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Normalize the direction vector for rotate

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This commit is contained in:
Michael Howell 2016-06-27 08:04:55 -07:00
parent cab6260c32
commit 0dd99e6bd2
1 changed files with 4 additions and 0 deletions
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4
components/style/properties/helpers/animated_properties.mako.rs
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@ -664,6 +664,10 @@ fn interpolate_transform_list(from_list: &[TransformOperation],
}
(&TransformOperation::Rotate(fx, fy, fz, fa),
&TransformOperation::Rotate(tx, ty, tz, ta)) => {
let norm_f = ((fx * fx) + (fy * fy) + (fz * fz)).sqrt();
let norm_t = ((tx * tx) + (ty * ty) + (tz * tz)).sqrt();
let (fx, fy, fz) = (fx / norm_f, fy / norm_f, fz / norm_f);
let (tx, ty, tz) = (tx / norm_t, ty / norm_t, tz / norm_t);
if fx == tx && fy == ty && fz == tz {
let ia = fa.interpolate(&ta, time).unwrap();
result.push(TransformOperation::Rotate(fx, fy, fz, ia));