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use fj_interop::{ext::ArrayExt, Color};
use fj_math::{Point, Scalar, Vector};
use crate::{
geometry::SurfaceGeometry,
objects::{Cycle, Face, HalfEdge, Region, Vertex},
operations::{
build::{BuildCycle, BuildHalfEdge},
geometry::UpdateHalfEdgeGeometry,
insert::Insert,
presentation::SetColor,
update::{UpdateCycle, UpdateHalfEdge},
},
storage::Handle,
Core,
};
use super::{vertex::SweepVertex, SweepCache, SweepSurfacePath};
/// # Sweep a [`HalfEdge`]
///
/// See [module documentation] for more information.
///
/// [module documentation]: super
pub trait SweepHalfEdge {
/// # Sweep the [`HalfEdge`]
///
/// Returns a face, the result of sweeping the edge, as well as the top edge
/// of that face, i.e. the edge that is the version of the original edge
/// that was translated along the sweep path.
///
/// In addition to the usual arguments that many sweep operations require,
/// some other ones are needed:
///
/// - `end_vertex`, the vertex where the half-edge ends. This is the start
/// vertex of the next half-edge in the cycle.
/// - The `surface` that the half-edge is defined on.
/// - The `color` of the resulting face, if applicable
fn sweep_half_edge(
&self,
end_vertex: Handle<Vertex>,
surface: &SurfaceGeometry,
color: Option<Color>,
path: impl Into<Vector<3>>,
cache: &mut SweepCache,
core: &mut Core,
) -> (Face, Handle<HalfEdge>);
}
impl SweepHalfEdge for Handle<HalfEdge> {
fn sweep_half_edge(
&self,
end_vertex: Handle<Vertex>,
surface: &SurfaceGeometry,
color: Option<Color>,
path: impl Into<Vector<3>>,
cache: &mut SweepCache,
core: &mut Core,
) -> (Face, Handle<HalfEdge>) {
let path = path.into();
let surface = core
.layers
.geometry
.of_half_edge(self)
.path
.sweep_surface_path(surface, path, core);
// Next, we need to define the boundaries of the face. Let's start with
// the global vertices and edges.
let (vertices, curves) = {
let [a, b] = [self.start_vertex().clone(), end_vertex];
let (curve_up, c) = b.clone().sweep_vertex(cache, core);
let (curve_down, d) = a.clone().sweep_vertex(cache, core);
(
[a, b, c, d],
[
Some(self.curve().clone()),
Some(curve_up),
None,
Some(curve_down),
],
)
};
// Let's figure out the surface coordinates of the edge vertices.
let surface_points = {
let [a, b] = self.boundary().inner;
[
[a.t, Scalar::ZERO],
[b.t, Scalar::ZERO],
[b.t, Scalar::ONE],
[a.t, Scalar::ONE],
]
.map(Point::from)
};
let surface_points_next = {
let mut points = surface_points;
points.rotate_left(1);
points
};
// Now, the boundaries of each edge.
let boundaries = {
let [a, b] = self.boundary().inner;
let [c, d] = [0., 1.].map(|coord| Point::from([coord]));
[[a, b], [c, d], [b, a], [d, c]]
};
let mut exterior = Cycle::empty();
// Armed with all of that, we're ready to create the edges.
let [_edge_bottom, _edge_up, edge_top, _edge_down] = boundaries
.zip_ext(surface_points)
.zip_ext(surface_points_next)
.zip_ext(vertices)
.zip_ext(curves)
.map(|((((boundary, start), end), start_vertex), curve)| {
let half_edge = {
let line_segment = HalfEdge::line_segment(
[start, end],
Some(boundary),
core,
);
let half_edge = line_segment
.update_start_vertex(|_, _| start_vertex, core);
let half_edge = if let Some(curve) = curve {
half_edge.update_curve(|_, _| curve, core)
} else {
half_edge
};
half_edge.insert(core).set_path(
core.layers.geometry.of_half_edge(&line_segment).path,
&mut core.layers.geometry,
)
};
exterior = exterior.add_half_edges([half_edge.clone()], core);
half_edge
});
let exterior = exterior.insert(core);
let region = Region::new(exterior, []).insert(core);
if let Some(color) = color {
region.set_color(color, core);
}
let face = Face::new(surface, region);
(face, edge_top)
}
}