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|
//! Colorable geometrical shapes.
use std::f64::consts::SQRT_2;
use super::prelude::*;
use super::TextNode;
/// Places its child into a sizable and fillable shape.
#[derive(Debug, Hash)]
pub struct ShapeNode<S: ShapeKind> {
/// Which shape to place the child into.
pub kind: S,
/// The child node to place into the shape, if any.
pub child: Option<PackedNode>,
}
#[class]
impl<S: ShapeKind> ShapeNode<S> {
/// How to fill the shape.
pub const FILL: Option<Paint> = None;
/// How the stroke the shape.
pub const STROKE: Smart<Option<Paint>> = Smart::Auto;
/// The stroke's thickness.
pub const THICKNESS: Length = Length::pt(1.0);
/// How much to pad the shape's content.
pub const PADDING: Linear = Linear::zero();
fn construct(_: &mut EvalContext, args: &mut Args) -> TypResult<Node> {
let size = if !S::ROUND && S::QUADRATIC {
args.named::<Length>("size")?.map(Linear::from)
} else if S::ROUND && S::QUADRATIC {
args.named("radius")?.map(|r: Length| 2.0 * Linear::from(r))
} else {
None
};
let width = match size {
None => args.named("width")?,
size => size,
};
let height = match size {
None => args.named("height")?,
size => size,
};
Ok(Node::inline(
ShapeNode { kind: S::default(), child: args.find() }
.pack()
.sized(Spec::new(width, height)),
))
}
fn set(args: &mut Args, styles: &mut StyleMap) -> TypResult<()> {
styles.set_opt(Self::FILL, args.named("fill")?);
styles.set_opt(Self::STROKE, args.named("stroke")?);
styles.set_opt(Self::THICKNESS, args.named("thickness")?);
styles.set_opt(Self::PADDING, args.named("padding")?);
Ok(())
}
}
impl<S: ShapeKind> Layout for ShapeNode<S> {
fn layout(
&self,
ctx: &mut LayoutContext,
regions: &Regions,
styles: StyleChain,
) -> Vec<Constrained<Rc<Frame>>> {
let mut frames;
if let Some(child) = &self.child {
let mut padding = styles.get(Self::PADDING);
if S::ROUND {
padding.rel += Relative::new(0.5 - SQRT_2 / 4.0);
}
// Pad the child.
let child = child.clone().padded(Sides::splat(padding));
let mut pod = Regions::one(regions.current, 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 S::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, styles);
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 S::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.
let fill = styles.get(Self::FILL);
let thickness = styles.get(Self::THICKNESS);
let stroke = styles
.get(Self::STROKE)
.unwrap_or(fill.is_none().then(|| RgbaColor::BLACK.into()))
.map(|paint| Stroke { paint, thickness });
if fill.is_some() || stroke.is_some() {
let geometry = if S::ROUND {
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_ref(TextNode::LINK) {
frame.link(url);
}
frames
}
}
/// Categorizes shapes.
pub trait ShapeKind: Debug + Default + Hash + 'static {
const ROUND: bool;
const QUADRATIC: bool;
}
/// A rectangle with equal side lengths.
#[derive(Debug, Default, Copy, Clone, Eq, PartialEq, Hash)]
pub struct Square;
impl ShapeKind for Square {
const ROUND: bool = false;
const QUADRATIC: bool = true;
}
/// A quadrilateral with four right angles.
#[derive(Debug, Default, Copy, Clone, Eq, PartialEq, Hash)]
pub struct Rect;
impl ShapeKind for Rect {
const ROUND: bool = false;
const QUADRATIC: bool = false;
}
/// An ellipse with coinciding foci.
#[derive(Debug, Default, Copy, Clone, Eq, PartialEq, Hash)]
pub struct Circle;
impl ShapeKind for Circle {
const ROUND: bool = true;
const QUADRATIC: bool = true;
}
/// A curve around two focal points.
#[derive(Debug, Default, Copy, Clone, Eq, PartialEq, Hash)]
pub struct Ellipse;
impl ShapeKind for Ellipse {
const ROUND: bool = true;
const QUADRATIC: bool = false;
}
|
