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graphviz.go
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graphviz.go
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package itree
import (
"fmt"
"strconv"
"github.com/goccy/go-graphviz"
"github.com/goccy/go-graphviz/cgraph"
)
var g = graphviz.New()
// GraphvizOptions allows configuring the graphviz output
type GraphvizOptions struct {
ShowAllNodes bool
stringValue func(int64) string
}
// Graphviz generates a graphviz representation of the tree
func (t Tree) Graphviz(opt GraphvizOptions) (*cgraph.Graph, error) {
graph, err := g.Graph()
if err != nil {
return nil, err
}
if opt.stringValue == nil {
opt.stringValue = func(v int64) string {
return strconv.Itoa(int(v))
}
}
_, err = createGraphvizNode(graph, opt, t.root)
if err != nil {
return nil, err
}
return graph, nil
}
func createGraphvizNode(graph *cgraph.Graph, opt GraphvizOptions, in *intervalTreeNode) (*cgraph.Node, error) {
n, err := graph.CreateNode(fmt.Sprintf("%s - %s", opt.stringValue(in.Start), opt.stringValue(in.End)))
if err != nil {
return nil, err
}
if in.visited {
n.SetFontColor("red")
}
if opt.ShowAllNodes || in.visited {
if in.left != nil {
l, err := createGraphvizNode(graph, opt, in.left)
if err != nil {
return nil, err
}
_, err = graph.CreateEdge("links", n, l)
if err != nil {
return nil, err
}
}
if in.right != nil {
r, err := createGraphvizNode(graph, opt, in.right)
if err != nil {
return nil, err
}
_, err = graph.CreateEdge("links", n, r)
if err != nil {
return nil, err
}
}
}
return n, nil
}