Box2D 2.3.0 A 2D Physics Engine for Games

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b2BroadPhase Class Reference

`#include <b2BroadPhase.h>`

## Public Types
enum | { e_nullProxy = -1 }

## Public Member Functions
int32 | CreateProxy (const b2AABB &aabb, void *userData)
void | DestroyProxy (int32 proxyId)
| Destroy a proxy. It is up to the client to remove any pairs.
void | MoveProxy (int32 proxyId, const b2AABB &aabb, const b2Vec2 &displacement)
void | TouchProxy (int32 proxyId)
| Call to trigger a re-processing of it's pairs on the next call to UpdatePairs.
const b2AABB & | GetFatAABB (int32 proxyId) const
| Get the fat AABB for a proxy.
void * | GetUserData (int32 proxyId) const
| Get user data from a proxy. Returns NULL if the id is invalid.
bool | TestOverlap (int32 proxyIdA, int32 proxyIdB) const
| Test overlap of fat AABBs.
int32 | GetProxyCount () const
| Get the number of proxies.
template<typename T >
void | UpdatePairs (T *callback)
| Update the pairs. This results in pair callbacks. This can only add pairs.
template<typename T >
void | Query (T *callback, const b2AABB &aabb) const
template<typename T >
void | RayCast (T *callback, const b2RayCastInput &input) const
int32 | GetTreeHeight () const
| Get the height of the embedded tree.
int32 | GetTreeBalance () const
| Get the balance of the embedded tree.
float32 | GetTreeQuality () const
| Get the quality metric of the embedded tree.
void | ShiftOrigin (const b2Vec2 &newOrigin)

## Friends
class | b2DynamicTree

## Detailed Description

The broad-phase is used for computing pairs and performing volume queries and ray casts. This broad-phase does not persist pairs. Instead, this reports potentially new pairs. It is up to the client to consume the new pairs and to track subsequent overlap.

## Member Function Documentation

int32 b2BroadPhase::CreateProxy | ( | const b2AABB & | aabb,
|  | void * | userData
| ) |  |

Create a proxy with an initial AABB. Pairs are not reported until UpdatePairs is called.

void b2BroadPhase::MoveProxy | ( | int32 | proxyId,
|  | const b2AABB & | aabb,
|  | const b2Vec2 & | displacement
| ) |  |

Call MoveProxy as many times as you like, then when you are done call UpdatePairs to finalized the proxy pairs (for your time step).

template<typename T >

void b2BroadPhase::Query | ( | T * | callback,
|  | const b2AABB & | aabb
| ) |  | const
| inline

Query an AABB for overlapping proxies. The callback class is called for each proxy that overlaps the supplied AABB.

template<typename T >

void b2BroadPhase::RayCast | ( | T * | callback,
|  | const b2RayCastInput & | input
| ) |  | const
| inline

Ray-cast against the proxies in the tree. This relies on the callback to perform a exact ray-cast in the case were the proxy contains a shape. The callback also performs the any collision filtering. This has performance roughly equal to k * log(n), where k is the number of collisions and n is the number of proxies in the tree.

Parameters

  input | the ray-cast input data. The ray extends from p1 to p1 + maxFraction * (p2 - p1).
  callback | a callback class that is called for each proxy that is hit by the ray.

void b2BroadPhase::ShiftOrigin | ( | const b2Vec2 & | newOrigin | ) |
| inline

Shift the world origin. Useful for large worlds. The shift formula is: position -= newOrigin

Parameters

  newOrigin | the new origin with respect to the old origin

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

- b2BroadPhase.h
- b2BroadPhase.cpp