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Add matrix.Geometry.Scale

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This commit is contained in:
Hajime Hoshi 2013-10-11 21:30:04 +09:00
parent 8004bd802e
commit 81faffa76a
1 changed files with 9 additions and 0 deletions
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9
graphics/matrix/geometry.go
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@ -66,6 +66,15 @@ func (matrix *Geometry) Translate(tx, ty float64) {
matrix.Elements[1][2] += ty matrix.Elements[1][2] += ty
} }
func (matrix *Geometry) Scale(x, y float64) {
matrix.Elements[0][0] = x * matrix.Elements[0][0]
matrix.Elements[0][1] = x * matrix.Elements[0][1]
matrix.Elements[0][2] = x * matrix.Elements[0][2]
matrix.Elements[1][0] = y * matrix.Elements[1][0]
matrix.Elements[1][1] = y * matrix.Elements[1][1]
matrix.Elements[1][2] = y * matrix.Elements[1][2]
}
func (matrix *Geometry) Rotate(theta float64) { func (matrix *Geometry) Rotate(theta float64) {
sin, cos := math.Sincos(theta) sin, cos := math.Sincos(theta)
rotate := Geometry{ rotate := Geometry{