Function NewLabels

plotter/labels.go:44–72

NewLabels returns a new Labels using the DefaultFont and the DefaultFontSize.

(d XYLabeller)

// NewLabels returns a new Labels using the DefaultFont and
// the DefaultFontSize.
func NewLabels(d XYLabeller) (*Labels, error) {
	xys, err := CopyXYs(d)
	if err != nil {
		return nil, err
	}

	if d.Len() != len(xys) {
		return nil, errors.New("plotter: number of points does not match the number of labels")
	}

	strs := make([]string, d.Len())
	for i := range strs {
		strs[i] = d.Label(i)
	}

	styles := make([]text.Style, d.Len())
	for i := range styles {
		styles[i] = text.Style{
			Font:    font.From(DefaultFont, DefaultFontSize),
			Handler: plot.DefaultTextHandler,
		}
	}

	return &Labels{
		XYs:       xys,
		Labels:    strs,
		TextStyle: styles,
	}, nil
}

// Plot implements the Plotter interface, drawing labels.
func (l *Labels) Plot(c draw.Canvas, p *plot.Plot) {