112 lines
1.6 KiB
Go
112 lines
1.6 KiB
Go
package mx
|
|
|
|
import (
|
|
//"github.com/hajimehoshi/ebiten/v2"
|
|
"math"
|
|
)
|
|
|
|
var (
|
|
ZV = V2(0)
|
|
)
|
|
|
|
type Vector struct {
|
|
X, Y Float
|
|
|
|
}
|
|
type Vectors []Vector
|
|
|
|
func (v Vector) XY() (Float, Float) {
|
|
return v.X, v.Y
|
|
}
|
|
|
|
func V(x, y Float) Vector {
|
|
return Vector{x, y}
|
|
}
|
|
|
|
func V2(v Float) Vector {
|
|
return Vector{v, v}
|
|
}
|
|
|
|
func VX(x Float) Vector {
|
|
return Vector{x, 0}
|
|
}
|
|
|
|
func VY(y Float) Vector {
|
|
return Vector{0, y}
|
|
}
|
|
|
|
func (v Vector) Div(o Vector) Vector {
|
|
return V(
|
|
v.X / o.X,
|
|
v.Y / o.Y,
|
|
)
|
|
}
|
|
|
|
func (v Vector) Mul(o Vector) Vector {
|
|
return V(
|
|
v.X * o.X,
|
|
v.Y * o.Y,
|
|
)
|
|
}
|
|
|
|
func (v Vector) Eq(o Vector) bool {
|
|
return v.X == o.X && v.Y == o.Y
|
|
}
|
|
|
|
// Returns the vector with the matrix applied
|
|
func (v Vector) Apply(m Matrice) Vector {
|
|
x, y := m.Apply(v.X, v.Y)
|
|
return Vector{x, y}
|
|
}
|
|
|
|
// Adds the vector to other one returning the result.
|
|
func (v Vector) Add(a Vector) Vector {
|
|
v.X += a.X
|
|
v.Y += a.Y
|
|
|
|
return v
|
|
}
|
|
|
|
// Returns the subtraction of all the vectors from the current one.
|
|
func (v Vector) Sub(s Vector) Vector {
|
|
v.X -= s.X
|
|
v.Y -= s.Y
|
|
|
|
return v
|
|
}
|
|
|
|
// Returns the negative version of the vector.
|
|
func (v Vector) Neg() Vector {
|
|
return Vector{
|
|
-v.X,
|
|
-v.Y,
|
|
}
|
|
}
|
|
|
|
// Returns the vector rotated by "a" angle in radians.
|
|
func (v Vector) Rot(a Float) Vector {
|
|
m := Matrice{}
|
|
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)
|
|
}
|
|
|
|
func (pts Vectors) PointsContainedIn(
|
|
c PointContainer,
|
|
) Vectors {
|
|
ret := make(Vectors, 0, len(pts))
|
|
|
|
for _, pt := range pts {
|
|
if c.ContainsPoint(pt) {
|
|
ret = append(ret, pt)
|
|
}
|
|
}
|
|
|
|
return ret
|
|
}
|
|
|