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|
//! Colorable geometrical shapes.
use std::f64::consts::SQRT_2;
use super::prelude::*;
use super::LinkNode;
/// `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")?;
shape_impl(args, ShapeKind::Rect, width, height)
}
/// `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,
};
shape_impl(args, ShapeKind::Square, width, height)
}
/// `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")?;
shape_impl(args, ShapeKind::Ellipse, width, height)
}
/// `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,
};
shape_impl(args, ShapeKind::Circle, width, height)
}
fn shape_impl(
args: &mut Args,
kind: ShapeKind,
width: Option<Linear>,
height: Option<Linear>,
) -> TypResult<Value> {
// The default appearance of a shape.
let default = Stroke {
paint: RgbaColor::BLACK.into(),
thickness: Length::pt(1.0),
};
// Parse fill & stroke.
let fill = args.named("fill")?.unwrap_or(None);
let stroke = match (args.named("stroke")?, args.named("thickness")?) {
(None, None) => fill.is_none().then(|| default),
(color, thickness) => color.unwrap_or(Some(default.paint)).map(|paint| Stroke {
paint,
thickness: thickness.unwrap_or(default.thickness),
}),
};
// Shorthand for padding.
let mut padding = args.named::<Linear>("padding")?.unwrap_or_default();
// Padding with this ratio ensures that a rectangular child fits
// perfectly into a circle / an ellipse.
if kind.is_round() {
padding.rel += Relative::new(0.5 - SQRT_2 / 4.0);
}
// The shape's contents.
let child = args
.find()
.map(|body: Node| body.into_block().padded(Sides::splat(padding)));
Ok(Value::inline(
ShapeNode { kind, fill, stroke, child }
.pack()
.sized(Spec::new(width, height)),
))
}
/// 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.
pub fill: Option<Paint>,
/// How the stroke the shape.
pub stroke: Option<Stroke>,
/// The child node to place into the shape, if any.
pub child: Option<PackedNode>,
}
impl Layout for ShapeNode {
fn layout(
&self,
ctx: &mut LayoutContext,
regions: &Regions,
) -> Vec<Constrained<Rc<Frame>>> {
let mut frames;
if let Some(child) = &self.child {
let mut pod = Regions::one(regions.current, regions.base, regions.expand);
frames = child.layout(ctx, &pod);
// Relayout with full expansion into square region to make sure
// the result is really a square or circle.
if self.kind.is_quadratic() {
let length = if regions.expand.x || regions.expand.y {
let target = regions.expand.select(regions.current, Size::zero());
target.x.max(target.y)
} else {
let size = frames[0].item.size;
let desired = size.x.max(size.y);
desired.min(regions.current.x).min(regions.current.y)
};
pod.current = Size::splat(length);
pod.expand = Spec::splat(true);
frames = child.layout(ctx, &pod);
frames[0].cts = Constraints::tight(regions);
}
} 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.current);
if self.kind.is_quadratic() {
let length = if regions.expand.x || regions.expand.y {
let target = regions.expand.select(regions.current, Size::zero());
target.x.max(target.y)
} else {
size.x.min(size.y)
};
size = Size::splat(length);
} else {
size = regions.expand.select(regions.current, size);
}
frames = vec![Frame::new(size).constrain(Constraints::tight(regions))];
}
let frame = Rc::make_mut(&mut frames[0].item);
// Add fill and/or stroke.
if self.fill.is_some() || self.stroke.is_some() {
let geometry = match self.kind {
ShapeKind::Square | ShapeKind::Rect => Geometry::Rect(frame.size),
ShapeKind::Circle | ShapeKind::Ellipse => Geometry::Ellipse(frame.size),
};
let shape = Shape {
geometry,
fill: self.fill,
stroke: self.stroke,
};
frame.prepend(Point::zero(), Element::Shape(shape));
}
// Apply link if it exists.
if let Some(url) = ctx.styles.get_ref(LinkNode::URL) {
frame.link(url);
}
frames
}
}
/// 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 ShapeKind {
/// Whether the shape is curved.
pub fn is_round(self) -> bool {
matches!(self, Self::Circle | Self::Ellipse)
}
/// Whether the shape has a fixed 1-1 aspect ratio.
pub fn is_quadratic(self) -> bool {
matches!(self, Self::Square | Self::Circle)
}
}
|
