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math: add zpl stuff (#14543)

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David 'Epper' Marshall 2022-06-20 17:17:49 -04:00 committed by GitHub
parent 473d26ce47
commit 524df8da1b
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3 changed files with 43 additions and 15 deletions
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39
vlib/math/const.v
View File

@ -4,21 +4,30 @@
module math module math
pub const ( pub const (
e = 2.71828182845904523536028747135266249775724709369995957496696763 epsilon = 2.2204460492503130808472633361816E-16
pi = 3.14159265358979323846264338327950288419716939937510582097494459 e = 2.71828182845904523536028747135266249775724709369995957496696763
pi_2 = pi / 2.0 pi = 3.14159265358979323846264338327950288419716939937510582097494459
pi_4 = pi / 4.0 pi_2 = pi / 2.0
phi = 1.61803398874989484820458683436563811772030917980576286213544862 pi_4 = pi / 4.0
tau = 6.28318530717958647692528676655900576839433879875021164194988918 phi = 1.61803398874989484820458683436563811772030917980576286213544862
sqrt2 = 1.41421356237309504880168872420969807856967187537694807317667974 tau = 6.28318530717958647692528676655900576839433879875021164194988918
sqrt_e = 1.64872127070012814684865078781416357165377610071014801157507931 one_over_tau = 1.0 / tau
sqrt_pi = 1.77245385090551602729816748334114518279754945612238712821380779 one_over_pi = 1.0 / pi
sqrt_tau = 2.50662827463100050241576528481104525300698674060993831662992357 tau_over2 = tau / 2.0
sqrt_phi = 1.27201964951406896425242246173749149171560804184009624861664038 tau_over4 = tau / 4.0
ln2 = 0.693147180559945309417232121458176568075500134360255254120680009 tau_over8 = tau / 8.0
log2_e = 1.0 / ln2 sqrt2 = 1.41421356237309504880168872420969807856967187537694807317667974
ln10 = 2.30258509299404568401799145468436420760110148862877297603332790 sqrt_3 = 1.73205080756887729352744634150587236694280525381038062805580697
log10_e = 1.0 / ln10 sqrt_5 = 2.23606797749978969640917366873127623544061835961152572427089724
sqrt_e = 1.64872127070012814684865078781416357165377610071014801157507931
sqrt_pi = 1.77245385090551602729816748334114518279754945612238712821380779
sqrt_tau = 2.50662827463100050241576528481104525300698674060993831662992357
sqrt_phi = 1.27201964951406896425242246173749149171560804184009624861664038
ln2 = 0.693147180559945309417232121458176568075500134360255254120680009
log2_e = 1.0 / ln2
ln10 = 2.30258509299404568401799145468436420760110148862877297603332790
log10_e = 1.0 / ln10
two_thirds = 0.66666666666666666666666666666666666666666666666666666666666667
) )
// Floating-point limit values // Floating-point limit values

9
vlib/math/math.v
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@ -42,6 +42,15 @@ pub fn degrees(radians f64) f64 {
return radians * (180.0 / pi) return radians * (180.0 / pi)
} }
// angle_diff calculates the difference between angles in radians
[inline]
pub fn angle_diff(radian_a f64, radian_b f64) f64 {
mut delta := fmod(radian_b - radian_a, tau)
delta = fmod(delta + 1.5 * tau, tau)
delta -= .5 * tau
return delta
}
[params] [params]
pub struct DigitParams { pub struct DigitParams {
base int = 10 base int = 10

10
vlib/math/math_test.v
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@ -222,6 +222,16 @@ fn test_nan() {
assert nan_f32 != nan_f32 assert nan_f32 != nan_f32
} }
fn test_angle_diff() {
for pair in [
[pi, pi_2, -pi_2],
[pi_2 * 3.0, pi_2, -pi],
[pi / 6.0, two_thirds * pi, pi_2],
] {
assert angle_diff(pair[0], pair[1]) == pair[2]
}
}
fn test_acos() { fn test_acos() {
for i := 0; i < math.vf_.len; i++ { for i := 0; i < math.vf_.len; i++ {
a := math.vf_[i] / 10 a := math.vf_[i] / 10