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use std::f64::consts::SQRT_2;
use crate::library::prelude::*;
use crate::library::text::TextNode;
/// Place a node into a sizable and fillable shape.
#[derive(Debug, Hash)]
pub struct ShapeNode<const S: ShapeKind>(pub Option<LayoutNode>);
/// Place a node into a square.
pub type SquareNode = ShapeNode<SQUARE>;
/// Place a node into a rectangle.
pub type RectNode = ShapeNode<RECT>;
/// Place a node into a circle.
pub type CircleNode = ShapeNode<CIRCLE>;
/// Place a node into an ellipse.
pub type EllipseNode = ShapeNode<ELLIPSE>;
#[node]
impl<const S: ShapeKind> ShapeNode<S> {
/// How to fill the shape.
pub const FILL: Option<Paint> = None;
/// How to stroke the shape.
#[property(resolve, fold)]
pub const STROKE: Smart<Option<RawStroke>> = Smart::Auto;
/// How much to pad the shape's content.
pub const PADDING: Relative<RawLength> = Relative::zero();
fn construct(_: &mut Context, args: &mut Args) -> TypResult<Content> {
let size = match S {
SQUARE => args.named::<RawLength>("size")?.map(Relative::from),
CIRCLE => args.named::<RawLength>("radius")?.map(|r| 2.0 * Relative::from(r)),
_ => None,
};
let width = match size {
None => args.named("width")?,
size => size,
};
let height = match size {
None => args.named("height")?,
size => size,
};
Ok(Content::inline(
Self(args.find()?).pack().sized(Spec::new(width, height)),
))
}
}
impl<const S: ShapeKind> Layout for ShapeNode<S> {
fn layout(
&self,
ctx: &mut Context,
regions: &Regions,
styles: StyleChain,
) -> TypResult<Vec<Arc<Frame>>> {
let mut frames;
if let Some(child) = &self.0 {
let mut padding = styles.get(Self::PADDING);
if is_round(S) {
padding.rel += Ratio::new(0.5 - SQRT_2 / 4.0);
}
// Pad the child.
let child = child.clone().padded(Sides::splat(padding));
let mut pod = Regions::one(regions.first, regions.base, regions.expand);
frames = child.layout(ctx, &pod, styles)?;
// 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 = frames[0].size;
let desired = size.x.max(size.y);
desired.min(regions.first.x).min(regions.first.y)
};
pod.first = Size::splat(length);
pod.expand = Spec::splat(true);
frames = child.layout(ctx, &pod, styles)?;
}
} else {
// The default size that a shape takes on if it has no child and
// enough space.
let mut size =
Size::new(Length::pt(45.0), Length::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);
}
frames = vec![Arc::new(Frame::new(size))];
}
let frame = Arc::make_mut(&mut frames[0]);
// Add fill and/or stroke.
let fill = styles.get(Self::FILL);
let stroke = match styles.get(Self::STROKE) {
Smart::Auto => fill.is_none().then(Stroke::default),
Smart::Custom(stroke) => stroke.map(RawStroke::unwrap_or_default),
};
if fill.is_some() || stroke.is_some() {
let geometry = if is_round(S) {
Geometry::Ellipse(frame.size)
} else {
Geometry::Rect(frame.size)
};
let shape = Shape { geometry, fill, stroke };
frame.prepend(Point::zero(), Element::Shape(shape));
}
// Apply link if it exists.
if let Some(url) = styles.get(TextNode::LINK) {
frame.link(url.clone());
}
Ok(frames)
}
}
/// 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)
}
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