package main

type Point struct {
	X float64
	Y float64
}

type Line struct {
	P0 Point
	P1 Point
}

type QuadBez struct {
	P0 Point
	P1 Point
	P2 Point
}

type PathSegmentKind int

const (
	LineKind PathSegmentKind = iota + 1
	QuadKind
)

type PathSegment struct {
	Kind PathSegmentKind
	P0   Point
	P1   Point
	P2   Point
	P3   Point
}

func AsPathSegment[T Line | QuadBez](seg T) PathSegment {
	switch seg := any(seg).(type) {
	case Line:
		return PathSegment{Kind: LineKind, P0: seg.P0, P1: seg.P1}
	case QuadBez:
		return PathSegment{Kind: QuadKind, P0: seg.P0, P1: seg.P1, P2: seg.P2}
	default:
		panic("unreachable")
	}
}

var Sink PathSegment

func main() {
	Sink = AsPathSegment(Line{Point{2, 3}, Point{4, 5}})
}