Refactor into packages

1 files changed, 30 insertions, 0 deletions

diff --git a/physics/geometry.go b/physics/geometry.go
new file mode 100644
index 0000000..1902fdf
--- /dev/null
+++ b/physics/geometry.go
@@ -0,0 +1,30 @@
+package physics
+
+import (
+	"image"
+	"math"
+)
+
+type Point = image.Point
+type Rectangle = image.Rectangle
+
+func Distance(p1, p2 Point) float64 {
+	return math.Sqrt(math.Pow(float64(p1.X-p2.X), 2) + math.Pow(float64(p1.Y-p2.Y), 2))
+}
+
+func Length(p Point) float64 {
+	return Distance(p, Point{X:0,Y:0})
+}
+
+func Normalize(p Point) Point {
+	return p.Div(int(Length(p)))
+}
+
+func AdjacentPoints(from Point) []Point {
+	return []Point{
+		from.Add(Point{X: 0, Y: -100}),
+		from.Add(Point{X: 0, Y: 100}),
+		from.Add(Point{X: -100, Y: 0}),
+		from.Add(Point{X: 100, Y: 0}),
+	}
+}