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Diffstat (limited to 'src/crepe/system/CollisionSystem.h')
| -rw-r--r-- | src/crepe/system/CollisionSystem.h | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/src/crepe/system/CollisionSystem.h b/src/crepe/system/CollisionSystem.h index c1a70d8..44fff4e 100644 --- a/src/crepe/system/CollisionSystem.h +++ b/src/crepe/system/CollisionSystem.h @@ -1,13 +1,193 @@ #pragma once +#include <vector> +#include <variant> + +#include "api/Rigidbody.h" +#include "api/Transform.h" +#include "api/BoxCollider.h" +#include "api/CircleCollider.h" +#include "api/Vector2.h" + +#include "Collider.h" #include "System.h" namespace crepe { + +//! A system responsible for detecting and handling collisions between colliders. class CollisionSystem : public System { public: using System::System; +private: + + //! A variant type that can hold either a BoxCollider or a CircleCollider. + // using collider_stor = std::variant<BoxCollider, CircleCollider>; + using collider_stor = std::variant<std::reference_wrapper<BoxCollider>, std::reference_wrapper<CircleCollider>>; + + /** + * \brief A structure to store the collision data of a single collider. + * + * This structure stores the collider type, its associated transform, and its rigidbody. + */ + struct CollidedInfoStor { + //! Store either BoxCollider or CircleCollider + collider_stor collider; + Transform& transform; + Rigidbody& rigidbody; + }; + + //! Enum representing movement directions during collision resolution. + enum class Direction { + NONE, + X_DIRECTION, + Y_DIRECTION, + BOTH + }; + +public: + /** + * \brief A structure representing the collision information between two colliders. + * + * This structure contains both colliders, their associated transforms and rigidbodies, + * as well as the movement vector to resolve the collision. + */ + struct ColliderInfo { + const Collider& collider; + Transform& transform; + Rigidbody& rigidbody; + }; + /** + * \brief A structure representing detailed collision information between two colliders. + * + * This includes the movement data required to resolve the collision. + */ + struct CollisionInfo{ + ColliderInfo first; + ColliderInfo second; + vec2 move_back_value; + Direction move_back_direction = Direction::NONE; + }; + +public: + + //! Updates the collision system by checking for collisions between colliders and handling them. void update() override; + +private: + /** + * \brief Handles a collision between two colliders. + * + * This function calculates the necessary response to resolve the collision, including + * moving the objects back to prevent overlap and applying any velocity changes. + * + * \param data1 The collision data for the first collider. + * \param data2 The collision data for the second collider. + */ + void collision_handler(CollidedInfoStor& data1,CollidedInfoStor& data2); + + /** + * \brief Resolves the movement of two box colliders that are colliding. + * + * This function calculates the smallest overlap (along the X or Y axis) and determines + * the move-back vector to prevent overlap. + * + * \param box_collider1 The first box collider. + * \param box_collider2 The second box collider. + * \param final_position1 The final position of the first box collider. + * \param final_position2 The final position of the second box collider. + * \return The move-back vector to resolve the collision. + */ + vec2 box_box_collision_move_back(const BoxCollider& box_collider1,const BoxCollider& box_collider2,vec2 position1,vec2 position2); + + /** + * \brief Determines the appropriate collision handler based on the rigidbody types of the colliding objects. + * + * This function checks if the second object is static, and if so, it calls the static collision handler. + * Otherwise, it triggers a collision event. + * + * \param info The collision information containing the colliders, transforms, rigidbodies, and move-back data. + */ + void determine_collision_handler(CollisionInfo& info); + + /** + * \brief Handles the collision with a static object. + * + * This function resolves the collision by moving the object back and applying any bounce or stop behavior. + * + * \param info The collision information containing the colliders, transforms, rigidbodies, and move-back data. + */ + void static_collision_handler(CollisionInfo& info); +private: //detection + + /** + * \brief Checks for collisions between box colliders and circle colliders + * and returns the collision pairs that need to be resolved. + * + * \param boxcolliders A vector of references to all box colliders. + * \param circlecolliders A vector of references to all circle colliders. + * \return A vector of pairs containing collision information for the detected collisions. + */ + std::vector<std::pair<CollidedInfoStor,CollidedInfoStor>> check_collisions(const std::vector<std::reference_wrapper<BoxCollider>>& boxcolliders, const std::vector<std::reference_wrapper<CircleCollider>>& circlecolliders); + + /** + * \brief Checks for a collision between two box colliders. + * + * This function checks if two box colliders overlap based on their positions and dimensions. + * + * \param box1 The first box collider. + * \param box2 The second box collider. + * \param transform1 The transform component of the first box collider. + * \param transform2 The transform component of the second box collider. + * \param rigidbody1 The rigidbody component of the first box collider. + * \param rigidbody2 The rigidbody component of the second box collider. + * \return True if the two box colliders overlap, otherwise false. + */ + bool check_box_box_collision(const BoxCollider& box1, const BoxCollider& box2, const Transform& transform1, const Transform& transform2, const Rigidbody& rigidbody1, const Rigidbody& rigidbody2); + + /** + * \brief Checks for a collision between a box collider and a circle collider. + * + * This function checks if a box collider overlaps with a circle collider based on their positions + * and dimensions. + * + * \param box1 The box collider. + * \param circle2 The circle collider. + * \param transform1 The transform component of the box collider. + * \param transform2 The transform component of the circle collider. + * \param rigidbody1 The rigidbody component of the box collider. + * \param rigidbody2 The rigidbody component of the circle collider. + * \return True if the box collider and circle collider overlap, otherwise false. + */ + bool check_box_circle_collision(const BoxCollider& box1, const CircleCollider& circle2, const Transform& transform1, const Transform& transform2, const Rigidbody& rigidbody1, const Rigidbody& rigidbody2); + + /** + * \brief Checks for a collision between two circle colliders. + * + * This function checks if two circle colliders overlap based on their positions and radii. + * + * \param circle1 The first circle collider. + * \param circle2 The second circle collider. + * \param transform1 The transform component of the first circle collider. + * \param transform2 The transform component of the second circle collider. + * \param rigidbody1 The rigidbody component of the first circle collider. + * \param rigidbody2 The rigidbody component of the second circle collider. + * \return True if the two circle colliders overlap, otherwise false. + */ + bool check_circle_circle_collision(const CircleCollider& circle1, const CircleCollider& circle2, const Transform& transform1, const Transform& transform2, const Rigidbody& rigidbody1, const Rigidbody& rigidbody2); + + /** + * \brief Gets the current position of a collider by combining its transform and rigidbody data. + * + * This function calculates the current position of the collider by considering its transform and + * rigidbody velocity. + * + * \param collider The collider whose position is being determined. + * \param transform The transform component associated with the collider. + * \param rigidbody The rigidbody component associated with the collider. + * \return The current position of the collider as a vec2. + */ + vec2 current_position(const Collider& collider, const Transform& transform, const Rigidbody& rigidbody); }; } // namespace crepe |