go-chart/concat_series.go

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package chart
// ConcatSeries is a special type of series that concatenates its `InnerSeries`.
type ConcatSeries []Series
// Len returns the length of the concatenated set of series.
func (cs ConcatSeries) Len() int {
total := 0
for _, s := range cs {
if typed, isValueProvider := s.(ValueProvider); isValueProvider {
total += typed.Len()
}
}
return total
}
// GetValue returns the value at the (meta) index (i.e 0 => totalLen-1)
func (cs ConcatSeries) GetValue(index int) (x, y float64) {
cursor := 0
for _, s := range cs {
if typed, isValueProvider := s.(ValueProvider); isValueProvider {
len := typed.Len()
if index < cursor+len {
x, y = typed.GetValue(index - cursor) //FENCEPOSTS.
return
}
cursor += typed.Len()
}
}
return
}