b2Collision.h File Reference

#include <Box2D/Common/b2Math.h>
#include <limits.h>

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Classes
struct	b2AABB
	An axis aligned bounding box. More...
struct	b2ClipVertex
	Used for computing contact manifolds. More...
struct	b2ContactFeature
union	b2ContactID
	Contact ids to facilitate warm starting. More...
struct	b2Manifold
struct	b2ManifoldPoint
struct	b2RayCastInput
	Ray-cast input data. The ray extends from p1 to p1 + maxFraction * (p2 - p1). More...
struct	b2RayCastOutput
struct	b2WorldManifold
	This is used to compute the current state of a contact manifold. More...
Enumerations
enum	b2PointState { b2_nullState, b2_addState, b2_persistState, b2_removeState }
	This is used for determining the state of contact points. More...
Functions
int32	b2ClipSegmentToLine (b2ClipVertex vOut[2], const b2ClipVertex vIn[2], const b2Vec2 &normal, float32 offset, int32 vertexIndexA)
	Clipping for contact manifolds.
void	b2CollideCircles (b2Manifold *manifold, const b2CircleShape *circleA, const b2Transform &xfA, const b2CircleShape *circleB, const b2Transform &xfB)
	Compute the collision manifold between two circles.
void	b2CollideEdgeAndCircle (b2Manifold *manifold, const b2EdgeShape *polygonA, const b2Transform &xfA, const b2CircleShape *circleB, const b2Transform &xfB)
	Compute the collision manifold between an edge and a circle.
void	b2CollideEdgeAndPolygon (b2Manifold *manifold, const b2EdgeShape *edgeA, const b2Transform &xfA, const b2PolygonShape *circleB, const b2Transform &xfB)
	Compute the collision manifold between an edge and a circle.
void	b2CollidePolygonAndCircle (b2Manifold *manifold, const b2PolygonShape *polygonA, const b2Transform &xfA, const b2CircleShape *circleB, const b2Transform &xfB)
	Compute the collision manifold between a polygon and a circle.
void	b2CollidePolygons (b2Manifold *manifold, const b2PolygonShape *polygonA, const b2Transform &xfA, const b2PolygonShape *polygonB, const b2Transform &xfB)
	Compute the collision manifold between two polygons.
void	b2GetPointStates (b2PointState state1[b2_maxManifoldPoints], b2PointState state2[b2_maxManifoldPoints], const b2Manifold *manifold1, const b2Manifold *manifold2)
bool	b2TestOverlap (const b2Shape *shapeA, int32 indexA, const b2Shape *shapeB, int32 indexB, const b2Transform &xfA, const b2Transform &xfB)
	Determine if two generic shapes overlap.
bool	b2TestOverlap (const b2AABB &a, const b2AABB &b)
Variables
const uint8	b2_nullFeature = UCHAR_MAX

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Detailed Description

Structures and functions used for computing contact points, distance queries, and TOI queries.

Definition in file b2Collision.h.

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Enumeration Type Documentation

enum b2PointState

This is used for determining the state of contact points.

Enumerator:

b2_nullState	point does not exist
b2_addState	point was added in the update
b2_persistState	point persisted across the update
b2_removeState	point was removed in the update

Definition at line 126 of file b2Collision.h.

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Function Documentation

int32 b2ClipSegmentToLine	(	b2ClipVertex	vOut[2],
		const b2ClipVertex	vIn[2],
		const b2Vec2 &	normal,
		float32	offset,
		int32	vertexIndexA
	)

Clipping for contact manifolds.

Definition at line 201 of file b2Collision.cpp.

void b2CollideCircles	(	b2Manifold *	manifold,
		const b2CircleShape *	circleA,
		const b2Transform &	xfA,
		const b2CircleShape *	circleB,
		const b2Transform &	xfB
	)

Compute the collision manifold between two circles.

Definition at line 23 of file b2CollideCircle.cpp.

void b2CollideEdgeAndCircle	(	b2Manifold *	manifold,
		const b2EdgeShape *	polygonA,
		const b2Transform &	xfA,
		const b2CircleShape *	circleB,
		const b2Transform &	xfB
	)

Compute the collision manifold between an edge and a circle.

Definition at line 27 of file b2CollideEdge.cpp.

void b2CollideEdgeAndPolygon	(	b2Manifold *	manifold,
		const b2EdgeShape *	edgeA,
		const b2Transform &	xfA,
		const b2PolygonShape *	circleB,
		const b2Transform &	xfB
	)

Compute the collision manifold between an edge and a circle.

Definition at line 692 of file b2CollideEdge.cpp.

void b2CollidePolygonAndCircle	(	b2Manifold *	manifold,
		const b2PolygonShape *	polygonA,
		const b2Transform &	xfA,
		const b2CircleShape *	circleB,
		const b2Transform &	xfB
	)

Compute the collision manifold between a polygon and a circle.

Definition at line 51 of file b2CollideCircle.cpp.

void b2CollidePolygons	(	b2Manifold *	manifold,
		const b2PolygonShape *	polygonA,
		const b2Transform &	xfA,
		const b2PolygonShape *	polygonB,
		const b2Transform &	xfB
	)

Compute the collision manifold between two polygons.

Definition at line 116 of file b2CollidePolygon.cpp.

void b2GetPointStates	(	b2PointState	state1[b2_maxManifoldPoints],
		b2PointState	state2[b2_maxManifoldPoints],
		const b2Manifold *	manifold1,
		const b2Manifold *	manifold2
	)

Compute the point states given two manifolds. The states pertain to the transition from manifold1 to manifold2. So state1 is either persist or remove while state2 is either add or persist.

Definition at line 88 of file b2Collision.cpp.

bool b2TestOverlap	(	const b2Shape *	shapeA,
		int32	indexA,
		const b2Shape *	shapeB,
		int32	indexB,
		const b2Transform &	xfA,
		const b2Transform &	xfB
	)

Determine if two generic shapes overlap.

Definition at line 233 of file b2Collision.cpp.

bool b2TestOverlap	(	const b2AABB &	a,
		const b2AABB &	b
	)		[inline]

Definition at line 262 of file b2Collision.h.

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Variable Documentation

const uint8 b2_nullFeature = UCHAR_MAX

Definition at line 34 of file b2Collision.h.