sparkchart.go
func (b *SparkChart) SetAutoScale(auto bool) {
	b.mtx.Lock()
	defer b.mtx.Unlock()

	b.autosize = auto
}
func (b *SparkChart) SetAutoScale(auto bool) {
	b.mtx.Lock()
	defer b.mtx.Unlock()

	b.autosize = auto
}
// SetAutoScale changes the way of scaling the data flow