Method addNodelets

internal/graph/dotgraph.go:216–263

addNodelets generates the DOT boxes for the node tags if they exist.

(node *Node, nodeID int)

// addNodelets generates the DOT boxes for the node tags if they exist.
func (b *builder) addNodelets(node *Node, nodeID int) bool {
	var nodelets string

	// Populate two Tag slices, one for LabelTags and one for NumericTags.
	var ts []*Tag
	lnts := make(map[string][]*Tag)
	for _, t := range node.LabelTags {
		ts = append(ts, t)
	}
	for l, tm := range node.NumericTags {
		for _, t := range tm {
			lnts[l] = append(lnts[l], t)
		}
	}

	// For leaf nodes, print cumulative tags (includes weight from
	// children that have been deleted).
	// For internal nodes, print only flat tags.
	flatTags := len(node.Out) > 0

	// Select the top maxNodelets alphanumeric labels by weight.
	SortTags(ts, flatTags)
	if len(ts) > maxNodelets {
		ts = ts[:maxNodelets]
	}
	for i, t := range ts {
		w := t.CumValue()
		if flatTags {
			w = t.FlatValue()
		}
		if w == 0 {
			continue
		}
		weight := b.config.FormatValue(w)
		nodelets += fmt.Sprintf(`N%d_%d [label = "%s" id="N%d_%d" fontsize=8 shape=box3d tooltip="%s"]`+"\n", nodeID, i, t.Name, nodeID, i, weight)
		nodelets += fmt.Sprintf(`N%d -> N%d_%d [label=" %s" weight=100 tooltip="%s" labeltooltip="%s"]`+"\n", nodeID, nodeID, i, weight, weight, weight)
		if nts := lnts[t.Name]; nts != nil {
			nodelets += b.numericNodelets(nts, maxNodelets, flatTags, fmt.Sprintf(`N%d_%d`, nodeID, i))
		}
	}

	if nts := lnts[""]; nts != nil {
		nodelets += b.numericNodelets(nts, maxNodelets, flatTags, fmt.Sprintf(`N%d`, nodeID))
	}

	fmt.Fprint(b, nodelets)
	return nodelets != ""
}

func (b *builder) numericNodelets(nts []*Tag, maxNumNodelets int, flatTags bool, source string) string {
	nodelets := ""