sparkchart.go
func (b *SparkChart) ClearData() {
	b.mtx.Lock()
	defer b.mtx.Unlock()

	b.data = make([]float64, 0)
}
func (b *SparkChart) ClearData() {
	b.mtx.Lock()
	defer b.mtx.Unlock()

	b.data = make([]float64, 0)
}
// ClearData removes all bar from chart