From b0f81a6c7ddef342a152635451aa49bab9c48c2f Mon Sep 17 00:00:00 2001
From: faiface <faiface@ksp.sk>
Date: Sun, 20 Nov 2016 19:21:20 +0100
Subject: [PATCH] slightly optimize Vec.Rotated
---
vec.go | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/vec.go b/vec.go
index b934b42..eaae3eb 100644
--- a/vec.go
+++ b/vec.go
@@ -27,7 +27,7 @@ import (
// u := pixel.V(2, 3)
// v := pixel.V(8, 1)
// if u.X() < 0 {
-// fmt.Println("this won't happend")
+// fmt.Println("this won't happen")
// }
// x := u.Unit().Dot(v.Unit())
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.
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.
--
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