barchart.go
func (b *BarChart) ClearData() {
	b.mtx.Lock()
	defer b.mtx.Unlock()

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

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