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// Copyright ©2014 The Gonum Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package simple
import (
"math"
"gonum.org/v1/gonum/graph"
)
// Node is a simple graph node.
type Node int64
// ID returns the ID number of the node.
func (n Node) ID() int64 {
return int64(n)
}
func newSimpleNode(id int) graph.Node {
return Node(id)
}
// Edge is a simple graph edge.
type Edge struct {
F, T graph.Node
}
// From returns the from-node of the edge.
func (e Edge) From() graph.Node { return e.F }
// To returns the to-node of the edge.
func (e Edge) To() graph.Node { return e.T }
// ReversedEdge returns a new Edge with the F and T fields
// swapped.
func (e Edge) ReversedEdge() graph.Edge { return Edge{F: e.T, T: e.F} }
// WeightedEdge is a simple weighted graph edge.
type WeightedEdge struct {
F, T graph.Node
W float64
}
// From returns the from-node of the edge.
func (e WeightedEdge) From() graph.Node { return e.F }
// To returns the to-node of the edge.
func (e WeightedEdge) To() graph.Node { return e.T }
// ReversedEdge returns a new Edge with the F and T fields
// swapped. The weight of the new Edge is the same as
// the weight of the receiver.
func (e WeightedEdge) ReversedEdge() graph.Edge { return WeightedEdge{F: e.T, T: e.F, W: e.W} }
// Weight returns the weight of the edge.
func (e WeightedEdge) Weight() float64 { return e.W }
// isSame returns whether two float64 values are the same where NaN values
// are equalable.
func isSame(a, b float64) bool {
return a == b || (math.IsNaN(a) && math.IsNaN(b))
}
type edgeSetter interface {
SetEdge(e graph.Edge)
}
type weightedEdgeSetter interface {
SetWeightedEdge(e graph.WeightedEdge)
}
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