b2

package module

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Versions in this module

v1

v1.1.0

Nov 7, 2026

Changes in this version

+ func IsDoublePrecision() bool

+ func IsValidPos(p Pos) bool

+ func IsValidRot(q Rot) bool

+ func IsValidTransform(t Transform) bool

+ func IsValidWorldTransform(t WorldTransform) bool

+ func StoreContactId(id ContactId) [3]uint32

+ func ValidateRecording(data []byte, workerCount int) bool

type AABB

+ func ComputeCapsuleBounds(shape *Capsule, xf WorldTransform) AABB

+ func ComputeCircleBounds(shape *Circle, xf WorldTransform) AABB

+ func ComputePolygonBounds(shape *Polygon, xf WorldTransform) AABB

+ func ComputeSegmentBounds(shape *Segment, xf WorldTransform) AABB

type BodyDef

+ EnableContactRecycling bool

+ MotionLocks MotionLocks

+ SafetyFactor Q

type BodyId

+ func (bodyId BodyId) ClearForces()

+ func (bodyId BodyId) ComputeBounds() AABB

+ func (bodyId BodyId) EnableContactRecycling(flag bool)

+ func (bodyId BodyId) EnableSleeping(enableSleep bool)

+ func (bodyId BodyId) GetLocalCenter() Vec2

+ func (bodyId BodyId) GetMaxExtent() Q

+ func (bodyId BodyId) GetMaxExtentFromOrigin() Q

+ func (bodyId BodyId) GetMinExtent() Q

+ func (bodyId BodyId) GetMotionLocks() MotionLocks

+ func (bodyId BodyId) GetSafetyFactor() Q

+ func (bodyId BodyId) GetWorldCenter() Pos

+ func (bodyId BodyId) IsContactRecyclingEnabled() bool

+ func (bodyId BodyId) IsSleepingEnabled() bool

+ func (bodyId BodyId) SetMotionLocks(locks MotionLocks)

+ func (bodyId BodyId) SetSafetyFactor(safetyFactor Q)

+ func (bodyId BodyId) UpdateMassFromShapes()

+ func (bodyId BodyId) WakeTouching()

+ type BoxCastInput struct

+ Box AABB

+ MaxFraction Q

+ Translation Vec2

type CastOutput

+ func CastRayCapsule(shape *Capsule, input *RayCastInput) CastOutput

+ func CastRayCircle(shape *Circle, input *RayCastInput) CastOutput

+ func CastRayPolygon(shape *Polygon, input *RayCastInput) CastOutput

+ func CastRaySegment(shape *Segment, input *RayCastInput, oneSided bool) CastOutput

+ func CastShapeCapsule(shape *Capsule, input *ShapeCastInput) CastOutput

+ func CastShapeCircle(shape *Circle, input *ShapeCastInput) CastOutput

+ func CastShapePolygon(shape *Polygon, input *ShapeCastInput) CastOutput

+ func CastShapeSegment(shape *Segment, input *ShapeCastInput) CastOutput

type ChainDef

+ Ghost1 Vec2

+ Ghost2 Vec2

type ChainId

+ func (chainId ChainId) GetSurfaceMaterial(segmentIndex int) SurfaceMaterial

+ func (chainId ChainId) SetAllSurfaceMaterials(material SurfaceMaterial)

+ func (chainId ChainId) SetSurfaceMaterial(material SurfaceMaterial, segmentIndex int)

type ContactBeginTouchEvent

+ ContactId ContactId

type ContactData

+ ContactId ContactId

type ContactEndTouchEvent

+ ContactId ContactId

type ContactHitEvent

+ ContactId ContactId

+ type ContactId struct

+ func LoadContactId(values [3]uint32) ContactId

+ func (contactId ContactId) GetData() ContactData

+ func (contactId ContactId) IsValid() bool

+ func (id ContactId) IsNull() bool

type Counters

+ AwakeContactCount int

+ RecycledContactCount int

type DebugDraw

+ DrawAnchorA bool

+ DrawBoundsFcn DrawBoundsFcn

+ DrawChainNormals bool

+ DrawCircleFcn DrawCircleFcn

+ DrawContactForces bool

+ DrawFrictionForces bool

+ DrawLineFcn DrawLineFcn

+ DrawPointFcn DrawPointFcn

+ DrawPolygonFcn DrawPolygonFcn

+ DrawSolidCapsuleFcn DrawSolidCapsuleFcn

+ DrawSolidCircleFcn DrawSolidCircleFcn

+ DrawSolidPolygonFcn DrawSolidPolygonFcn

+ DrawStringFcn DrawStringFcn

+ DrawTransformFcn DrawTransformFcn

+ ForceScale Q

+ JointScale Q

type DistanceInput

+ Transform Transform

type DistanceJointDef

+ Base JointDef

+ LowerSpringForce Q

+ UpperSpringForce Q

type DistanceOutput

+ func ComputeShapeDistance(input *DistanceInput, cache *SimplexCache, simplexes []Simplex) DistanceOutput

+ type DrawBoundsFcn func(aabb AABB, color HexColor)

+ type DrawLineFcn func(p1, p2 Pos, color HexColor)

type DynamicTree

+ func (t *DynamicTree) CastBox(input *BoxCastInput, maskBits uint64, fcn TreeBoxCastCallbackFcn) TreeStats

+ func (t *DynamicTree) CastRay(input *RayCastInput, maskBits uint64, fcn TreeRayCastCallbackFcn) TreeStats

+ func (t *DynamicTree) GetByteCount() int

+ func (t *DynamicTree) GetProxyBounds(proxyId int) AABB

+ func (t *DynamicTree) OverlapAABB(aabb AABB, maskBits uint64, fcn TreeQueryCallbackFcn) TreeStats

+ func (t *DynamicTree) OverlapAABBAll(aabb AABB, fcn TreeQueryCallbackFcn) TreeStats

type FilterJointDef

+ Base JointDef

+ type JointDef struct

+ BodyIdA BodyId

+ BodyIdB BodyId

+ CollideConnected bool

+ ConstraintDampingRatio Q

+ ConstraintHertz Q

+ DrawScale Q

+ ForceThreshold Q

+ LocalFrameA Transform

+ LocalFrameB Transform

+ TorqueThreshold Q

+ UserData any

+ type JointEvent struct

+ JointId JointId

+ UserData any

type JointId

+ func CreateMoverJoint(worldId WorldId, def *MoverJointDef) JointId

+ func CreatePogoJoint(worldId WorldId, def *PogoJointDef) JointId

+ func (jointId JointId) GetAngularVelocity() Q

+ func (jointId JointId) GetCurrentAngle() Q

+ func (jointId JointId) GetCurrentMotorForce() Q

+ func (jointId JointId) GetCurrentMotorTorque() Q

+ func (jointId JointId) GetCurrentSpeed() Q

+ func (jointId JointId) GetCurrentTranslation() Q

+ func (jointId JointId) GetForceThreshold() Q

+ func (jointId JointId) GetImpulse() Q

+ func (jointId JointId) GetLinearVelocity() Vec2

+ func (jointId JointId) GetLocalFrameA() Transform

+ func (jointId JointId) GetLocalFrameB() Transform

+ func (jointId JointId) GetMaxSpringForce() Q

+ func (jointId JointId) GetMaxSpringTorque() Q

+ func (jointId JointId) GetMaxVelocityForce() Q

+ func (jointId JointId) GetMaxVelocityTorque() Q

+ func (jointId JointId) GetMoverMaxVelocityForce() Vec2

+ func (jointId JointId) GetRestLength() Q

+ func (jointId JointId) GetSpringForce() Q

+ func (jointId JointId) GetSpringForceRange() (lowerForce, upperForce Q)

+ func (jointId JointId) GetTargetMotorSpeed() Q

+ func (jointId JointId) GetTorqueThreshold() Q

+ func (jointId JointId) SetAngularVelocity(velocity Q)

+ func (jointId JointId) SetForceThreshold(threshold Q)

+ func (jointId JointId) SetLinearVelocity(velocity Vec2)

+ func (jointId JointId) SetLocalFrameA(localFrame Transform)

+ func (jointId JointId) SetLocalFrameB(localFrame Transform)

+ func (jointId JointId) SetMaxSpringForce(maxForce Q)

+ func (jointId JointId) SetMaxSpringTorque(maxTorque Q)

+ func (jointId JointId) SetMaxVelocityForce(maxForce Q)

+ func (jointId JointId) SetMaxVelocityTorque(maxTorque Q)

+ func (jointId JointId) SetMoverMaxVelocityForce(maxForce Vec2)

+ func (jointId JointId) SetRestLength(length Q)

+ func (jointId JointId) SetSpringForceRange(lowerForce, upperForce Q)

+ func (jointId JointId) SetTargetMotorSpeed(motorSpeed Q)

+ func (jointId JointId) SetTorqueThreshold(threshold Q)

type JointType

+ const MoverJoint

+ const PogoJoint

+ type LocalManifold struct

+ Normal Vec2

+ PointCount int

+ Points [2]LocalManifoldPoint

+ type LocalManifoldPoint struct

+ Id uint16

+ Point Vec2

+ Separation Q

type ManifoldPoint

+ BaseSeparation Q

+ type MotionLocks struct

+ AngularZ bool

+ LinearX bool

+ LinearY bool

type MotorJointDef

+ AngularDampingRatio Q

+ AngularHertz Q

+ AngularVelocity Q

+ Base JointDef

+ LinearDampingRatio Q

+ LinearHertz Q

+ LinearVelocity Vec2

+ MaxSpringForce Q

+ MaxSpringTorque Q

+ MaxVelocityForce Q

+ MaxVelocityTorque Q

+ type MoverJointDef struct

+ Base JointDef

+ LinearVelocity Vec2

+ MaxVelocityForce Vec2

+ func DefaultMoverJointDef() MoverJointDef

+ type PogoJointDef struct

+ Base JointDef

+ DampingRatio Q

+ Hertz Q

+ Impulse Q

+ MaxCompressionForce Q

+ MaxTensionForce Q

+ Normal Vec2

+ RestLength Q

+ Velocity Q

+ func DefaultPogoJointDef() PogoJointDef

+ type Pos = Vec2

+ func LerpPos(a, b Pos, t Q) Pos

+ func OffsetPos(p Pos, d Vec2) Pos

+ func PosZero() Pos

+ func ToPos(v Vec2) Pos

+ func TransformWorldPoint(t WorldTransform, p Vec2) Pos

+ type PreContinuousFcn func(shapeIdA, shapeIdB ShapeId, point Pos, normal Vec2) bool

type PrismaticJointDef

+ Base JointDef

type Profile

+ Constraints float64

+ JointEvents float64

+ Restitution float64

+ SensorHits float64

+ SolverSetup float64

+ type Recording struct

+ func CreateRecording(byteCapacity int) *Recording

+ func CreateRecordingFromFile(path string) *Recording

+ func (r *Recording) Data() []byte

+ func (r *Recording) Destroy()

+ func (r *Recording) SaveToFile(path string) bool

+ func (r *Recording) Size() int

+ type Replay struct

+ func CreateReplay(data []byte, workerCount int) *Replay

+ func (p *Replay) Destroy()

+ func (p *Replay) DrawFrameQueries(draw *DebugDraw, queryIndex int)

+ func (p *Replay) GetBodyCount() int

+ func (p *Replay) GetBodyId(index int) BodyId

+ func (p *Replay) GetDivergeFrame() int

+ func (p *Replay) GetFrame() int

+ func (p *Replay) GetFrameQuery(index int) ReplayQueryInfo

+ func (p *Replay) GetFrameQueryCount() int

+ func (p *Replay) GetFrameQueryHit(queryIndex, hitIndex int) ReplayQueryHit

+ func (p *Replay) GetInfo() ReplayInfo

+ func (p *Replay) GetKeyframeBudget() int

+ func (p *Replay) GetKeyframeBytes() int

+ func (p *Replay) GetKeyframeInterval() int

+ func (p *Replay) GetKeyframeMinInterval() int

+ func (p *Replay) GetWorldId() WorldId

+ func (p *Replay) HasDiverged() bool

+ func (p *Replay) IsAtEnd() bool

+ func (p *Replay) Restart()

+ func (p *Replay) SeekFrame(targetFrame int)

+ func (p *Replay) SetKeyframePolicy(budgetBytes int, minIntervalFrames int)

+ func (p *Replay) StepFrame() bool

+ type ReplayInfo struct

+ Bounds AABB

+ FrameCount int

+ LengthScale float32

+ SubStepCount int

+ TimeStep Q

+ WorkerCount int

+ type ReplayQueryHit struct

+ Fraction Q

+ Normal Vec2

+ Point Pos

+ ShapeId ShapeId

+ type ReplayQueryInfo struct

+ AABB AABB

+ Filter QueryFilter

+ HitCount int

+ Origin Pos

+ Translation Vec2

+ Type ReplayQueryType

+ type ReplayQueryType int

+ const ReplayQueryCastMover

+ const ReplayQueryCastRay

+ const ReplayQueryCastRayClosest

+ const ReplayQueryCastShape

+ const ReplayQueryCollideMover

+ const ReplayQueryOverlapAABB

+ const ReplayQueryOverlapShape

type RevoluteJointDef

+ Base JointDef

type Rot

+ func InvertRot(a Rot) Rot

+ func MakeRotFromUnitVector(unitVector Vec2) Rot

type SegmentDistanceResult

+ func ComputeSegmentDistance(p1, q1, p2, q2 Vec2) SegmentDistanceResult

type ShapeCastPairInput

+ Transform Transform

type ShapeDef

+ EnableCustomFiltering bool

type ShapeId

+ func CreateChainSegmentShape(bodyId BodyId, def *ShapeDef, chainSegment *ChainSegment) ShapeId

+ func (shapeId ShapeId) ApplyWind(wind Vec2, drag, lift Q, wake bool)

+ func (shapeId ShapeId) CastRay(origin Pos, translation Vec2) WorldCastOutput

+ func (shapeId ShapeId) ComputeMassData() MassData

+ func (shapeId ShapeId) GetBounds() AABB

+ func (shapeId ShapeId) GetSensorData(overlaps []ShapeId) int

+ func (shapeId ShapeId) GetUserMaterial() uint64

+ func (shapeId ShapeId) SetChainSegment(chainSegment *ChainSegment)

+ func (shapeId ShapeId) SetUserMaterial(material uint64)

type TOIOutput

+ Normal Vec2

+ Point Vec2

+ func ComputeTimeOfImpact(input *TOIInput) TOIOutput

type Transform

+ func InvMulWorldTransforms(a, b WorldTransform) Transform

+ func ToRelativeTransform(t WorldTransform, base Pos) Transform

+ type TreeBoxCastCallbackFcn func(input *BoxCastInput, proxyId int, userData uint64) Q

type Vec2

+ func InvTransformWorldPoint(t WorldTransform, p Pos) Vec2

+ func SubPos(a, b Pos) Vec2

+ func ToVec2(p Pos) Vec2

type WeldJointDef

+ Base JointDef

type WheelJointDef

+ Base JointDef

+ type WorldCastOutput = CastOutput

type WorldDef

+ EnableRestitutionPropagation bool

+ RestitutionIterations int

type WorldId

+ func CreateWorldFromSnapshot(image []byte, workerCount int) WorldId

+ func (worldId WorldId) EnableRestitutionPropagation(flag bool)

+ func (worldId WorldId) GetBounds() AABB

+ func (worldId WorldId) GetContactRecycleDistance() Q

+ func (worldId WorldId) GetContactTuning() (hertz, dampingRatio, pushSpeed Q)

+ func (worldId WorldId) GetJointEvents() []JointEvent

+ func (worldId WorldId) GetMaxLinearSpeed() Q

+ func (worldId WorldId) GetRestitutionIterations() int

+ func (worldId WorldId) GetSnapshot(image []byte) int

+ func (worldId WorldId) GetStateHash() uint64

+ func (worldId WorldId) IsRestitutionPropagationEnabled() bool

+ func (worldId WorldId) RestoreFromSnapshot(image []byte) bool

+ func (worldId WorldId) SetContactRecycleDistance(recycleDistance Q)

+ func (worldId WorldId) SetMaxLinearSpeed(maximumLinearSpeed Q)

+ func (worldId WorldId) SetRestitutionIterations(iterations int)

+ func (worldId WorldId) StartRecording(recording *Recording)

+ func (worldId WorldId) StopRecording()

+ type WorldTransform = Transform

+ func MakeWorldTransform(t Transform) WorldTransform

+ func MulWorldTransforms(a WorldTransform, b Transform) WorldTransform

v1.0.0

Sep 14, 2026

Changes in this version

+ func LanePath() string

+ func LaneWidth() int

type Q

+ func Degrees[T Scalar](v T) Q

+ func F[T Scalar](v T) Q

+ type Scalar interface

type Vec2

+ func V2[T Scalar](x, y T) Vec2

+ type WorkerPanic struct

+ Stack []byte

+ Value any

+ WorkerIndex int

+ func (p *WorkerPanic) Error() string

+ func (p *WorkerPanic) Unwrap() error

v1.0.0-rc.1

Sep 13, 2026

v0

v0.8.0

Sep 11, 2026

Changes in this version

+ const ScalarMode

type Q

+ func (q Q) Abs() Q

+ func (q Q) Add(o Q) Q

+ func (q Q) Clamp(lo, hi Q) Q

+ func (q Q) Cmp(o Q) int

+ func (q Q) Div(o Q) Q

+ func (q Q) Eq(o Q) bool

+ func (q Q) Greater(o Q) bool

+ func (q Q) Int() int

+ func (q Q) Less(o Q) bool

+ func (q Q) Max(o Q) Q

+ func (q Q) Min(o Q) Q

+ func (q Q) Mul(o Q) Q

+ func (q Q) Neg() Q

+ func (q Q) Round() Q

+ func (q Q) Sqrt() Q

+ func (q Q) String() string

+ func (q Q) Sub(o Q) Q

type Rot

+ Cos Q

+ Sin Q

+ func (r Rot) Apply(v Vec2) Vec2

+ func (r Rot) Mul(o Rot) Rot

+ func (r Rot) Normalize() Rot

type Vec2

+ X Q

+ Y Q

+ func (v Vec2) Add(o Vec2) Vec2

+ func (v Vec2) Distance(o Vec2) Q

+ func (v Vec2) DistanceSq(o Vec2) Q

+ func (v Vec2) Div(s Q) Vec2

+ func (v Vec2) Dot(o Vec2) Q

+ func (v Vec2) Len() Q

+ func (v Vec2) LenSq() Q

+ func (v Vec2) Lerp(target Vec2, t Q) Vec2

+ func (v Vec2) Mul(s Q) Vec2

+ func (v Vec2) Normalize() Vec2

+ func (v Vec2) Sub(o Vec2) Vec2

v0.7.0

Sep 11, 2026

Changes in this version

+ type DynamicTree struct

+ func NewDynamicTree() *DynamicTree

+ func (t *DynamicTree) CreateProxy(aabb AABB, categoryBits uint64, userData uint64) int

+ func (t *DynamicTree) Destroy()

+ func (t *DynamicTree) DestroyProxy(proxyId int)

+ func (t *DynamicTree) EnlargeProxy(proxyId int, aabb AABB)

+ func (t *DynamicTree) GetAABB(proxyId int) AABB

+ func (t *DynamicTree) GetAreaRatio() Q

+ func (t *DynamicTree) GetCategoryBits(proxyId int) uint64

+ func (t *DynamicTree) GetHeight() int

+ func (t *DynamicTree) GetProxyCount() int

+ func (t *DynamicTree) GetRootBounds() AABB

+ func (t *DynamicTree) GetUserData(proxyId int) uint64

+ func (t *DynamicTree) MoveProxy(proxyId int, aabb AABB)

+ func (t *DynamicTree) Query(aabb AABB, maskBits uint64, fcn TreeQueryCallbackFcn) TreeStats

+ func (t *DynamicTree) RayCast(input *RayCastInput, maskBits uint64, fcn TreeRayCastCallbackFcn) TreeStats

+ func (t *DynamicTree) Rebuild(fullBuild bool) int

+ func (t *DynamicTree) SetCategoryBits(proxyId int, categoryBits uint64)

+ func (t *DynamicTree) ShapeCast(input *ShapeCastInput, maskBits uint64, fcn TreeShapeCastCallbackFcn) TreeStats

+ func (t *DynamicTree) Validate()

+ func (t *DynamicTree) ValidateNoEnlarged()

+ type TreeQueryCallbackFcn func(proxyId int, userData uint64) bool

+ type TreeRayCastCallbackFcn func(input *RayCastInput, proxyId int, userData uint64) Q

+ type TreeShapeCastCallbackFcn func(input *ShapeCastInput, proxyId int, userData uint64) Q

v0.6.0

Sep 7, 2026

Changes in this version

+ func QToFloat64(q Q) float64

type Q

+ func QFromFloat64(f float64) Q

v0.5.0

Sep 7, 2026

Changes in this version

type Counters

+ TaskCount int

+ type Profile struct

+ ApplyRestitution float64

+ Bullets float64

+ Collide float64

+ HitEvents float64

+ IntegratePositions float64

+ IntegrateVelocities float64

+ MergeIslands float64

+ Pairs float64

+ PrepareConstraints float64

+ PrepareStages float64

+ Refit float64

+ RelaxImpulses float64

+ Sensors float64

+ SleepIslands float64

+ Solve float64

+ SolveConstraints float64

+ SolveImpulses float64

+ SplitIslands float64

+ Step float64

+ StoreImpulses float64

+ Transforms float64

+ WarmStart float64

type Q

+ func QFromInt(i int) Q

+ func QFromRatio(num, den int) Q

+ func QHalf() Q

+ func QMaxValue() Q

+ func QMinValue() Q

+ func QMustParse(s string) Q

+ func QOne() Q

+ func QZero() Q

type WorldDef

+ WorkerCount int

type WorldId

+ func (id WorldId) DumpMemoryStats(w io.Writer)

+ func (id WorldId) GetProfile() Profile

v0.4.0

Sep 5, 2026

Changes in this version

+ var Huge = fixed.Q32FromInt(100000)

+ func DestroyChain(chainId ChainId)

type BodyId

+ func (bodyId BodyId) ApplyAngularImpulse(impulse Q, wake bool)

+ func (bodyId BodyId) ApplyForce(force, point Vec2, wake bool)

+ func (bodyId BodyId) ApplyForceToCenter(force Vec2, wake bool)

+ func (bodyId BodyId) ApplyLinearImpulse(impulse, point Vec2, wake bool)

+ func (bodyId BodyId) ApplyLinearImpulseToCenter(impulse Vec2, wake bool)

+ func (bodyId BodyId) ApplyMassFromShapes()

+ func (bodyId BodyId) ApplyTorque(torque Q, wake bool)

+ func (bodyId BodyId) ComputeAABB() AABB

+ func (bodyId BodyId) Disable()

+ func (bodyId BodyId) Enable()

+ func (bodyId BodyId) EnableContactEvents(flag bool)

+ func (bodyId BodyId) EnableHitEvents(flag bool)

+ func (bodyId BodyId) EnableSleep(enableSleep bool)

+ func (bodyId BodyId) GetAngularDamping() Q

+ func (bodyId BodyId) GetAngularVelocity() Q

+ func (bodyId BodyId) GetContactCapacity() int

+ func (bodyId BodyId) GetContactData(data []ContactData) int

+ func (bodyId BodyId) GetGravityScale() Q

+ func (bodyId BodyId) GetJointCount() int

+ func (bodyId BodyId) GetJoints(joints []JointId) int

+ func (bodyId BodyId) GetLinearDamping() Q

+ func (bodyId BodyId) GetLinearVelocity() Vec2

+ func (bodyId BodyId) GetLocalCenterOfMass() Vec2

+ func (bodyId BodyId) GetLocalPoint(worldPoint Vec2) Vec2

+ func (bodyId BodyId) GetLocalPointVelocity(localPoint Vec2) Vec2

+ func (bodyId BodyId) GetLocalVector(worldVector Vec2) Vec2

+ func (bodyId BodyId) GetMass() Q

+ func (bodyId BodyId) GetMassData() MassData

+ func (bodyId BodyId) GetName() string

+ func (bodyId BodyId) GetPosition() Vec2

+ func (bodyId BodyId) GetRotation() Rot

+ func (bodyId BodyId) GetRotationalInertia() Q

+ func (bodyId BodyId) GetShapeCount() int

+ func (bodyId BodyId) GetShapes(shapes []ShapeId) int

+ func (bodyId BodyId) GetSleepThreshold() Q

+ func (bodyId BodyId) GetTransform() Transform

+ func (bodyId BodyId) GetType() BodyType

+ func (bodyId BodyId) GetUserData() any

+ func (bodyId BodyId) GetWorld() WorldId

+ func (bodyId BodyId) GetWorldCenterOfMass() Vec2

+ func (bodyId BodyId) GetWorldPoint(localPoint Vec2) Vec2

+ func (bodyId BodyId) GetWorldPointVelocity(worldPoint Vec2) Vec2

+ func (bodyId BodyId) GetWorldVector(localVector Vec2) Vec2

+ func (bodyId BodyId) IsAwake() bool

+ func (bodyId BodyId) IsBullet() bool

+ func (bodyId BodyId) IsEnabled() bool

+ func (bodyId BodyId) IsFixedRotation() bool

+ func (bodyId BodyId) IsSleepEnabled() bool

+ func (bodyId BodyId) SetAngularDamping(angularDamping Q)

+ func (bodyId BodyId) SetAngularVelocity(angularVelocity Q)

+ func (bodyId BodyId) SetAwake(awake bool)

+ func (bodyId BodyId) SetBullet(flag bool)

+ func (bodyId BodyId) SetFixedRotation(flag bool)

+ func (bodyId BodyId) SetGravityScale(gravityScale Q)

+ func (bodyId BodyId) SetLinearDamping(linearDamping Q)

+ func (bodyId BodyId) SetLinearVelocity(linearVelocity Vec2)

+ func (bodyId BodyId) SetMassData(massData MassData)

+ func (bodyId BodyId) SetName(name string)

+ func (bodyId BodyId) SetSleepThreshold(sleepThreshold Q)

+ func (bodyId BodyId) SetTargetTransform(target Transform, timeStep Q)

+ func (bodyId BodyId) SetTransform(position Vec2, rotation Rot)

+ func (bodyId BodyId) SetType(bodyType BodyType)

+ func (bodyId BodyId) SetUserData(userData any)

+ type ChainDef struct

+ EnableSensorEvents bool

+ Filter Filter

+ IsLoop bool

+ Materials []SurfaceMaterial

+ Points []Vec2

+ UserData any

+ func DefaultChainDef() ChainDef

type ChainId

+ func CreateChain(bodyId BodyId, def *ChainDef) ChainId

+ func (chainId ChainId) GetFriction() Q

+ func (chainId ChainId) GetMaterial() int

+ func (chainId ChainId) GetRestitution() Q

+ func (chainId ChainId) GetSegmentCount() int

+ func (chainId ChainId) GetSegments(segments []ShapeId) int

+ func (chainId ChainId) GetWorld() WorldId

+ func (chainId ChainId) IsValid() bool

+ func (chainId ChainId) SetFriction(friction Q)

+ func (chainId ChainId) SetMaterial(material int)

+ func (chainId ChainId) SetRestitution(restitution Q)

+ type CollisionPlane struct

+ ClipVelocity bool

+ Plane Plane

+ Push Q

+ PushLimit Q

+ type ContactData struct

+ Manifold Manifold

+ ShapeIdA ShapeId

+ ShapeIdB ShapeId

+ type Counters struct

+ BodyCount int

+ ColorCounts [graphColorCount]int

+ ContactCount int

+ IslandCount int

+ JointCount int

+ ShapeCount int

+ StackUsed int

+ StaticTreeHeight int

+ TreeHeight int

+ type CustomFilterFcn func(shapeIdA, shapeIdB ShapeId) bool

+ type DebugDraw struct

+ DrawBodyNames bool

+ DrawBounds bool

+ DrawCircle DrawCircleFcn

+ DrawContactFeatures bool

+ DrawContactImpulses bool

+ DrawContactNormals bool

+ DrawContacts bool

+ DrawFrictionImpulses bool

+ DrawGraphColors bool

+ DrawIslands bool

+ DrawJointExtras bool

+ DrawJoints bool

+ DrawMass bool

+ DrawPoint DrawPointFcn

+ DrawPolygon DrawPolygonFcn

+ DrawSegment DrawSegmentFcn

+ DrawShapes bool

+ DrawSolidCapsule DrawSolidCapsuleFcn

+ DrawSolidCircle DrawSolidCircleFcn

+ DrawSolidPolygon DrawSolidPolygonFcn

+ DrawString DrawStringFcn

+ DrawTransform DrawTransformFcn

+ DrawingBounds AABB

+ UseDrawingBounds bool

+ func DefaultDebugDraw() DebugDraw

+ type DrawCircleFcn func(center Vec2, radius Q, color HexColor)

+ type DrawPointFcn func(p Vec2, size Q, color HexColor)

+ type DrawPolygonFcn func(vertices []Vec2, color HexColor)

+ type DrawSegmentFcn func(p1, p2 Vec2, color HexColor)

+ type DrawSolidCapsuleFcn func(p1, p2 Vec2, radius Q, color HexColor)

+ type DrawSolidCircleFcn func(transform Transform, radius Q, color HexColor)

+ type DrawSolidPolygonFcn func(transform Transform, vertices []Vec2, radius Q, color HexColor)

+ type DrawStringFcn func(p Vec2, s string, color HexColor)

+ type DrawTransformFcn func(transform Transform)

+ type ExplosionDef struct

+ Falloff Q

+ ImpulsePerLength Q

+ MaskBits uint64

+ Position Vec2

+ Radius Q

+ func DefaultExplosionDef() ExplosionDef

+ type FrictionCallback func(frictionA Q, userMaterialIdA int, frictionB Q, userMaterialIdB int) Q

+ type HexColor uint32

+ const ColorAliceBlue

+ const ColorAntiqueWhite

+ const ColorAqua

+ const ColorAquamarine

+ const ColorAzure

+ const ColorBeige

+ const ColorBisque

+ const ColorBlack

+ const ColorBlanchedAlmond

+ const ColorBlue

+ const ColorBlueViolet

+ const ColorBox2DBlue

+ const ColorBox2DGreen

+ const ColorBox2DRed

+ const ColorBox2DYellow

+ const ColorBrown

+ const ColorBurlywood

+ const ColorCadetBlue

+ const ColorChartreuse

+ const ColorChocolate

+ const ColorCoral

+ const ColorCornflowerBlue

+ const ColorCornsilk

+ const ColorCrimson

+ const ColorCyan

+ const ColorDarkBlue

+ const ColorDarkCyan

+ const ColorDarkGoldenRod

+ const ColorDarkGray

+ const ColorDarkGreen

+ const ColorDarkKhaki

+ const ColorDarkMagenta

+ const ColorDarkOliveGreen

+ const ColorDarkOrange

+ const ColorDarkOrchid

+ const ColorDarkRed

+ const ColorDarkSalmon

+ const ColorDarkSeaGreen

+ const ColorDarkSlateBlue

+ const ColorDarkSlateGray

+ const ColorDarkTurquoise

+ const ColorDarkViolet

+ const ColorDeepPink

+ const ColorDeepSkyBlue

+ const ColorDimGray

+ const ColorDodgerBlue

+ const ColorFireBrick

+ const ColorFloralWhite

+ const ColorForestGreen

+ const ColorFuchsia

+ const ColorGainsboro

+ const ColorGhostWhite

+ const ColorGold

+ const ColorGoldenRod

+ const ColorGray

+ const ColorGreen

+ const ColorGreenYellow

+ const ColorHoneyDew

+ const ColorHotPink

+ const ColorIndianRed

+ const ColorIndigo

+ const ColorIvory

+ const ColorKhaki

+ const ColorLavender

+ const ColorLavenderBlush

+ const ColorLawnGreen

+ const ColorLemonChiffon

+ const ColorLightBlue

+ const ColorLightCoral

+ const ColorLightCyan

+ const ColorLightGoldenRodYellow

+ const ColorLightGray

+ const ColorLightGreen

+ const ColorLightPink

+ const ColorLightSalmon

+ const ColorLightSeaGreen

+ const ColorLightSkyBlue

+ const ColorLightSlateGray

+ const ColorLightSteelBlue

+ const ColorLightYellow

+ const ColorLime

+ const ColorLimeGreen

+ const ColorLinen

+ const ColorMagenta

+ const ColorMaroon

+ const ColorMediumAquaMarine

+ const ColorMediumBlue

+ const ColorMediumOrchid

+ const ColorMediumPurple

+ const ColorMediumSeaGreen

+ const ColorMediumSlateBlue

+ const ColorMediumSpringGreen

+ const ColorMediumTurquoise

+ const ColorMediumVioletRed

+ const ColorMidnightBlue

+ const ColorMintCream

+ const ColorMistyRose

+ const ColorMoccasin

+ const ColorNavajoWhite

+ const ColorNavy

+ const ColorOldLace

+ const ColorOlive

+ const ColorOliveDrab

+ const ColorOrange

+ const ColorOrangeRed

+ const ColorOrchid

+ const ColorPaleGoldenRod

+ const ColorPaleGreen

+ const ColorPaleTurquoise

+ const ColorPaleVioletRed

+ const ColorPapayaWhip

+ const ColorPeachPuff

+ const ColorPeru

+ const ColorPink

+ const ColorPlum

+ const ColorPowderBlue

+ const ColorPurple

+ const ColorRebeccaPurple

+ const ColorRed

+ const ColorRosyBrown

+ const ColorRoyalBlue

+ const ColorSaddleBrown

+ const ColorSalmon

+ const ColorSandyBrown

+ const ColorSeaGreen

+ const ColorSeaShell

+ const ColorSienna

+ const ColorSilver

+ const ColorSkyBlue

+ const ColorSlateBlue

+ const ColorSlateGray

+ const ColorSnow

+ const ColorSpringGreen

+ const ColorSteelBlue

+ const ColorTan

+ const ColorTeal

+ const ColorThistle

+ const ColorTomato

+ const ColorTurquoise

+ const ColorViolet

+ const ColorWheat

+ const ColorWhite

+ const ColorWhiteSmoke

+ const ColorYellow

+ const ColorYellowGreen

type JointId

+ func (jointId JointId) EnableLimit(enableLimit bool)

+ func (jointId JointId) EnableMotor(enableMotor bool)

+ func (jointId JointId) EnableSpring(enableSpring bool)

+ func (jointId JointId) GetAngle() Q

+ func (jointId JointId) GetAngularDampingRatio() Q

+ func (jointId JointId) GetAngularHertz() Q

+ func (jointId JointId) GetAngularOffset() Q

+ func (jointId JointId) GetAngularSeparation() Q

+ func (jointId JointId) GetBodyA() BodyId

+ func (jointId JointId) GetBodyB() BodyId

+ func (jointId JointId) GetCollideConnected() bool

+ func (jointId JointId) GetConstraintForce() Vec2

+ func (jointId JointId) GetConstraintTorque() Q

+ func (jointId JointId) GetConstraintTuning() (hertz, dampingRatio Q)

+ func (jointId JointId) GetCorrectionFactor() Q

+ func (jointId JointId) GetCurrentLength() Q

+ func (jointId JointId) GetLength() Q

+ func (jointId JointId) GetLinearDampingRatio() Q

+ func (jointId JointId) GetLinearHertz() Q

+ func (jointId JointId) GetLinearOffset() Vec2

+ func (jointId JointId) GetLinearSeparation() Q

+ func (jointId JointId) GetLocalAnchorA() Vec2

+ func (jointId JointId) GetLocalAnchorB() Vec2

+ func (jointId JointId) GetLocalAxisA() Vec2

+ func (jointId JointId) GetLowerLimit() Q

+ func (jointId JointId) GetMaxForce() Q

+ func (jointId JointId) GetMaxLength() Q

+ func (jointId JointId) GetMaxMotorForce() Q

+ func (jointId JointId) GetMaxMotorTorque() Q

+ func (jointId JointId) GetMaxTorque() Q

+ func (jointId JointId) GetMinLength() Q

+ func (jointId JointId) GetMotorForce() Q

+ func (jointId JointId) GetMotorSpeed() Q

+ func (jointId JointId) GetMotorTorque() Q

+ func (jointId JointId) GetReferenceAngle() Q

+ func (jointId JointId) GetSpeed() Q

+ func (jointId JointId) GetSpringDampingRatio() Q

+ func (jointId JointId) GetSpringHertz() Q

+ func (jointId JointId) GetTarget() Vec2

+ func (jointId JointId) GetTargetAngle() Q

+ func (jointId JointId) GetTargetTranslation() Q

+ func (jointId JointId) GetTranslation() Q

+ func (jointId JointId) GetType() JointType

+ func (jointId JointId) GetUpperLimit() Q

+ func (jointId JointId) GetUserData() any

+ func (jointId JointId) GetWorld() WorldId

+ func (jointId JointId) IsLimitEnabled() bool

+ func (jointId JointId) IsMotorEnabled() bool

+ func (jointId JointId) IsSpringEnabled() bool

+ func (jointId JointId) IsValid() bool

+ func (jointId JointId) SetAngularDampingRatio(dampingRatio Q)

+ func (jointId JointId) SetAngularHertz(hertz Q)

+ func (jointId JointId) SetAngularOffset(angularOffset Q)

+ func (jointId JointId) SetCollideConnected(shouldCollide bool)

+ func (jointId JointId) SetConstraintTuning(hertz, dampingRatio Q)

+ func (jointId JointId) SetCorrectionFactor(correctionFactor Q)

+ func (jointId JointId) SetLength(length Q)

+ func (jointId JointId) SetLengthRange(minLength, maxLength Q)

+ func (jointId JointId) SetLimits(lower, upper Q)

+ func (jointId JointId) SetLinearDampingRatio(dampingRatio Q)

+ func (jointId JointId) SetLinearHertz(hertz Q)

+ func (jointId JointId) SetLinearOffset(linearOffset Vec2)

+ func (jointId JointId) SetLocalAnchorA(localAnchor Vec2)

+ func (jointId JointId) SetLocalAnchorB(localAnchor Vec2)

+ func (jointId JointId) SetLocalAxisA(axis Vec2)

+ func (jointId JointId) SetMaxForce(maxForce Q)

+ func (jointId JointId) SetMaxMotorForce(force Q)

+ func (jointId JointId) SetMaxMotorTorque(torque Q)

+ func (jointId JointId) SetMaxTorque(maxTorque Q)

+ func (jointId JointId) SetMotorSpeed(motorSpeed Q)

+ func (jointId JointId) SetReferenceAngle(angle Q)

+ func (jointId JointId) SetSpringDampingRatio(dampingRatio Q)

+ func (jointId JointId) SetSpringHertz(hertz Q)

+ func (jointId JointId) SetTarget(target Vec2)

+ func (jointId JointId) SetTargetAngle(angle Q)

+ func (jointId JointId) SetTargetTranslation(translation Q)

+ func (jointId JointId) SetUserData(userData any)

+ func (jointId JointId) WakeBodies()

+ type PlaneResult struct

+ Hit bool

+ Plane Plane

+ Point Vec2

+ func CollideMoverAndCapsule(mover *Capsule, shape *Capsule) PlaneResult

+ func CollideMoverAndCircle(mover *Capsule, shape *Circle) PlaneResult

+ func CollideMoverAndPolygon(mover *Capsule, shape *Polygon) PlaneResult

+ func CollideMoverAndSegment(mover *Capsule, shape *Segment) PlaneResult

+ type PlaneResultFcn func(shapeId ShapeId, result *PlaneResult) bool

+ type PlaneSolverResult struct

+ IterationCount int

+ Translation Vec2

+ func SolvePlanes(targetDelta Vec2, planes []CollisionPlane) PlaneSolverResult

+ type PreSolveFcn func(shapeIdA, shapeIdB ShapeId, manifold *Manifold) bool

+ type RestitutionCallback func(restitutionA Q, userMaterialIdA int, restitutionB Q, userMaterialIdB int) Q

type RevoluteJointDef

+ DrawSize Q

+ type SensorBeginTouchEvent struct

+ SensorShapeId ShapeId

+ VisitorShapeId ShapeId

+ type SensorEndTouchEvent struct

+ SensorShapeId ShapeId

+ VisitorShapeId ShapeId

+ type SensorEvents struct

+ BeginEvents []SensorBeginTouchEvent

+ EndEvents []SensorEndTouchEvent

type ShapeId

+ func (shapeId ShapeId) AreContactEventsEnabled() bool

+ func (shapeId ShapeId) AreHitEventsEnabled() bool

+ func (shapeId ShapeId) ArePreSolveEventsEnabled() bool

+ func (shapeId ShapeId) AreSensorEventsEnabled() bool

+ func (shapeId ShapeId) EnableContactEvents(flag bool)

+ func (shapeId ShapeId) EnableHitEvents(flag bool)

+ func (shapeId ShapeId) EnablePreSolveEvents(flag bool)

+ func (shapeId ShapeId) EnableSensorEvents(flag bool)

+ func (shapeId ShapeId) GetAABB() AABB

+ func (shapeId ShapeId) GetBody() BodyId

+ func (shapeId ShapeId) GetCapsule() Capsule

+ func (shapeId ShapeId) GetChainSegment() ChainSegment

+ func (shapeId ShapeId) GetCircle() Circle

+ func (shapeId ShapeId) GetClosestPoint(target Vec2) Vec2

+ func (shapeId ShapeId) GetContactCapacity() int

+ func (shapeId ShapeId) GetContactData(data []ContactData) int

+ func (shapeId ShapeId) GetDensity() Q

+ func (shapeId ShapeId) GetFilter() Filter

+ func (shapeId ShapeId) GetFriction() Q

+ func (shapeId ShapeId) GetMassData() MassData

+ func (shapeId ShapeId) GetMaterial() int

+ func (shapeId ShapeId) GetParentChain() ChainId

+ func (shapeId ShapeId) GetPolygon() Polygon

+ func (shapeId ShapeId) GetRestitution() Q

+ func (shapeId ShapeId) GetSegment() Segment

+ func (shapeId ShapeId) GetSensorCapacity() int

+ func (shapeId ShapeId) GetSensorOverlaps(overlaps []ShapeId) int

+ func (shapeId ShapeId) GetSurfaceMaterial() SurfaceMaterial

+ func (shapeId ShapeId) GetType() ShapeType

+ func (shapeId ShapeId) GetUserData() any

+ func (shapeId ShapeId) GetWorld() WorldId

+ func (shapeId ShapeId) IsSensor() bool

+ func (shapeId ShapeId) RayCast(input *RayCastInput) CastOutput

+ func (shapeId ShapeId) SetCapsule(capsule *Capsule)

+ func (shapeId ShapeId) SetCircle(circle *Circle)

+ func (shapeId ShapeId) SetDensity(density Q, updateBodyMass bool)

+ func (shapeId ShapeId) SetFilter(filter Filter)

+ func (shapeId ShapeId) SetFriction(friction Q)

+ func (shapeId ShapeId) SetMaterial(material int)

+ func (shapeId ShapeId) SetPolygon(polygon *Polygon)

+ func (shapeId ShapeId) SetRestitution(restitution Q)

+ func (shapeId ShapeId) SetSegment(segment *Segment)

+ func (shapeId ShapeId) SetSurfaceMaterial(material SurfaceMaterial)

+ func (shapeId ShapeId) SetUserData(userData any)

+ func (shapeId ShapeId) TestPoint(point Vec2) bool

type Vec2

+ func ClipVector(vector Vec2, planes []CollisionPlane) Vec2

type WorldDef

+ FrictionCallback FrictionCallback

+ RestitutionCallback RestitutionCallback

type WorldId

+ func (worldId WorldId) CastMover(mover *Capsule, translation Vec2, filter QueryFilter) Q

+ func (worldId WorldId) CastRay(origin, translation Vec2, filter QueryFilter, fcn CastResultFcn) TreeStats

+ func (worldId WorldId) CastRayClosest(origin, translation Vec2, filter QueryFilter) RayResult

+ func (worldId WorldId) CastShape(proxy *ShapeProxy, translation Vec2, filter QueryFilter, fcn CastResultFcn) TreeStats

+ func (worldId WorldId) CollideMover(mover *Capsule, filter QueryFilter, fcn PlaneResultFcn)

+ func (worldId WorldId) Draw(draw *DebugDraw)

+ func (worldId WorldId) EnableContinuous(flag bool)

+ func (worldId WorldId) EnableSleeping(flag bool)

+ func (worldId WorldId) EnableSpeculative(flag bool)

+ func (worldId WorldId) EnableWarmStarting(flag bool)

+ func (worldId WorldId) Explode(def *ExplosionDef)

+ func (worldId WorldId) GetAwakeBodyCount() int

+ func (worldId WorldId) GetBodyEvents() BodyEvents

+ func (worldId WorldId) GetContactEvents() ContactEvents

+ func (worldId WorldId) GetCounters() Counters

+ func (worldId WorldId) GetGravity() Vec2

+ func (worldId WorldId) GetHitEventThreshold() Q

+ func (worldId WorldId) GetMaximumLinearSpeed() Q

+ func (worldId WorldId) GetRestitutionThreshold() Q

+ func (worldId WorldId) GetSensorEvents() SensorEvents

+ func (worldId WorldId) GetUserData() any

+ func (worldId WorldId) IsContinuousEnabled() bool

+ func (worldId WorldId) IsSleepingEnabled() bool

+ func (worldId WorldId) IsWarmStartingEnabled() bool

+ func (worldId WorldId) OverlapAABB(aabb AABB, filter QueryFilter, fcn OverlapResultFcn) TreeStats

+ func (worldId WorldId) OverlapShape(proxy *ShapeProxy, filter QueryFilter, fcn OverlapResultFcn) TreeStats

+ func (worldId WorldId) RebuildStaticTree()

+ func (worldId WorldId) SetContactTuning(hertz, dampingRatio, pushSpeed Q)

+ func (worldId WorldId) SetCustomFilterCallback(fcn CustomFilterFcn)

+ func (worldId WorldId) SetFrictionCallback(callback FrictionCallback)

+ func (worldId WorldId) SetGravity(gravity Vec2)

+ func (worldId WorldId) SetHitEventThreshold(value Q)

+ func (worldId WorldId) SetMaximumLinearSpeed(maximumLinearSpeed Q)

+ func (worldId WorldId) SetPreSolveCallback(fcn PreSolveFcn)

+ func (worldId WorldId) SetRestitutionCallback(callback RestitutionCallback)

+ func (worldId WorldId) SetRestitutionThreshold(value Q)

+ func (worldId WorldId) SetUserData(userData any)

+ func (worldId WorldId) Step(timeStep Q, subStepCount int)

v0.3.0

Sep 4, 2026

Changes in this version

+ func DestroyJoint(jointId JointId)

+ type BodyEvents struct

+ MoveEvents []BodyMoveEvent

+ func GetBodyEvents(worldId WorldId) BodyEvents

+ type BodyMoveEvent struct

+ BodyId BodyId

+ FellAsleep bool

+ Transform Transform

+ UserData any

type CastOutput

+ func ShapeCast(input *ShapeCastPairInput) CastOutput

+ func ShapeCastCapsule(input *ShapeCastInput, shape *Capsule) CastOutput

+ func ShapeCastCircle(input *ShapeCastInput, shape *Circle) CastOutput

+ func ShapeCastPolygon(input *ShapeCastInput, shape *Polygon) CastOutput

+ func ShapeCastSegment(input *ShapeCastInput, shape *Segment) CastOutput

+ type CastResultFcn func(shapeId ShapeId, point, normal Vec2, fraction Q) Q

+ type ContactBeginTouchEvent struct

+ Manifold Manifold

+ ShapeIdA ShapeId

+ ShapeIdB ShapeId

+ type ContactEndTouchEvent struct

+ ShapeIdA ShapeId

+ ShapeIdB ShapeId

+ type ContactEvents struct

+ BeginEvents []ContactBeginTouchEvent

+ EndEvents []ContactEndTouchEvent

+ HitEvents []ContactHitEvent

+ func GetContactEvents(worldId WorldId) ContactEvents

+ type ContactHitEvent struct

+ ApproachSpeed Q

+ Normal Vec2

+ Point Vec2

+ ShapeIdA ShapeId

+ ShapeIdB ShapeId

+ type DistanceInput struct

+ ProxyA ShapeProxy

+ ProxyB ShapeProxy

+ TransformA Transform

+ TransformB Transform

+ UseRadii bool

+ type DistanceJointDef struct

+ BodyIdA BodyId

+ BodyIdB BodyId

+ CollideConnected bool

+ DampingRatio Q

+ EnableLimit bool

+ EnableMotor bool

+ EnableSpring bool

+ Hertz Q

+ Length Q

+ LocalAnchorA Vec2

+ LocalAnchorB Vec2

+ MaxLength Q

+ MaxMotorForce Q

+ MinLength Q

+ MotorSpeed Q

+ UserData any

+ func DefaultDistanceJointDef() DistanceJointDef

+ type DistanceOutput struct

+ Distance Q

+ Iterations int

+ Normal Vec2

+ PointA Vec2

+ PointB Vec2

+ SimplexCount int

+ func ShapeDistance(input *DistanceInput, cache *SimplexCache, simplexes []Simplex) DistanceOutput

+ type FilterJointDef struct

+ BodyIdA BodyId

+ BodyIdB BodyId

+ UserData any

+ func DefaultFilterJointDef() FilterJointDef

type JointId

+ func CreateDistanceJoint(worldId WorldId, def *DistanceJointDef) JointId

+ func CreateFilterJoint(worldId WorldId, def *FilterJointDef) JointId

+ func CreateMotorJoint(worldId WorldId, def *MotorJointDef) JointId

+ func CreateMouseJoint(worldId WorldId, def *MouseJointDef) JointId

+ func CreatePrismaticJoint(worldId WorldId, def *PrismaticJointDef) JointId

+ func CreateRevoluteJoint(worldId WorldId, def *RevoluteJointDef) JointId

+ func CreateWeldJoint(worldId WorldId, def *WeldJointDef) JointId

+ func CreateWheelJoint(worldId WorldId, def *WheelJointDef) JointId

+ type JointType int

+ const DistanceJoint

+ const FilterJoint

+ const MotorJoint

+ const MouseJoint

+ const PrismaticJoint

+ const RevoluteJoint

+ const WeldJoint

+ const WheelJoint

type Manifold

+ func CollideChainSegmentAndCapsule(segmentA *ChainSegment, xfA Transform, capsuleB *Capsule, xfB Transform, ...) Manifold

+ func CollideChainSegmentAndPolygon(segmentA *ChainSegment, xfA Transform, polygonB *Polygon, xfB Transform, ...) Manifold

+ type MotorJointDef struct

+ AngularOffset Q

+ BodyIdA BodyId

+ BodyIdB BodyId

+ CollideConnected bool

+ CorrectionFactor Q

+ LinearOffset Vec2

+ MaxForce Q

+ MaxTorque Q

+ UserData any

+ func DefaultMotorJointDef() MotorJointDef

+ type MouseJointDef struct

+ BodyIdA BodyId

+ BodyIdB BodyId

+ CollideConnected bool

+ DampingRatio Q

+ Hertz Q

+ MaxForce Q

+ Target Vec2

+ UserData any

+ func DefaultMouseJointDef() MouseJointDef

+ type OverlapResultFcn func(shapeId ShapeId) bool

+ type PrismaticJointDef struct

+ BodyIdA BodyId

+ BodyIdB BodyId

+ CollideConnected bool

+ DampingRatio Q

+ EnableLimit bool

+ EnableMotor bool

+ EnableSpring bool

+ Hertz Q

+ LocalAnchorA Vec2

+ LocalAnchorB Vec2

+ LocalAxisA Vec2

+ LowerTranslation Q

+ MaxMotorForce Q

+ MotorSpeed Q

+ ReferenceAngle Q

+ TargetTranslation Q

+ UpperTranslation Q

+ UserData any

+ func DefaultPrismaticJointDef() PrismaticJointDef

type Q

+ func CastMover(worldId WorldId, mover *Capsule, translation Vec2, filter QueryFilter) Q

+ type RayResult struct

+ Fraction Q

+ Hit bool

+ LeafVisits int

+ NodeVisits int

+ Normal Vec2

+ Point Vec2

+ ShapeId ShapeId

+ func CastRayClosest(worldId WorldId, origin, translation Vec2, filter QueryFilter) RayResult

+ type RevoluteJointDef struct

+ BodyIdA BodyId

+ BodyIdB BodyId

+ CollideConnected bool

+ DampingRatio Q

+ EnableLimit bool

+ EnableMotor bool

+ EnableSpring bool

+ Hertz Q

+ LocalAnchorA Vec2

+ LocalAnchorB Vec2

+ LowerAngle Q

+ MaxMotorTorque Q

+ MotorSpeed Q

+ ReferenceAngle Q

+ TargetAngle Q

+ UpperAngle Q

+ UserData any

+ func DefaultRevoluteJointDef() RevoluteJointDef

+ type ShapeCastPairInput struct

+ CanEncroach bool

+ MaxFraction Q

+ ProxyA ShapeProxy

+ ProxyB ShapeProxy

+ TransformA Transform

+ TransformB Transform

+ TranslationB Vec2

type ShapeProxy

+ func MakeOffsetProxy(points []Vec2, radius Q, position Vec2, rotation Rot) ShapeProxy

+ type Simplex struct

+ Count int

+ V1 SimplexVertex

+ V2 SimplexVertex

+ V3 SimplexVertex

+ type SimplexVertex struct

+ A Q

+ IndexA int

+ IndexB int

+ W Vec2

+ WA Vec2

+ WB Vec2

+ type Sweep struct

+ C1 Vec2

+ C2 Vec2

+ LocalCenter Vec2

+ Q1 Rot

+ Q2 Rot

+ type TOIInput struct

+ MaxFraction Q

+ ProxyA ShapeProxy

+ ProxyB ShapeProxy

+ SweepA Sweep

+ SweepB Sweep

+ type TOIOutput struct

+ Fraction Q

+ State TOIState

+ func TimeOfImpact(input *TOIInput) TOIOutput

+ type TOIState int

+ const TOIStateFailed

+ const TOIStateHit

+ const TOIStateOverlapped

+ const TOIStateSeparated

+ const TOIStateUnknown

type Transform

+ func GetSweepTransform(sweep *Sweep, time Q) Transform

+ type TreeStats struct

+ LeafVisits int

+ NodeVisits int

+ func CastRay(worldId WorldId, origin, translation Vec2, filter QueryFilter, ...) TreeStats

+ func CastShape(worldId WorldId, proxy *ShapeProxy, translation Vec2, filter QueryFilter, ...) TreeStats

+ func OverlapAABB(worldId WorldId, aabb AABB, filter QueryFilter, fcn OverlapResultFcn) TreeStats

+ func OverlapShape(worldId WorldId, proxy *ShapeProxy, filter QueryFilter, fcn OverlapResultFcn) TreeStats

+ type WeldJointDef struct

+ AngularDampingRatio Q

+ AngularHertz Q

+ BodyIdA BodyId

+ BodyIdB BodyId

+ CollideConnected bool

+ LinearDampingRatio Q

+ LinearHertz Q

+ LocalAnchorA Vec2

+ LocalAnchorB Vec2

+ ReferenceAngle Q

+ UserData any

+ func DefaultWeldJointDef() WeldJointDef

+ type WheelJointDef struct

+ BodyIdA BodyId

+ BodyIdB BodyId

+ CollideConnected bool

+ DampingRatio Q

+ EnableLimit bool

+ EnableMotor bool

+ EnableSpring bool

+ Hertz Q

+ LocalAnchorA Vec2

+ LocalAnchorB Vec2

+ LocalAxisA Vec2

+ LowerTranslation Q

+ MaxMotorTorque Q

+ MotorSpeed Q

+ UpperTranslation Q

+ UserData any

+ func DefaultWheelJointDef() WheelJointDef

v0.2.0

Aug 31, 2026

Changes in this version

type Manifold

+ func CollideCapsuleAndCircle(capsuleA *Capsule, xfA Transform, circleB *Circle, xfB Transform) Manifold

+ func CollideCapsules(capsuleA *Capsule, xfA Transform, capsuleB *Capsule, xfB Transform) Manifold

+ func CollideChainSegmentAndCircle(segmentA *ChainSegment, xfA Transform, circleB *Circle, xfB Transform) Manifold

+ func CollideCircles(circleA *Circle, xfA Transform, circleB *Circle, xfB Transform) Manifold

+ func CollidePolygonAndCapsule(polygonA *Polygon, xfA Transform, capsuleB *Capsule, xfB Transform) Manifold

+ func CollidePolygonAndCircle(polygonA *Polygon, xfA Transform, circleB *Circle, xfB Transform) Manifold

+ func CollidePolygons(polygonA *Polygon, xfA Transform, polygonB *Polygon, xfB Transform) Manifold

+ func CollideSegmentAndCapsule(segmentA *Segment, xfA Transform, capsuleB *Capsule, xfB Transform) Manifold

+ func CollideSegmentAndCircle(segmentA *Segment, xfA Transform, circleB *Circle, xfB Transform) Manifold

+ func CollideSegmentAndPolygon(segmentA *Segment, xfA Transform, polygonB *Polygon, xfB Transform) Manifold

+ type SegmentDistanceResult struct

+ Closest1 Vec2

+ Closest2 Vec2

+ DistanceSquared Q

+ Fraction1 Q

+ Fraction2 Q

+ func SegmentDistance(p1, q1, p2, q2 Vec2) SegmentDistanceResult

type ShapeProxy

+ func MakeProxy(points []Vec2, radius Q) ShapeProxy

+ type SimplexCache struct

+ Count uint16

+ IndexA [3]uint8

+ IndexB [3]uint8

v0.1.0

Aug 31, 2026

Changes in this version

+ const DefaultCategoryBits

+ const DefaultMaskBits

+ const MaxPolygonVertices

+ func AABBContains(a, b AABB) bool

+ func AABBOverlaps(a, b AABB) bool

+ func Checksum(worldId WorldId) uint64

+ func ClampInt(a, lower, upper int) int

+ func DestroyBody(bodyId BodyId)

+ func DestroyShape(shapeId ShapeId, updateBodyMass bool)

+ func DestroyWorld(worldId WorldId)

+ func GetLengthAndNormalize(v Vec2) (Q, Vec2)

+ func IsNormalized(a Vec2) bool

+ func IsNormalizedRot(q Rot) bool

+ func IsValidAABB(a AABB) bool

+ func IsValidPlane(a Plane) bool

+ func IsValidQ(a Q) bool

+ func IsValidRay(input *RayCastInput) bool

+ func IsValidRotation(q Rot) bool

+ func IsValidVec2(v Vec2) bool

+ func PointInCapsule(point Vec2, shape *Capsule) bool

+ func PointInCircle(point Vec2, shape *Circle) bool

+ func Step(worldId WorldId, timeStep Q, subStepCount int)

+ func StoreBodyId(id BodyId) uint64

+ func StoreChainId(id ChainId) uint64

+ func StoreJointId(id JointId) uint64

+ func StoreShapeId(id ShapeId) uint64

+ func StoreWorldId(id WorldId) uint32

+ func ValidateHull(hull *Hull) bool

+ type AABB struct

+ LowerBound Vec2

+ UpperBound Vec2

+ func AABBUnion(a, b AABB) AABB

+ func ComputeCapsuleAABB(shape *Capsule, xf Transform) AABB

+ func ComputeCircleAABB(shape *Circle, xf Transform) AABB

+ func ComputePolygonAABB(shape *Polygon, xf Transform) AABB

+ func ComputeSegmentAABB(shape *Segment, xf Transform) AABB

+ func MakeAABB(points []Vec2, radius Q) AABB

+ type BodyDef struct

+ AllowFastRotation bool

+ AngularDamping Q

+ AngularVelocity Q

+ EnableSleep bool

+ FixedRotation bool

+ GravityScale Q

+ IsAwake bool

+ IsBullet bool

+ IsEnabled bool

+ LinearDamping Q

+ LinearVelocity Vec2

+ Name string

+ Position Vec2

+ Rotation Rot

+ SleepThreshold Q

+ Type BodyType

+ UserData any

+ func DefaultBodyDef() BodyDef

+ type BodyId struct

+ func CreateBody(worldId WorldId, def *BodyDef) BodyId

+ func LoadBodyId(x uint64) BodyId

+ func (bodyId BodyId) Mass() Q

+ func (bodyId BodyId) Position() Vec2

+ func (bodyId BodyId) Rotation() Rot

+ func (bodyId BodyId) ShapeCount() int

+ func (id BodyId) IsNull() bool

+ func (id BodyId) IsValid() bool

+ type BodyType int

+ const BodyTypeCount

+ const DynamicBody

+ const KinematicBody

+ const StaticBody

+ type Capsule struct

+ Center1 Vec2

+ Center2 Vec2

+ Radius Q

+ type CastOutput struct

+ Fraction Q

+ Hit bool

+ Iterations int

+ Normal Vec2

+ Point Vec2

+ func RayCastCapsule(input *RayCastInput, shape *Capsule) CastOutput

+ func RayCastCircle(input *RayCastInput, shape *Circle) CastOutput

+ func RayCastPolygon(input *RayCastInput, shape *Polygon) CastOutput

+ func RayCastSegment(input *RayCastInput, shape *Segment, oneSided bool) CastOutput

+ type ChainId struct

+ func LoadChainId(x uint64) ChainId

+ func (id ChainId) IsNull() bool

+ type ChainSegment struct

+ ChainId int

+ Ghost1 Vec2

+ Ghost2 Vec2

+ Segment Segment

+ type Circle struct

+ Center Vec2

+ Radius Q

+ type Filter struct

+ CategoryBits uint64

+ GroupIndex int

+ MaskBits uint64

+ func DefaultFilter() Filter

+ type Hull struct

+ Count int

+ Points [MaxPolygonVertices]Vec2

+ func ComputeHull(points []Vec2) Hull

+ type JointId struct

+ func LoadJointId(x uint64) JointId

+ func (id JointId) IsNull() bool

+ type Manifold struct

+ Normal Vec2

+ PointCount int

+ Points [2]ManifoldPoint

+ RollingImpulse Q

+ type ManifoldPoint struct

+ AnchorA Vec2

+ AnchorB Vec2

+ Id uint16

+ NormalImpulse Q

+ NormalVelocity Q

+ Persisted bool

+ Point Vec2

+ Separation Q

+ TangentImpulse Q

+ TotalNormalImpulse Q

+ type MassData struct

+ Center Vec2

+ Mass Q

+ RotationalInertia Q

+ func ComputeCapsuleMass(shape *Capsule, density Q) MassData

+ func ComputeCircleMass(shape *Circle, density Q) MassData

+ func ComputePolygonMass(shape *Polygon, density Q) MassData

+ type Mat22 struct

+ Cx Vec2

+ Cy Vec2

+ func GetInverse22(m Mat22) Mat22

+ func Mat22Zero() Mat22

+ type Plane struct

+ Normal Vec2

+ Offset Q

+ type Polygon struct

+ Centroid Vec2

+ Count int

+ Normals [MaxPolygonVertices]Vec2

+ Radius Q

+ Vertices [MaxPolygonVertices]Vec2

+ func MakeBox(halfWidth, halfHeight Q) Polygon

+ func MakeOffsetBox(halfWidth, halfHeight Q, center Vec2, rotation Rot) Polygon

+ func MakeOffsetPolygon(hull *Hull, position Vec2, rotation Rot) Polygon

+ func MakeOffsetRoundedBox(halfWidth, halfHeight Q, center Vec2, rotation Rot, radius Q) Polygon

+ func MakeOffsetRoundedPolygon(hull *Hull, position Vec2, rotation Rot, radius Q) Polygon

+ func MakePolygon(hull *Hull, radius Q) Polygon

+ func MakeRoundedBox(halfWidth, halfHeight, radius Q) Polygon

+ func MakeSquare(halfWidth Q) Polygon

+ func TransformPolygon(transform Transform, polygon *Polygon) Polygon

+ type Q = fixed.Q

+ func AABBMargin() Q

+ func ComputeAngularVelocity(q1, q2 Rot, invH Q) Q

+ func Cross(a, b Vec2) Q

+ func JointConstraintDampingRatio() Q

+ func JointConstraintHertz() Q

+ func LinearSlop() Q

+ func MaxRotation() Q

+ func Pi() Q

+ func PlaneSeparation(plane Plane, point Vec2) Q

+ func RelativeAngle(b, a Rot) Q

+ func RotGetAngle(q Rot) Q

+ func SpeculativeDistance() Q

+ func SpringDamper(hertz, dampingRatio, position, velocity, timeStep Q) Q

+ func TimeToSleep() Q

+ func UnwindAngle(t Q) Q

+ type QueryFilter struct

+ CategoryBits uint64

+ MaskBits uint64

+ func DefaultQueryFilter() QueryFilter

+ type RayCastInput struct

+ MaxFraction Q

+ Origin Vec2

+ Translation Vec2

+ type Rot = fixed.Rot

+ func ComputeRotationBetweenUnitVectors(v1, v2 Vec2) Rot

+ func IntegrateRotation(q1 Rot, deltaAngle Q) Rot

+ func InvMulRot(q, r Rot) Rot

+ func MakeRot(t Q) Rot

+ func MulRot(q, r Rot) Rot

+ func NLerp(q1, q2 Rot, t Q) Rot

+ func NormalizeRot(q Rot) Rot

+ func RotIdentity() Rot

+ type Segment struct

+ Point1 Vec2

+ Point2 Vec2

+ type ShapeCastInput struct

+ CanEncroach bool

+ MaxFraction Q

+ Proxy ShapeProxy

+ Translation Vec2

+ type ShapeDef struct

+ Density Q

+ EnableContactEvents bool

+ EnableHitEvents bool

+ EnablePreSolveEvents bool

+ EnableSensorEvents bool

+ Filter Filter

+ InvokeContactCreation bool

+ IsSensor bool

+ Material SurfaceMaterial

+ UpdateBodyMass bool

+ UserData any

+ func DefaultShapeDef() ShapeDef

+ type ShapeId struct

+ func CreateCapsuleShape(bodyId BodyId, def *ShapeDef, capsule *Capsule) ShapeId

+ func CreateCircleShape(bodyId BodyId, def *ShapeDef, circle *Circle) ShapeId

+ func CreatePolygonShape(bodyId BodyId, def *ShapeDef, polygon *Polygon) ShapeId

+ func CreateSegmentShape(bodyId BodyId, def *ShapeDef, segment *Segment) ShapeId

+ func LoadShapeId(x uint64) ShapeId

+ func (id ShapeId) IsNull() bool

+ func (id ShapeId) IsValid() bool

+ type ShapeProxy struct

+ Count int

+ Points [MaxPolygonVertices]Vec2

+ Radius Q

+ type ShapeType int

+ const CapsuleShape

+ const ChainSegmentShape

+ const CircleShape

+ const PolygonShape

+ const SegmentShape

+ const ShapeTypeCount

+ type SurfaceMaterial struct

+ CustomColor uint32

+ Friction Q

+ Restitution Q

+ RollingResistance Q

+ TangentSpeed Q

+ UserMaterialId int

+ func DefaultSurfaceMaterial() SurfaceMaterial

+ type Transform struct

+ P Vec2

+ Q Rot

+ func InvMulTransforms(a, b Transform) Transform

+ func MulTransforms(a, b Transform) Transform

+ func TransformIdentity() Transform

+ type Vec2 = fixed.Vec2

+ func AABBCenter(a AABB) Vec2

+ func AABBExtents(a AABB) Vec2

+ func Abs(a Vec2) Vec2

+ func Clamp(v, a, b Vec2) Vec2

+ func CrossSV(s Q, v Vec2) Vec2

+ func CrossVS(v Vec2, s Q) Vec2

+ func InvRotateVector(q Rot, v Vec2) Vec2

+ func InvTransformPoint(t Transform, p Vec2) Vec2

+ func LeftPerp(v Vec2) Vec2

+ func Lerp(a, b Vec2, t Q) Vec2

+ func Max(a, b Vec2) Vec2

+ func Min(a, b Vec2) Vec2

+ func Mul(a, b Vec2) Vec2

+ func MulAdd(a Vec2, s Q, b Vec2) Vec2

+ func MulMV(m Mat22, v Vec2) Vec2

+ func MulSub(a Vec2, s Q, b Vec2) Vec2

+ func Neg(a Vec2) Vec2

+ func RightPerp(v Vec2) Vec2

+ func RotGetXAxis(q Rot) Vec2

+ func RotGetYAxis(q Rot) Vec2

+ func RotateVector(q Rot, v Vec2) Vec2

+ func Solve22(m Mat22, b Vec2) Vec2

+ func TransformPoint(t Transform, p Vec2) Vec2

+ func Vec2Zero() Vec2

+ type Version struct

+ Major int

+ Minor int

+ Revision int

+ func ReferenceVersion() Version

+ type WorldDef struct

+ ContactDampingRatio Q

+ ContactHertz Q

+ EnableContinuous bool

+ EnableSleep bool

+ Gravity Vec2

+ HitEventThreshold Q

+ MaxContactPushSpeed Q

+ MaximumLinearSpeed Q

+ RestitutionThreshold Q

+ UserData any

+ func DefaultWorldDef() WorldDef

+ type WorldId struct

+ func CreateWorld(def *WorldDef) WorldId

+ func LoadWorldId(x uint32) WorldId

+ func (id WorldId) Gravity() Vec2

+ func (id WorldId) IsNull() bool

+ func (id WorldId) IsValid() bool

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