go-chart/value_provider.go
Chris Redford b3dc3fef3c Separation of DotColorProvider and ColorProvider Interfaces (#34)
* fully functioning Viridis

* pure functions
2017-04-17 16:21:02 -07:00

47 lines
1.5 KiB
Go

package chart
import "github.com/wcharczuk/go-chart/drawing"
// 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() (x, y1, y2 float64)
}
// FullValueProvider is an interface that combines `ValueProvider` and `LastValueProvider`
type FullValueProvider interface {
ValueProvider
LastValueProvider
}
// FullBoundedValueProvider is an interface that combines `BoundedValueProvider` and `BoundedLastValueProvider`
type FullBoundedValueProvider interface {
BoundedValueProvider
BoundedLastValueProvider
}
// SizeProvider is a provider for integer size.
type SizeProvider func(xrange, yrange Range, x, y float64) float64
// ColorProvider is a general provider for color ranges based on values.
type ColorProvider func(v, vmin, vmax float64) drawing.Color
// DotColorProvider is a provider for dot color.
type DotColorProvider func(xrange, yrange Range, x, y float64) drawing.Color