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types: add RoundDownQuantityByPrecision

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c9s 2023-05-15 16:29:25 +08:00
parent df842a04ee
commit aff5447e71
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1 changed files with 6 additions and 0 deletions
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6
pkg/types/market.go
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@ -70,6 +70,12 @@ func (m Market) TruncateQuantity(quantity fixedpoint.Value) fixedpoint.Value {
return fixedpoint.MustNewFromString(qs)
}
// RoundDownQuantityByPrecision uses the volume precision to round down the quantity
// This is different from the TruncateQuantity, which uses StepSize (it uses fewer fractions to truncate)
func (m Market) RoundDownQuantityByPrecision(quantity fixedpoint.Value) fixedpoint.Value {
return quantity.Round(m.VolumePrecision, fixedpoint.Down)
}
func (m Market) TruncatePrice(price fixedpoint.Value) fixedpoint.Value {
return fixedpoint.MustNewFromString(m.FormatPrice(price))
}