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Preserve the unit when interpolating/adding angles with matching units.

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If the units of two angles being interpolated/added matches, we should preserve
the original unit; otherwise, we fall back to radians. This matches the behavior
of Gecko.
This commit is contained in:
Mantaroh Yoshinaga 2017-06-13 10:37:38 +09:00
parent 8c58736989
commit ccf08bcead
1 changed files with 14 additions and 3 deletions
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17
components/style/properties/helpers/animated_properties.mako.rs
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@ -936,9 +936,20 @@ impl Animatable for i32 {
impl Animatable for Angle {
#[inline]
fn add_weighted(&self, other: &Angle, self_portion: f64, other_portion: f64) -> Result<Self, ()> {
self.radians()
.add_weighted(&other.radians(), self_portion, other_portion)
.map(Angle::from_radians)
match (*self, *other) {
% for angle_type in [ 'Degree', 'Gradian', 'Turn' ]:
(Angle::${angle_type}(val1), Angle::${angle_type}(val2)) => {
Ok(Angle::${angle_type}(
try!(val1.add_weighted(&val2, self_portion, other_portion))
))
}
% endfor
_ => {
self.radians()
.add_weighted(&other.radians(), self_portion, other_portion)
.map(Angle::from_radians)
}
}
}
}