From 0525bc463f53487a7de8409697fabec28471a0bd Mon Sep 17 00:00:00 2001
From: emile <hanemile@protonmail.com>
Date: Mon, 15 Oct 2018 16:07:22 +0200
Subject: for detailed information about the changes, see
 https://git.darknebu.la/GalaxySimulator/Source/pulls/1

---
 structs/vector2D.go | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 structs/vector2D.go

(limited to 'structs/vector2D.go')

diff --git a/structs/vector2D.go b/structs/vector2D.go
new file mode 100644
index 0000000..47e457f
--- /dev/null
+++ b/structs/vector2D.go
@@ -0,0 +1,63 @@
+package structs
+
+import (
+	"math"
+)
+
+type Vec2 struct {
+	X, Y float64
+}
+
+// creates a copy of the vector
+func (v *Vec2) Copy() Vec2 {
+	return Vec2{v.X, v.Y}
+}
+
+func (v *Vec2) Split() (x float64, y float64) {
+	return v.X, v.Y
+}
+
+// changes the length of the vector to the length l
+func (v *Vec2) SetLength(l float64) {
+	var k = l / v.GetLength()
+	var newV = v.Multiply(k)
+	//	v = newV
+	v.X, v.Y = newV.Split()
+}
+
+// changes the length of the vector to the length 1
+func (v *Vec2) SetLengthOne() {
+	v.SetLength(1)
+}
+
+// returns the direction Vector of this vector. This means a copy of this vector with a length of 1
+func (v *Vec2) GetDirVector() Vec2 {
+	var dirV = v.Copy()
+	dirV.SetLengthOne()
+	return dirV
+}
+
+// returns the length of the vector
+func (v *Vec2) GetLength() float64 {
+	return math.Sqrt(math.Pow(v.X, 2) + math.Pow(v.Y, 2))
+}
+
+// returns the product of the vector and a scalar s
+func (v *Vec2) Multiply(s float64) Vec2 {
+	return Vec2{v.X * s, v.Y * s}
+}
+
+// returns the quotient of the vector and a scalar s
+func (v *Vec2) Divide(s float64) Vec2 {
+	return Vec2{v.X / s, v.Y / s}
+}
+
+// returns the sum of this vector and the vector v2
+func (v1 *Vec2) Add(v2 Vec2) Vec2 {
+	return Vec2{v1.X + v2.X, v1.Y + v2.Y}
+}
+
+// returns the difference of this vector minus the vector v2
+func (v1 *Vec2) Subtract(v2 Vec2) Vec2 {
+	return Vec2{v1.X - v2.X, v1.Y - v2.Y}
+}
-- 
cgit 1.4.1