}

const maxNodelets = 4 // Number of nodelets for labels (both numeric and non)

// ComposeDot creates and writes a in the DOT format to the writer, using
// the configurations given.
func ComposeDot(w io.Writer, g *Graph, a *DotAttributes, c *DotConfig) {
	builder := &builder{w, a, c}

	// Begin constructing DOT by adding a title and legend.
	builder.start()

	if rpt == nil {
		return // error already reported
	}

	// Generate dot graph.
	g, config := report.GetDOT(rpt)
	legend := config.Labels
	config.Labels = nil
	dot := &bytes.Buffer{}
	graph.ComposeDot(dot, g, &graph.DotAttributes{}, config)

	// Convert to svg.
	svg, err := dotToSvg(dot.Bytes())
	if err != nil {
		http.Error(w, "Could not execute dot; may need to install graphviz.",

		Total:       rpt.total,
	}
	return g, c
}

// printDOT prints an annotated callgraph in DOT format.
func printDOT(w io.Writer, rpt *Report) error {
	g, c := GetDOT(rpt)
	graph.ComposeDot(w, g, &graph.DotAttributes{}, c)
	return nil
}

// ProfileLabels returns printable labels for a profile.
func ProfileLabels(rpt *Report) []string {
	label := []string{}
	prof := rpt.prof