87 lines
2.5 KiB
Rust
87 lines
2.5 KiB
Rust
use crate::prelude::*;
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/// A line from one point to another.
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///
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/// # Example
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/// ```example
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/// #set page(height: 100pt)
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///
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/// #line(length: 100%)
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/// #line(end: (50%, 50%))
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/// #line(
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/// length: 4cm,
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/// stroke: 2pt + maroon,
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/// )
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/// ```
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#[elem(Layout)]
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pub struct LineElem {
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/// The start point of the line.
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///
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/// Must be an array of exactly two relative lengths.
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#[resolve]
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pub start: Axes<Rel<Length>>,
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/// The offset from `start` where the line ends.
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#[resolve]
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pub end: Option<Axes<Rel<Length>>>,
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/// The line's length. This is only respected if `end` is `none`.
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#[resolve]
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#[default(Abs::pt(30.0).into())]
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pub length: Rel<Length>,
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/// The angle at which the line points away from the origin. This is only
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/// respected if `end` is `none`.
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pub angle: Angle,
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/// How to [stroke]($stroke) the line.
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///
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/// ```example
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/// #set line(length: 100%)
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/// #stack(
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/// spacing: 1em,
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/// line(stroke: 2pt + red),
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/// line(stroke: (paint: blue, thickness: 4pt, cap: "round")),
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/// line(stroke: (paint: blue, thickness: 1pt, dash: "dashed")),
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/// line(stroke: (paint: blue, thickness: 1pt, dash: ("dot", 2pt, 4pt, 2pt))),
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/// )
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/// ```
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#[resolve]
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#[fold]
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pub stroke: Stroke,
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}
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impl Layout for LineElem {
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#[tracing::instrument(name = "LineElem::layout", skip_all)]
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fn layout(
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&self,
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_: &mut Vt,
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styles: StyleChain,
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regions: Regions,
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) -> SourceResult<Fragment> {
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let resolve =
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|axes: Axes<Rel<Abs>>| axes.zip_map(regions.base(), Rel::relative_to);
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let start = resolve(self.start(styles));
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let delta =
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self.end(styles).map(|end| resolve(end) - start).unwrap_or_else(|| {
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let length = self.length(styles);
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let angle = self.angle(styles);
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let x = angle.cos() * length;
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let y = angle.sin() * length;
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resolve(Axes::new(x, y))
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});
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let stroke = self.stroke(styles).unwrap_or_default();
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let size = start.max(start + delta).max(Size::zero());
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let target = regions.expand.select(regions.size, size);
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if !target.is_finite() {
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bail!(error!(self.span(), "cannot create line with infinite length"));
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}
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let mut frame = Frame::soft(target);
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let shape = Geometry::Line(delta.to_point()).stroked(stroke);
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frame.push(start.to_point(), FrameItem::Shape(shape, self.span()));
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Ok(Fragment::frame(frame))
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}
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}
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