go-chart/continuous_range.go

68 lines
1.6 KiB
Go

package chart
import (
"fmt"
"math"
)
// ContinuousRange represents a boundary for a set of numbers.
type ContinuousRange struct {
Min float64
Max float64
Domain int
}
// IsZero returns if the ContinuousRange has been set or not.
func (r ContinuousRange) IsZero() bool {
return (r.Min == 0 || math.IsNaN(r.Min)) &&
(r.Max == 0 || math.IsNaN(r.Max)) &&
r.Domain == 0
}
// GetMin gets the min value for the continuous range.
func (r ContinuousRange) GetMin() float64 {
return r.Min
}
// SetMin sets the min value for the continuous range.
func (r *ContinuousRange) SetMin(min float64) {
r.Min = min
}
// GetMax returns the max value for the continuous range.
func (r ContinuousRange) GetMax() float64 {
return r.Max
}
// SetMax sets the max value for the continuous range.
func (r *ContinuousRange) SetMax(max float64) {
r.Max = max
}
// GetDelta returns the difference between the min and max value.
func (r ContinuousRange) GetDelta() float64 {
return r.Max - r.Min
}
// GetDomain returns the range domain.
func (r ContinuousRange) GetDomain() int {
return r.Domain
}
// SetDomain sets the range domain.
func (r *ContinuousRange) SetDomain(domain int) {
r.Domain = domain
}
// String returns a simple string for the ContinuousRange.
func (r ContinuousRange) String() string {
return fmt.Sprintf("ContinuousRange [%.2f,%.2f] => %d", r.Min, r.Max, r.Domain)
}
// Translate maps a given value into the ContinuousRange space.
func (r ContinuousRange) Translate(value float64) int {
normalized := value - r.Min
ratio := normalized / r.GetDelta()
return int(math.Ceil(ratio * float64(r.Domain)))
}