_x_angle_lock(bool x_angle_lock) final;
 
    [[nodiscard]] bool y_angle_lock() const final;
 
    void set_y_angle_lock(bool y_angle_lock) final;
 
    explicit collider(
        polygon const& body = polygon(), float force = 0, float mass = 0,
        uint8_t world = std::numeric_limits<uint8_t>::max(),
        std::vector<std::weak_ptr<component>> const& components = {});
 
    collider(collider const& other);
 
    ~collider() override;
 
    collider& operator=(collider const& other);
};
} /* namespace wze */
 
#endif /* WIZARD_ENGINE_COLLIDER_HPP */