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Don't disrupt lineage in split_face
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@hannobraun
hannobraun committed Feb 22, 2024
1 parent 7911d70 commit 444a057
Showing 1 changed file with 109 additions and 74 deletions.
183 changes: 109 additions & 74 deletions crates/fj-core/src/operations/split/face.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,9 +3,9 @@ use fj_math::Point;
use itertools::Itertools;

use crate::{
objects::{Face, HalfEdge, Shell},
objects::{Cycle, Face, HalfEdge, Shell},
operations::{
build::{BuildFace, BuildHalfEdge},
build::{BuildCycle, BuildHalfEdge},
derive::DeriveFrom,
insert::Insert,
presentation::SetColor,
Expand Down Expand Up @@ -125,86 +125,80 @@ impl SplitFace for Shell {

let half_edges_b_to_c_inclusive = half_edges_of_face_starting_at_b
.take_while_ref(|half_edge| half_edge != &d);
let split_face_a = Face::unbound(
updated_face_after_split_edges.surface().clone(),
core,
)
.update_region(
|region, core| {
let mut region = region
.update_exterior(
|cycle, core| {
cycle
.add_half_edges(
half_edges_b_to_c_inclusive,
core,
)
.add_half_edges(
[dividing_half_edge_c_to_b],
core,
)
},
core,
)
.insert(core)
.derive_from(region, core);

if let Some(color) = face.region().color() {
region = region
.set_color(color, core)
let split_face_a = updated_face_after_split_edges
.update_region(
|region, core| {
let mut region = region
.update_exterior(
|_, core| {
Cycle::empty()
.add_half_edges(
half_edges_b_to_c_inclusive,
core,
)
.add_half_edges(
[dividing_half_edge_c_to_b],
core,
)
},
core,
)
.insert(core)
.derive_from(&region, core);
}

region
},
core,
)
.insert(core)
.derive_from(updated_face_after_split_edges, core);
.derive_from(region, core);

if let Some(color) = face.region().color() {
region = region
.set_color(color, core)
.insert(core)
.derive_from(&region, core);
}

region
},
core,
)
.insert(core)
.derive_from(updated_face_after_split_edges, core);

// The previous operation has moved the iterator along.
let half_edges_of_face_starting_at_d = half_edges_of_face_starting_at_b;

let half_edges_d_to_a_inclusive = half_edges_of_face_starting_at_d
.take_while(|half_edge| half_edge != &b);
let split_face_b = Face::unbound(
updated_face_after_split_edges.surface().clone(),
core,
)
.update_region(
|region, core| {
let mut region = region
.update_exterior(
|cycle, core| {
cycle
.add_half_edges(
half_edges_d_to_a_inclusive,
core,
)
.add_half_edges(
[dividing_half_edge_a_to_d],
core,
)
},
core,
)
.insert(core)
.derive_from(region, core);

if let Some(color) = face.region().color() {
region = region
.set_color(color, core)
let split_face_b = updated_face_after_split_edges
.update_region(
|region, core| {
let mut region = region
.update_exterior(
|_, core| {
Cycle::empty()
.add_half_edges(
half_edges_d_to_a_inclusive,
core,
)
.add_half_edges(
[dividing_half_edge_a_to_d],
core,
)
},
core,
)
.insert(core)
.derive_from(&region, core);
}

region
},
core,
)
.insert(core)
.derive_from(updated_face_after_split_edges, core);
.derive_from(region, core);

if let Some(color) = face.region().color() {
region = region
.set_color(color, core)
.insert(core)
.derive_from(&region, core);
}

region
},
core,
)
.insert(core)
.derive_from(updated_face_after_split_edges, core);

let faces = [split_face_a, split_face_b];
let self_ = self_.update_face(
Expand All @@ -216,3 +210,44 @@ impl SplitFace for Shell {
(self_, faces)
}
}

#[cfg(test)]
mod tests {
use fj_interop::Color;

use crate::{
objects::Shell,
operations::{
build::BuildShell,
presentation::{GetColor, SetColor},
split::SplitFace,
},
Core,
};

#[test]
fn split_face_should_keep_color() {
let mut core = Core::new();

let tetrahedron = Shell::tetrahedron(
[[0., 0., 0.], [1., 0., 0.], [0., 1., 0.], [0., 0., 1.]],
&mut core,
);
let triangle = tetrahedron.abc;

let color = Color::default();
triangle.face.region().set_color(color, &mut core);

let split_line = [
(&triangle.half_edges[0], [0.5]),
(&triangle.half_edges[1], [0.5]),
];
let (_shell, [face_a, face_b]) =
tetrahedron
.shell
.split_face(&triangle.face, split_line, &mut core);

assert_eq!(face_a.region().get_color(&mut core), Some(color));
assert_eq!(face_b.region().get_color(&mut core), Some(color));
}
}

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