CollisionHandler Class Reference

Class responsible for collision detection and handling. More...

#include <CollisionHandler.h>

Public Member Functions
template<typename T>
T	getAnyIntersection (Entity *entity, Vector2D posMod={}, std::initializer_list< Entity::GroupLabel > const &groupLabels={}, std::initializer_list< Entity * > const &excludedEntities={})
	Tests entity against all entities with the specified labels for a collision.
template<>
IntersectionBitSet	getAnyIntersection (Entity *entity, Vector2D posMod, std::initializer_list< Entity::GroupLabel > const &groupLabels, std::initializer_list< Entity * > const &excludedEntities)
template<>
Entity *	getAnyIntersection (Entity *entity, Vector2D posMod, std::initializer_list< Entity::GroupLabel > const &groupLabels, std::initializer_list< Entity * > const &excludedEntities)
template<>
bool	getAnyIntersection (Entity *entity, Vector2D posMod, std::initializer_list< Entity::GroupLabel > const &groupLabels, std::initializer_list< Entity * > const &excludedEntities)

Static Public Member Functions
static IntersectionBitSet	getIntersection (Entity *entityA, Entity *entityB, Vector2D posModA=Vector2D(0, 0), Vector2D posModB=Vector2D(0, 0))
	Checks for intersections relative to entityA.

Detailed Description

Class responsible for collision detection and handling.

Member Function Documentation

getAnyIntersection() [1/4]

template<>

IntersectionBitSet CollisionHandler::getAnyIntersection	(	Entity *	entity,
		Vector2D	posMod,
		std::initializer_list< Entity::GroupLabel > const &	groupLabels,
		std::initializer_list< Entity * > const &	excludedEntities )

Refer to getAnyIntersection() for more details

Returns

A bitset of intersections, describing the directions of intersection. Position Direction in bitset true if edge in that direction collides

See also

Direction

IntersectionBitSet

constexpr uint8_t DIRECTION_C = 4;
 
using IntersectionBitSet = std::bitset<DIRECTION_C>;

Example usage for IntersectionBitSet (TransformComponent::update()):

IntersectionBitSet intersections =
    (CollisionHandler::getIntersectionWithBounds(entity, Vector2D(positionChange.x, 0)) |
        (this->entity->getManager()
        .getGame()->collisionHandler->getAnyIntersection<IntersectionBitSet>(entity, Vector2D(positionChange.x, 0), colliders)) &
        IntersectionBitSet("0011")) |
    (CollisionHandler::getIntersectionWithBounds(entity, Vector2D(0, positionChange.y)) |
        (this->entity->getManager()
        .getGame()->collisionHandler->getAnyIntersection<IntersectionBitSet>(entity, Vector2D(0, positionChange.y), colliders)) &
        IntersectionBitSet("1100"));
 
if (intersections.test((size_t)Direction::LEFT) || intersections.test((size_t)Direction::RIGHT))
    positionChange.x = 0;
 
if (intersections.test((size_t)Direction::UP) || intersections.test((size_t)Direction::DOWN))
    positionChange.y = 0;

getAnyIntersection() [2/4]

template<>

Entity * CollisionHandler::getAnyIntersection	(	Entity *	entity,
		Vector2D	posMod,
		std::initializer_list< Entity::GroupLabel > const &	groupLabels,
		std::initializer_list< Entity * > const &	excludedEntities )

Refer to getAnyIntersection() for more details

Returns

The first entity with collision found

See also

Entity

getAnyIntersection() [3/4]

template<>

bool CollisionHandler::getAnyIntersection	(	Entity *	entity,
		Vector2D	posMod,
		std::initializer_list< Entity::GroupLabel > const &	groupLabels,
		std::initializer_list< Entity * > const &	excludedEntities )

Refer to getAnyIntersection() for more details

Returns

True if any collision was found, otherwise false

getAnyIntersection() [4/4]

template<typename T>

T CollisionHandler::getAnyIntersection	(	Entity *	entity,
		Vector2D	posMod = {},
		std::initializer_list< Entity::GroupLabel > const &	groupLabels = {},
		std::initializer_list< Entity * > const &	excludedEntities = {} )

Tests entity against all entities with the specified labels for a collision.

Tests the given entity against every other entity with the specified labels for intersections between their collison boxes. If the primary entity has no ColliderComponent, the equivalent of no collision is returned immediately, other entities are skipped if they don't have a ColliderComponent

Parameters

entity	The primary entity to check against. Return values will be relative to this entity
posMod	Modifier to apply toposition before checking collisions.
groupLabels	Entities need to have at least one listed GroupLabels to get checked against
teamLabels	Entities need to have one of the specified TeamLabels to get checked against
negateTeam	If set to true, entities will only be checked against if they don't have one of the specified TeamLabels

See also

ColliderComponent

getIntersection()

IntersectionBitSet CollisionHandler::getIntersection ( Entity * entityA, Entity * entityB, Vector2D posModA = Vector2D(0,0), Vector2D posModB = Vector2D(0,0) )

static

Checks for intersections relative to entityA.

Parameters

entityA	The first entity to check against
entityB	The second entity to check against
posModA	Modifier to apply to entityA's position before checking collisions

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The documentation for this class was generated from the following files:

• include/CollisionHandler.h
• src/CollisionHandler.cpp