func (pcs PercentChangeSeries) GetYAxis() YAxisType {
	return pcs.YAxis
}
GetYAxis returns which YAxis the series draws on.
package chart
var (
	_ Series                 = (*PercentChangeSeries)(nil)
	_ FirstValuesProvider    = (*PercentChangeSeries)(nil)
	_ LastValuesProvider     = (*PercentChangeSeries)(nil)
	_ ValueFormatterProvider = (*PercentChangeSeries)(nil)
)
type PercentChangeSeriesSource interface {
	Series
	FirstValuesProvider
	LastValuesProvider
	ValuesProvider
	ValueFormatterProvider
}
type PercentChangeSeries struct {
	Name        string
	Style       Style
	YAxis       YAxisType
	InnerSeries PercentChangeSeriesSource
}
func (pcs PercentChangeSeries) GetName() string {
	return pcs.Name
}
func (pcs PercentChangeSeries) GetStyle() Style {
	return pcs.Style
}
func (pcs PercentChangeSeries) Len() int {
	return pcs.InnerSeries.Len()
}
func (pcs PercentChangeSeries) GetFirstValues() (x, y float64) {
	return pcs.InnerSeries.GetFirstValues()
}
func (pcs PercentChangeSeries) GetValues(index int) (x, y float64) {
	_, fy := pcs.InnerSeries.GetFirstValues()
	x0, y0 := pcs.InnerSeries.GetValues(index)
	x = x0
	y = PercentDifference(fy, y0)
	return
}
func (pcs PercentChangeSeries) GetValueFormatters() (x, y ValueFormatter) {
	x, _ = pcs.InnerSeries.GetValueFormatters()
	y = PercentValueFormatter
	return
}