go-chart/value_provider.go

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package chart
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import "github.com/wcharczuk/go-chart/drawing"
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// ValueProvider is a type that produces values.
type ValueProvider interface {
Len() int
GetValue(index int) (float64, float64)
}
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// 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 {
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GetBoundedLastValue() (x, y1, y2 float64)
}
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// FullValueProvider is an interface that combines `ValueProvider` and `LastValueProvider`
type FullValueProvider interface {
ValueProvider
LastValueProvider
}
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// FullBoundedValueProvider is an interface that combines `BoundedValueProvider` and `BoundedLastValueProvider`
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type FullBoundedValueProvider interface {
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BoundedValueProvider
BoundedLastValueProvider
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}
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// SizeProvider is a provider for integer size.
type SizeProvider func(rx, ry, x, y float64) float64
// ColorProvider is a provider for dot size.
type ColorProvider func(rx, ry, x, y float64) drawing.Color