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use if/else if/else instead of match ()

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It looks more idiomatic.
This commit is contained in:
Jonathan Neuschäfer 2015-03-14 04:09:29 +01:00
parent f4ac3952bd
commit bc8a47fb8d
1 changed files with 33 additions and 37 deletions
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70
src/matrix.rs
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@ -1344,43 +1344,39 @@ impl<S: BaseFloat + 'static> ToQuaternion<S> for Matrix3<S> {
// http://www.cs.ucr.edu/~vbz/resources/quatut.pdf
let trace = self.trace();
let half: S = cast(0.5f64).unwrap();
match () {
() if trace >= zero::<S>() => {
let s = (one::<S>() + trace).sqrt();
let w = half * s;
let s = half / s;
let x = (self[1][2] - self[2][1]) * s;
let y = (self[2][0] - self[0][2]) * s;
let z = (self[0][1] - self[1][0]) * s;
Quaternion::new(w, x, y, z)
}
() if (self[0][0] > self[1][1]) && (self[0][0] > self[2][2]) => {
let s = (half + (self[0][0] - self[1][1] - self[2][2])).sqrt();
let w = half * s;
let s = half / s;
let x = (self[0][1] - self[1][0]) * s;
let y = (self[2][0] - self[0][2]) * s;
let z = (self[1][2] - self[2][1]) * s;
Quaternion::new(w, x, y, z)
}
() if self[1][1] > self[2][2] => {
let s = (half + (self[1][1] - self[0][0] - self[2][2])).sqrt();
let w = half * s;
let s = half / s;
let x = (self[0][1] - self[1][0]) * s;
let y = (self[1][2] - self[2][1]) * s;
let z = (self[2][0] - self[0][2]) * s;
Quaternion::new(w, x, y, z)
}
() => {
let s = (half + (self[2][2] - self[0][0] - self[1][1])).sqrt();
let w = half * s;
let s = half / s;
let x = (self[2][0] - self[0][2]) * s;
let y = (self[1][2] - self[2][1]) * s;
let z = (self[0][1] - self[1][0]) * s;
Quaternion::new(w, x, y, z)
}
if trace >= zero::<S>() {
let s = (one::<S>() + trace).sqrt();
let w = half * s;
let s = half / s;
let x = (self[1][2] - self[2][1]) * s;
let y = (self[2][0] - self[0][2]) * s;
let z = (self[0][1] - self[1][0]) * s;
Quaternion::new(w, x, y, z)
} else if (self[0][0] > self[1][1]) && (self[0][0] > self[2][2]) {
let s = (half + (self[0][0] - self[1][1] - self[2][2])).sqrt();
let w = half * s;
let s = half / s;
let x = (self[0][1] - self[1][0]) * s;
let y = (self[2][0] - self[0][2]) * s;
let z = (self[1][2] - self[2][1]) * s;
Quaternion::new(w, x, y, z)
} else if self[1][1] > self[2][2] {
let s = (half + (self[1][1] - self[0][0] - self[2][2])).sqrt();
let w = half * s;
let s = half / s;
let x = (self[0][1] - self[1][0]) * s;
let y = (self[1][2] - self[2][1]) * s;
let z = (self[2][0] - self[0][2]) * s;
Quaternion::new(w, x, y, z)
} else {
let s = (half + (self[2][2] - self[0][0] - self[1][1])).sqrt();
let w = half * s;
let s = half / s;
let x = (self[2][0] - self[0][2]) * s;
let y = (self[1][2] - self[2][1]) * s;
let z = (self[0][1] - self[1][0]) * s;
Quaternion::new(w, x, y, z)
}
}
}