mirror of
https://github.com/42wim/matterbridge.git
synced 2024-11-24 11:42:03 -08:00
53cafa9f3d
This commit adds support for go/cgo tgs conversion when building with the -tags `cgo` The default binaries are still "pure" go and uses the old way of converting. * Move lottie_convert.py conversion code to its own file * Add optional libtgsconverter * Update vendor * Apply suggestions from code review * Update bridge/helper/libtgsconverter.go Co-authored-by: Wim <wim@42.be>
45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
package dectofrac
|
|
|
|
import (
|
|
"math"
|
|
"math/big"
|
|
)
|
|
|
|
// MaxIterations is some sane limit of iterations for precision mode
|
|
const MaxIterations = 5000
|
|
|
|
// NewRatI returns rational from decimal
|
|
// using `iterations` number of iterations in Continued Fraction algorythm
|
|
func NewRatI(val float64, iterations int64) *big.Rat {
|
|
return NewRat(val, iterations, 0)
|
|
}
|
|
|
|
// NewRatP returns rational from decimal
|
|
// by going as mush iterations, until next fraction is less than `stepPrecision`
|
|
func NewRatP(val float64, stepPrecision float64) *big.Rat {
|
|
return NewRat(val, MaxIterations, stepPrecision)
|
|
}
|
|
|
|
func NewRat(val float64, iterations int64, stepPrecision float64) *big.Rat {
|
|
a0 := int64(math.Floor(val))
|
|
x0 := val - float64(a0)
|
|
rat := cf(x0, 1, iterations, stepPrecision)
|
|
return rat.Add(rat, new(big.Rat).SetInt64(a0))
|
|
}
|
|
|
|
func cf(xi float64, i int64, limit int64, stepPrecision float64) *big.Rat {
|
|
if i >= limit || xi <= stepPrecision {
|
|
return big.NewRat(0, 1)
|
|
}
|
|
|
|
inverted := 1 / xi
|
|
aj := int64(math.Floor(inverted))
|
|
xj := inverted - float64(aj)
|
|
ratAJ := new(big.Rat).SetInt64(aj)
|
|
ratNext := cf(xj, i+1, limit, stepPrecision)
|
|
res := ratAJ.Add(ratAJ, ratNext)
|
|
res = res.Inv(res)
|
|
|
|
return res
|
|
}
|