package geom

import "math"

const EPS = 1e-6

type Vec struct {
	X, Y float64
}

type Seg struct {
	A, B Vec
}

func V(x, y float64) Vec        { return Vec{x, y} }
func Sub(a, b Vec) Vec          { return Vec{a.X - b.X, a.Y - b.Y} }
func Dot(a, b Vec) float64      { return a.X*b.X + a.Y*b.Y }
func Cross(a, b Vec) float64    { return a.X*b.Y - a.Y*b.X }
func Len(a Vec) float64         { return math.Hypot(a.X, a.Y) }
func NearlyZero(x float64) bool { return math.Abs(x) < EPS }