go-chart/range.go
Will Charczuk cbc4672f1e updates.
2016-07-07 14:44:03 -07:00

37 lines
894 B
Go

package chart
import (
"fmt"
"math"
)
// Range represents a continuous range,
type Range struct {
Min float64
Max float64
Domain int
}
// IsZero returns if the range has been set or not.
func (r Range) IsZero() bool {
return r.Min == 0 && r.Max == 0 && r.Domain == 0
}
// Delta returns the difference between the min and max value.
func (r Range) Delta() float64 {
return r.Max - r.Min
}
// String returns a simple string for the range.
func (r Range) String() string {
return fmt.Sprintf("Range [%.2f,%.2f] => %d", r.Min, r.Max, r.Domain)
}
// Translate maps a given value into the range space.
// An example would be a 600 px image, with a min of 10 and a max of 100.
// Translate(50) would yield (50.0/90.0)*600 ~= 333.33
func (r Range) Translate(value float64) int {
finalValue := ((r.Max - value) / r.Delta()) * float64(r.Domain)
return int(math.Floor(finalValue))
}