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Use math.Sincos

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Hajime Hoshi 2013-06-24 00:14:39 +09:00
parent 8860d315ca
commit 784a67aadf
1 changed files with 1 additions and 2 deletions
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3
graphics/matrix/geometry.go
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@ -47,8 +47,7 @@ func (matrix *Geometry) Translate(tx, ty float64) {
} }
func (matrix *Geometry) Rotate(theta float64) { func (matrix *Geometry) Rotate(theta float64) {
cos := math.Cos(theta) sin, cos := math.Sincos(theta)
sin := math.Sin(theta)
rotate := Geometry{ rotate := Geometry{
[2][3]float64{ [2][3]float64{
{cos, -sin, 0}, {cos, -sin, 0},