68 lines
1.3 KiB
Go
68 lines
1.3 KiB
Go
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package vector
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import (
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"math"
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"github.com/dhconnelly/rtreego"
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)
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type Vector3 struct {
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X, Y, Z float64
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}
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func (v *Vector3) SetOn(z, x, y float64) *Vector3 {
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v.Z = z
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v.X = x
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v.Y = y
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return v
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}
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func (v *Vector3) Copy() *Vector3 {
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return &Vector3{v.X, v.Y, v.Z}
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}
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func (v *Vector3) Subtract(other *Vector3) *Vector3 {
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return &Vector3{
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X: v.X - other.X,
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Y: v.Y - other.Y,
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Z: v.Z - other.Z,
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}
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}
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func (v *Vector3) Length() float64 {
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return math.Sqrt(v.X*v.X + v.Y*v.Y + v.Z*v.Z)
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}
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func (v *Vector3) RerpVectors(v1, v2 *Vector3, ratio float64) {
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v.X = v1.X + ratio*(v2.X-v1.X)
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v.Y = v1.Y + ratio*(v2.Y-v1.Y)
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v.Z = v1.Z + ratio*(v2.Z-v1.Z)
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}
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func (v *Vector3) AngleTo(other *Vector3) float64 {
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cosAlpha := (v.X*other.X + v.Y*other.Y + v.Z*other.Z) / (v.Length() * other.Length())
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return math.Acos(cosAlpha)
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}
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// Implementing rtreego.Spatial interface for Vector3
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func (v *Vector3) Bounds() *rtreego.Rect {
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point := rtreego.Point{v.X, v.Y}
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rect, _ := rtreego.NewRect(point, []float64{0.001, 0.001})
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return rect
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}
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func (v *Vector3) Scale(factor float64) *Vector3 {
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return &Vector3{
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X: v.X * factor,
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Y: v.Y * factor,
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Z: v.Z * factor,
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}
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}
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func (v *Vector3) Add(other *Vector3) *Vector3 {
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return &Vector3{
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X: v.X + other.X,
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Y: v.Y + other.Y,
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Z: v.Z + other.Z,
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}
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}
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