Handle "long" _struct_conn entries

src/mol-model/structure/model/formats/mmcif/bonds.ts

@@ -6,6 +6,7 @@
  */
 
 import Model from '../../model'
+import { Element } from '../../../structure'
 import { LinkType } from '../../types'
 import { findEntityIdByAsymId, findAtomIndexByLabelName } from './util'
 import { Column } from 'mol-data/db'
@@ -85,7 +86,7 @@ export namespace StructConn {
         distance: number,
         order: number,
         flags: number,
-        partners: { residueIndex: number, atomIndex: number, symmetry: string }[]
+        partners: { residueIndex: number, atomIndex: Element, symmetry: string }[]
     }
 
     type StructConnType =

src/mol-model/structure/model/formats/mmcif/util.ts

@@ -5,6 +5,7 @@
  */
 
 import Model from '../../model'
+import { Element } from '../../../structure'
 
 export function findEntityIdByAsymId(model: Model, asymId: string) {
     if (model.sourceData.kind !== 'mmCIF') return ''
@@ -15,12 +16,12 @@ export function findEntityIdByAsymId(model: Model, asymId: string) {
     return ''
 }
 
-export function findAtomIndexByLabelName(model: Model, residueIndex: number, atomName: string, altLoc: string | null) {
+export function findAtomIndexByLabelName(model: Model, residueIndex: number, atomName: string, altLoc: string | null): Element {
     const { segmentMap, segments } = model.atomicHierarchy.residueSegments
     const idx = segmentMap[residueIndex]
     const { label_atom_id, label_alt_id } = model.atomicHierarchy.atoms;
     for (let i = segments[idx], n = segments[idx + 1]; i <= n; ++i) {
-        if (label_atom_id.value(i) === atomName && (!altLoc || label_alt_id.value(i) === altLoc)) return i;
+        if (label_atom_id.value(i) === atomName && (!altLoc || label_alt_id.value(i) === altLoc)) return i as Element;
     }
-    return -1;
+    return -1 as Element;
 }
\ No newline at end of file

src/mol-model/structure/structure/unit/links/inter-compute.ts

@@ -11,6 +11,7 @@ import Unit from '../../unit';
 import { getElementIdx, getElementPairThreshold, getElementThreshold, isHydrogen, LinkComputationParameters, MetalsSet } from './common';
 import { InterUnitBonds } from './data';
 import { UniqueArray } from 'mol-data/generic';
+import { SortedArray } from 'mol-data/int';
 
 const MAX_RADIUS = 4;
 
@@ -57,6 +58,19 @@ function findPairLinks(unitA: Unit.Atomic, unitB: Unit.Atomic, params: LinkCompu
         const metalA = MetalsSet.has(aeI);
         const structConnEntries = params.forceCompute ? void 0 : structConn && structConn.getAtomEntries(aI);
 
+        if (structConnEntries) {
+            for (const se of structConnEntries) {
+                if (se.distance < MAX_RADIUS) continue;
+
+                for (const p of se.partners) {
+                    const _bI = SortedArray.indexOf(unitB.elements, p.atomIndex);
+                    if (_bI < 0) continue;
+                    addLink(_aI, _bI, se.order, se.flags, state);
+                    bondCount++;
+                }
+            }
+        }
+
         for (let ni = 0; ni < count; ni++) {
             const _bI = indices[ni];
             const bI = atomsB[_bI];

src/mol-model/structure/structure/unit/links/intra-compute.ts

@@ -10,6 +10,7 @@ import { StructConn, ComponentBond } from '../../../model/formats/mmcif/bonds'
 import Unit from '../../unit'
 import { IntAdjacencyGraph } from 'mol-math/graph';
 import { LinkComputationParameters, getElementIdx, MetalsSet, getElementThreshold, isHydrogen, getElementPairThreshold } from './common';
+import { SortedArray } from 'mol-data/int';
 
 function getGraph(atomA: number[], atomB: number[], _order: number[], _flags: number[], atomCount: number): IntraUnitLinks {
     const builder = new IntAdjacencyGraph.EdgeBuilder(atomCount, atomA, atomB);
@@ -70,6 +71,21 @@ function _computeBonds(unit: Unit.Atomic, params: LinkComputationParameters): In
         const metalA = MetalsSet.has(aeI);
         const structConnEntries = params.forceCompute ? void 0 : structConn && structConn.getAtomEntries(aI);
 
+        if (structConnEntries) {
+            for (const se of structConnEntries) {
+                if (se.distance < MAX_RADIUS) continue;
+
+                for (const p of se.partners) {
+                    const _bI = SortedArray.indexOf(unit.elements, p.atomIndex);
+                    if (_bI < 0) continue;
+                    atomA[atomA.length] = _aI;
+                    atomB[atomB.length] = _bI;
+                    flags[flags.length] = se.flags;
+                    order[order.length] = se.order;
+                }
+            }
+        }
+
         for (let ni = 0; ni < count; ni++) {
             const _bI = indices[ni];
             const bI = atoms[_bI];