47 lines
1.1 KiB
Go
47 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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"github.com/blendlabs/go-util"
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)
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// Range represents a continuous range,
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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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Formatter Formatter
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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 && r.Max == 0 && 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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// Format formats the value based on the range's formatter.
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func (r Range) Format(v interface{}) string {
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if r.Formatter != nil {
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return r.Formatter(v)
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}
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return util.StringEmpty
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}
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// Translate maps a given value into the range space.
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// An example would be a 600 px image, with a min of 10 and a max of 100.
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// Translate(50) would yield (50.0/90.0)*600 ~= 333.33
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func (r Range) Translate(value float64) int {
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finalValue := ((r.Max - value) / r.Delta()) * float64(r.Domain)
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return int(math.Floor(finalValue))
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}
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