Module joints 

Joint builders and creation helpers (modularized).

Two creation styles are available:

• Scoped handles: World::create_*_joint(&def) -> Joint returning a scoped handle for immediate configuration/queries. Dropping the handle does not destroy the joint.
• Owned handles: World::create_*_joint_owned(&def) -> OwnedJoint or World::*().build_owned() -> OwnedJoint returning a RAII handle that destroys the joint on drop.
• ID style: World::create_*_joint_id(&def) -> b2JointId returning the raw id for storage.

The World convenience builders (revolute, prismatic, wheel, distance, weld, motor_joint, filter_joint) help compose joints in world space and build local frames from world anchors/axes.

Structs

ConstraintTuning

Shared constraint tuning (Hertz + damping ratio) used by Box2D joints.

DistanceJointBuilder

Fluent builder for distance joints working in world space.

DistanceJointDef

Distance joint definition (maps to b2DistanceJointDef).

FilterJointBuilder

Builder for a filter joint that disables collision between two bodies while keeping them in the same island. Fluent builder for filter joints.

FilterJointDef

Filter joint definition (maps to b2FilterJointDef). A lightweight joint used primarily for contact filtering scenarios.

Joint

A scoped joint handle tied to a mutable borrow of the world.

JointBase

Base joint definition builder for common properties.

JointBaseBuilder

MotorJointBuilder

Fluent builder for motor joints.

MotorJointDef

Motor joint definition (maps to b2MotorJointDef). Drives relative motion between two bodies using linear and angular offsets with configurable maximum forces.

OwnedJoint

A RAII-owned joint that is destroyed on drop.

PrismaticJointBuilder

Builder for a prismatic joint in world space. Fluent builder for prismatic joints using world anchors and axis.

PrismaticJointDef

Prismatic (slider) joint definition (maps to b2PrismaticJointDef).

RevoluteJointBuilder

Builder for a revolute (hinge) joint in world space. Fluent builder for revolute joints using a world anchor.

RevoluteJointDef

Revolute (hinge) joint definition (maps to b2RevoluteJointDef).

WeldJointBuilder

Fluent builder for weld joints using a world anchor.

WeldJointDef

Weld joint definition (maps to b2WeldJointDef). Rigidly attaches two bodies at an anchor with optional soft-constraint tuning.

WheelJointBuilder

Fluent builder for wheel joints using world anchors and axis.

WheelJointDef

Wheel (suspension) joint definition (maps to b2WheelJointDef).

Enums

JointType

Joint kinds reported by Box2D.