| Box2D 2.2.1 A 2D Physics Engine for Games

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Public Member Functions | Public Attributes
b2DistanceJointDef Struct Reference

`#include <b2DistanceJoint.h>`

Inheritance diagram for b2DistanceJointDef:

List of all members.

## Public Member Functions

void | Initialize (b2Body *bodyA, b2Body *bodyB, const b2Vec2 &anchorA, const b2Vec2 &anchorB)

## Public Attributes

b2Vec2 | localAnchorA
| The local anchor point relative to bodyA's origin.
b2Vec2 | localAnchorB
| The local anchor point relative to bodyB's origin.
float32 | length
| The natural length between the anchor points.
float32 | frequencyHz
float32 | dampingRatio
| The damping ratio. 0 = no damping, 1 = critical damping.

## Detailed Description

Distance joint definition. This requires defining an anchor point on both bodies and the non-zero length of the distance joint. The definition uses local anchor points so that the initial configuration can violate the constraint slightly. This helps when saving and loading a game.

Warning:
  Do not use a zero or short length.

## Member Function Documentation

void b2DistanceJointDef::Initialize | ( | b2Body * | bodyA,
|  | b2Body * | bodyB,
|  | const b2Vec2 & | anchorA,
|  | const b2Vec2 & | anchorB
| ) |  |

Initialize the bodies, anchors, and length using the world anchors.

## Member Data Documentation

float32 b2DistanceJointDef::frequencyHz

The mass-spring-damper frequency in Hertz. A value of 0 disables softness.

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

- b2DistanceJoint.h
- b2DistanceJoint.cpp

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