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use std::f64::consts::SQRT_2;
use crate::meta::LinkNode;
use crate::prelude::*;
/// A sizable and fillable shape with optional content.
#[derive(Debug, Hash)]
pub struct ShapeNode<const S: ShapeKind>(pub Option<Content>);
/// A square with optional content.
pub type SquareNode = ShapeNode<SQUARE>;
/// A rectangle with optional content.
pub type RectNode = ShapeNode<RECT>;
/// A circle with optional content.
pub type CircleNode = ShapeNode<CIRCLE>;
/// A ellipse with optional content.
pub type EllipseNode = ShapeNode<ELLIPSE>;
#[node(Layout, Inline)]
impl<const S: ShapeKind> ShapeNode<S> {
/// How to fill the shape.
pub const FILL: Option<Paint> = None;
/// How to stroke the shape.
#[property(skip, resolve, fold)]
pub const STROKE: Smart<Sides<Option<PartialStroke>>> = Smart::Auto;
/// How much to pad the shape's content.
#[property(resolve, fold)]
pub const INSET: Sides<Option<Rel<Length>>> = Sides::splat(Rel::zero());
/// How much to extend the shape's dimensions beyond the allocated space.
#[property(resolve, fold)]
pub const OUTSET: Sides<Option<Rel<Length>>> = Sides::splat(Rel::zero());
/// How much to round the shape's corners.
#[property(skip, resolve, fold)]
pub const RADIUS: Corners<Option<Rel<Length>>> = Corners::splat(Rel::zero());
fn construct(_: &Vm, args: &mut Args) -> SourceResult<Content> {
let size = match S {
SQUARE => args.named::<Length>("size")?.map(Rel::from),
CIRCLE => args.named::<Length>("radius")?.map(|r| 2.0 * Rel::from(r)),
_ => None,
};
let width = match size {
None => args.named("width")?,
size => size,
};
let height = match size {
None => args.named("height")?,
size => size,
};
Ok(Self(args.eat()?).pack().boxed(Axes::new(width, height)))
}
fn set(...) {
if is_round(S) {
styles.set_opt(
Self::STROKE,
args.named::<Smart<Option<PartialStroke>>>("stroke")?
.map(|some| some.map(Sides::splat)),
);
} else {
styles.set_opt(Self::STROKE, args.named("stroke")?);
styles.set_opt(Self::RADIUS, args.named("radius")?);
}
}
}
impl<const S: ShapeKind> Layout for ShapeNode<S> {
fn layout(
&self,
vt: &mut Vt,
styles: StyleChain,
regions: &Regions,
) -> SourceResult<Fragment> {
let mut frame;
if let Some(child) = &self.0 {
let mut inset = styles.get(Self::INSET);
if is_round(S) {
inset = inset.map(|side| side + Ratio::new(0.5 - SQRT_2 / 4.0));
}
// Pad the child.
let child = child.clone().padded(inset.map(|side| side.map(Length::from)));
let mut pod = Regions::one(regions.first, regions.base, regions.expand);
frame = child.layout(vt, styles, &pod)?.into_frame();
// Relayout with full expansion into square region to make sure
// the result is really a square or circle.
if is_quadratic(S) {
let length = if regions.expand.x || regions.expand.y {
let target = regions.expand.select(regions.first, Size::zero());
target.x.max(target.y)
} else {
let size = frame.size();
let desired = size.x.max(size.y);
desired.min(regions.first.x).min(regions.first.y)
};
pod.first = Size::splat(length);
pod.expand = Axes::splat(true);
frame = child.layout(vt, styles, &pod)?.into_frame();
}
} else {
// The default size that a shape takes on if it has no child and
// enough space.
let mut size = Size::new(Abs::pt(45.0), Abs::pt(30.0)).min(regions.first);
if is_quadratic(S) {
let length = if regions.expand.x || regions.expand.y {
let target = regions.expand.select(regions.first, Size::zero());
target.x.max(target.y)
} else {
size.x.min(size.y)
};
size = Size::splat(length);
} else {
size = regions.expand.select(regions.first, size);
}
frame = Frame::new(size);
}
// Add fill and/or stroke.
let fill = styles.get(Self::FILL);
let stroke = match styles.get(Self::STROKE) {
Smart::Auto if fill.is_none() => Sides::splat(Some(Stroke::default())),
Smart::Auto => Sides::splat(None),
Smart::Custom(strokes) => {
strokes.map(|s| s.map(PartialStroke::unwrap_or_default))
}
};
let outset = styles.get(Self::OUTSET).relative_to(frame.size());
let size = frame.size() + outset.sum_by_axis();
let radius = styles
.get(Self::RADIUS)
.map(|side| side.relative_to(size.x.min(size.y) / 2.0));
let pos = Point::new(-outset.left, -outset.top);
if fill.is_some() || stroke.iter().any(Option::is_some) {
if is_round(S) {
let shape = ellipse(size, fill, stroke.left);
frame.prepend(pos, Element::Shape(shape));
} else {
frame.prepend_multiple(
rounded_rect(size, radius, fill, stroke)
.into_iter()
.map(|x| (pos, Element::Shape(x))),
)
}
}
// Apply link if it exists.
if let Some(url) = styles.get(LinkNode::DEST) {
frame.link(url.clone());
}
Ok(Fragment::frame(frame))
}
}
impl<const S: ShapeKind> Inline for ShapeNode<S> {}
/// A category of shape.
pub type ShapeKind = usize;
/// A rectangle with equal side lengths.
const SQUARE: ShapeKind = 0;
/// A quadrilateral with four right angles.
const RECT: ShapeKind = 1;
/// An ellipse with coinciding foci.
const CIRCLE: ShapeKind = 2;
/// A curve around two focal points.
const ELLIPSE: ShapeKind = 3;
/// Whether a shape kind is curvy.
fn is_round(kind: ShapeKind) -> bool {
matches!(kind, CIRCLE | ELLIPSE)
}
/// Whether a shape kind has equal side length.
fn is_quadratic(kind: ShapeKind) -> bool {
matches!(kind, SQUARE | CIRCLE)
}
|
