44 lines
1.1 KiB
Go
44 lines
1.1 KiB
Go
package chart
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import (
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"fmt"
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"math"
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)
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// Range represents a boundary for a set of numbers.
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type Range struct {
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Min float64
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Max float64
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Domain int
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}
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// IsZero returns if the range has been set or not.
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func (r Range) IsZero() bool {
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return (r.Min == 0 || math.IsNaN(r.Min)) &&
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(r.Max == 0 || math.IsNaN(r.Max)) &&
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r.Domain == 0
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}
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// Delta returns the difference between the min and max value.
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func (r Range) Delta() float64 {
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return r.Max - r.Min
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}
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// String returns a simple string for the range.
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func (r Range) String() string {
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return fmt.Sprintf("Range [%.2f,%.2f] => %d", r.Min, r.Max, r.Domain)
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}
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// Translate maps a given value into the range space.
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func (r Range) Translate(value float64) int {
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normalized := value - r.Min
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ratio := normalized / r.Delta()
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return int(math.Ceil(ratio * float64(r.Domain)))
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}
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// GetRoundedRangeBounds returns some `prettified` range bounds.
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func (r Range) GetRoundedRangeBounds() (min, max float64) {
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delta := r.Max - r.Min
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roundTo := GetRoundToForDelta(delta)
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return RoundDown(r.Min, roundTo), RoundUp(r.Max, roundTo)
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}
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