honeycomb_core/cmap/dim2/sews/
one.rs

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1use crate::attributes::UnknownAttributeStorage;
2use crate::cmap::{CMap2, DartIdType, NULL_DART_ID, OrbitPolicy, SewError};
3use crate::geometry::CoordsFloat;
4use crate::stm::{Transaction, TransactionClosureResult, try_or_coerce};
5
6#[doc(hidden)]
7/// **1-(un)sews internals**
8impl<T: CoordsFloat> CMap2<T> {
9    /// 1-sew transactional implementation.
10    pub(super) fn one_sew(
11        &self,
12        trans: &mut Transaction,
13        lhs_dart_id: DartIdType,
14        rhs_dart_id: DartIdType,
15    ) -> TransactionClosureResult<(), SewError> {
16        let b2lhs_dart_id = self.betas[(2, lhs_dart_id)].read(trans)?;
17        if b2lhs_dart_id == NULL_DART_ID {
18            try_or_coerce!(
19                self.betas.one_link_core(trans, lhs_dart_id, rhs_dart_id),
20                SewError
21            );
22        } else {
23            let b2lhs_vid_old = self.vertex_id_transac(trans, b2lhs_dart_id)?;
24            let rhs_vid_old = self.vertex_id_transac(trans, rhs_dart_id)?;
25
26            try_or_coerce!(
27                self.betas.one_link_core(trans, lhs_dart_id, rhs_dart_id),
28                SewError
29            );
30
31            let new_vid = self.vertex_id_transac(trans, rhs_dart_id)?;
32
33            try_or_coerce!(
34                self.vertices
35                    .merge(trans, new_vid, b2lhs_vid_old, rhs_vid_old),
36                SewError
37            );
38            try_or_coerce!(
39                self.attributes.merge_attributes(
40                    trans,
41                    OrbitPolicy::Vertex,
42                    new_vid,
43                    b2lhs_vid_old,
44                    rhs_vid_old,
45                ),
46                SewError
47            );
48        }
49        Ok(())
50    }
51
52    /// 1-unsew transactional implementation.
53    pub(super) fn one_unsew(
54        &self,
55        trans: &mut Transaction,
56        lhs_dart_id: DartIdType,
57    ) -> TransactionClosureResult<(), SewError> {
58        let b2lhs_dart_id = self.betas[(2, lhs_dart_id)].read(trans)?;
59        if b2lhs_dart_id == NULL_DART_ID {
60            try_or_coerce!(self.betas.one_unlink_core(trans, lhs_dart_id), SewError);
61        } else {
62            // fetch IDs before topology update
63            let rhs_dart_id = self.betas[(1, lhs_dart_id)].read(trans)?;
64            let vid_old = self.vertex_id_transac(trans, rhs_dart_id)?;
65            // update the topology
66            try_or_coerce!(self.betas.one_unlink_core(trans, lhs_dart_id), SewError);
67            // split vertices & attributes from the old ID to the new ones
68            let (new_lhs, new_rhs) = (
69                self.vertex_id_transac(trans, b2lhs_dart_id)?,
70                self.vertex_id_transac(trans, rhs_dart_id)?,
71            );
72            try_or_coerce!(
73                self.vertices.split(trans, new_lhs, new_rhs, vid_old),
74                SewError
75            );
76            try_or_coerce!(
77                self.attributes.split_attributes(
78                    trans,
79                    OrbitPolicy::Vertex,
80                    new_lhs,
81                    new_rhs,
82                    vid_old
83                ),
84                SewError
85            );
86        }
87        Ok(())
88    }
89}
honeycomb_core/cmap/dim2/sews/one.rs

honeycomb_core/cmap/dim2/sews/
one.rs
