mathUtil

func (Vector2) Norm ¶

func (v Vector2) Norm() float64

func (Vector2) VectorDegAngle ¶

func (v Vector2) VectorDegAngle() float64

VectorDegAngle 计算基于水平线的角度

func (Vector3) Abs ¶

func (v Vector3) Abs() Vector3

Abs returns the Vector3 with nonnegative components.

func (Vector3) Add ¶

func (v Vector3) Add(ov Vector3) Vector3

Add returns the standard Vector3 sum of v and ov.

func (Vector3) Angle ¶

func (v Vector3) Angle(ov Vector3) s1.Angle

Angle returns the angle between v and ov.

func (Vector3) ApproxEqual ¶

func (v Vector3) ApproxEqual(ov Vector3) bool

ApproxEqual reports whether v and ov are equal within a small epsilon.

func (*Vector3) Clone ¶

func (v *Vector3) Clone() Vector3

Clone 三维向量：拷贝

func (Vector3) Cmp ¶

func (v Vector3) Cmp(ov Vector3) int

Cmp compares v and ov lexicographically and returns:

-1 if v <  ov
 0 if v == ov
+1 if v >  ov

This method is based on C++'s std::lexicographical_compare. Two entities are compared element by element with the given operator. The first mismatch defines which is less (or greater) than the other. If both have equivalent values they are lexicographically equal.

func (Vector3) Cross ¶

func (v Vector3) Cross(ov Vector3) Vector3

Cross returns the standard cross product of v and ov.

func (Vector3) Distance ¶

func (v Vector3) Distance(ov Vector3) float64

Distance returns the Euclidean distance between v and ov.

func (Vector3) Dot ¶

func (v Vector3) Dot(ov Vector3) float64

Dot returns the standard dot product of v and ov.

func (Vector3) IsUnit ¶

func (v Vector3) IsUnit() bool

IsUnit returns whether this Vector3 is of approximately unit length.

func (Vector3) LargestComponent ¶

func (v Vector3) LargestComponent() Axis

LargestComponent returns the axis that represents the largest component in this Vector3.

func (Vector3) Mul ¶

func (v Vector3) Mul(m float64) Vector3

Mul returns the standard scalar product of v and m.

func (Vector3) Norm ¶

func (v Vector3) Norm() float64

Norm returns the Vector3's norm.

func (Vector3) Norm2 ¶

func (v Vector3) Norm2() float64

Norm2 returns the square of the norm.

func (Vector3) Normalize ¶

func (v Vector3) Normalize() Vector3

Normalize returns a unit Vector3 in the same direction as v.

func (Vector3) Ortho ¶

func (v Vector3) Ortho() Vector3

Ortho returns a unit Vector3 that is orthogonal to v. Ortho(-v) = -Ortho(v) for all v.

func (Vector3) SmallestComponent ¶

func (v Vector3) SmallestComponent() Axis

SmallestComponent returns the axis that represents the smallest component in this Vector3.

func (Vector3) String ¶

func (v Vector3) String() string

func (Vector3) Sub ¶

func (v Vector3) Sub(ov Vector3) Vector3

Sub returns the standard Vector3 difference of v and ov.