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Merge pull request #311 from hannobraun/diff

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Clean up 2D difference code
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Hanno Braun 2022-03-08 17:23:10 +01:00 committed by GitHub
commit 9ec81bd97b
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1 changed files with 53 additions and 61 deletions
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60
src/kernel/shapes/difference_2d.rs
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@ -16,20 +16,11 @@ impl ToShape for fj::Difference2d {
let mut shape = Shape::new();
let mut a = self.a.to_shape(tolerance, debug_info);
let mut b = self.b.to_shape(tolerance, debug_info);
let [mut a, mut b] = [&self.a, &self.b]
.map(|shape| shape.to_shape(tolerance, debug_info));
if a.cycles().all().count() == 1 && b.cycles().all().count() == 1 {
let a = a.cycles().all().next().unwrap();
let b = b.cycles().all().next().unwrap();
shape.cycles().add(Cycle {
edges: a.edges.clone(),
});
shape.cycles().add(Cycle {
edges: b.edges.clone(),
});
} else {
for shape in [&mut a, &mut b] {
if shape.cycles().all().count() != 1 {
// See issue:
// https://github.com/hannobraun/Fornjot/issues/95
todo!(
@ -37,27 +28,32 @@ impl ToShape for fj::Difference2d {
cycle in each operand."
);
}
{
let (a, b) = if a.faces().all().count() == 1
&& b.faces().all().count() == 1
{
// Can't panic. We just checked that length of `a` and `b` is 1.
(
a.faces().all().next().unwrap(),
b.faces().all().next().unwrap(),
)
} else {
if shape.faces().all().count() != 1 {
// See issue:
// https://github.com/hannobraun/Fornjot/issues/95
todo!(
"The 2-dimensional difference operation only supports one \
face in each operand."
);
};
}
}
let (a, b, surface_a, surface_b) =
match ((*a).clone(), (*b).clone()) {
// Can't panic, as we just verified that both shapes have one cycle.
let cycles =
[&mut a, &mut b].map(|shape| shape.cycles().all().next().unwrap());
for cycle in cycles {
shape.cycles().add(Cycle {
edges: cycle.edges.clone(),
});
}
// Can't panic, as we just verified that both shapes have one face.
let [face_a, face_b] =
[&mut a, &mut b].map(|shape| shape.faces().all().next().unwrap());
let (cycles_a, cycles_b, surface_a, surface_b) =
match ((*face_a).clone(), (*face_b).clone()) {
(
Face::Face {
cycles: a,
@ -69,25 +65,21 @@ impl ToShape for fj::Difference2d {
},
) => (a, b, surface_a, surface_b),
_ => {
// None of the 2D types still use triangle
// representation.
// None of the 2D types still use triangle representation.
unreachable!()
}
};
assert!(
surface_a == surface_b,
// Panicking is not great, but as long as we don't have a real
// error handling mechanism, it will do.
"Trying to subtract sketches with different surfaces."
);
let surface = surface_a;
let mut cycles = a;
cycles.extend(b);
let mut cycles = cycles_a;
cycles.extend(cycles_b);
shape.faces().add(Face::Face { cycles, surface });
};
shape
}