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use fj_math::Scalar;
use crate::{
algorithms::transform::TransformObject,
objects::{
Curve, Cycle, Face, HalfEdge, Shell, Surface, SurfaceVertex, Vertex,
},
partial::HasPartial,
stores::{Handle, Stores},
};
/// API for building a [`Shell`]
///
/// Also see [`Shell::builder`].
pub struct ShellBuilder<'a> {
/// The stores that the created objects are put in
pub stores: &'a Stores,
}
impl<'a> ShellBuilder<'a> {
/// Create a cube from the length of its edges
pub fn build_cube_from_edge_length(
self,
edge_length: impl Into<Scalar>,
) -> Shell {
let edge_length = edge_length.into();
// Let's define some short-hands. We're going to need them a lot.
const Z: Scalar = Scalar::ZERO;
let h = edge_length / 2.;
let bottom = {
let surface = self
.stores
.surfaces
.insert(Surface::xy_plane())
.translate([Z, Z, -h], self.stores);
Face::builder(self.stores, surface)
.with_exterior_polygon_from_points([
[-h, -h],
[h, -h],
[h, h],
[-h, h],
])
.build()
};
let (sides, top_edges) = {
let surfaces = bottom
.exterior()
.half_edges()
.map(|half_edge| {
let [a, b] = half_edge
.vertices()
.clone()
.map(|vertex| vertex.global_form().position());
let c = a + [Z, Z, edge_length];
self.stores
.surfaces
.insert(Surface::plane_from_points([a, b, c]))
})
.collect::<Vec<_>>();
let bottoms = bottom
.exterior()
.half_edges()
.zip(&surfaces)
.map(|(half_edge, surface)| {
HalfEdge::partial()
.with_surface(Some(surface.clone()))
.with_global_form(Some(half_edge.global_form().clone()))
.as_line_segment_from_points([[Z, Z], [edge_length, Z]])
.build(self.stores)
})
.collect::<Vec<_>>();
let sides_up = bottoms
.clone()
.into_iter()
.zip(&surfaces)
.map(|(bottom, surface)| {
let [_, from] = bottom.vertices();
let from = from.surface_form().clone();
let to = SurfaceVertex::partial()
.with_position(Some(from.position() + [Z, edge_length]))
.with_surface(Some(surface.clone()));
HalfEdge::partial()
.with_vertices(Some([
Vertex::partial().with_surface_form(Some(from)),
Vertex::partial().with_surface_form(Some(to)),
]))
.as_line_segment()
.build(self.stores)
})
.collect::<Vec<_>>();
let sides_down = {
let mut sides_up_prev = sides_up.clone();
sides_up_prev.rotate_right(1);
bottoms
.clone()
.into_iter()
.zip(sides_up_prev)
.zip(&surfaces)
.map(|((bottom, side_up_prev), surface)| {
let [_, from] = side_up_prev.vertices();
let [to, _] = bottom.vertices();
let to = to.surface_form().clone();
let from = SurfaceVertex::partial()
.with_position(Some(
to.position() + [Z, edge_length],
))
.with_surface(Some(surface.clone()))
.with_global_form(Some(from.global_form().clone()));
let curve = Handle::<Curve>::partial()
.with_global_form(Some(
side_up_prev.curve().global_form().clone(),
));
HalfEdge::partial()
.with_curve(Some(curve))
.with_vertices(Some([
Vertex::partial().with_surface_form(Some(from)),
Vertex::partial().with_surface_form(Some(to)),
]))
.as_line_segment()
.build(self.stores)
})
.collect::<Vec<_>>()
};
let tops = sides_up
.clone()
.into_iter()
.zip(sides_down.clone())
.zip(&surfaces)
.map(|((side_up, side_down), surface)| {
let [_, from] = side_up.vertices();
let [to, _] = side_down.vertices();
let from = from.surface_form().clone();
let to = SurfaceVertex::partial()
.with_position(Some(
from.position() + [-edge_length, Z],
))
.with_surface(Some(surface.clone()))
.with_global_form(Some(to.global_form().clone()));
let from = Vertex::partial().with_surface_form(Some(from));
let to = Vertex::partial().with_surface_form(Some(to));
HalfEdge::partial()
.with_vertices(Some([from, to]))
.as_line_segment()
.build(self.stores)
})
.collect::<Vec<_>>();
let sides = bottoms
.into_iter()
.zip(sides_up)
.zip(tops.clone())
.zip(sides_down)
.zip(surfaces)
.map(|((((bottom, side_up), top), side_down), surface)| {
let cycle = Cycle::partial()
.with_surface(Some(surface))
.with_half_edges([bottom, side_up, top, side_down])
.build(self.stores);
Face::from_exterior(cycle)
});
(sides, tops)
};
let top = {
let surface = self
.stores
.surfaces
.insert(Surface::xy_plane())
.translate([Z, Z, h], self.stores);
let points = [[-h, -h], [-h, h], [h, h], [h, -h], [-h, -h]];
let mut top_edges = top_edges;
top_edges.reverse();
let mut edges = Vec::new();
for (points, edge) in points.windows(2).zip(top_edges) {
// This can't panic, as we passed `2` to `windows`. Can be
// cleaned up, once `array_windows` is stable.
let points = [points[0], points[1]];
// Can be cleaned up, once `zip` is stable:
// https://doc.rust-lang.org/std/primitive.array.html#method.zip
let [point_a, point_b] = points;
let [vertex_a, vertex_b] = edge.vertices().clone();
let vertices = [(point_a, vertex_a), (point_b, vertex_b)].map(
|(point, vertex)| {
let surface_form = SurfaceVertex::partial()
.with_position(Some(point))
.with_surface(Some(surface.clone()))
.with_global_form(Some(
vertex.global_form().clone(),
))
.build(self.stores);
Vertex::partial()
.with_position(Some(vertex.position()))
.with_surface_form(Some(surface_form))
},
);
edges.push(
HalfEdge::partial()
.with_vertices(Some(vertices))
.with_global_form(Some(edge.global_form().clone()))
.as_line_segment()
.build(self.stores),
);
}
Face::from_exterior(Cycle::new(surface, edges))
};
let mut faces = Vec::new();
faces.push(bottom);
faces.extend(sides);
faces.push(top);
Shell::new().with_faces(faces)
}
}