cp

package module
v0.0.0-...-c9079ed Latest Latest
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 Go to latest Published: Nov 8, 2017 License: MIT Imports: 4 Imported by: 0

README

cp

GoDoc

Chipmunk2D ported to Go

project status

Beta stage -- most features are implemented and the demos are very close to Chipmunk2D demos.

Some of the API may still change over time.

run the examples

go get github.com/jakecoffman/cp
cd $GOPATH/src/github.com/jakecoffman/cp/examples
go get -d ./...
go run logosmash/logosmash.go

documentation

The official chipmunk docs are a really good place to start: https://chipmunk-physics.net/release/ChipmunkLatest-Docs/

features

  • Designed specifically for 2D video games.
  • Circle, convex polygon, and beveled line segment collision primitives.
  • Multiple collision primitives can be attached to a single rigid body.
  • Fast broad phase collision detection by using a bounding box tree with great temporal coherence or a spatial hash.
  • Extremely fast impulse solving by utilizing Erin Catto’s contact persistence algorithm.
  • Supports sleeping objects that have come to rest to reduce the CPU load.
  • Support for collision event callbacks based on user definable object types types.
  • Flexible collision filtering system with layers, exclusion groups and callbacks.
  • Can be used to create all sorts of effects like one way platforms or buoyancy areas. (Examples included)
  • Supports nearest point, segment (raycasting), shape and bounding box queries to the collision detection system.
  • Collision impulses amounts can be retrieved for gameplay effects, sound effects, etc.
  • Large variety of joints – easily make vehicles, ragdolls, and more.
  • Joint callbacks.
  • Can be used to easily implement breakable or animated joints. (Examples included)
  • Maintains a contact graph of all colliding objects.
  • No external dependencies.
  • Many language bindings available.
  • Simple, read the documentation and see!
  • Unrestrictive MIT license

Documentation

Index

Constants

View Source 
const (
	BODY_DYNAMIC = iota
	BODY_KINEMATIC
	BODY_STATIC
)

body types

View Source 
const (
	MAX_GJK_ITERATIONS  = 30
	MAX_EPA_ITERATIONS  = 30
	WARN_GJK_ITERATIONS = 20
	WARN_EPA_ITERATIONS = 20
)
View Source 
const (
	DRAW_SHAPES           = 1 << 0
	DRAW_CONSTRAINTS      = 1 << 1
	DRAW_COLLISION_POINTS = 1 << 2
)

Draw flags

View Source 
const (
	INFINITY      = math.MaxFloat64
	MAGIC_EPSILON = 1e-5

	RadianConst = math.Pi / 180
	DegreeConst = 180 / math.Pi

	POOLED_BUFFER_SIZE = 1024
)
View Source 
const (
	// Arbiter is active and its the first collision.
	CP_ARBITER_STATE_FIRST_COLLISION = iota
	// Arbiter is active and its not the first collision.
	CP_ARBITER_STATE_NORMAL
	// Collision has been explicitly ignored.
	// Either by returning false from a begin collision handler or calling cpArbiterIgnore().
	CP_ARBITER_STATE_IGNORE
	// Collison is no longer active. A space will cache an arbiter for up to cpSpace.collisionPersistence more steps.
	CP_ARBITER_STATE_CACHED
	// Collison arbiter is invalid because one of the shapes was removed.
	CP_ARBITER_STATE_INVALIDATED
)

Arbiter states

View Source 
const CONTACTS_BUFFER_SIZE = 1024
View Source 
const HASH_COEF = 3344921057
View Source 
const MAX_CONTACTS_PER_ARBITER = 2
View Source 
const (
	SHAPE_TYPE_NUM = 3
)

Variables

View Source 
var (
	NO_GROUP       uint = 0
	ALL_CATEGORIES uint = ^uint(0)
)
View Source 
var BuiltinCollisionFuncs [9]CollisionFunc = [9]CollisionFunc{
	CircleToCircle,
	CollisionError,
	CollisionError,
	CircleToSegment,
	SegmentToSegment,
	CollisionError,
	CircleToPoly,
	SegmentToPoly,
	PolyToPoly,
}
View Source 
var SHAPE_FILTER_ALL = ShapeFilter{NO_GROUP, ALL_CATEGORIES, ALL_CATEGORIES}
View Source 
var SHAPE_FILTER_NONE = ShapeFilter{NO_GROUP, ^ALL_CATEGORIES, ^ALL_CATEGORIES}
View Source 
var ShapeUpdateFunc = func(shape *Shape) {
	shape.CacheBB()
}
View Source 
var ShapeVelocityFunc = func(obj interface{}) Vector {
	return obj.(*Shape).body.v
}

Functions

func AlwaysCollide 

func AlwaysCollide(_ *Arbiter, _ *Space, _ interface{}) bool

func AreaForCircle 

func AreaForCircle(r1, r2 float64) float64

func AreaForPoly 

func AreaForPoly(count int, verts []Vector, r float64) float64

func AreaForSegment 

func AreaForSegment(a, b Vector, r float64) float64

func BodyUpdatePosition 

func BodyUpdatePosition(body *Body, dt float64)

func BodyUpdateVelocity 

func BodyUpdateVelocity(body *Body, gravity Vector, damping, dt float64)

func CachedArbitersFilter 

func CachedArbitersFilter(arb *Arbiter, space *Space, shape *Shape, body *Body) bool

func CircleSegmentQuery 

func CircleSegmentQuery(shape *Shape, center Vector, r1 float64, a, b Vector, r2 float64, info *SegmentQueryInfo)

func CircleToCircle 

func CircleToCircle(a, b *Shape, info *CollisionInfo)

func CircleToPoly 

func CircleToPoly(a, b *Shape, info *CollisionInfo)

func CircleToSegment 

func CircleToSegment(a, b *Shape, info *CollisionInfo)

func Clamp 

func Clamp(f, min, max float64) float64

func Clamp01 

func Clamp01(f float64) float64

func CollisionError 

func CollisionError(a, b *Shape, info *CollisionInfo)

func ComponentActive 

func ComponentActive(root *Body, threshold float64) bool

func ContactPoints 

func ContactPoints(e1, e2 *Edge, points ClosestPoints, info *CollisionInfo)

Given two support edges, find contact point pairs on their surfaces.

func Contains 

func Contains(bodies []*Body, body *Body) bool

func ConvexHull 

func ConvexHull(count int, verts []Vector, first *int, tol float64) int

QuickHull seemed like a neat algorithm, and efficient-ish for large input sets. My implementation performs an in place reduction using the result array as scratch space.

func DebugInfo 

func DebugInfo(space *Space) string

func DefaultBegin 

func DefaultBegin(arb *Arbiter, space *Space, _ interface{}) bool

func DefaultPostSolve 

func DefaultPostSolve(arb *Arbiter, space *Space, _ interface{})

func DefaultPreSolve 

func DefaultPreSolve(arb *Arbiter, space *Space, _ interface{}) bool

func DefaultSeparate 

func DefaultSeparate(arb *Arbiter, space *Space, _ interface{})

func DefaultSpringForce 

func DefaultSpringForce(spring *DampedSpring, dist float64) float64

func DoNothing 

func DoNothing(_ *Arbiter, _ *Space, _ interface{})

func DrawConstraint 

func DrawConstraint(constraint *Constraint, options Drawer)

func DrawShape 

func DrawShape(shape *Shape, options Drawer)

func DrawSpace 

func DrawSpace(space *Space, options Drawer)

func FloodFillComponent 

func FloodFillComponent(root *Body, body *Body)

func Lerp 

func Lerp(f1, f2, t float64) float64

func LerpConst 

func LerpConst(f1, f2, d float64) float64

func LoopIndexes 

func LoopIndexes(verts []Vector, count int) (int, int)

func MomentForBox 

func MomentForBox(m, width, height float64) float64

func MomentForBox2 

func MomentForBox2(m float64, box BB) float64

func MomentForCircle 

func MomentForCircle(m, r1, r2 float64, offset Vector) float64

func MomentForPoly 

func MomentForPoly(m float64, count int, verts []Vector, offset Vector, r float64) float64

func MomentForSegment 

func MomentForSegment(m float64, a, b Vector, r float64) float64

func NearestPointQueryNearest 

func NearestPointQueryNearest(obj interface{}, shape *Shape, collisionId uint32, out interface{}) uint32

func NodeSetA 

func NodeSetA(node, value *Node)

func NodeSetB 

func NodeSetB(node, value *Node)

func PolySupportPointIndex 

func PolySupportPointIndex(count int, planes []SplittingPlane, n Vector) int

func PolyToPoly 

func PolyToPoly(a, b *Shape, info *CollisionInfo)

func PostStepDoNothing 

func PostStepDoNothing(space *Space, key, data interface{})

func QHullPartition 

func QHullPartition(verts []Vector, count int, a, b Vector, tol float64) int

func QHullReduce 

func QHullReduce(tol float64, verts []Vector, count int, a, pivot, b Vector, result []Vector) int

func QueryReject 

func QueryReject(a, b *Shape) bool

func QueryRejectConstraints 

func QueryRejectConstraints(a, b *Body) bool

func SegmentToPoly 

func SegmentToPoly(seg, poly *Shape, info *CollisionInfo)

func SegmentToSegment 

func SegmentToSegment(a, b *Shape, info *CollisionInfo)

func SpaceArbiterSetFilter 

func SpaceArbiterSetFilter(arb *Arbiter, space *Space) bool

Hashset filter func to throw away old arbiters.

func SpaceCollideShapesFunc 

func SpaceCollideShapesFunc(obj interface{}, b *Shape, collisionId uint32, vspace interface{}) uint32

func VoidQueryFunc 

func VoidQueryFunc(obj1 interface{}, obj2 *Shape, collisionId uint32, data interface{}) uint32

Types

type Arbiter 

type Arbiter struct {
	UserData interface{}
	// contains filtered or unexported fields
}

func ArbiterNext 

func ArbiterNext(arb *Arbiter, body *Body) *Arbiter

func SpaceArbiterSetTrans 

func SpaceArbiterSetTrans(shapes []*Shape, space *Space) *Arbiter

func (*Arbiter) ApplyCachedImpulse 

func (arbiter *Arbiter) ApplyCachedImpulse(dt_coef float64)

func (*Arbiter) ApplyImpulse 

func (arbiter *Arbiter) ApplyImpulse()

func (*Arbiter) Bodies 

func (arb *Arbiter) Bodies() (*Body, *Body)

func (*Arbiter) CallWildcardBeginA 

func (arb *Arbiter) CallWildcardBeginA(space *Space) bool

func (*Arbiter) CallWildcardBeginB 

func (arb *Arbiter) CallWildcardBeginB(space *Space) bool

func (*Arbiter) CallWildcardPostSolveA 

func (arb *Arbiter) CallWildcardPostSolveA(space *Space)

func (*Arbiter) CallWildcardPostSolveB 

func (arb *Arbiter) CallWildcardPostSolveB(space *Space)

func (*Arbiter) CallWildcardPreSolveA 

func (arb *Arbiter) CallWildcardPreSolveA(space *Space) bool

func (*Arbiter) CallWildcardPreSolveB 

func (arb *Arbiter) CallWildcardPreSolveB(space *Space) bool

func (*Arbiter) CallWildcardSeparateA 

func (arb *Arbiter) CallWildcardSeparateA(space *Space)

func (*Arbiter) CallWildcardSeparateB 

func (arb *Arbiter) CallWildcardSeparateB(space *Space)

func (*Arbiter) ContactPointSet 

func (arb *Arbiter) ContactPointSet() ContactPointSet

func (*Arbiter) Count 

func (arb *Arbiter) Count() int

func (*Arbiter) Ignore 

func (arb *Arbiter) Ignore() bool

func (*Arbiter) Init 

func (arbiter *Arbiter) Init(a, b *Shape) *Arbiter

func (*Arbiter) IsFirstContact 

func (arbiter *Arbiter) IsFirstContact() bool

func (*Arbiter) Next 

func (node *Arbiter) Next(body *Body) *Arbiter

func (*Arbiter) Normal 

func (arb *Arbiter) Normal() Vector

func (*Arbiter) PreStep 

func (arb *Arbiter) PreStep(dt, slop, bias float64)

func (*Arbiter) SetContactPointSet 

func (arb *Arbiter) SetContactPointSet(set *ContactPointSet)

func (*Arbiter) Shapes 

func (arb *Arbiter) Shapes() (*Shape, *Shape)

func (*Arbiter) ThreadForBody 

func (arbiter *Arbiter) ThreadForBody(body *Body) *ArbiterThread

func (*Arbiter) TotalImpulse 

func (arb *Arbiter) TotalImpulse() Vector

func (*Arbiter) Unthread 

func (arbiter *Arbiter) Unthread()

func (*Arbiter) Update 

func (arb *Arbiter) Update(info *CollisionInfo, space *Space)

type ArbiterThread 

type ArbiterThread struct {
	// contains filtered or unexported fields
}

type BB 

type BB struct {
	L, B, R, T float64
}

func NewBBForCircle 

func NewBBForCircle(p Vector, r float64) BB

func NewBBForExtents 

func NewBBForExtents(c Vector, hw, hh float64) BB

func ShapeGetBB 

func ShapeGetBB(obj *Shape) BB

func (BB) Area 

func (bb BB) Area() float64

func (BB) Center 

func (bb BB) Center() Vector

func (BB) ClampVect 

func (bb BB) ClampVect(v *Vector) Vector

func (BB) Contains 

func (bb BB) Contains(other BB) bool

func (BB) ContainsVect 

func (bb BB) ContainsVect(v Vector) bool

func (BB) Expand 

func (bb BB) Expand(v Vector) BB

func (BB) Intersects 

func (a BB) Intersects(b BB) bool

func (BB) IntersectsSegment 

func (bb BB) IntersectsSegment(a, b Vector) bool

func (BB) Merge 

func (a BB) Merge(b BB) BB

func (BB) MergedArea 

func (a BB) MergedArea(b BB) float64

func (BB) Offset 

func (bb BB) Offset(v Vector) BB

func (BB) Proximity 

func (a BB) Proximity(b BB) float64

func (BB) SegmentQuery 

func (bb BB) SegmentQuery(a, b Vector) float64

func (BB) String 

func (bb BB) String() string

func (BB) WrapVect 

func (bb BB) WrapVect(v Vector) Vector

type BBTree 

type BBTree struct {
	// contains filtered or unexported fields
}

func (*BBTree) Contains 

func (tree *BBTree) Contains(obj *Shape, hashId HashValue) bool

func (*BBTree) Count 

func (tree *BBTree) Count() int

func (*BBTree) Destroy 

func (tree *BBTree) Destroy()

func (*BBTree) Each 

func (tree *BBTree) Each(f SpatialIndexIterator)

func (*BBTree) GetBB 

func (tree *BBTree) GetBB(obj *Shape) BB

func (*BBTree) GetMasterTree 

func (tree *BBTree) GetMasterTree() *BBTree

func (*BBTree) IncrementStamp 

func (tree *BBTree) IncrementStamp()

func (*BBTree) Insert 

func (tree *BBTree) Insert(obj *Shape, hashId HashValue)

func (*BBTree) LeafAddPairs 

func (tree *BBTree) LeafAddPairs(leaf *Node)

func (*BBTree) LeafUpdate 

func (tree *BBTree) LeafUpdate(leaf *Node) bool

func (*BBTree) NewLeaf 

func (tree *BBTree) NewLeaf(obj *Shape) *Node

func (*BBTree) NewNode 

func (tree *BBTree) NewNode(a, b *Node) *Node

func (*BBTree) NodeFromPool 

func (tree *BBTree) NodeFromPool() *Node

func (*BBTree) PairFromPool 

func (subtree *BBTree) PairFromPool() *Pair

func (*BBTree) PairInsert 

func (tree *BBTree) PairInsert(a *Node, b *Node)

func (*BBTree) PairsClear 

func (tree *BBTree) PairsClear(leaf *Node)

func (*BBTree) Query 

func (tree *BBTree) Query(obj interface{}, bb BB, f SpatialIndexQuery, data interface{})

func (*BBTree) RecycleNode 

func (tree *BBTree) RecycleNode(node *Node)

func (*BBTree) RecyclePair 

func (tree *BBTree) RecyclePair(pair *Pair)

func (*BBTree) Reindex 

func (tree *BBTree) Reindex()

func (*BBTree) ReindexObject 

func (tree *BBTree) ReindexObject(obj *Shape, hashId HashValue)

func (*BBTree) ReindexQuery 

func (tree *BBTree) ReindexQuery(f SpatialIndexQuery, data interface{})

func (*BBTree) Remove 

func (tree *BBTree) Remove(obj *Shape, hashId HashValue)

func (*BBTree) ReplaceChild 

func (tree *BBTree) ReplaceChild(parent, child, value *Node)

func (*BBTree) SegmentQuery 

func (tree *BBTree) SegmentQuery(obj interface{}, a, b Vector, t_exit float64, f SpatialIndexSegmentQuery, data interface{})

func (*BBTree) SubtreeInsert 

func (tree *BBTree) SubtreeInsert(subtree *Node, leaf *Node) *Node

func (*BBTree) SubtreeRemove 

func (tree *BBTree) SubtreeRemove(subtree *Node, leaf *Node) *Node

type BBTreeVelocityFunc 

type BBTreeVelocityFunc func(obj interface{}) Vector

type Body 

type Body struct {
	UserData interface{}
	// contains filtered or unexported fields
}

func NewBody 

func NewBody(mass, moment float64) *Body

func NewKinematicBody 

func NewKinematicBody() *Body

func NewStaticBody 

func NewStaticBody() *Body

func (*Body) AccumulateMassFromShapes 

func (body *Body) AccumulateMassFromShapes()

Should *only* be called when shapes with mass info are modified, added or removed.

func (*Body) Activate 

func (body *Body) Activate()

func (*Body) ActivateStatic 

func (body *Body) ActivateStatic(filter *Shape)

func (*Body) AddShape 

func (body *Body) AddShape(shape *Shape) *Shape

func (*Body) Angle 

func (body *Body) Angle() float64

func (*Body) AngularVelocity 

func (body *Body) AngularVelocity() float64

func (*Body) ApplyForceAtLocalPoint 

func (body *Body) ApplyForceAtLocalPoint(force, point Vector)

func (*Body) ApplyForceAtWorldPoint 

func (body *Body) ApplyForceAtWorldPoint(force, point Vector)

func (*Body) ApplyImpulseAtLocalPoint 

func (body *Body) ApplyImpulseAtLocalPoint(impulse, point Vector)

func (*Body) ApplyImpulseAtWorldPoint 

func (body *Body) ApplyImpulseAtWorldPoint(impulse, point Vector)

func (Body) CenterOfGravity 

func (body Body) CenterOfGravity() Vector

func (*Body) ComponentAdd 

func (root *Body) ComponentAdd(body *Body)

func (*Body) ComponentRoot 

func (body *Body) ComponentRoot() *Body

func (*Body) EachArbiter 

func (body *Body) EachArbiter(f func(*Arbiter))

func (*Body) EachConstraint 

func (body *Body) EachConstraint(f func(*Constraint))

func (*Body) EachShape 

func (body *Body) EachShape(f func(*Shape))

func (*Body) Force 

func (body *Body) Force() Vector

func (*Body) GetType 

func (body *Body) GetType() int

func (*Body) IdleTime 

func (body *Body) IdleTime() float64

func (*Body) IsSleeping 

func (body *Body) IsSleeping() bool

func (*Body) KineticEnergy 

func (body *Body) KineticEnergy() float64

func (*Body) LocalToWorld 

func (body *Body) LocalToWorld(point Vector) Vector

func (*Body) Mass 

func (body *Body) Mass() float64

func (Body) Moment 

func (body Body) Moment() float64

func (*Body) Position 

func (body *Body) Position() Vector

func (*Body) PushArbiter 

func (body *Body) PushArbiter(arb *Arbiter)

func (*Body) RemoveConstraint 

func (body *Body) RemoveConstraint(constraint *Constraint)

func (*Body) RemoveShape 

func (body *Body) RemoveShape(shape *Shape)

func (*Body) Rotation 

func (body *Body) Rotation() Vector

func (*Body) SetAngle 

func (body *Body) SetAngle(angle float64)

func (*Body) SetAngularVelocity 

func (body *Body) SetAngularVelocity(angularVelocity float64)

func (*Body) SetForce 

func (body *Body) SetForce(force Vector)

func (*Body) SetMass 

func (body *Body) SetMass(mass float64)

func (*Body) SetMoment 

func (body *Body) SetMoment(moment float64)

func (*Body) SetPosition 

func (body *Body) SetPosition(position Vector)

func (*Body) SetPositionUpdateFunc 

func (body *Body) SetPositionUpdateFunc(f BodyPositionFunc)

func (*Body) SetTransform 

func (body *Body) SetTransform(p Vector, a float64)

func (*Body) SetType 

func (body *Body) SetType(newType int)

func (*Body) SetVelocity 

func (body *Body) SetVelocity(x, y float64)

func (*Body) SetVelocityUpdateFunc 

func (body *Body) SetVelocityUpdateFunc(f BodyVelocityFunc)

func (*Body) SetVelocityVector 

func (body *Body) SetVelocityVector(v Vector)

func (Body) String 

func (b Body) String() string

func (*Body) UpdateVelocity 

func (body *Body) UpdateVelocity(gravity Vector, damping, dt float64)

func (*Body) Velocity 

func (body *Body) Velocity() Vector

func (*Body) VelocityAtLocalPoint 

func (body *Body) VelocityAtLocalPoint(point Vector) Vector

func (*Body) VelocityAtWorldPoint 

func (body *Body) VelocityAtWorldPoint(point Vector) Vector

func (*Body) WorldToLocal 

func (body *Body) WorldToLocal(point Vector) Vector

type BodyPositionFunc 

type BodyPositionFunc func(body *Body, dt float64)

/ Rigid body position update function type.

type BodyVelocityFunc 

type BodyVelocityFunc func(body *Body, gravity Vector, damping float64, dt float64)

/ Rigid body velocity update function type.

type Children 

type Children struct {
	// contains filtered or unexported fields
}

type Circle 

type Circle struct {
	*Shape
	// contains filtered or unexported fields
}

func (*Circle) CacheData 

func (circle *Circle) CacheData(transform Transform) BB

func (*Circle) Destroy 

func (*Circle) Destroy()

func (*Circle) PointQuery 

func (circle *Circle) PointQuery(p Vector, info *PointQueryInfo)

func (*Circle) Radius 

func (circle *Circle) Radius() float64

func (*Circle) SegmentQuery 

func (circle *Circle) SegmentQuery(a, b Vector, radius float64, info *SegmentQueryInfo)

func (*Circle) SetRadius 

func (circle *Circle) SetRadius(r float64)

func (*Circle) TransformC 

func (circle *Circle) TransformC() Vector

type ClosestPoints 

type ClosestPoints struct {
	// contains filtered or unexported fields
}

func EPA 

func EPA(ctx *SupportContext, v0 MinkowskiPoint, v1 MinkowskiPoint, v2 MinkowskiPoint) ClosestPoints

Find the closest points on the surface of two overlapping shapes using the EPA algorithm. EPA is called from GJK when two shapes overlap. This is a moderately expensive step! Avoid it by adding radii to your shapes so their inner polygons won't overlap.

func EPARecurse 

func EPARecurse(ctx *SupportContext, count int, hull []MinkowskiPoint, iteration int) ClosestPoints

Recursive implementation of the EPA loop. Each recursion adds a point to the convex hull until it's known that we have the closest point on the surface.

func GJK 

func GJK(ctx *SupportContext, collisionId *uint32) ClosestPoints

Find the closest points between two shapes using the GJK algorithm.

func GJKRecurse 

func GJKRecurse(ctx *SupportContext, v0, v1 MinkowskiPoint, iteration int) ClosestPoints

Recursive implementation of the GJK loop.

type CollisionBeginFunc 

type CollisionBeginFunc func(arb *Arbiter, space *Space, userData interface{}) bool

type CollisionFunc 

type CollisionFunc func(a, b *Shape, info *CollisionInfo)

type CollisionHandler 

type CollisionHandler struct {
	/// Collision type identifier of the first shape that this handler recognizes.
	/// In the collision handler callback, the shape with this type will be the first argument. Read only.
	TypeA CollisionType
	/// Collision type identifier of the second shape that this handler recognizes.
	/// In the collision handler callback, the shape with this type will be the second argument. Read only.
	TypeB CollisionType
	/// This function is called when two shapes with types that match this collision handler begin colliding.
	BeginFunc CollisionBeginFunc
	/// This function is called each step when two shapes with types that match this collision handler are colliding.
	/// It's called before the collision solver runs so that you can affect a collision's outcome.
	PreSolveFunc CollisionPreSolveFunc
	/// This function is called each step when two shapes with types that match this collision handler are colliding.
	/// It's called after the collision solver runs so that you can read back information about the collision to trigger events in your game.
	PostSolveFunc CollisionPostSolveFunc
	/// This function is called when two shapes with types that match this collision handler stop colliding.
	SeparateFunc CollisionSeparateFunc
	/// This is a user definable context pointer that is passed to all of the collision handler functions.
	UserData interface{}
}

/ Struct that holds function callback pointers to configure custom collision handling. / Collision handlers have a pair of types; when a collision occurs between two shapes that have these types, the collision handler functions are triggered. 

var CollisionHandlerDefault CollisionHandler = CollisionHandler{
	WILDCARD_COLLISION_TYPE,
	WILDCARD_COLLISION_TYPE,
	DefaultBegin,
	DefaultPreSolve,
	DefaultPostSolve,
	DefaultSeparate,
	nil,
}
var CollisionHandlerDoNothing CollisionHandler = CollisionHandler{
	WILDCARD_COLLISION_TYPE,
	WILDCARD_COLLISION_TYPE,
	AlwaysCollide,
	AlwaysCollide,
	DoNothing,
	DoNothing,
	nil,
}

type CollisionInfo 

type CollisionInfo struct {
	// contains filtered or unexported fields
}

func Collide 

func Collide(a, b *Shape, collisionId uint32, contacts []Contact) *CollisionInfo

func (*CollisionInfo) PushContact 

func (info *CollisionInfo) PushContact(p1, p2 Vector, hash HashValue)

type CollisionPostSolveFunc 

type CollisionPostSolveFunc func(arb *Arbiter, space *Space, userData interface{})

type CollisionPreSolveFunc 

type CollisionPreSolveFunc func(arb *Arbiter, space *Space, userData interface{}) bool

type CollisionSeparateFunc 

type CollisionSeparateFunc func(arb *Arbiter, space *Space, userData interface{})

type CollisionType 

type CollisionType uintptr
var WILDCARD_COLLISION_TYPE CollisionType = ^CollisionType(0)

type Constrainer 

type Constrainer interface {
	PreStep(dt float64)
	ApplyCachedImpulse(dt_coef float64)
	ApplyImpulse(dt float64)
	GetImpulse() float64
}

type Constraint 

type Constraint struct {
	Class Constrainer

	PreSolve  ConstraintPreSolveFunc
	PostSolve ConstraintPostSolveFunc
	// contains filtered or unexported fields
}

func NewConstraint 

func NewConstraint(class Constrainer, a, b *Body) *Constraint

func NewDampedRotarySpring 

func NewDampedRotarySpring(a, b *Body, restAngle, stiffness, damping float64) *Constraint

func NewDampedSpring 

func NewDampedSpring(a, b *Body, anchorA, anchorB Vector, restLength, stiffness, damping float64) *Constraint

func NewGearJoint 

func NewGearJoint(a, b *Body, phase, ratio float64) *Constraint

func NewGrooveJoint 

func NewGrooveJoint(a, b *Body, grooveA, grooveB, anchorB Vector) *Constraint

func NewPinJoint 

func NewPinJoint(a, b *Body, anchorA, anchorB Vector) *Constraint

func NewPivotJoint 

func NewPivotJoint(a, b *Body, pivot Vector) *Constraint

func NewPivotJoint2 

func NewPivotJoint2(a, b *Body, anchorA, anchorB Vector) *Constraint

func NewRatchetJoint 

func NewRatchetJoint(a, b *Body, phase, ratchet float64) *Constraint

func NewRotaryLimitJoint 

func NewRotaryLimitJoint(a, b *Body, min, max float64) *Constraint

func NewSimpleMotor 

func NewSimpleMotor(a, b *Body, rate float64) *Constraint

func NewSlideJoint 

func NewSlideJoint(a, b *Body, anchorA, anchorB Vector, min, max float64) *Constraint

func (*Constraint) ActivateBodies 

func (c *Constraint) ActivateBodies()

func (Constraint) ErrorBias 

func (c Constraint) ErrorBias() float64

func (Constraint) MaxBias 

func (c Constraint) MaxBias() float64

func (Constraint) MaxForce 

func (c Constraint) MaxForce() float64

func (*Constraint) Next 

func (c *Constraint) Next(body *Body) *Constraint

func (*Constraint) SetCollideBodies 

func (c *Constraint) SetCollideBodies(collideBodies bool)

func (*Constraint) SetErrorBias 

func (c *Constraint) SetErrorBias(errorBias float64)

func (*Constraint) SetMaxBias 

func (c *Constraint) SetMaxBias(max float64)

func (*Constraint) SetMaxForce 

func (c *Constraint) SetMaxForce(max float64)

type ConstraintPostSolveFunc 

type ConstraintPostSolveFunc func(*Constraint, *Space)

type ConstraintPreSolveFunc 

type ConstraintPreSolveFunc func(*Constraint, *Space)

type Contact 

type Contact struct {
	// contains filtered or unexported fields
}

func (*Contact) Clone 

func (c *Contact) Clone() Contact

type ContactBuffer 

type ContactBuffer struct {
	// contains filtered or unexported fields
}

func NewContactBuffer 

func NewContactBuffer(stamp uint, slice *ContactBuffer) *ContactBuffer

func (*ContactBuffer) InitHeader 

func (c *ContactBuffer) InitHeader(stamp uint, splice *ContactBuffer) *ContactBuffer

type ContactPointSet 

type ContactPointSet struct {
	Count  int
	Normal Vector

	Points [MAX_CONTACTS_PER_ARBITER]struct {
		/// The position of the contact on the surface of each shape.
		PointA, PointB Vector
		/// Penetration distance of the two shapes. Overlapping means it will be negative.
		/// This value is calculated as cpvdot(cpvsub(point2, point1), normal) and is ignored by cpArbiterSetContactPointSet().
		Distance float64
	}
}

type DampedRotarySpring 

type DampedRotarySpring struct {
	*Constraint

	RestAngle, Stiffness, Damping float64
	SpringTorqueFunc              func(spring *DampedRotarySpring, relativeAngle float64) float64
	// contains filtered or unexported fields
}

func (*DampedRotarySpring) ApplyCachedImpulse 

func (joint *DampedRotarySpring) ApplyCachedImpulse(dt_coef float64)

func (*DampedRotarySpring) ApplyImpulse 

func (spring *DampedRotarySpring) ApplyImpulse(dt float64)

func (*DampedRotarySpring) GetImpulse 

func (joint *DampedRotarySpring) GetImpulse() float64

func (*DampedRotarySpring) PreStep 

func (spring *DampedRotarySpring) PreStep(dt float64)

type DampedSpring 

type DampedSpring struct {
	*Constraint

	AnchorA, AnchorB               Vector
	RestLength, Stiffness, Damping float64
	SpringForceFunc                DampedSpringForceFunc
	// contains filtered or unexported fields
}

func (*DampedSpring) ApplyCachedImpulse 

func (spring *DampedSpring) ApplyCachedImpulse(dt_coef float64)

func (*DampedSpring) ApplyImpulse 

func (spring *DampedSpring) ApplyImpulse(dt float64)

func (*DampedSpring) GetImpulse 

func (spring *DampedSpring) GetImpulse() float64

func (*DampedSpring) PreStep 

func (spring *DampedSpring) PreStep(dt float64)

type DampedSpringForceFunc 

type DampedSpringForceFunc func(spring *DampedSpring, dist float64) float64

type Drawer 

type Drawer interface {
	DrawCircle(pos Vector, angle, radius float64, outline, fill FColor, data interface{})
	DrawSegment(a, b Vector, fill FColor, data interface{})
	DrawFatSegment(a, b Vector, radius float64, outline, fill FColor, data interface{})
	DrawPolygon(count int, verts []Vector, radius float64, outline, fill FColor, data interface{})
	DrawDot(size float64, pos Vector, fill FColor, data interface{})

	Flags() uint
	OutlineColor() FColor
	ShapeColor(shape *Shape, data interface{}) FColor
	ConstraintColor() FColor
	CollisionPointColor() FColor
	Data() interface{}
}

type Edge 

type Edge struct {
	// contains filtered or unexported fields
}

func SupportEdgeForPoly 

func SupportEdgeForPoly(poly *PolyShape, n Vector) *Edge

func SupportEdgeForSegment 

func SupportEdgeForSegment(seg *Segment, n Vector) *Edge

type EdgePoint 

type EdgePoint struct {
	// contains filtered or unexported fields
}

type FColor 

type FColor struct {
	R, G, B, A float32
}

16 bytes

type GearJoint 

type GearJoint struct {
	*Constraint
	// contains filtered or unexported fields
}

func (*GearJoint) ApplyCachedImpulse 

func (joint *GearJoint) ApplyCachedImpulse(dt_coef float64)

func (*GearJoint) ApplyImpulse 

func (joint *GearJoint) ApplyImpulse(dt float64)

func (*GearJoint) GetImpulse 

func (joint *GearJoint) GetImpulse() float64

func (*GearJoint) PreStep 

func (joint *GearJoint) PreStep(dt float64)

type GrooveJoint 

type GrooveJoint struct {
	*Constraint

	GrooveN, GrooveA, GrooveB Vector
	AnchorB                   Vector
	// contains filtered or unexported fields
}

func (*GrooveJoint) ApplyCachedImpulse 

func (joint *GrooveJoint) ApplyCachedImpulse(dt_coef float64)

func (*GrooveJoint) ApplyImpulse 

func (joint *GrooveJoint) ApplyImpulse(dt float64)

func (*GrooveJoint) GetImpulse 

func (joint *GrooveJoint) GetImpulse() float64

func (*GrooveJoint) PreStep 

func (joint *GrooveJoint) PreStep(dt float64)

type Handle 

type Handle struct {
	// contains filtered or unexported fields
}

func (*Handle) Init 

func (hand *Handle) Init(obj *Shape)

type HashSet 

type HashSet struct {
	// contains filtered or unexported fields
}

func NewHashSet 

func NewHashSet(eql HashSetEqual) *HashSet

func (*HashSet) Count 

func (set *HashSet) Count() uint

func (*HashSet) Each 

func (set *HashSet) Each(f HashSetIterator)

func (*HashSet) Filter 

func (set *HashSet) Filter(f HashSetFilter, data interface{})

func (*HashSet) Find 

func (set *HashSet) Find(hash HashValue, ptr interface{}) interface{}

func (*HashSet) Free 

func (set *HashSet) Free()

func (*HashSet) GetUnusedBin 

func (set *HashSet) GetUnusedBin() *HashSetBin

func (*HashSet) Insert 

func (set *HashSet) Insert(hash HashValue, ptr interface{}, trans HashSetTrans, data interface{}) interface{}

func (*HashSet) Recycle 

func (set *HashSet) Recycle(bin *HashSetBin)

func (*HashSet) Remove 

func (set *HashSet) Remove(hash HashValue, ptr interface{}) interface{}

func (*HashSet) Resize 

func (set *HashSet) Resize()

type HashSetArbiter 

type HashSetArbiter struct {
	// contains filtered or unexported fields
}

func NewHashSetArbiter 

func NewHashSetArbiter(eql HashSetEqualArbiter) *HashSetArbiter

func (*HashSetArbiter) Count 

func (set *HashSetArbiter) Count() uint

func (*HashSetArbiter) Each 

func (set *HashSetArbiter) Each(f HashSetIteratorArbiter)

func (*HashSetArbiter) Filter 

func (set *HashSetArbiter) Filter(filter func(arb *Arbiter) bool)

func (*HashSetArbiter) Find 

func (set *HashSetArbiter) Find(hash HashValue, ptr []*Shape) interface{}

func (*HashSetArbiter) Free 

func (set *HashSetArbiter) Free()

func (*HashSetArbiter) GetUnusedBin 

func (set *HashSetArbiter) GetUnusedBin() *HashSetBinArbiter

func (*HashSetArbiter) Insert 

func (set *HashSetArbiter) Insert(hash HashValue, ptr []*Shape, trans HashSetTransArbiter, space *Space) *Arbiter

func (*HashSetArbiter) InsertArb 

func (set *HashSetArbiter) InsertArb(hash HashValue, ptr []*Shape, arb *Arbiter) interface{}

func (*HashSetArbiter) Recycle 

func (set *HashSetArbiter) Recycle(bin *HashSetBinArbiter)

func (*HashSetArbiter) Remove 

func (set *HashSetArbiter) Remove(hash HashValue, ptr []*Shape) *Arbiter

func (*HashSetArbiter) Resize 

func (set *HashSetArbiter) Resize()

type HashSetBin 

type HashSetBin struct {
	// contains filtered or unexported fields
}

type HashSetBinArbiter 

type HashSetBinArbiter struct {
	// contains filtered or unexported fields
}

type HashSetBinCollisionHandler 

type HashSetBinCollisionHandler struct {
	// contains filtered or unexported fields
}

type HashSetBinHandle 

type HashSetBinHandle struct {
	// contains filtered or unexported fields
}

type HashSetCollisionHandler 

type HashSetCollisionHandler struct {
	// contains filtered or unexported fields
}

func NewHashSetCollisionHandler 

func NewHashSetCollisionHandler() *HashSetCollisionHandler

func (*HashSetCollisionHandler) Count 

func (set *HashSetCollisionHandler) Count() uint

func (*HashSetCollisionHandler) Each 

func (set *HashSetCollisionHandler) Each(f HashSetIterator)

func (*HashSetCollisionHandler) Find 

func (set *HashSetCollisionHandler) Find(hash HashValue, ptr *CollisionHandler) *CollisionHandler

func (*HashSetCollisionHandler) Insert 

func (set *HashSetCollisionHandler) Insert(hash HashValue, ptr *CollisionHandler) *CollisionHandler

func (*HashSetCollisionHandler) Resize 

func (set *HashSetCollisionHandler) Resize()

type HashSetEqual 

type HashSetEqual func(ptr, elt interface{}) bool

type HashSetEqualArbiter 

type HashSetEqualArbiter func(ptr []*Shape, elt *Arbiter) bool

type HashSetEqualCollisionHandler 

type HashSetEqualCollisionHandler func(ptr, elt interface{}) bool

type HashSetEqualHandle 

type HashSetEqualHandle func(ptr *Shape, elt *Handle) bool

type HashSetFilter 

type HashSetFilter func(elt, data interface{}) bool

type HashSetFilterArbiter 

type HashSetFilterArbiter func(arb *Arbiter, space *Space) bool

type HashSetFilterCollisionHandler 

type HashSetFilterCollisionHandler func(elt, data interface{}) bool

type HashSetFilterHandle 

type HashSetFilterHandle func(arb *Handle, space *Space) bool

type HashSetHandle 

type HashSetHandle struct {
	// contains filtered or unexported fields
}

func NewHashSetHandle 

func NewHashSetHandle(eql HashSetEqualHandle) *HashSetHandle

func (*HashSetHandle) Count 

func (set *HashSetHandle) Count() uint

func (*HashSetHandle) Each 

func (set *HashSetHandle) Each(f HashSetIteratorHandle)

func (*HashSetHandle) Find 

func (set *HashSetHandle) Find(hash HashValue, ptr *Shape) interface{}

func (*HashSetHandle) Free 

func (set *HashSetHandle) Free()

func (*HashSetHandle) GetUnusedBin 

func (set *HashSetHandle) GetUnusedBin() *HashSetBinHandle

func (*HashSetHandle) Insert 

func (set *HashSetHandle) Insert(hash HashValue, ptr *Shape, trans HashSetTransHandle, spaceHash *SpaceHash) *Handle

func (*HashSetHandle) InsertArb 

func (set *HashSetHandle) InsertArb(hash HashValue, ptr *Shape, arb *Handle) interface{}

func (*HashSetHandle) Recycle 

func (set *HashSetHandle) Recycle(bin *HashSetBinHandle)

func (*HashSetHandle) Remove 

func (set *HashSetHandle) Remove(hash HashValue, ptr *Shape) *Handle

func (*HashSetHandle) Resize 

func (set *HashSetHandle) Resize()

type HashSetIterator 

type HashSetIterator func(elt interface{})

type HashSetIteratorArbiter 

type HashSetIteratorArbiter func(elt *Arbiter)

type HashSetIteratorCollisionHandler 

type HashSetIteratorCollisionHandler func(elt interface{})

type HashSetIteratorHandle 

type HashSetIteratorHandle func(elt *Handle)

type HashSetTrans 

type HashSetTrans func(ptr, data interface{}) interface{}

type HashSetTransArbiter 

type HashSetTransArbiter func(ptr []*Shape, space *Space) *Arbiter

type HashSetTransCollisionHandler 

type HashSetTransCollisionHandler func(ptr, data interface{}) interface{}

type HashSetTransHandle 

type HashSetTransHandle func(ptr *Shape, hash *SpaceHash) *Handle

type HashValue 

type HashValue uintptr

func HashPair 

func HashPair(a, b HashValue) HashValue

type Leaf 

type Leaf struct {
	// contains filtered or unexported fields
}

type MarkContext 

type MarkContext struct {
	// contains filtered or unexported fields
}

type Mat2x2 

type Mat2x2 struct {
	// contains filtered or unexported fields
}

func (*Mat2x2) Transform 

func (m *Mat2x2) Transform(v Vector) Vector

type MinkowskiPoint 

type MinkowskiPoint struct {
	// contains filtered or unexported fields
}

A point on the surface of two shape's minkowski difference.

func NewMinkowskiPoint 

func NewMinkowskiPoint(a, b *SupportPoint) MinkowskiPoint

func (MinkowskiPoint) ClosestPoints 

func (v0 MinkowskiPoint) ClosestPoints(v1 MinkowskiPoint) ClosestPoints

Calculate the closest points on two shapes given the closest edge on their minkowski difference to (0, 0)

type Node 

type Node struct {
	Children
	Leaf
	// contains filtered or unexported fields
}

func (*Node) IsLeaf 

func (node *Node) IsLeaf() bool

func (*Node) MarkLeaf 

func (leaf *Node) MarkLeaf(context *MarkContext)

func (*Node) MarkLeafQuery 

func (subtree *Node) MarkLeafQuery(leaf *Node, left bool, context *MarkContext)

func (*Node) MarkSubtree 

func (subtree *Node) MarkSubtree(context *MarkContext)

func (*Node) Other 

func (node *Node) Other(child *Node) *Node

func (*Node) SubtreeQuery 

func (subtree *Node) SubtreeQuery(obj interface{}, bb BB, query SpatialIndexQuery, data interface{})

func (*Node) SubtreeSegmentQuery 

func (subtree *Node) SubtreeSegmentQuery(obj interface{}, a, b Vector, t_exit float64, f SpatialIndexSegmentQuery, data interface{}) float64

type Pair 

type Pair struct {
	// contains filtered or unexported fields
}

type PinJoint 

type PinJoint struct {
	*Constraint
	AnchorA, AnchorB Vector
	Dist             float64
	// contains filtered or unexported fields
}

func (*PinJoint) ApplyCachedImpulse 

func (joint *PinJoint) ApplyCachedImpulse(dt_coef float64)

func (*PinJoint) ApplyImpulse 

func (joint *PinJoint) ApplyImpulse(dt float64)

func (*PinJoint) GetImpulse 

func (joint *PinJoint) GetImpulse() float64

func (*PinJoint) PreStep 

func (joint *PinJoint) PreStep(dt float64)

type PivotJoint 

type PivotJoint struct {
	*Constraint
	AnchorA, AnchorB Vector
	// contains filtered or unexported fields
}

func (*PivotJoint) ApplyCachedImpulse 

func (joint *PivotJoint) ApplyCachedImpulse(dt_coef float64)

func (*PivotJoint) ApplyImpulse 

func (joint *PivotJoint) ApplyImpulse(dt float64)

func (*PivotJoint) GetImpulse 

func (joint *PivotJoint) GetImpulse() float64

func (*PivotJoint) PreStep 

func (joint *PivotJoint) PreStep(dt float64)

type PointQueryContext 

type PointQueryContext struct {
	// contains filtered or unexported fields
}

type PointQueryInfo 

type PointQueryInfo struct {
	/// The nearest shape, NULL if no shape was within range.
	Shape *Shape
	/// The closest point on the shape's surface. (in world space coordinates)
	Point Vector
	/// The distance to the point. The distance is negative if the point is inside the shape.
	Distance float64
	/// The gradient of the signed distance function.
	/// The value should be similar to info.p/info.d, but accurate even for very small values of info.d.
	Gradient Vector
}

type PolyShape 

type PolyShape struct {
	*Shape
	// contains filtered or unexported fields
}

func (*PolyShape) CacheData 

func (poly *PolyShape) CacheData(transform Transform) BB

func (PolyShape) Count 

func (poly PolyShape) Count() int

func (*PolyShape) Destroy 

func (poly *PolyShape) Destroy()

func (*PolyShape) PointQuery 

func (poly *PolyShape) PointQuery(p Vector, info *PointQueryInfo)

func (PolyShape) Radius 

func (poly PolyShape) Radius() float64

func (*PolyShape) SegmentQuery 

func (poly *PolyShape) SegmentQuery(a, b Vector, r2 float64, info *SegmentQueryInfo)

func (PolyShape) SetRadius 

func (poly PolyShape) SetRadius(r float64)

func (*PolyShape) SetVerts 

func (p *PolyShape) SetVerts(count int, verts []Vector)

func (*PolyShape) SetVertsRaw 

func (p *PolyShape) SetVertsRaw(count int, verts []Vector)

func (*PolyShape) SetVertsUnsafe 

func (p *PolyShape) SetVertsUnsafe(count int, verts []Vector, transform Transform)

func (PolyShape) TransformVert 

func (poly PolyShape) TransformVert(i int) Vector

func (PolyShape) Vert 

func (poly PolyShape) Vert(i int) Vector

type PostStepCallback 

type PostStepCallback struct {
	// contains filtered or unexported fields
}

type PostStepCallbackFunc 

type PostStepCallbackFunc func(space *Space, key interface{}, data interface{})

type RatchetJoint 

type RatchetJoint struct {
	*Constraint

	Angle, Phase, Ratchet float64
	// contains filtered or unexported fields
}

func (*RatchetJoint) ApplyCachedImpulse 

func (joint *RatchetJoint) ApplyCachedImpulse(dt_coef float64)

func (*RatchetJoint) ApplyImpulse 

func (joint *RatchetJoint) ApplyImpulse(dt float64)

func (*RatchetJoint) GetImpulse 

func (joint *RatchetJoint) GetImpulse() float64

func (*RatchetJoint) PreStep 

func (joint *RatchetJoint) PreStep(dt float64)

type RotaryLimitJoint 

type RotaryLimitJoint struct {
	*Constraint

	Min, Max float64
	// contains filtered or unexported fields
}

func (*RotaryLimitJoint) ApplyCachedImpulse 

func (joint *RotaryLimitJoint) ApplyCachedImpulse(dt_coef float64)

func (*RotaryLimitJoint) ApplyImpulse 

func (joint *RotaryLimitJoint) ApplyImpulse(dt float64)

func (*RotaryLimitJoint) GetImpulse 

func (joint *RotaryLimitJoint) GetImpulse() float64

func (*RotaryLimitJoint) PreStep 

func (joint *RotaryLimitJoint) PreStep(dt float64)

type Segment 

type Segment struct {
	*Shape
	// contains filtered or unexported fields
}

func (*Segment) A 

func (seg *Segment) A() Vector

func (*Segment) B 

func (seg *Segment) B() Vector

func (*Segment) CacheData 

func (seg *Segment) CacheData(transform Transform) BB

func (*Segment) Destroy 

func (seg *Segment) Destroy()

func (*Segment) Normal 

func (seg *Segment) Normal() Vector

func (*Segment) PointQuery 

func (seg *Segment) PointQuery(p Vector, info *PointQueryInfo)

func (*Segment) Radius 

func (seg *Segment) Radius() float64

func (*Segment) SegmentQuery 

func (seg *Segment) SegmentQuery(a, b Vector, r2 float64, info *SegmentQueryInfo)

func (*Segment) SetEndpoints 

func (seg *Segment) SetEndpoints(a, b Vector)

func (*Segment) SetRadius 

func (seg *Segment) SetRadius(r float64)

func (*Segment) TransformA 

func (seg *Segment) TransformA() Vector

func (*Segment) TransformB 

func (seg *Segment) TransformB() Vector

type SegmentQueryContext 

type SegmentQueryContext struct {
	// contains filtered or unexported fields
}

type SegmentQueryInfo 

type SegmentQueryInfo struct {
	/// The shape that was hit, or NULL if no collision occurred.
	Shape *Shape
	/// The point of impact.
	Point Vector
	/// The normal of the surface hit.
	Normal Vector
	/// The normalized distance along the query segment in the range [0, 1].
	Alpha float64
}

type Shape 

type Shape struct {
	Class ShapeClass

	UserData interface{}

	Filter ShapeFilter
	// contains filtered or unexported fields
}

func NewBox 

func NewBox(body *Body, w, h, r float64) *Shape

func NewBox2 

func NewBox2(body *Body, bb BB, r float64) *Shape

func NewCircle 

func NewCircle(body *Body, radius float64, offset Vector) *Shape

func NewPolyShape 

func NewPolyShape(body *Body, vectCount int, verts []Vector, transform Transform, radius float64) *Shape

func NewPolyShapeRaw 

func NewPolyShapeRaw(body *Body, count int, verts []Vector, radius float64) *Shape

func NewSegment 

func NewSegment(body *Body, a, b Vector, r float64) *Shape

func NewShape 

func NewShape(class ShapeClass, body *Body, massInfo *ShapeMassInfo) *Shape

func (*Shape) BB 

func (s *Shape) BB() BB

func (*Shape) Body 

func (s *Shape) Body() *Body

func (*Shape) CacheBB 

func (s *Shape) CacheBB() BB

func (*Shape) Elasticity 

func (s *Shape) Elasticity() float64

func (*Shape) Friction 

func (s *Shape) Friction() float64

func (*Shape) HashId 

func (s *Shape) HashId() HashValue

func (*Shape) MassInfo 

func (s *Shape) MassInfo() *ShapeMassInfo

func (*Shape) Order 

func (s *Shape) Order() int

func (*Shape) Point 

func (s *Shape) Point(i uint32) *SupportPoint

func (*Shape) PointQuery 

func (s *Shape) PointQuery(p Vector) PointQueryInfo

func (*Shape) SegmentQuery 

func (shape *Shape) SegmentQuery(a, b Vector, radius float64, info *SegmentQueryInfo) bool

func (*Shape) Sensor 

func (s *Shape) Sensor() bool

func (*Shape) SetBB 

func (s *Shape) SetBB(bb BB)

func (*Shape) SetCollisionType 

func (s *Shape) SetCollisionType(collisionType CollisionType)

func (*Shape) SetElasticity 

func (s *Shape) SetElasticity(e float64)

func (*Shape) SetFilter 

func (s *Shape) SetFilter(filter ShapeFilter)

func (*Shape) SetFriction 

func (s *Shape) SetFriction(u float64)

func (*Shape) SetHashId 

func (s *Shape) SetHashId(hashid HashValue)

func (*Shape) SetSensor 

func (s *Shape) SetSensor(sensor bool)

func (*Shape) SetSpace 

func (s *Shape) SetSpace(space *Space)

func (*Shape) SetSurfaceV 

func (s *Shape) SetSurfaceV(surfaceV Vector)

func (*Shape) Space 

func (s *Shape) Space() *Space

func (Shape) String 

func (s Shape) String() string

func (*Shape) Update 

func (s *Shape) Update(transform Transform) BB

type ShapeClass 

type ShapeClass interface {
	CacheData(transform Transform) BB
	Destroy()
	PointQuery(p Vector, info *PointQueryInfo)
	SegmentQuery(a, b Vector, radius float64, info *SegmentQueryInfo)
}

type ShapeFilter 

type ShapeFilter struct {
	/// Two objects with the same non-zero group value do not collide.
	/// This is generally used to group objects in a composite object together to disable self collisions.
	Group uint
	/// A bitmask of user definable categories that this object belongs to.
	/// The category/mask combinations of both objects in a collision must agree for a collision to occur.
	Categories uint
	/// A bitmask of user definable category types that this object object collides with.
	/// The category/mask combinations of both objects in a collision must agree for a collision to occur.
	Mask uint
}

func NewShapeFilter 

func NewShapeFilter(group, categories, mask uint) ShapeFilter

func (ShapeFilter) Reject 

func (a ShapeFilter) Reject(b ShapeFilter) bool

type ShapeMassInfo 

type ShapeMassInfo struct {
	// contains filtered or unexported fields
}

func CircleShapeMassInfo 

func CircleShapeMassInfo(mass, radius float64, center Vector) *ShapeMassInfo

func NewSegmentMassInfo 

func NewSegmentMassInfo(mass float64, a, b Vector, r float64) *ShapeMassInfo

func PolyShapeMassInfo 

func PolyShapeMassInfo(mass float64, count int, verts []Vector, r float64) *ShapeMassInfo

type Shaper 

type Shaper interface {
	Body() *Body
	MassInfo() *ShapeMassInfo
	HashId() HashValue
	SetHashId(HashValue)
	SetSpace(*Space)
	BB() BB
	SetBB(BB)
}

type SimpleMotor 

type SimpleMotor struct {
	*Constraint

	Rate float64
	// contains filtered or unexported fields
}

func (*SimpleMotor) ApplyCachedImpulse 

func (motor *SimpleMotor) ApplyCachedImpulse(dt_coef float64)

func (*SimpleMotor) ApplyImpulse 

func (motor *SimpleMotor) ApplyImpulse(dt float64)

func (*SimpleMotor) GetImpulse 

func (motor *SimpleMotor) GetImpulse() float64

func (*SimpleMotor) PreStep 

func (motor *SimpleMotor) PreStep(dt float64)

type SlideJoint 

type SlideJoint struct {
	*Constraint

	AnchorA, AnchorB Vector
	Min, Max         float64
	// contains filtered or unexported fields
}

func (*SlideJoint) ApplyCachedImpulse 

func (joint *SlideJoint) ApplyCachedImpulse(dt_coef float64)

func (*SlideJoint) ApplyImpulse 

func (joint *SlideJoint) ApplyImpulse(dt float64)

func (*SlideJoint) GetImpulse 

func (joint *SlideJoint) GetImpulse() float64

func (*SlideJoint) PreStep 

func (joint *SlideJoint) PreStep(dt float64)

type Space 

type Space struct {
	Iterations uint // must be non-zero

	SleepTimeThreshold float64

	StaticBody *Body
	// contains filtered or unexported fields
}

func NewSpace 

func NewSpace() *Space

func (*Space) Activate 

func (space *Space) Activate(body *Body)

func (*Space) AddBody 

func (space *Space) AddBody(body *Body) *Body

func (*Space) AddConstraint 

func (space *Space) AddConstraint(constraint *Constraint) *Constraint

func (*Space) AddPostStepCallback 

func (space *Space) AddPostStepCallback(f PostStepCallbackFunc, key, data interface{}) bool

func (*Space) AddShape 

func (space *Space) AddShape(shape *Shape) *Shape

func (*Space) ArrayForBodyType 

func (space *Space) ArrayForBodyType(bodyType int) *[]*Body

func (*Space) ContactBufferGetArray 

func (space *Space) ContactBufferGetArray() []Contact

func (*Space) ContainsBody 

func (space *Space) ContainsBody(body *Body) bool

func (*Space) ContainsConstraint 

func (space *Space) ContainsConstraint(constraint *Constraint) bool

func (*Space) ContainsShape 

func (space *Space) ContainsShape(shape *Shape) bool

func (*Space) Damping 

func (space *Space) Damping() float64

func (*Space) Deactivate 

func (space *Space) Deactivate(body *Body)

func (*Space) EachBody 

func (space *Space) EachBody(f func(body *Body))

func (*Space) EachConstraint 

func (space *Space) EachConstraint(f func(*Constraint))

func (*Space) EachShape 

func (space *Space) EachShape(f func(*Shape))

func (*Space) FilterArbiters 

func (space *Space) FilterArbiters(body *Body, filter *Shape)

func (*Space) Gravity 

func (space *Space) Gravity() Vector

func (*Space) Lock 

func (space *Space) Lock()

func (*Space) LookupHandler 

func (space *Space) LookupHandler(a, b CollisionType, defaultHandler *CollisionHandler) *CollisionHandler

func (*Space) NewCollisionHandler 

func (space *Space) NewCollisionHandler(collisionTypeA, collisionTypeB CollisionType) *CollisionHandler

func (*Space) NewWildcardCollisionHandler 

func (space *Space) NewWildcardCollisionHandler(collisionType CollisionType) *CollisionHandler

func (*Space) PointQueryNearest 

func (space *Space) PointQueryNearest(point Vector, maxDistance float64, filter ShapeFilter) *PointQueryInfo

func (*Space) PopContacts 

func (space *Space) PopContacts(count int)

func (*Space) PostStepCallback 

func (space *Space) PostStepCallback(key interface{}) *PostStepCallback

func (*Space) ProcessComponents 

func (space *Space) ProcessComponents(dt float64)

func (*Space) PushContacts 

func (space *Space) PushContacts(count int)

func (*Space) PushFreshContactBuffer 

func (space *Space) PushFreshContactBuffer()

func (*Space) RemoveBody 

func (space *Space) RemoveBody(body *Body)

func (*Space) RemoveConstraint 

func (space *Space) RemoveConstraint(constraint *Constraint)

func (*Space) RemoveShape 

func (space *Space) RemoveShape(shape *Shape)

func (*Space) SegmentQuery 

func (space *Space) SegmentQuery(start, end Vector, radius float64, filter ShapeFilter, f SpaceSegmentQueryFunc, data interface{})

func (*Space) SegmentQueryFirst 

func (space *Space) SegmentQueryFirst(start, end Vector, radius float64, filter ShapeFilter) SegmentQueryInfo

func (*Space) SetCollisionSlop 

func (space *Space) SetCollisionSlop(slop float64)

func (*Space) SetDamping 

func (space *Space) SetDamping(damping float64)

func (*Space) SetGravity 

func (space *Space) SetGravity(gravity Vector)

func (*Space) SetStaticBody 

func (space *Space) SetStaticBody(body *Body)

func (*Space) Step 

func (space *Space) Step(dt float64)

func (*Space) TimeStep 

func (space *Space) TimeStep() float64

func (*Space) UncacheArbiter 

func (space *Space) UncacheArbiter(arb *Arbiter)

func (*Space) Unlock 

func (space *Space) Unlock(runPostStep bool)

func (*Space) UseSpatialHash 

func (space *Space) UseSpatialHash(dim float64, count int)

func (*Space) UseWildcardDefaultHandler 

func (space *Space) UseWildcardDefaultHandler()

type SpaceHash 

type SpaceHash struct {
	*SpatialIndex
	// contains filtered or unexported fields
}

func (*SpaceHash) Contains 

func (hash *SpaceHash) Contains(obj *Shape, hashId HashValue) bool

func (*SpaceHash) Count 

func (hash *SpaceHash) Count() int

func (*SpaceHash) Destroy 

func (hash *SpaceHash) Destroy()

func (*SpaceHash) Each 

func (hash *SpaceHash) Each(f SpatialIndexIterator)

func (*SpaceHash) Insert 

func (hash *SpaceHash) Insert(obj *Shape, hashId HashValue)

func (*SpaceHash) Query 

func (hash *SpaceHash) Query(obj interface{}, bb BB, f SpatialIndexQuery, data interface{})

func (*SpaceHash) Reindex 

func (hash *SpaceHash) Reindex()

func (*SpaceHash) ReindexObject 

func (hash *SpaceHash) ReindexObject(obj *Shape, hashId HashValue)

func (*SpaceHash) ReindexQuery 

func (hash *SpaceHash) ReindexQuery(f SpatialIndexQuery, data interface{})

func (*SpaceHash) Remove 

func (hash *SpaceHash) Remove(obj *Shape, hashId HashValue)

func (*SpaceHash) SegmentQuery 

func (hash *SpaceHash) SegmentQuery(obj interface{}, a, b Vector, t_exit float64, f SpatialIndexSegmentQuery, data interface{})

modified from http://playtechs.blogspot.com/2007/03/raytracing-on-grid.html

type SpaceHashBin 

type SpaceHashBin struct {
	// contains filtered or unexported fields
}

type SpacePointQueryFunc 

type SpacePointQueryFunc func(*Shape, Vector, float64, Vector, interface{})

type SpaceSegmentQueryFunc 

type SpaceSegmentQueryFunc func(shape *Shape, point, normal Vector, alpha float64, data interface{})

type SpatialIndex 

type SpatialIndex struct {
	// contains filtered or unexported fields
}

func NewBBTree 

func NewBBTree(bbfunc SpatialIndexBB, staticIndex *SpatialIndex) *SpatialIndex

func NewSpaceHash 

func NewSpaceHash(celldim float64, num int, bbfunc SpatialIndexBB, staticIndex *SpatialIndex) *SpatialIndex

func NewSpatialIndex 

func NewSpatialIndex(klass SpatialIndexer, bbfunc SpatialIndexBB, staticIndex *SpatialIndex) *SpatialIndex

func (*SpatialIndex) CollideStatic 

func (dynamicIndex *SpatialIndex) CollideStatic(staticIndex *SpatialIndex, f SpatialIndexQuery, data interface{})

func (*SpatialIndex) GetRootIfTree 

func (index *SpatialIndex) GetRootIfTree() *Node

func (*SpatialIndex) GetTree 

func (index *SpatialIndex) GetTree() *BBTree

type SpatialIndexBB 

type SpatialIndexBB func(obj *Shape) BB

type SpatialIndexIterator 

type SpatialIndexIterator func(obj *Shape)

type SpatialIndexQuery 

type SpatialIndexQuery func(obj1 interface{}, obj2 *Shape, collisionId uint32, data interface{}) uint32

type SpatialIndexSegmentQuery 

type SpatialIndexSegmentQuery func(obj1 interface{}, obj2 *Shape, data interface{}) float64

type SpatialIndexer 

type SpatialIndexer interface {
	Destroy()
	Count() int
	Each(f SpatialIndexIterator)
	Contains(obj *Shape, hashId HashValue) bool
	Insert(obj *Shape, hashId HashValue)
	Remove(obj *Shape, hashId HashValue)
	Reindex()
	ReindexObject(obj *Shape, hashId HashValue)
	ReindexQuery(f SpatialIndexQuery, data interface{})
	Query(obj interface{}, bb BB, f SpatialIndexQuery, data interface{})
	SegmentQuery(obj interface{}, a, b Vector, t_exit float64, f SpatialIndexSegmentQuery, data interface{})
}

implemented by BBTree

type SplittingPlane 

type SplittingPlane struct {
	// contains filtered or unexported fields
}

type SupportContext 

type SupportContext struct {
	// contains filtered or unexported fields
}

func (*SupportContext) Support 

func (ctx *SupportContext) Support(n Vector) MinkowskiPoint

Calculate the maximal point on the minkowski difference of two shapes along a particular axis.

type SupportPoint 

type SupportPoint struct {
	// contains filtered or unexported fields
}

func CircleSupportPoint 

func CircleSupportPoint(shape *Shape, n Vector) *SupportPoint

func NewSupportPoint 

func NewSupportPoint(p Vector, index uint32) *SupportPoint

func PolySupportPoint 

func PolySupportPoint(shape *Shape, n Vector) *SupportPoint

func SegmentSupportPoint 

func SegmentSupportPoint(shape *Shape, n Vector) *SupportPoint

type SupportPointFunc 

type SupportPointFunc func(shape *Shape, n Vector) *SupportPoint

type Thread 

type Thread struct {
	// contains filtered or unexported fields
}
func (thread *Thread) Unlink()

type Transform 

type Transform struct {
	// contains filtered or unexported fields
}

func NewTransform 

func NewTransform(a, c, tx, b, d, ty float64) Transform

func NewTransformIdentity 

func NewTransformIdentity() Transform

func NewTransformRigid 

func NewTransformRigid(translate Vector, radians float64) Transform

func NewTransformRigidInverse 

func NewTransformRigidInverse(t Transform) Transform

func NewTransformRotate 

func NewTransformRotate(radians float64) Transform

func NewTransformScale 

func NewTransformScale(scaleX, scaleY float64) Transform

func NewTransformTranslate 

func NewTransformTranslate(translate Vector) Transform

func NewTransformTranspose 

func NewTransformTranspose(a, c, tx, b, d, ty float64) Transform

func (Transform) AxialScale 

func (outer Transform) AxialScale(axis, pivot Vector, scale float64) Transform

func (Transform) BB 

func (t Transform) BB(bb BB) BB

func (Transform) BoneScale 

func (outer Transform) BoneScale(v0, v1 Vector) Transform

func (Transform) Inverse 

func (t Transform) Inverse() Transform

func (Transform) Mult 

func (t Transform) Mult(t2 Transform) Transform

func (Transform) Ortho 

func (outer Transform) Ortho(bb BB) Transform

func (Transform) Point 

func (t Transform) Point(p Vector) Vector

func (Transform) Vect 

func (t Transform) Vect(v Vector) Vector

func (Transform) Wrap 

func (outer Transform) Wrap(inner Transform) Transform

type Vector 

type Vector struct {
	X, Y float64
}

func CentroidForPoly 

func CentroidForPoly(count int, verts []Vector) Vector

func ForAngle 

func ForAngle(a float64) Vector

/ Returns the unit length vector for the given angle (in radians).

func (Vector) Add 

func (v Vector) Add(other Vector) Vector

func (Vector) CheckAxis 

func (v0 Vector) CheckAxis(v1, p, n Vector) bool

func (Vector) Clamp 

func (v Vector) Clamp(length float64) Vector

func (Vector) Clone 

func (p Vector) Clone() Vector

func (Vector) ClosestDist 

func (v0 Vector) ClosestDist(v1 Vector) float64

func (Vector) ClosestPointOnSegment 

func (p Vector) ClosestPointOnSegment(a, b Vector) Vector

func (Vector) ClosestT 

func (a Vector) ClosestT(b Vector) float64

func (Vector) Cross 

func (v Vector) Cross(other Vector) float64

/ 2D vector cross product analog. / The cross product of 2D vectors results in a 3D vector with only a z component. / This function returns the magnitude of the z value.

func (Vector) Distance 

func (v Vector) Distance(other Vector) float64

func (Vector) DistanceSq 

func (v Vector) DistanceSq(other Vector) float64

func (Vector) Dot 

func (v Vector) Dot(other Vector) float64

func (Vector) Equal 

func (v Vector) Equal(other Vector) bool

func (Vector) Length 

func (v Vector) Length() float64

func (Vector) LengthSq 

func (v Vector) LengthSq() float64

func (Vector) Lerp 

func (v Vector) Lerp(other Vector, t float64) Vector

func (Vector) LerpConst 

func (v Vector) LerpConst(other Vector, d float64) Vector

func (Vector) LerpT 

func (a Vector) LerpT(b Vector, t float64) Vector

func (Vector) Mult 

func (v Vector) Mult(s float64) Vector

func (Vector) Near 

func (v Vector) Near(other Vector, d float64) bool

func (Vector) Neg 

func (v Vector) Neg() Vector

func (Vector) Normalize 

func (v Vector) Normalize() Vector

func (Vector) Perp 

func (v Vector) Perp() Vector

func (Vector) PointGreater 

func (a Vector) PointGreater(b, c Vector) bool

func (Vector) Project 

func (v Vector) Project(other Vector) Vector

func (Vector) ReversePerp 

func (v Vector) ReversePerp() Vector

func (Vector) Rotate 

func (v Vector) Rotate(other Vector) Vector

func (Vector) SLerp 

func (v Vector) SLerp(other Vector, t float64) Vector

func (Vector) SlerpConst 

func (v Vector) SlerpConst(other Vector, a float64) Vector

func (Vector) String 

func (v Vector) String() string

func (Vector) Sub 

func (v Vector) Sub(other Vector) Vector

func (Vector) ToAngle 

func (v Vector) ToAngle() float64

func (Vector) Unrotate 

func (v Vector) Unrotate(other Vector) Vector

Source Files

View all Source files

Directories

Path Synopsis
bench
bouncyhexagons
buoyancy
chains
contactgraph
convex
crane
joints
logosmash
oneway
planet
player
plink
pump
pyramidstack
pyramidtopple
query
shatter
slice
springies
sticky
tank
theojansen
tumble
unicycle

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