Move vector into maths package

pkg/maths/vector.go

@@ -0,0 +1,83 @@
+package maths
+
+import (
+	"math"
+)
+
+// Vector desribes a 3D vector
+type Vector struct {
+	X int `json:"x"`
+	Y int `json:"y"`
+}
+
+// Add adds one vector to another
+func (v *Vector) Add(v2 Vector) {
+	v.X += v2.X
+	v.Y += v2.Y
+}
+
+// Added calculates a new vector
+func (v Vector) Added(v2 Vector) Vector {
+	v.Add(v2)
+	return v
+}
+
+// Negated returns a negated vector
+func (v Vector) Negated() Vector {
+	return Vector{-v.X, -v.Y}
+}
+
+// Length returns the length of the vector
+func (v Vector) Length() float64 {
+	return math.Sqrt(float64(v.X*v.X + v.Y*v.Y))
+}
+
+// Distance returns the distance between two vectors
+func (v Vector) Distance(v2 Vector) float64 {
+	// Negate the two vectors and calciate the length
+	return v.Added(v2.Negated()).Length()
+}
+
+// Multiplied returns the vector multiplied by an int
+func (v Vector) Multiplied(val int) Vector {
+	return Vector{v.X * val, v.Y * val}
+}
+
+// Divided returns the vector divided by an int
+func (v Vector) Divided(val int) Vector {
+	return Vector{v.X / val, v.Y / val}
+}
+
+// DividedFloor returns the vector divided but floors the value regardless
+func (v Vector) DividedFloor(val int) Vector {
+	x := float64(v.X) / float64(val)
+
+	if x < 0 {
+		x = math.Floor(x)
+	} else {
+		x = math.Floor(x)
+	}
+	y := float64(v.Y) / float64(val)
+	if y < 0 {
+		y = math.Floor(y)
+	} else {
+		y = math.Floor(y)
+	}
+
+	return Vector{X: int(x), Y: int(y)}
+}
+
+// Abs returns an absolute version of the vector
+func (v Vector) Abs() Vector {
+	return Vector{Abs(v.X), Abs(v.Y)}
+}
+
+// Min2 returns the minimum values in both vectors
+func Min2(v1 Vector, v2 Vector) Vector {
+	return Vector{Min(v1.X, v2.X), Min(v1.Y, v2.Y)}
+}
+
+// Max2 returns the max values in both vectors
+func Max2(v1 Vector, v2 Vector) Vector {
+	return Vector{Max(v1.X, v2.X), Max(v1.Y, v2.Y)}
+}