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slightly optimize Vec.Rotated

This commit is contained in:
faiface 2016-11-20 19:21:20 +01:00
parent 86f0b0f8ca
commit b0f81a6c7d
1 changed files with 3 additions and 2 deletions
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5
vec.go
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@ -27,7 +27,7 @@ import (
// u := pixel.V(2, 3) // u := pixel.V(2, 3)
// v := pixel.V(8, 1) // v := pixel.V(8, 1)
// if u.X() < 0 { // if u.X() < 0 {
// fmt.Println("this won't happend") // fmt.Println("this won't happen")
// } // }
// x := u.Unit().Dot(v.Unit()) // x := u.Unit().Dot(v.Unit())
type Vec complex128 type Vec complex128
@ -78,7 +78,8 @@ func (u Vec) Scaled(c float64) Vec {
// Rotated returns a vector u rotated by the given angle in radians. // Rotated returns a vector u rotated by the given angle in radians.
func (u Vec) Rotated(angle float64) Vec { func (u Vec) Rotated(angle float64) Vec {
return u * V(math.Cos(angle), math.Sin(angle)) sin, cos := math.Sincos(angle)
return u * V(cos, sin)
} }
// Dot returns the dot product of vectors u and v. // Dot returns the dot product of vectors u and v.