honeycomb_core/cmap/dim2/link_and_sew.rs
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//! (Un)sew and (un)link implementations
//!
//! This module contains code used to implement sew, unsew, link and unlink operations in all
//! dimensions for which they are defined (1, 2) for a [`CMap2`].
// ------ IMPORTS
use crate::prelude::{CMap2, DartIdType, NULL_DART_ID};
use crate::{
attributes::{AttributeStorage, UnknownAttributeStorage},
geometry::CoordsFloat,
};
use stm::{atomically, StmError, Transaction};
// ------ CONTENT
/// **Sew and unsew operations**
impl<T: CoordsFloat> CMap2<T> {
/// 1-sew operation.
///
/// This operation corresponds to *coherently linking* two darts via the *β<sub>1</sub>*
/// function. For a thorough explanation of this operation (and implied hypothesis &
/// consequences), refer to the [user guide][UG].
///
/// [UG]: https://lihpc-computational-geometry.github.io/honeycomb/
///
/// # Arguments
///
/// - `lhs_dart_id: DartIdentifier` -- ID of the first dart to be linked.
/// - `rhs_dart_id: DartIdentifier` -- ID of the second dart to be linked.
/// - `policy: SewPolicy` -- Geometrical sewing policy to follow.
///
/// After the sewing operation, these darts will verify
/// *β<sub>1</sub>(`lhs_dart`) = `rhs_dart`*. The *β<sub>0</sub>* function is also updated.
///
/// # Panics
///
/// The method may panic if the two darts are not 1-sewable.
///
pub fn one_sew(&self, lhs_dart_id: DartIdType, rhs_dart_id: DartIdType) {
// this operation only makes sense if lhs_dart is associated to a fully defined edge, i.e.
// its image through beta2 is defined & has a valid associated vertex (we assume the second
// condition is valid if the first one is)
// if that is not the case, the sewing operation becomes a linking operation
let b2lhs_dart_id = self.beta::<2>(lhs_dart_id);
if b2lhs_dart_id == NULL_DART_ID {
self.one_link(lhs_dart_id, rhs_dart_id);
} else {
// fetch vertices ID before topology update
let b2lhs_vid_old = self.vertex_id(b2lhs_dart_id);
let rhs_vid_old = self.vertex_id(rhs_dart_id);
// update the topology
self.one_link(lhs_dart_id, rhs_dart_id);
// merge vertices & attributes from the old IDs to the new one
// FIXME: VertexIdentifier should be cast to DartIdentifier
self.vertices
.merge(self.vertex_id(rhs_dart_id), b2lhs_vid_old, rhs_vid_old);
self.attributes.merge_vertex_attributes(
self.vertex_id(rhs_dart_id),
b2lhs_vid_old,
rhs_vid_old,
);
}
}
/// Atomically 1-sew two darts.
pub fn atomically_one_sew(&self, lhs_dart_id: DartIdType, rhs_dart_id: DartIdType) {
atomically(|trans| {
let b2lhs_dart_id = self.betas[(2, lhs_dart_id)].read(trans)?;
if b2lhs_dart_id == NULL_DART_ID {
self.one_link_core(trans, lhs_dart_id, rhs_dart_id)
} else {
let b2lhs_vid_old = self.vertex_id_transac(trans, b2lhs_dart_id)?;
let rhs_vid_old = self.vertex_id_transac(trans, rhs_dart_id)?;
self.one_link_core(trans, lhs_dart_id, rhs_dart_id)?;
let new_vid = self.vertex_id_transac(trans, rhs_dart_id)?;
// FIXME: VertexIdentifier should be cast to DartIdentifier
self.vertices
.merge_core(trans, new_vid, b2lhs_vid_old, rhs_vid_old)?;
self.attributes.merge_vertex_attributes_transac(
trans,
new_vid,
b2lhs_vid_old,
rhs_vid_old,
)?;
Ok(())
}
});
}
/// 2-sew operation.
///
/// This operation corresponds to *coherently linking* two darts via the *β<sub>2</sub>*
/// function. For a thorough explanation of this operation (and implied hypothesis &
/// consequences), refer to the [user guide][UG].
///
/// [UG]: https://lihpc-computational-geometry.github.io/honeycomb/
///
/// # Arguments
///
/// - `lhs_dart_id: DartIdentifier` -- ID of the first dart to be linked.
/// - `rhs_dart_id: DartIdentifier` -- ID of the second dart to be linked.
/// - `policy: SewPolicy` -- Geometrical sewing policy to follow.
///
/// After the sewing operation, these darts will verify
/// *β<sub>2</sub>(`lhs_dart`) = `rhs_dart`* and *β<sub>2</sub>(`rhs_dart`) = `lhs_dart`*.
///
/// # Panics
///
/// The method may panic if:
/// - the two darts are not 2-sewable,
/// - the method cannot resolve orientation issues.
///
pub fn two_sew(&self, lhs_dart_id: DartIdType, rhs_dart_id: DartIdType) {
let b1lhs_dart_id = self.beta::<1>(lhs_dart_id);
let b1rhs_dart_id = self.beta::<1>(rhs_dart_id);
// match (is lhs 1-free, is rhs 1-free)
match (b1lhs_dart_id == NULL_DART_ID, b1rhs_dart_id == NULL_DART_ID) {
// trivial case, no update needed
(true, true) => {
self.two_link(lhs_dart_id, rhs_dart_id);
}
// update vertex associated to b1rhs/lhs
(true, false) => {
// fetch vertices ID before topology update
let lhs_eid_old = self.edge_id(lhs_dart_id);
let rhs_eid_old = self.edge_id(b1rhs_dart_id);
let lhs_vid_old = self.vertex_id(lhs_dart_id);
let b1rhs_vid_old = self.vertex_id(b1rhs_dart_id);
// update the topology
self.two_link(lhs_dart_id, rhs_dart_id);
// merge vertices & attributes from the old IDs to the new one
// FIXME: VertexIdentifier should be cast to DartIdentifier
self.vertices
.merge(self.vertex_id(lhs_dart_id), lhs_vid_old, b1rhs_vid_old);
self.attributes.merge_vertex_attributes(
self.vertex_id(lhs_dart_id),
lhs_vid_old,
b1rhs_vid_old,
);
self.attributes.merge_edge_attributes(
self.edge_id(lhs_dart_id),
lhs_eid_old,
rhs_eid_old,
);
}
// update vertex associated to b1lhs/rhs
(false, true) => {
// fetch vertices ID before topology update
let lhs_eid_old = self.edge_id(lhs_dart_id);
let rhs_eid_old = self.edge_id(b1rhs_dart_id);
let b1lhs_vid_old = self.vertex_id(b1lhs_dart_id);
let rhs_vid_old = self.vertex_id(rhs_dart_id);
// update the topology
self.two_link(lhs_dart_id, rhs_dart_id);
// merge vertices & attributes from the old IDs to the new one
// FIXME: VertexIdentifier should be cast to DartIdentifier
self.vertices
.merge(self.vertex_id(rhs_dart_id), b1lhs_vid_old, rhs_vid_old);
self.attributes.merge_vertex_attributes(
self.vertex_id(rhs_dart_id),
b1lhs_vid_old,
rhs_vid_old,
);
self.attributes.merge_edge_attributes(
self.edge_id(lhs_dart_id),
lhs_eid_old,
rhs_eid_old,
);
}
// update both vertices making up the edge
(false, false) => {
// fetch vertices ID before topology update
let lhs_eid_old = self.edge_id(lhs_dart_id);
let rhs_eid_old = self.edge_id(b1rhs_dart_id);
// (lhs/b1rhs) vertex
let lhs_vid_old = self.vertex_id(lhs_dart_id);
let b1rhs_vid_old = self.vertex_id(b1rhs_dart_id);
// (b1lhs/rhs) vertex
let b1lhs_vid_old = self.vertex_id(b1lhs_dart_id);
let rhs_vid_old = self.vertex_id(rhs_dart_id);
// check orientation
// FIXME: using `get` is suboptimal because read ops imply a copy in our collections
// FIXME: maybe we should directly read into the storage instead of using its API
#[rustfmt::skip]
if let (
Some(l_vertex), Some(b1r_vertex), // (lhs/b1rhs) vertices
Some(b1l_vertex), Some(r_vertex), // (b1lhs/rhs) vertices
) = (
self.vertices.get(lhs_vid_old), self.vertices.get(b1rhs_vid_old),// (lhs/b1rhs)
self.vertices.get(b1lhs_vid_old), self.vertices.get(rhs_vid_old) // (b1lhs/rhs)
)
{
let lhs_vector = b1l_vertex - l_vertex;
let rhs_vector = b1r_vertex - r_vertex;
// dot product should be negative if the two darts have opposite direction
// we could also put restriction on the angle made by the two darts to prevent
// drastic deformation
// FIXME: should we crash in case of inconsistent orientation?
assert!(
lhs_vector.dot(&rhs_vector) < T::zero(),
"{}",
format!("Dart {lhs_dart_id} and {rhs_dart_id} do not have consistent orientation for 2-sewing"),
);
};
// update the topology
self.two_link(lhs_dart_id, rhs_dart_id);
// merge vertices & attributes from the old IDs to the new one
// FIXME: VertexIdentifier should be cast to DartIdentifier
self.vertices
.merge(self.vertex_id(lhs_dart_id), lhs_vid_old, b1rhs_vid_old);
self.vertices
.merge(self.vertex_id(rhs_dart_id), b1lhs_vid_old, rhs_vid_old);
self.attributes.merge_vertex_attributes(
self.vertex_id(lhs_dart_id),
lhs_vid_old,
b1rhs_vid_old,
);
self.attributes.merge_vertex_attributes(
self.vertex_id(rhs_dart_id),
b1lhs_vid_old,
rhs_vid_old,
);
self.attributes.merge_edge_attributes(
self.edge_id(lhs_dart_id),
lhs_eid_old,
rhs_eid_old,
);
}
}
}
#[allow(clippy::missing_panics_doc)]
/// Atomically 2-sew two darts.
#[allow(clippy::too_many_lines)]
pub fn atomically_two_sew(&self, lhs_dart_id: DartIdType, rhs_dart_id: DartIdType) {
atomically(|trans| {
let b1lhs_dart_id = self.betas[(1, lhs_dart_id)].read(trans)?;
let b1rhs_dart_id = self.betas[(1, rhs_dart_id)].read(trans)?;
// match (is lhs 1-free, is rhs 1-free)
match (b1lhs_dart_id == NULL_DART_ID, b1rhs_dart_id == NULL_DART_ID) {
// trivial case, no update needed
(true, true) => {
self.two_link_core(trans, lhs_dart_id, rhs_dart_id)?;
}
// update vertex associated to b1rhs/lhs
(true, false) => {
// fetch vertices ID before topology update
let lhs_eid_old = self.edge_id_transac(trans, lhs_dart_id)?;
let rhs_eid_old = self.edge_id_transac(trans, b1rhs_dart_id)?;
let lhs_vid_old = self.vertex_id_transac(trans, lhs_dart_id)?;
let b1rhs_vid_old = self.vertex_id_transac(trans, b1rhs_dart_id)?;
// update the topology
self.two_link_core(trans, lhs_dart_id, rhs_dart_id)?;
// merge vertices & attributes from the old IDs to the new one
// FIXME: VertexIdentifier should be cast to DartIdentifier
let lhs_vid_new = self.vertex_id_transac(trans, lhs_dart_id)?;
let eid_new = self.edge_id_transac(trans, lhs_dart_id)?;
self.vertices
.merge_core(trans, lhs_vid_new, lhs_vid_old, b1rhs_vid_old)?;
self.attributes.merge_vertex_attributes_transac(
trans,
lhs_vid_new,
lhs_vid_old,
b1rhs_vid_old,
)?;
self.attributes.merge_edge_attributes_transac(
trans,
eid_new,
lhs_eid_old,
rhs_eid_old,
)?;
}
// update vertex associated to b1lhs/rhs
(false, true) => {
// fetch vertices ID before topology update
let lhs_eid_old = self.edge_id_transac(trans, lhs_dart_id)?;
let rhs_eid_old = self.edge_id_transac(trans, b1rhs_dart_id)?;
let b1lhs_vid_old = self.vertex_id_transac(trans, b1lhs_dart_id)?;
let rhs_vid_old = self.vertex_id_transac(trans, rhs_dart_id)?;
// update the topology
self.two_link_core(trans, lhs_dart_id, rhs_dart_id)?;
// merge vertices & attributes from the old IDs to the new one
let rhs_vid_new = self.vertex_id_transac(trans, rhs_dart_id)?;
let eid_new = self.edge_id_transac(trans, lhs_dart_id)?;
self.vertices
.merge_core(trans, rhs_vid_new, b1lhs_vid_old, rhs_vid_old)?;
self.attributes.merge_vertex_attributes_transac(
trans,
rhs_vid_new,
b1lhs_vid_old,
rhs_vid_old,
)?;
self.attributes.merge_edge_attributes_transac(
trans,
eid_new,
lhs_eid_old,
rhs_eid_old,
)?;
}
// update both vertices making up the edge
(false, false) => {
// fetch vertices ID before topology update
let lhs_eid_old = self.edge_id_transac(trans, lhs_dart_id)?;
let rhs_eid_old = self.edge_id_transac(trans, b1rhs_dart_id)?;
// (lhs/b1rhs) vertex
let lhs_vid_old = self.vertex_id_transac(trans, lhs_dart_id)?;
let b1rhs_vid_old = self.vertex_id_transac(trans, b1rhs_dart_id)?;
// (b1lhs/rhs) vertex
let b1lhs_vid_old = self.vertex_id_transac(trans, b1lhs_dart_id)?;
let rhs_vid_old = self.vertex_id_transac(trans, rhs_dart_id)?;
// check orientation
#[rustfmt::skip]
if let (
Some(l_vertex), Some(b1r_vertex), // (lhs/b1rhs) vertices
Some(b1l_vertex), Some(r_vertex), // (b1lhs/rhs) vertices
) = (
self.vertices.get(lhs_vid_old), self.vertices.get(b1rhs_vid_old),// (lhs/b1rhs)
self.vertices.get(b1lhs_vid_old), self.vertices.get(rhs_vid_old) // (b1lhs/rhs)
)
{
let lhs_vector = b1l_vertex - l_vertex;
let rhs_vector = b1r_vertex - r_vertex;
// dot product should be negative if the two darts have opposite direction
// we could also put restriction on the angle made by the two darts to prevent
// drastic deformation
assert!(
lhs_vector.dot(&rhs_vector) < T::zero(),
"{}",
format!("Dart {lhs_dart_id} and {rhs_dart_id} do not have consistent orientation for 2-sewing"),
);
};
// update the topology
self.two_link_core(trans, lhs_dart_id, rhs_dart_id)?;
// merge vertices & attributes from the old IDs to the new one
// FIXME: VertexIdentifier should be cast to DartIdentifier
let lhs_vid_new = self.vertex_id_transac(trans, lhs_dart_id)?;
let rhs_vid_new = self.vertex_id_transac(trans, rhs_dart_id)?;
let eid_new = self.edge_id_transac(trans, lhs_dart_id)?;
self.vertices
.merge_core(trans, lhs_vid_new, lhs_vid_old, b1rhs_vid_old)?;
self.vertices
.merge_core(trans, rhs_vid_new, b1lhs_vid_old, rhs_vid_old)?;
self.attributes.merge_vertex_attributes_transac(
trans,
lhs_vid_new,
lhs_vid_old,
b1rhs_vid_old,
)?;
self.attributes.merge_vertex_attributes_transac(
trans,
rhs_vid_new,
b1lhs_vid_old,
rhs_vid_old,
)?;
self.attributes.merge_edge_attributes_transac(
trans,
eid_new,
lhs_eid_old,
rhs_eid_old,
)?;
}
}
Ok(())
});
}
/// 1-unsew operation.
///
/// This operation corresponds to *coherently separating* two darts linked via the
/// *β<sub>1</sub>* function. For a thorough explanation of this operation (and implied
/// hypothesis & consequences), refer to the [user guide][UG].
///
/// [UG]: https://lihpc-computational-geometry.github.io/honeycomb/
///
/// # Arguments
///
/// - `lhs_dart_id: DartIdentifier` -- ID of the dart to separate.
/// - `policy: UnsewPolicy` -- Geometrical unsewing policy to follow.
///
/// Note that we do not need to take two darts as arguments since the second dart can be
/// obtained through the *β<sub>1</sub>* function. The *β<sub>0</sub>* function is also updated.
///
/// # Panics
///
/// The method may panic if there's a missing attribute at the splitting step. While the
/// implementation could fall back to a simple unlink operation, it probably should have been
/// called by the user, instead of unsew, in the first place.
pub fn one_unsew(&self, lhs_dart_id: DartIdType) {
let b2lhs_dart_id = self.beta::<2>(lhs_dart_id);
if b2lhs_dart_id == NULL_DART_ID {
self.one_unlink(lhs_dart_id);
} else {
// fetch IDs before topology update
let rhs_dart_id = self.beta::<1>(lhs_dart_id);
let vid_old = self.vertex_id(rhs_dart_id);
// update the topology
self.one_unlink(lhs_dart_id);
// split vertices & attributes from the old ID to the new ones
// FIXME: VertexIdentifier should be cast to DartIdentifier
self.vertices.split(
self.vertex_id(b2lhs_dart_id),
self.vertex_id(rhs_dart_id),
vid_old,
);
self.attributes.split_vertex_attributes(
self.vertex_id(b2lhs_dart_id),
self.vertex_id(rhs_dart_id),
vid_old,
);
}
}
/// Atomically 1-unsew two darts.
pub fn atomically_one_unsew(&self, lhs_dart_id: DartIdType) {
atomically(|trans| {
let b2lhs_dart_id = self.betas[(2, lhs_dart_id)].read(trans)?;
if b2lhs_dart_id == NULL_DART_ID {
self.one_unlink_core(trans, lhs_dart_id)?;
} else {
// fetch IDs before topology update
let rhs_dart_id = self.betas[(1, lhs_dart_id)].read(trans)?;
let vid_old = self.vertex_id_transac(trans, rhs_dart_id)?;
// update the topology
self.one_unlink_core(trans, lhs_dart_id)?;
// split vertices & attributes from the old ID to the new ones
// FIXME: VertexIdentifier should be cast to DartIdentifier
let (new_lhs, new_rhs) = (
self.vertex_id_transac(trans, b2lhs_dart_id)?,
self.vertex_id_transac(trans, rhs_dart_id)?,
);
self.vertices.split_core(trans, new_lhs, new_rhs, vid_old)?;
self.attributes
.split_vertex_attributes_transac(trans, new_lhs, new_rhs, vid_old)?;
}
Ok(())
});
}
/// 2-unsew operation.
///
/// This operation corresponds to *coherently separating* two darts linked via the
/// *β<sub>2</sub>* function. For a thorough explanation of this operation (and implied
/// hypothesis & consequences), refer to the [user guide][UG].
///
/// [UG]: https://lihpc-computational-geometry.github.io/honeycomb/
///
/// # Arguments
///
/// - `lhs_dart_id: DartIdentifier` -- ID of the dart to separate.
/// - `policy: UnsewPolicy` -- Geometrical unsewing policy to follow.
///
/// Note that we do not need to take two darts as arguments since the second dart can be
/// obtained through the *β<sub>2</sub>* function.
///
/// # Panics
///
/// The method may panic if there's a missing attribute at the splitting step. While the
/// implementation could fall back to a simple unlink operation, it probably should have been
/// called by the user, instead of unsew, in the first place.
pub fn two_unsew(&self, lhs_dart_id: DartIdType) {
let rhs_dart_id = self.beta::<2>(lhs_dart_id);
let b1lhs_dart_id = self.beta::<1>(lhs_dart_id);
let b1rhs_dart_id = self.beta::<1>(rhs_dart_id);
// match (is lhs 1-free, is rhs 1-free)
match (b1lhs_dart_id == NULL_DART_ID, b1rhs_dart_id == NULL_DART_ID) {
(true, true) => {
// fetch IDs before topology update
let eid_old = self.edge_id(lhs_dart_id);
// update the topology
self.two_unlink(lhs_dart_id);
// split attributes from the old ID to the new ones
// FIXME: VertexIdentifier should be cast to DartIdentifier
self.attributes
.split_edge_attributes(lhs_dart_id, rhs_dart_id, eid_old);
}
(true, false) => {
// fetch IDs before topology update
let eid_old = self.edge_id(lhs_dart_id);
let lhs_vid_old = self.vertex_id(lhs_dart_id);
// update the topology
self.two_unlink(lhs_dart_id);
// split vertex & attributes from the old ID to the new ones
// FIXME: VertexIdentifier should be cast to DartIdentifier
self.attributes
.split_edge_attributes(lhs_dart_id, rhs_dart_id, eid_old);
let (new_lv_lhs, new_lv_rhs) =
(self.vertex_id(lhs_dart_id), self.vertex_id(b1rhs_dart_id));
self.attributes
.split_vertex_attributes(new_lv_lhs, new_lv_rhs, lhs_vid_old);
}
(false, true) => {
// fetch IDs before topology update
let eid_old = self.edge_id(lhs_dart_id);
let rhs_vid_old = self.vertex_id(rhs_dart_id);
// update the topology
self.two_unlink(lhs_dart_id);
// split vertex & attributes from the old ID to the new ones
// FIXME: VertexIdentifier should be cast to DartIdentifier
self.attributes
.split_edge_attributes(lhs_dart_id, rhs_dart_id, eid_old);
let (new_rv_lhs, new_rv_rhs) =
(self.vertex_id(b1lhs_dart_id), self.vertex_id(rhs_dart_id));
self.attributes
.split_vertex_attributes(new_rv_lhs, new_rv_rhs, rhs_vid_old);
}
(false, false) => {
// fetch IDs before topology update
let eid_old = self.edge_id(lhs_dart_id);
let lhs_vid_old = self.vertex_id(lhs_dart_id);
let rhs_vid_old = self.vertex_id(rhs_dart_id);
// update the topology
self.two_unlink(lhs_dart_id);
// split vertices & attributes from the old ID to the new ones
// FIXME: VertexIdentifier should be cast to DartIdentifier
self.attributes
.split_edge_attributes(lhs_dart_id, rhs_dart_id, eid_old);
let (new_lv_lhs, new_lv_rhs) =
(self.vertex_id(lhs_dart_id), self.vertex_id(b1rhs_dart_id));
let (new_rv_lhs, new_rv_rhs) =
(self.vertex_id(b1lhs_dart_id), self.vertex_id(rhs_dart_id));
self.attributes
.split_vertex_attributes(new_lv_lhs, new_lv_rhs, lhs_vid_old);
self.attributes
.split_vertex_attributes(new_rv_lhs, new_rv_rhs, rhs_vid_old);
}
}
}
/// Atomically 2-unsew two darts.
pub fn atomically_two_unsew(&self, lhs_dart_id: DartIdType) {
atomically(|trans| {
let rhs_dart_id = self.betas[(2, lhs_dart_id)].read(trans)?;
let b1lhs_dart_id = self.betas[(1, lhs_dart_id)].read(trans)?;
let b1rhs_dart_id = self.betas[(1, rhs_dart_id)].read(trans)?;
// match (is lhs 1-free, is rhs 1-free)
match (b1lhs_dart_id == NULL_DART_ID, b1rhs_dart_id == NULL_DART_ID) {
(true, true) => {
// fetch IDs before topology update
let eid_old = self.edge_id_transac(trans, lhs_dart_id)?;
// update the topology
self.two_unlink_core(trans, lhs_dart_id)?;
// split attributes from the old ID to the new ones
// FIXME: VertexIdentifier should be cast to DartIdentifier
self.attributes.split_edge_attributes_transac(
trans,
lhs_dart_id,
rhs_dart_id,
eid_old,
)?;
}
(true, false) => {
// fetch IDs before topology update
let eid_old = self.edge_id_transac(trans, lhs_dart_id)?;
let lhs_vid_old = self.vertex_id_transac(trans, lhs_dart_id)?;
// update the topology
self.two_unlink_core(trans, lhs_dart_id)?;
// split vertex & attributes from the old ID to the new ones
// FIXME: VertexIdentifier should be cast to DartIdentifier
self.attributes.split_edge_attributes_transac(
trans,
lhs_dart_id,
rhs_dart_id,
eid_old,
)?;
let (new_lv_lhs, new_lv_rhs) = (
self.vertex_id_transac(trans, lhs_dart_id)?,
self.vertex_id_transac(trans, b1rhs_dart_id)?,
);
self.attributes.split_vertex_attributes_transac(
trans,
new_lv_lhs,
new_lv_rhs,
lhs_vid_old,
)?;
}
(false, true) => {
// fetch IDs before topology update
let eid_old = self.edge_id_transac(trans, lhs_dart_id)?;
let rhs_vid_old = self.vertex_id_transac(trans, rhs_dart_id)?;
// update the topology
self.two_unlink_core(trans, lhs_dart_id)?;
// split vertex & attributes from the old ID to the new ones
// FIXME: VertexIdentifier should be cast to DartIdentifier
self.attributes.split_edge_attributes_transac(
trans,
lhs_dart_id,
rhs_dart_id,
eid_old,
)?;
let (new_rv_lhs, new_rv_rhs) = (
self.vertex_id_transac(trans, b1lhs_dart_id)?,
self.vertex_id_transac(trans, rhs_dart_id)?,
);
self.attributes.split_vertex_attributes_transac(
trans,
new_rv_lhs,
new_rv_rhs,
rhs_vid_old,
)?;
}
(false, false) => {
// fetch IDs before topology update
let eid_old = self.edge_id_transac(trans, lhs_dart_id)?;
let lhs_vid_old = self.vertex_id_transac(trans, lhs_dart_id)?;
let rhs_vid_old = self.vertex_id_transac(trans, rhs_dart_id)?;
// update the topology
self.two_unlink_core(trans, lhs_dart_id)?;
// split vertices & attributes from the old ID to the new ones
// FIXME: VertexIdentifier should be cast to DartIdentifier
self.attributes.split_edge_attributes_transac(
trans,
lhs_dart_id,
rhs_dart_id,
eid_old,
)?;
let (new_lv_lhs, new_lv_rhs) = (
self.vertex_id_transac(trans, lhs_dart_id)?,
self.vertex_id_transac(trans, b1rhs_dart_id)?,
);
let (new_rv_lhs, new_rv_rhs) = (
self.vertex_id_transac(trans, b1lhs_dart_id)?,
self.vertex_id_transac(trans, rhs_dart_id)?,
);
self.attributes.split_vertex_attributes_transac(
trans,
new_lv_lhs,
new_lv_rhs,
lhs_vid_old,
)?;
self.attributes.split_vertex_attributes_transac(
trans,
new_rv_lhs,
new_rv_rhs,
rhs_vid_old,
)?;
}
}
Ok(())
});
}
}
/// **Link and unlink operations**
impl<T: CoordsFloat> CMap2<T> {
/// 1-link operation.
///
/// This operation corresponds to linking two darts via the *β<sub>1</sub>* function. Unlike
/// its sewing counterpart, this method does not contain any code to update the attributes or
/// geometrical data of the affected cell(s). The *β<sub>0</sub>* function is also updated.
///
/// # Arguments
///
/// - `lhs_dart_id: DartIdentifier` -- ID of the first dart to be linked.
/// - `rhs_dart_id: DartIdentifier` -- ID of the second dart to be linked.
///
/// # Panics
///
/// This method may panic if `lhs_dart_id` isn't 1-free or `rhs_dart_id` isn't 0-free.
///
pub fn one_link(&self, lhs_dart_id: DartIdType, rhs_dart_id: DartIdType) {
atomically(|trans| self.one_link_core(trans, lhs_dart_id, rhs_dart_id));
}
/// 2-link operation.
///
/// This operation corresponds to linking two darts via the *β<sub>2</sub>* function. Unlike
/// its sewing counterpart, this method does not contain any code to update the attributes or
/// geometrical data of the affected cell(s).
///
/// # Arguments
///
/// - `lhs_dart_id: DartIdentifier` -- ID of the first dart to be linked.
/// - `rhs_dart_id: DartIdentifier` -- ID of the second dart to be linked.
///
/// # Panics
///
/// This method may panic if one of `lhs_dart_id` or `rhs_dart_id` isn't 2-free.
pub fn two_link(&self, lhs_dart_id: DartIdType, rhs_dart_id: DartIdType) {
atomically(|trans| self.two_link_core(trans, lhs_dart_id, rhs_dart_id));
}
/// 1-unlink operation.
///
/// This operation corresponds to unlinking two darts that are linked via the *β<sub>1</sub>*
/// function. Unlike its sewing counterpart, this method does not contain any code to update
/// the attributes or geometrical data of the affected cell(s). The *β<sub>0</sub>* function is
/// also updated.
///
/// # Arguments
///
/// - `lhs_dart_id: DartIdentifier` -- ID of the dart to unlink.
///
/// # Panics
///
/// This method may panic if one of `lhs_dart_id` is already 1-free.
pub fn one_unlink(&self, lhs_dart_id: DartIdType) {
atomically(|trans| self.one_unlink_core(trans, lhs_dart_id));
}
/// 2-unlink operation.
///
/// This operation corresponds to unlinking two darts that are linked via the *β<sub>2</sub>*
/// function. Unlike its sewing counterpart, this method does not contain any code to update
/// the attributes or geometrical data of the affected cell(s).
///
/// # Arguments
///
/// - `lhs_dart_id: DartIdentifier` -- ID of the dart to unlink.
///
/// # Panics
///
/// This method may panic if one of `lhs_dart_id` is already 2-free.
pub fn two_unlink(&self, lhs_dart_id: DartIdType) {
atomically(|trans| self.two_unlink_core(trans, lhs_dart_id));
}
}
#[doc(hidden)]
/// **Link and unlink core operations**
impl<T: CoordsFloat> CMap2<T> {
/// 1-link operation.
///
/// This operation corresponds to linking two darts via the *β<sub>1</sub>* function. Unlike
/// its sewing counterpart, this method does not contain any code to update the attributes or
/// geometrical data of the affected cell(s). The *β<sub>0</sub>* function is also updated.
///
/// # Arguments
///
/// - `lhs_dart_id: DartIdentifier` -- ID of the first dart to be linked.
/// - `rhs_dart_id: DartIdentifier` -- ID of the second dart to be linked.
///
/// # Panics
///
/// This method may panic if `lhs_dart_id` isn't 1-free or `rhs_dart_id` isn't 0-free.
///
pub(crate) fn one_link_core(
&self,
trans: &mut Transaction,
lhs_dart_id: DartIdType,
rhs_dart_id: DartIdType,
) -> Result<(), StmError> {
// we could technically overwrite the value, but these assertions
// makes it easier to assert algorithm correctness
assert!(self.is_i_free::<1>(lhs_dart_id));
assert!(self.is_i_free::<0>(rhs_dart_id));
// set beta_1(lhs_dart) to rhs_dart
self.betas[(1, lhs_dart_id)].write(trans, rhs_dart_id)?;
// set beta_0(rhs_dart) to lhs_dart
self.betas[(0, rhs_dart_id)].write(trans, lhs_dart_id)?;
Ok(())
}
/// 2-link operation.
///
/// This operation corresponds to linking two darts via the *β<sub>2</sub>* function. Unlike
/// its sewing counterpart, this method does not contain any code to update the attributes or
/// geometrical data of the affected cell(s).
///
/// # Arguments
///
/// - `lhs_dart_id: DartIdentifier` -- ID of the first dart to be linked.
/// - `rhs_dart_id: DartIdentifier` -- ID of the second dart to be linked.
///
/// # Panics
///
/// This method may panic if one of `lhs_dart_id` or `rhs_dart_id` isn't 2-free.
pub(crate) fn two_link_core(
&self,
trans: &mut Transaction,
lhs_dart_id: DartIdType,
rhs_dart_id: DartIdType,
) -> Result<(), StmError> {
// we could technically overwrite the value, but these assertions
// make it easier to assert algorithm correctness
assert!(self.is_i_free::<2>(lhs_dart_id));
assert!(self.is_i_free::<2>(rhs_dart_id));
// set beta_2(lhs_dart) to rhs_dart
self.betas[(2, lhs_dart_id)].write(trans, rhs_dart_id)?;
// set beta_2(rhs_dart) to lhs_dart
self.betas[(2, rhs_dart_id)].write(trans, lhs_dart_id)?;
Ok(())
}
/// 1-unlink operation.
///
/// This operation corresponds to unlinking two darts that are linked via the *β<sub>1</sub>*
/// function. Unlike its sewing counterpart, this method does not contain any code to update
/// the attributes or geometrical data of the affected cell(s). The *β<sub>0</sub>* function is
/// also updated.
///
/// # Arguments
///
/// - `lhs_dart_id: DartIdentifier` -- ID of the dart to unlink.
///
/// # Panics
///
/// This method may panic if one of `lhs_dart_id` is already 1-free.
pub(crate) fn one_unlink_core(
&self,
trans: &mut Transaction,
lhs_dart_id: DartIdType,
) -> Result<(), StmError> {
// set beta_1(lhs_dart) to NullDart
let rhs_dart_id = self.betas[(1, lhs_dart_id)].replace(trans, NULL_DART_ID)?;
assert_ne!(rhs_dart_id, NULL_DART_ID);
// set beta_0(rhs_dart) to NullDart
self.betas[(0, rhs_dart_id)].write(trans, NULL_DART_ID)?;
Ok(())
}
/// 2-unlink operation.
///
/// This operation corresponds to unlinking two darts that are linked via the *β<sub>2</sub>*
/// function. Unlike its sewing counterpart, this method does not contain any code to update
/// the attributes or geometrical data of the affected cell(s).
///
/// # Arguments
///
/// - `lhs_dart_id: DartIdentifier` -- ID of the dart to unlink.
///
/// # Panics
///
/// This method may panic if one of `lhs_dart_id` is already 2-free.
pub(crate) fn two_unlink_core(
&self,
trans: &mut Transaction,
lhs_dart_id: DartIdType,
) -> Result<(), StmError> {
// set beta_2(dart) to NullDart
let rhs_dart_id = self.betas[(2, lhs_dart_id)].replace(trans, NULL_DART_ID)?;
assert_ne!(rhs_dart_id, NULL_DART_ID);
// set beta_2(beta_2(dart)) to NullDart
self.betas[(2, rhs_dart_id)].write(trans, NULL_DART_ID)?;
Ok(())
}
}