go-chart/value_provider.go

package chart

// ValueProvider is a type that produces values.
type ValueProvider interface {
	Len() int
	GetValue(index int) (float64, float64)
}

// BoundedValueProvider allows series to return a range.
type BoundedValueProvider interface {
	Len() int
	GetBoundedValue(index int) (x, y1, y2 float64)
}

// LastValueProvider is a special type of value provider that can return it's (potentially computed) last value.
type LastValueProvider interface {
	GetLastValue() (x, y float64)
}

// BoundedLastValueProvider is a special type of value provider that can return it's (potentially computed) bounded last value.
type BoundedLastValueProvider interface {
	GetBoundedLastValue(index int) (x, y1, y2 float64)
}