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use std::f64::consts::SQRT_2;
use super::prelude::*;
use super::{PadNode, SizedNode};
use crate::util::RcExt;
/// `rect`: A rectangle with optional content.
pub fn rect(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
let width = args.named("width")?;
let height = args.named("height")?;
let fill = args.named("fill")?;
let body = args.find();
Ok(shape_impl(ShapeKind::Rect, width, height, fill, body))
}
/// `square`: A square with optional content.
pub fn square(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
let size = args.named::<Length>("size")?.map(Linear::from);
let width = match size {
None => args.named("width")?,
size => size,
};
let height = match size {
None => args.named("height")?,
size => size,
};
let fill = args.named("fill")?;
let body = args.find();
Ok(shape_impl(ShapeKind::Square, width, height, fill, body))
}
/// `ellipse`: An ellipse with optional content.
pub fn ellipse(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
let width = args.named("width")?;
let height = args.named("height")?;
let fill = args.named("fill")?;
let body = args.find();
Ok(shape_impl(ShapeKind::Ellipse, width, height, fill, body))
}
/// `circle`: A circle with optional content.
pub fn circle(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
let diameter = args.named("radius")?.map(|r: Length| 2.0 * Linear::from(r));
let width = match diameter {
None => args.named("width")?,
diameter => diameter,
};
let height = match diameter {
None => args.named("height")?,
diameter => diameter,
};
let fill = args.named("fill")?;
let body = args.find();
Ok(shape_impl(ShapeKind::Circle, width, height, fill, body))
}
fn shape_impl(
kind: ShapeKind,
width: Option<Linear>,
height: Option<Linear>,
fill: Option<Color>,
body: Option<Template>,
) -> Value {
// Set default fill if there's no fill.
let fill = fill.unwrap_or(Color::Rgba(RgbaColor::gray(175)));
Value::Template(Template::from_inline(move |style| {
let shape = Layout::pack(ShapeNode {
kind,
fill: Some(Paint::Color(fill)),
child: body.as_ref().map(|body| body.pack(style)),
});
if width.is_some() || height.is_some() {
Layout::pack(SizedNode {
sizing: Spec::new(width, height),
child: shape,
})
} else {
shape
}
}))
}
/// Places its child into a sizable and fillable shape.
#[derive(Debug, Hash)]
pub struct ShapeNode {
/// Which shape to place the child into.
pub kind: ShapeKind,
/// How to fill the shape, if at all.
pub fill: Option<Paint>,
/// The child node to place into the shape, if any.
pub child: Option<PackedNode>,
}
/// The type of a shape.
#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
pub enum ShapeKind {
/// A rectangle with equal side lengths.
Square,
/// A quadrilateral with four right angles.
Rect,
/// An ellipse with coinciding foci.
Circle,
/// A curve around two focal points.
Ellipse,
}
impl Layout for ShapeNode {
fn layout(
&self,
ctx: &mut LayoutContext,
regions: &Regions,
) -> Vec<Constrained<Rc<Frame>>> {
// Layout.
let mut frame = if let Some(child) = &self.child {
let mut node: &dyn Layout = child;
let storage;
if matches!(self.kind, ShapeKind::Circle | ShapeKind::Ellipse) {
// Padding with this ratio ensures that a rectangular child fits
// perfectly into a circle / an ellipse.
storage = PadNode {
padding: Sides::splat(Relative::new(0.5 - SQRT_2 / 4.0).into()),
child: child.clone(),
};
node = &storage;
}
// Now, layout the child.
let mut frames = node.layout(ctx, regions);
if matches!(self.kind, ShapeKind::Square | ShapeKind::Circle) {
// Relayout with full expansion into square region to make sure
// the result is really a square or circle.
let size = frames[0].item.size;
let mut pod = regions.clone();
pod.current.w = size.w.max(size.h).min(pod.current.w);
pod.current.h = pod.current.w;
pod.expand = Spec::splat(true);
frames = node.layout(ctx, &pod);
}
// Validate and set constraints.
assert_eq!(frames.len(), 1);
Rc::take(frames.into_iter().next().unwrap().item)
} else {
let default = Length::pt(30.0);
let size = Size::new(
if regions.expand.x && regions.current.w.is_finite() {
regions.current.w
} else {
match self.kind {
ShapeKind::Square | ShapeKind::Circle => default,
ShapeKind::Rect | ShapeKind::Ellipse => 1.5 * default,
}
},
if regions.expand.y && regions.current.h.is_finite() {
regions.current.h
} else {
default
},
);
Frame::new(size, size.h)
};
// Add background shape if desired.
if let Some(fill) = self.fill {
let (pos, geometry) = match self.kind {
ShapeKind::Square | ShapeKind::Rect => {
(Point::zero(), Geometry::Rect(frame.size))
}
ShapeKind::Circle | ShapeKind::Ellipse => {
(frame.size.to_point() / 2.0, Geometry::Ellipse(frame.size))
}
};
frame.prepend(pos, Element::Geometry(geometry, fill));
}
// Generate tight constraints for now.
let mut cts = Constraints::new(regions.expand);
cts.exact = regions.current.to_spec().map(Some);
cts.base = regions.base.to_spec().map(Some);
vec![frame.constrain(cts)]
}
}
|
