gg/src/gx/vector.go

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package gx
import (
//"github.com/hajimehoshi/ebiten/v2"
"math"
)
type Vector struct {
X, Y Float
}
func V(x, y Float) Vector {
return Vector{x, y}
}
// Returns the vector with the matrix applied
func (v Vector) Apply(m *Matrix) Vector {
x, y := m.Apply(v.X, v.Y)
return V(x, y)
}
// Returns the vector rotated by "a" angle in radians.
func (v Vector) Rotate(a Float) Vector {
m := &Matrix{}
m.Rotate(a)
return v.Apply(m)
}
// Returns the normalized vector.
func (v Vector) Norm() Vector {
l := math.Sqrt(v.X*v.X + v.Y*v.Y)
return V(v.X / l, v.Y / l)
}