DistanceJoint limiting the distance between two local anchor points of Bodies.

The equation for this constraint could be written like:

jointMin <= distance(body2.localPointToWorld(anchor2), body1.localPointToWorld(anchor1)) <= jointMaxThis joint is not designed to work when

` jointMin = jointMax = 0 `

and constraint is
stiff. In this instance you should use a PivotJoint instead.### Constructor

`new(body1:Null<Body>, body2:Null<Body>, anchor1:Vec2, anchor2:Vec2, jointMin:Float, jointMax:Float)`

Construct a new DistanceJoint.

Parameters:

`body1` | The first body in DistanceJoint. |
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`body2` | The second body in DistanceJoint. |

`anchor1` | The first local anchor for joint. |

`anchor2` | The second local anchor for joint. |

`jointMin` | The lower bound for constraint. |

`jointMax` | The upper bound for constraint. |

Returns:

The constructed DistanceJoint.

### Variables

`anchor1:Vec2`

Anchor point on first Body.

This anchor point is defined in the local coordinate system of body1.

`anchor2:Vec2`

Anchor point on second Body.

This anchor point is defined in the local coordinate system of body2.

`body1:Null<Body>`

First Body in constraint.

This value may be null, but trying to simulate the constraint whilst
this body is null will result in an error.

`body2:Null<Body>`

Second Body in constraint.

This value may be null, but trying to simulate the constraint whilst
this body is null will result in an error.

### Methods

`inlineisSlack():Bool`

Determine if constraint is slack.

This constraint is slack if the positional error is within
the bounds of (jointMin, jointMax).

Returns:

True if positional error of constraint is between the limits indicating that the constraint is not doing any work.

Throws:

`#` | If either of the bodies is null. |
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