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More docs in style.

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Follow up to #14802.
This commit is contained in:
Simon Sapin 2017-01-02 10:40:20 +01:00
parent e995af9cff
commit 125a216bde
2 changed files with 9 additions and 3 deletions
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10
components/style/bezier.rs
View file

@ -12,7 +12,7 @@ use euclid::point::Point2D;
const NEWTON_METHOD_ITERATIONS: u8 = 8; const NEWTON_METHOD_ITERATIONS: u8 = 8;
/// A Bézier curve. /// A unit cubic Bézier curve, used for timing functions in CSS transitions and animations.
pub struct Bezier { pub struct Bezier {
ax: f64, ax: f64,
bx: f64, bx: f64,
@ -23,7 +23,13 @@ pub struct Bezier {
} }
impl Bezier { impl Bezier {
/// Create a Bézier curve from two control points. /// Create a unit cubic Bézier curve from the two middle control points.
///
/// X coordinate is time, Y coordinate is function advancement.
/// The nominal range for both is 0 to 1.
///
/// The start and end points are always (0, 0) and (1, 1) so that a transition or animation
/// starts at 0% and ends at 100%.
#[inline] #[inline]
pub fn new(p1: Point2D<f64>, p2: Point2D<f64>) -> Bezier { pub fn new(p1: Point2D<f64>, p2: Point2D<f64>) -> Bezier {
let cx = 3.0 * p1.x; let cx = 3.0 * p1.x;

2
components/style/properties/declaration_block.rs
View file

@ -492,7 +492,7 @@ pub fn parse_style_attribute(input: &str,
} }
/// Parse a given property declaration. Can result in multiple /// Parse a given property declaration. Can result in multiple
/// `PropertyDeclaration`s when expanding a longhand, for example. /// `PropertyDeclaration`s when expanding a shorthand, for example.
pub fn parse_one_declaration(id: PropertyId, pub fn parse_one_declaration(id: PropertyId,
input: &str, input: &str,
base_url: &ServoUrl, base_url: &ServoUrl,