Source File
	ovg_edge.go

Belonging Package
	github.com/pancsta/d2/d2layouts/d2talalayout/internal/routing

package routing

import (
	"github.com/pancsta/d2/lib/geo"
)

type OVGEdge struct {
	From *OVGNode
	To   *OVGNode

	Distance float64
}

func NewOVGEdge(from, to *OVGNode) *OVGEdge {
	return &OVGEdge{
		From: from,
		To:   to,
	}
}

func (e *OVGEdge) isVertical() bool {
	return e.From.X == e.To.X
}

func (e *OVGEdge) isHorizontal() bool {
	return e.From.Y == e.To.Y
}

func (e *OVGEdge) sharePoints(other OVGEdge) bool {
	return (nonNilEquals(e.From.Point, other.From.Point) ||
		nonNilEquals(e.From.Point, other.To.Point) ||
		nonNilEquals(e.To.Point, other.From.Point) ||
		nonNilEquals(e.To.Point, other.To.Point))
}

// geo.Point.Equals skipping nil check
// TODO move to d2 as Equals, rename existing to NilEquals
func nonNilEquals(p1, p2 *geo.Point) bool {
	return p1.X == p2.X && p1.Y == p2.Y
}

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