cp

package module
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 Go to latest Published: Oct 11, 2024 License: MIT Imports: 5 Imported by: 66

README

cp

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Go port of Chipmunk2D physics library.

import "github.com/jakecoffman/cp/v2"

Project status

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

Examples

Documentation

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

Features

Same features as Chipmunk2D:

  • 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 (
	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 MAX_CONTACTS_PER_ARBITER = 2
View Source 
const (
	SHAPE_TYPE_NUM = 3
)

Variables

View Source 
var (
	NO_GROUP       uint = 0        // Value for group signifying that a shape is in no group.
	ALL_CATEGORIES uint = ^uint(0) // Value for Shape layers signifying that a shape is in every layer.
)
View Source 
var BuiltinCollisionFuncs = [9]CollisionFunc{
	CircleToCircle,
	CollisionError,
	CollisionError,
	CircleToSegment,
	SegmentToSegment,
	CollisionError,
	CircleToPoly,
	SegmentToPoly,
	PolyToPoly,
}
View Source 
var CollisionHandlerDefault = CollisionHandler{
	WILDCARD_COLLISION_TYPE,
	WILDCARD_COLLISION_TYPE,
	DefaultBegin,
	DefaultPreSolve,
	DefaultPostSolve,
	DefaultSeparate,
	nil,
}
View Source 
var CollisionHandlerDoNothing = CollisionHandler{
	WILDCARD_COLLISION_TYPE,
	WILDCARD_COLLISION_TYPE,
	AlwaysCollide,
	AlwaysCollide,
	DoNothing,
	DoNothing,
	nil,
}
View Source 
var SHAPE_FILTER_ALL = ShapeFilter{NO_GROUP, ALL_CATEGORIES, ALL_CATEGORIES}

SHAPE_FILTER_ALL is s collision filter value for a shape that will collide with anything except SHAPE_FILTER_NONE.

View Source 
var SHAPE_FILTER_NONE = ShapeFilter{NO_GROUP, ^ALL_CATEGORIES, ^ALL_CATEGORIES}

SHAPE_FILTER_NONE is a collision filter value for a shape that does not collide with anything.

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

AreaForCircle returns area of a hollow circle.

r1 and r2 are the inner and outer diameters. A solid circle has an inner diameter of 0.

func AreaForPoly 

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

AreaForPoly calculates the signed area of a polygon.

A Clockwise winding gives positive area. This is probably backwards from what you expect, but matches Chipmunk's the winding for poly shapes.

func AreaForSegment 

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

AreaForSegment calculates the area of a fattened (capsule shaped) line segment.

func BodyUpdatePosition 

func BodyUpdatePosition(body *Body, dt float64)

BodyUpdatePosition is default position integration function.

func BodyUpdateVelocity 

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

BodyUpdateVelocity is default velocity integration function.

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(info *CollisionInfo)

func CircleToPoly 

func CircleToPoly(info *CollisionInfo)

func CircleToSegment 

func CircleToSegment(info *CollisionInfo)

func Clamp 

func Clamp(f, min, max float64) float64

func Clamp01 

func Clamp01(f float64) float64

func CollisionError 

func CollisionError(_ *CollisionInfo)

func ComponentActive 

func ComponentActive(root *Body, threshold float64) bool

func ContactPoints 

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

ContactPoints finds contact point pairs on two support edges' 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

DebugInfo returns info of space

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 MarchCellHard 

func MarchCellHard(t, a, b, c, d, x0, x1, y0, y1 float64, marchSegment MarchSegmentFunc, segmentData *PolyLineSet)

func MarchCellSoft 

func MarchCellSoft(t, a, b, c, d, x0, x1, y0, y1 float64, marchSegment MarchSegmentFunc, segmentData *PolyLineSet)

func MomentForBox 

func MomentForBox(mass, width, height float64) float64

MomentForBox calculates the moment of inertia for a solid box.

func MomentForBox2 

func MomentForBox2(mass float64, box BB) float64

MomentForBox2 calculates the moment of inertia for a solid box.

func MomentForCircle 

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

MomentForCircle calculates the moment of inertia for a circle.

r1 and r2 are the inner and outer diameters. A solid circle has an inner diameter of 0.

func MomentForPoly 

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

MomentForPoly calculates the moment of inertia for a solid polygon shape assuming it's center of gravity is at it's centroid. The offset is added to each vertex.

func MomentForSegment 

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

MomentForSegment calculates the moment of inertia for a line segment.

Beveling radius is not supported.

func NearestPointQueryNearest 

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

func Next 

func Next(i, count int) int

func NodeSetA 

func NodeSetA(node, value *Node)

func NodeSetB 

func NodeSetB(node, value *Node)

func PolyLineCollectSegment 

func PolyLineCollectSegment(v0, v1 Vector, pls *PolyLineSet)

Add a segment to a polyline set. A segment will either start a new polyline, join two others, or add to or loop an existing polyline.

func PolySupportPointIndex 

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

func PolyToPoly 

func PolyToPoly(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(info *CollisionInfo)

func SegmentToSegment 

func SegmentToSegment(info *CollisionInfo)

func Sharpness 

func Sharpness(a, b, c Vector) float64

func SpaceArbiterSetFilter 

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

SpaceArbiterSetFilter throws 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
}

Arbiter struct tracks pairs of colliding shapes.

They are also used in conjuction with collision handler callbacks allowing you to retrieve information on the collision or change it. A unique arbiter value is used for each pair of colliding objects. It persists until the shapes separate.

func ArbiterNext 

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

Bodies returns the colliding bodies involved for this arbiter. The order of the space.CollisionType the bodies are associated with values will match the order set when the collision handler was registered.

func (*Arbiter) CallWildcardBeginA 

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

CallWildcardBeginA if you want a custom callback to invoke the wildcard callback for the first collision type, you must call this function explicitly.

You must decide how to handle the wildcard's return value since it may disagree with the other wildcard handler's return value or your own.

func (*Arbiter) CallWildcardBeginB 

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

CallWildcardBeginB If you want a custom callback to invoke the wildcard callback for the second collision type, you must call this function explicitly.

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

CallWildcardPreSolveA If you want a custom callback to invoke the wildcard callback for the first collision type, you must call this function explicitly.

func (*Arbiter) CallWildcardPreSolveB 

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

CallWildcardPreSolveB If you want a custom callback to invoke the wildcard callback for the second collision type, you must call this function explicitly.

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

ContactPointSet returns ContactPointSet

func (*Arbiter) Count 

func (arb *Arbiter) Count() int

func (*Arbiter) Ignore 

func (arb *Arbiter) Ignore() bool

Ignore marks a collision pair to be ignored until the two objects separate.

Pre-solve and post-solve callbacks will not be called, but the separate callback will be called.

func (*Arbiter) Init 

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

Init initializes and returns 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)

SetContactPointSet replaces the contact point set.

This can be a very powerful feature, but use it with caution!

func (*Arbiter) Shapes 

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

Shapes return the colliding shapes involved for this arbiter. The order of their space.CollisionType values will match the order set when the collision handler was registered.

func (*Arbiter) ThreadForBody 

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

func (*Arbiter) TotalImpulse 

func (arb *Arbiter) TotalImpulse() Vector

TotalImpulse calculates the total impulse including the friction that was applied by this arbiter.

This function should only be called from a post-solve, post-step or EachArbiter callback.

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
}

BB is Chipmunk's axis-aligned 2D bounding box type. (left, bottom, right, top)

func NewBB 

func NewBB(l, b, r, t float64) BB

NewBB is convenience constructor for BB structs.

func NewBBForCircle 

func NewBBForCircle(p Vector, r float64) BB

NewBBForCircle constructs a BB for a circle with the given position and radius.

func NewBBForExtents 

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

NewBBForExtents constructs a BB centered on a point with the given extents (half sizes).

func ShapeGetBB 

func ShapeGetBB(obj *Shape) BB

func (BB) Area 

func (bb BB) Area() float64

Area returns the area of the bounding box.

func (BB) Center 

func (bb BB) Center() Vector

Center returns the center of a bounding box.

func (BB) ClampVect 

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

ClampVect clamps a vector to bounding box.

func (BB) Contains 

func (bb BB) Contains(other BB) bool

Contains returns true if other lies completely within bb.

func (BB) ContainsVect 

func (bb BB) ContainsVect(v Vector) bool

ContainsVect returns true if bb contains v.

func (BB) Expand 

func (bb BB) Expand(v Vector) BB

Expand returns a bounding box that holds both bb and v.

func (BB) Intersects 

func (a BB) Intersects(b BB) bool

Intersects returns true if a and b intersect.

func (BB) IntersectsSegment 

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

IntersectsSegment returns true if the bounding box intersects the line segment with ends a and b.

func (BB) Merge 

func (a BB) Merge(b BB) BB

Merge returns a bounding box that holds both bounding boxes.

func (BB) MergedArea 

func (a BB) MergedArea(b BB) float64

MergedArea merges a and b and returns the area of the merged bounding box.

func (BB) Offset 

func (bb BB) Offset(v Vector) BB

Offset returns a bounding box offseted by v.

func (BB) Proximity 

func (a BB) Proximity(b BB) float64

func (BB) SegmentQuery 

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

SegmentQuery returns the fraction along the segment query the BB is hit. Returns cp.INFINITY if it doesn't hit.

func (BB) String 

func (bb BB) String() string

func (BB) WrapVect 

func (bb BB) WrapVect(v Vector) Vector

WrapVect wraps a vector to bounding box.

type BBQueryContext 

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

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) 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 is an object that this constraint is associated with.
	//
	// You can use this get a reference to your game object or controller object from within callbacks.
	UserData interface{}
	// contains filtered or unexported fields
}

func NewBody 

func NewBody(mass, moment float64) *Body

NewBody Initializes a rigid body with the given mass and moment of inertia.

Guessing the moment of inertia is usually a bad idea. Use the moment estimation functions MomentFor*().

func NewKinematicBody 

func NewKinematicBody() *Body

NewKinematicBody allocates and initializes a Body, and set it as a kinematic body.

func NewStaticBody 

func NewStaticBody() *Body

NewStaticBody allocates and initializes a Body, and set it as a static body.

func (*Body) AccumulateMassFromShapes 

func (body *Body) AccumulateMassFromShapes()

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

func (*Body) Activate 

func (body *Body) Activate()

Activate wakes up a sleeping or idle body.

func (*Body) ActivateStatic 

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

ActivateStatic wakes up any sleeping or idle bodies touching a static body.

func (*Body) AddShape 

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

AddShape adds shape to the body and returns added shape

func (*Body) Angle 

func (body *Body) Angle() float64

Angle returns the angle of the body.

func (*Body) AngularVelocity 

func (body *Body) AngularVelocity() float64

AngularVelocity returns the angular velocity of the body.

func (*Body) ApplyForceAtLocalPoint 

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

ApplyForceAtLocalPoint applies a force at local point.

func (*Body) ApplyForceAtWorldPoint 

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

ApplyForceAtWorldPoint applies a force at world point.

func (*Body) ApplyImpulseAtLocalPoint 

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

ApplyImpulseAtLocalPoint applies impulse at local point

func (*Body) ApplyImpulseAtWorldPoint 

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

ApplyImpulseAtWorldPoint applies impulse at world point

func (Body) CenterOfGravity 

func (body Body) CenterOfGravity() Vector

CenterOfGravity returns the offset of the center of gravity in body local coordinates.

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))

EachArbiter calls f once for each arbiter that is currently active on the body.

func (*Body) EachConstraint 

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

EachConstraint calls f once for each constraint attached to this body

func (*Body) EachShape 

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

EachShape calls f once for each shape attached to this body

func (*Body) Force 

func (body *Body) Force() Vector

Force returns the force applied to the body for the next time step.

func (*Body) GetType 

func (body *Body) GetType() int

GetType returns the type of the body.

func (*Body) IdleTime 

func (body *Body) IdleTime() float64

IdleTime returns sleeping idle time of the body

func (*Body) IsSleeping 

func (body *Body) IsSleeping() bool

IsSleeping returns true if the body is sleeping.

func (*Body) KineticEnergy 

func (body *Body) KineticEnergy() float64

KineticEnergy returns the kinetic energy of this body.

func (*Body) LocalToWorld 

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

LocalToWorld converts from body local to world coordinates.

Convert a point in world (absolute) coordinates to body local coordinates affected by the position and rotation of the rigid body.

func (*Body) Mass 

func (body *Body) Mass() float64

Mass returns mass of the body

func (Body) Moment 

func (body Body) Moment() float64

Moment returns moment of inertia of the body.

func (*Body) Position 

func (body *Body) Position() Vector

Position returns the position of the body.

func (*Body) PushArbiter 

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

func (*Body) RemoveConstraint 

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

RemoveConstraint removes constraint from the body.

func (*Body) RemoveShape 

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

RemoveShape removes collision shape from the body.

func (*Body) Rotation 

func (body *Body) Rotation() Vector

Rotation returns the rotation vector of the body.

(The x basis vector of it's transform.)

func (*Body) SetAngle 

func (body *Body) SetAngle(angle float64)

SetAngle sets the angle of body.

func (*Body) SetAngularVelocity 

func (body *Body) SetAngularVelocity(angularVelocity float64)

SetAngularVelocity sets the angular velocity of the body.

func (*Body) SetForce 

func (body *Body) SetForce(force Vector)

SetForce sets the force applied to the body for the next time step.

func (*Body) SetMass 

func (body *Body) SetMass(mass float64)

SetMass sets mass of the body

func (*Body) SetMoment 

func (body *Body) SetMoment(moment float64)

SetMoment sets moment of inertia of the body.

func (*Body) SetPosition 

func (body *Body) SetPosition(position Vector)

SetPosition sets the position of the body.

func (*Body) SetPositionUpdateFunc 

func (body *Body) SetPositionUpdateFunc(f BodyPositionFunc)

SetPositionUpdateFunc sets the callback used to update a body's position.

func (*Body) SetTorque 

func (body *Body) SetTorque(torque float64)

SetTorque sets the torque applied to the body for the next time step.

func (*Body) SetTransform 

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

SetTransform sets transform

func (*Body) SetType 

func (body *Body) SetType(newType int)

SetType sets the type of the body.

func (*Body) SetVelocity 

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

SetVelocity sets the velocity of the body.

Shorthand for Body.SetVelocityVector()

func (*Body) SetVelocityUpdateFunc 

func (body *Body) SetVelocityUpdateFunc(f BodyVelocityFunc)

SetVelocityUpdateFunc sets the callback used to update a body's velocity.

func (*Body) SetVelocityVector 

func (body *Body) SetVelocityVector(v Vector)

SetVelocityVector sets the velocity of the body

func (Body) String 

func (b Body) String() string

String returns body id as string

func (*Body) Torque 

func (body *Body) Torque() float64

Torque returns the torque applied to the body for the next time step.

func (*Body) UpdateVelocity 

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

UpdateVelocity is the default velocity integration function.

func (*Body) Velocity 

func (body *Body) Velocity() Vector

Velocity returns the velocity of the body.

func (*Body) VelocityAtLocalPoint 

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

VelocityAtLocalPoint returns the velocity of a point on a body.

Get the world (absolute) velocity of a point on a rigid body specified in body local coordinates.

func (*Body) VelocityAtWorldPoint 

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

VelocityAtWorldPoint returns the velocity of a point on a body.

Get the world (absolute) velocity of a point on a rigid body specified in world coordinates.

func (*Body) WorldToLocal 

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

WorldToLocal converts from world to body local Coordinates.

Convert a point in body local coordinates to world (absolute) coordinates.

type BodyPositionFunc 

type BodyPositionFunc func(body *Body, dt float64)

BodyPositionFunc is rigid body position update function type.

type BodyVelocityFunc 

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

BodyVelocityFunc is 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) 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, v1, v2 MinkowskiPoint) ClosestPoints

EPA is called from GJK when two shapes overlap. Finds the closest points on the surface of two overlapping shapes using the EPA algorithm. 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

EPARecurse 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

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

func GJKRecurse 

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

GJKRecurse implementation of the GJK loop.

type CollisionBeginFunc 

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

CollisionBeginFunc is collision begin event function callback type.

Returning false from a begin callback causes the collision to be ignored until the the separate callback is called when the objects stop colliding.

type CollisionFunc 

type CollisionFunc func(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{}
}

CollisionHandler is 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.

type CollisionInfo 

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

CollisionInfo collision info struct

func Collide 

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

Collide performs a collision between two shapes

func (*CollisionInfo) PushContact 

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

type CollisionPostSolveFunc 

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

CollisionPostSolveFunc is collision post-solve event function callback type.

type CollisionPreSolveFunc 

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

CollisionPreSolveFunc is collision pre-solve event function callback type.

Returning false from a pre-step callback causes the collision to be ignored until the next step.

type CollisionSeparateFunc 

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

CollisionSeparateFunc is collision separate event function callback type.

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

	UserData interface{}
	// 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 is the number of contact points in the set.
	Count int
	// Normal is the normal of the collision.
	Normal Vector

	Points [MAX_CONTACTS_PER_ARBITER]struct {
		// The position of the contact on the surface of each shape.
		PointA, PointB Vector
		// Distance is penetration distance of the two shapes. Overlapping means it will be negative.
		//
		// This value is calculated as p2.Sub(p1).Dot(n) and is ignored by Arbiter.SetContactPointSet().
		Distance float64
	}
}

ContactPointSet wraps up the important collision data for an arbiter.

func ShapesCollide 

func ShapesCollide(a, b *Shape) ContactPointSet

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[T, U comparable] struct {
	// contains filtered or unexported fields
}

HashSet implements a hash set

func NewHashSet 

func NewHashSet[T, U comparable](isEqual func(ptr T, elt U) bool) *HashSet[T, U]

NewHashSet is a HashSet constructor

func (*HashSet[T, U]) Count 

func (set *HashSet[T, U]) Count() uint

Count returns the number of entries

func (*HashSet[T, U]) Each 

func (set *HashSet[T, U]) Each(f func(U))

Each calls f for every U in the HashSet.

func (*HashSet[T, U]) Filter 

func (set *HashSet[T, U]) Filter(f func(U) bool)

Filter removes elements if f returns false

func (*HashSet[T, U]) Find 

func (set *HashSet[T, U]) Find(hash HashValue, ptr T) U

Find returns the U the T is in, or nil.

func (*HashSet[T, U]) Insert 

func (set *HashSet[T, U]) Insert(hash HashValue, ptr T, transform func(obj T) U) U

Insert returns the U the T is in, or inserts a new U and returns it.

func (*HashSet[T, U]) Remove 

func (set *HashSet[T, U]) Remove(hash HashValue, ptr T) U

Remove removes the T from the HashSet, returning the U it was in.

type HashSetBin 

type HashSetBin[U comparable] struct {
	// contains filtered or unexported fields
}

HashSetBin implements a linked list

type HashValue 

type HashValue uintptr

func HashPair 

func HashPair(a, b HashValue) HashValue

type Leaf 

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

type MarchCellFunc 

type MarchCellFunc func(t, a, b, c, d, x0, x1, y0, y1 float64, marchSegment MarchSegmentFunc, segmentData *PolyLineSet)

type MarchSampleFunc 

type MarchSampleFunc func(point Vector) float64

This is a user defined function that gets passed every single point from the bounding box the user passes into the March process - you can use this to sample an image and check for alpha values or really any 2d matrix you define like a tile map. NOTE: I could not determine a use case for the sample_data pointer from the original code so I removed it here - open to adding it back in if there is a reason.

type MarchSegmentFunc 

type MarchSegmentFunc func(v0 Vector, v1 Vector, segmentData *PolyLineSet)

This is a user defined function that gets passed in to the Marching process the user establishes a PolyLineSet, passes a pointer to their function, and they populate it. In most cases you want to use PolyLineCollectSegment instead of defining your own

type MarkContext 

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

type Mat2x2 

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

Mat2x2 is a 2x2 matrix type used for tensors and such.

func (*Mat2x2) Transform 

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

Transform transforms Vector v

type MinkowskiPoint 

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

MinkowskiPoint is a point on the surface of two shapes' minkowski difference.

func NewMinkowskiPoint 

func NewMinkowskiPoint(a, b SupportPoint) MinkowskiPoint

func (MinkowskiPoint) ClosestPoints 

func (v0 MinkowskiPoint) ClosestPoints(v1 MinkowskiPoint) ClosestPoints

ClosestPoints calculates 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
}

PointQueryInfo is point query info struct.

type PolyLine 

type PolyLine struct {
	Verts []Vector
}

func DouglasPeucker 

func DouglasPeucker(verts []Vector, reduced *PolyLine, length, start, end int, min, tol float64) *PolyLine

Recursive function used by cpPolylineSimplifyCurves().

func (*PolyLine) Enqueue 

func (pl *PolyLine) Enqueue(v Vector) *PolyLine

func (*PolyLine) IsClosed 

func (pl *PolyLine) IsClosed() bool

func (*PolyLine) IsShort 

func (pl *PolyLine) IsShort(count, start, end int, min float64) bool

func (*PolyLine) Push 

func (pl *PolyLine) Push(v Vector) *PolyLine

func (*PolyLine) SimplifyCurves 

func (pl *PolyLine) SimplifyCurves(tol float64) *PolyLine

Recursively reduce the vertex count on a polyline. Works best for smooth shapes. 'tol' is the maximum error for the reduction. The reduced polyline will never be farther than this distance from the original polyline.

func (*PolyLine) SimplifyVertexes 

func (pl *PolyLine) SimplifyVertexes(tol float64) *PolyLine

Join similar adjacent line segments together. Works well for hard edged shapes. 'tol' is the minimum anglular difference in radians of a vertex.

type PolyLineSet 

type PolyLineSet struct {
	Lines []*PolyLine
}

func MarchCells 

func MarchCells(bb BB, xSamples int64, ySamples int64, t float64, marchSegment MarchSegmentFunc, marchSample MarchSampleFunc, marchCell MarchCellFunc) *PolyLineSet

The looping and sample caching code is shared between cpMarchHard() and cpMarchSoft().

func MarchHard 

func MarchHard(bb BB, xSamples, ySamples int64, t float64, marchSegment MarchSegmentFunc, marchSample MarchSampleFunc) *PolyLineSet

Trace an aliased curve of an image along a particular threshold. The given number of samples will be taken and spread across the bounding box area using the sampling function and context. The segment function will be called for each segment detected that lies along the density contour for @c threshold.

func MarchSoft 

func MarchSoft(bb BB, xSamples, ySamples int64, t float64, marchSegment MarchSegmentFunc, marchSample MarchSampleFunc) *PolyLineSet

Trace an anti-aliased contour of an image along a particular threshold. The given number of samples will be taken and spread across the bounding box area using the sampling function and context. The segment function will be called for each segment detected that lies along the density contour for @c threshold.

func (*PolyLineSet) FindEnds 

func (pls *PolyLineSet) FindEnds(v Vector) int

Find the polyline that ends with v.

func (*PolyLineSet) FindStarts 

func (pls *PolyLineSet) FindStarts(v Vector) int

Find the polyline that starts with v.

func (*PolyLineSet) Join 

func (pls *PolyLineSet) Join(before, after int)

this may deletion could be slow? https://yourbasic.org/golang/delete-element-slice/

func (*PolyLineSet) Push 

func (pls *PolyLineSet) Push(v *PolyLine)

Add a new polyline to a polyline set.

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) 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) 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
}

SegmentQueryInfo is segment query info struct.

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) Area 

func (s *Shape) Area() float64

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) CenterOfGravity 

func (s *Shape) CenterOfGravity() Vector

func (*Shape) Density 

func (s *Shape) Density() float64

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) Mass 

func (s *Shape) Mass() float64

func (*Shape) MassInfo 

func (s *Shape) MassInfo() *ShapeMassInfo

func (*Shape) Moment 

func (s *Shape) Moment() float64

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) SetDensity 

func (s *Shape) SetDensity(density float64)

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) SetMass 

func (s *Shape) SetMass(mass float64)

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
	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
}

ShapeFilter is fast collision filtering type that is used to determine if two objects collide before calling collision or query callbacks.

func NewShapeFilter 

func NewShapeFilter(group, categories, mask uint) ShapeFilter

NewShapeFilter creates a new collision filter.

func (ShapeFilter) Reject 

func (a ShapeFilter) Reject(b ShapeFilter) bool

type ShapeMassInfo 

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

ShapeMassInfo is mass info struct

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 ShapePair 

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

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

	IdleSpeedThreshold float64
	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) BBQuery 

func (space *Space) BBQuery(bb BB, filter ShapeFilter, f SpaceBBQueryFunc, data interface{})

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) ReindexShape added in v2.1.0 

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

ReindexShape re-computes the hash of the shape in both the dynamic and static list.

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) ShapeQuery 

func (space *Space) ShapeQuery(shape *Shape, callback func(shape *Shape, points *ContactPointSet)) bool

ShapeQuery queries a space for any shapes overlapping the given shape and call the callback for each shape found.

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 SpaceBBQueryFunc 

type SpaceBBQueryFunc func(shape *Shape, data interface{})

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) 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 {
	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{})
}

SpatialIndexer 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

Support calculates 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, _ 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 (t Transform) AxialScale(axis, pivot Vector, scale float64) Transform

func (Transform) BB 

func (t Transform) BB(bb BB) BB

func (Transform) BoneScale 

func (t 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 (t 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 (t Transform) Wrap(inner Transform) Transform

type Vector 

type Vector struct {
	X, Y float64
}

func CentroidForPoly 

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

CentroidForPoly calculates the natural centroid of a polygon.

func ForAngle 

func ForAngle(a float64) Vector

ForAngle 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 (v Vector) CheckAxis(v1, p, n Vector) bool

func (Vector) Clamp 

func (v Vector) Clamp(length float64) Vector

func (Vector) Clone 

func (v Vector) Clone() Vector

func (Vector) ClosestDist 

func (v Vector) ClosestDist(v1 Vector) float64

func (Vector) ClosestPointOnSegment 

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

func (Vector) ClosestT 

func (v Vector) ClosestT(b Vector) float64

func (Vector) Cross 

func (v Vector) Cross(other Vector) float64

Cross calculates the 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 (v 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 (v 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

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