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package mass
import (
"errors"
"fmt"
)
type Mass float32
const (
Gram Mass = 1
Kilogram Mass = 1_000
Pound Mass = 453.5924
)
type FlowRate float32
const (
KilogramsPerSecond FlowRate = 1
PoundsPerMinute FlowRate = 0.007_559_872_833
)
// FlowRateUnitStrings returns a slice of strings, each representing a
// flowRate unit.
// This is necessary because giu.Combo only works with strings.
func FlowRateUnitStrings() []string {
return []string{"kg/s", "lb/min"}
}
const (
DefaultFlowRateUnit FlowRate = KilogramsPerSecond
// DefaultFlowRateUnitIndex is used to index FlowRateUnitStrings()
DefaultFlowRateUnitIndex int32 = 0 // kg/s
)
func FlowRateUnitFromString(s string) (FlowRate, error) {
// Each case corresponds to a value in FlowRateUnitStrings().
switch s {
case "kg/s":
return KilogramsPerSecond, nil
case "lb/min":
return PoundsPerMinute, nil
default:
return *new(FlowRate), errors.New(
fmt.Sprintf("invalid mass flow rate unit: '%s'", s))
}
}
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