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Diffstat (limited to 'library/src/visualize/path.rs')
| -rw-r--r-- | library/src/visualize/path.rs | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/library/src/visualize/path.rs b/library/src/visualize/path.rs deleted file mode 100644 index d78abce1..00000000 --- a/library/src/visualize/path.rs +++ /dev/null @@ -1,211 +0,0 @@ -use kurbo::{CubicBez, ParamCurveExtrema}; -use typst::eval::Reflect; - -use crate::prelude::*; - -use PathVertex::{AllControlPoints, MirroredControlPoint, Vertex}; - -/// A path through a list of points, connected by Bezier curves. -/// -/// ## Example { #example } -/// ```example -/// #path( -/// fill: blue.lighten(80%), -/// stroke: blue, -/// closed: true, -/// (0pt, 50pt), -/// (100%, 50pt), -/// ((50%, 0pt), (40pt, 0pt)), -/// ) -/// ``` -/// -/// Display: Path -/// Category: visualize -#[element(Layout)] -pub struct PathElem { - /// How to fill the path. See the - /// [rectangle's documentation]($func/rect.fill) for more details. - /// - /// Currently all paths are filled according to the - /// [non-zero winding rule](https://en.wikipedia.org/wiki/Nonzero-rule). - pub fill: Option<Paint>, - - /// How to stroke the path. This can be: - /// - /// See the [line's documentation]($func/line.stroke) for more details. Can - /// be set to `{none}` to disable the stroke or to `{auto}` for a stroke of - /// `{1pt}` black if and if only if no fill is given. - #[resolve] - #[fold] - pub stroke: Smart<Option<PartialStroke>>, - - /// Whether to close this path with one last bezier curve. This curve will - /// takes into account the adjacent control points. If you want to close - /// with a straight line, simply add one last point that's the same as the - /// start point. - #[default(false)] - pub closed: bool, - - /// The vertices of the path. - /// - /// Each vertex can be defined in 3 ways: - /// - /// - A regular point, as given to the [`line`]($func/line) or - /// [`polygon`]($func/polygon) function. - /// - An array of two points, the first being the vertex and the second - /// being the control point. The control point is expressed relative to - /// the vertex and is mirrored to get the second control point. The given - /// control point is the one that affects the curve coming _into_ this - /// vertex (even for the first point). The mirrored control point affects - /// the curve going out of this vertex. - /// - An array of three points, the first being the vertex and the next - /// being the control points (control point for curves coming in and out, - /// respectively) - #[variadic] - pub vertices: Vec<PathVertex>, -} - -impl Layout for PathElem { - #[tracing::instrument(name = "PathElem::layout", skip_all)] - fn layout( - &self, - _: &mut Vt, - styles: StyleChain, - regions: Regions, - ) -> SourceResult<Fragment> { - let resolve = |axes: Axes<Rel<Length>>| { - axes.resolve(styles) - .zip(regions.base()) - .map(|(l, b)| l.relative_to(b)) - .to_point() - }; - - let vertices: Vec<PathVertex> = self.vertices(); - let points: Vec<Point> = vertices.iter().map(|c| resolve(c.vertex())).collect(); - - let mut size = Size::zero(); - if points.is_empty() { - return Ok(Fragment::frame(Frame::new(size))); - } - - // Only create a path if there are more than zero points. - // Construct a closed path given all points. - let mut path = Path::new(); - path.move_to(points[0]); - - let mut add_cubic = - |from_point: Point, to_point: Point, from: PathVertex, to: PathVertex| { - let from_control_point = resolve(from.control_point_from()) + from_point; - let to_control_point = resolve(to.control_point_to()) + to_point; - path.cubic_to(from_control_point, to_control_point, to_point); - - let p0 = kurbo::Point::new(from_point.x.to_raw(), from_point.y.to_raw()); - let p1 = kurbo::Point::new( - from_control_point.x.to_raw(), - from_control_point.y.to_raw(), - ); - let p2 = kurbo::Point::new( - to_control_point.x.to_raw(), - to_control_point.y.to_raw(), - ); - let p3 = kurbo::Point::new(to_point.x.to_raw(), to_point.y.to_raw()); - let extrema = CubicBez::new(p0, p1, p2, p3).bounding_box(); - size.x.set_max(Abs::raw(extrema.x1)); - size.y.set_max(Abs::raw(extrema.y1)); - }; - - for (vertex_window, point_window) in vertices.windows(2).zip(points.windows(2)) { - let from = vertex_window[0]; - let to = vertex_window[1]; - let from_point = point_window[0]; - let to_point = point_window[1]; - - add_cubic(from_point, to_point, from, to); - } - - if self.closed(styles) { - let from = *vertices.last().unwrap(); // We checked that we have at least one element. - let to = vertices[0]; - let from_point = *points.last().unwrap(); - let to_point = points[0]; - - add_cubic(from_point, to_point, from, to); - path.close_path(); - } - - // Prepare fill and stroke. - let fill = self.fill(styles); - let stroke = match self.stroke(styles) { - Smart::Auto if fill.is_none() => Some(Stroke::default()), - Smart::Auto => None, - Smart::Custom(stroke) => stroke.map(PartialStroke::unwrap_or_default), - }; - - let mut frame = Frame::new(size); - let shape = Shape { geometry: Geometry::Path(path), stroke, fill }; - frame.push(Point::zero(), FrameItem::Shape(shape, self.span())); - - Ok(Fragment::frame(frame)) - } -} - -#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)] -pub enum PathVertex { - Vertex(Axes<Rel<Length>>), - MirroredControlPoint(Axes<Rel<Length>>, Axes<Rel<Length>>), - AllControlPoints(Axes<Rel<Length>>, Axes<Rel<Length>>, Axes<Rel<Length>>), -} - -impl PathVertex { - pub fn vertex(&self) -> Axes<Rel<Length>> { - match self { - Vertex(x) => *x, - MirroredControlPoint(x, _) => *x, - AllControlPoints(x, _, _) => *x, - } - } - - pub fn control_point_from(&self) -> Axes<Rel<Length>> { - match self { - Vertex(_) => Axes::new(Rel::zero(), Rel::zero()), - MirroredControlPoint(_, a) => a.map(|x| -x), - AllControlPoints(_, _, b) => *b, - } - } - - pub fn control_point_to(&self) -> Axes<Rel<Length>> { - match self { - Vertex(_) => Axes::new(Rel::zero(), Rel::zero()), - MirroredControlPoint(_, a) => *a, - AllControlPoints(_, a, _) => *a, - } - } -} - -cast! { - PathVertex, - self => match self { - Vertex(x) => x.into_value(), - MirroredControlPoint(x, c) => array![x, c].into_value(), - AllControlPoints(x, c1, c2) => array![x, c1, c2].into_value(), - }, - array: Array => { - let mut iter = array.into_iter(); - match (iter.next(), iter.next(), iter.next(), iter.next()) { - (Some(a), None, None, None) => { - Vertex(a.cast()?) - }, - (Some(a), Some(b), None, None) => { - if Axes::<Rel<Length>>::castable(&a) { - MirroredControlPoint(a.cast()?, b.cast()?) - } else { - Vertex(Axes::new(a.cast()?, b.cast()?)) - } - }, - (Some(a), Some(b), Some(c), None) => { - AllControlPoints(a.cast()?, b.cast()?, c.cast()?) - }, - _ => bail!("path vertex must have 1, 2, or 3 points"), - } - }, -} |