import {
BufferGeometry,
FileLoader,
Float32BufferAttribute,
Loader,
Color
} from 'three';
class PDBLoader extends Loader {
constructor( manager ) {
super( manager );
}
load( url, onLoad, onProgress, onError ) {
const scope = this;
const loader = new FileLoader( scope.manager );
loader.setPath( scope.path );
loader.setRequestHeader( scope.requestHeader );
loader.setWithCredentials( scope.withCredentials );
loader.load( url, function ( text ) {
try {
onLoad( scope.parse( text ) );
} catch ( e ) {
if ( onError ) {
onError( e );
} else {
console.error( e );
}
scope.manager.itemError( url );
}
}, onProgress, onError );
}
// Based on CanvasMol PDB parser
parse( text ) {
function trim( text ) {
return text.replace( /^\s\s*/, '' ).replace( /\s\s*$/, '' );
}
function capitalize( text ) {
return text.charAt( 0 ).toUpperCase() + text.slice( 1 ).toLowerCase();
}
function hash( s, e ) {
return 's' + Math.min( s, e ) + 'e' + Math.max( s, e );
}
function parseBond( start, length, satom, i ) {
const eatom = parseInt( lines[ i ].slice( start, start + length ) );
if ( eatom ) {
const h = hash( satom, eatom );
if ( _bhash[ h ] === undefined ) {
_bonds.push( [ satom - 1, eatom - 1, 1 ] );
_bhash[ h ] = _bonds.length - 1;
} else {
// doesn't really work as almost all PDBs
// have just normal bonds appearing multiple
// times instead of being double/triple bonds
// bonds[bhash[h]][2] += 1;
}
}
}
function buildGeometry() {
const build = {
geometryAtoms: new BufferGeometry(),
geometryBonds: new BufferGeometry(),
json: {
atoms: atoms
}
};
const geometryAtoms = build.geometryAtoms;
const geometryBonds = build.geometryBonds;
const verticesAtoms = [];
const colorsAtoms = [];
const verticesBonds = [];
// atoms
const c = new Color();
for ( let i = 0, l = atoms.length; i < l; i ++ ) {
const atom = atoms[ i ];
const x = atom[ 0 ];
const y = atom[ 1 ];
const z = atom[ 2 ];
verticesAtoms.push( x, y, z );
const r = atom[ 3 ][ 0 ] / 255;
const g = atom[ 3 ][ 1 ] / 255;
const b = atom[ 3 ][ 2 ] / 255;
c.set( r, g, b ).convertSRGBToLinear();
colorsAtoms.push( c.r, c.g, c.b );
}
// bonds
for ( let i = 0, l = _bonds.length; i < l; i ++ ) {
const bond = _bonds[ i ];
const start = bond[ 0 ];
const end = bond[ 1 ];
const startAtom = _atomMap[ start ];
const endAtom = _atomMap[ end ];
let x = startAtom[ 0 ];
let y = startAtom[ 1 ];
let z = startAtom[ 2 ];
verticesBonds.push( x, y, z );
x = endAtom[ 0 ];
y = endAtom[ 1 ];
z = endAtom[ 2 ];
verticesBonds.push( x, y, z );
}
// build geometry
geometryAtoms.setAttribute( 'position', new Float32BufferAttribute( verticesAtoms, 3 ) );
geometryAtoms.setAttribute( 'color', new Float32BufferAttribute( colorsAtoms, 3 ) );
geometryBonds.setAttribute( 'position', new Float32BufferAttribute( verticesBonds, 3 ) );
return build;
}
const CPK = { h: [ 255, 255, 255 ], he: [ 217, 255, 255 ], li: [ 204, 128, 255 ], be: [ 194, 255, 0 ], b: [ 255, 181, 181 ], c: [ 144, 144, 144 ], n: [ 48, 80, 248 ], o: [ 255, 13, 13 ], f: [ 144, 224, 80 ], ne: [ 179, 227, 245 ], na: [ 171, 92, 242 ], mg: [ 138, 255, 0 ], al: [ 191, 166, 166 ], si: [ 240, 200, 160 ], p: [ 255, 128, 0 ], s: [ 255, 255, 48 ], cl: [ 31, 240, 31 ], ar: [ 128, 209, 227 ], k: [ 143, 64, 212 ], ca: [ 61, 255, 0 ], sc: [ 230, 230, 230 ], ti: [ 191, 194, 199 ], v: [ 166, 166, 171 ], cr: [ 138, 153, 199 ], mn: [ 156, 122, 199 ], fe: [ 224, 102, 51 ], co: [ 240, 144, 160 ], ni: [ 80, 208, 80 ], cu: [ 200, 128, 51 ], zn: [ 125, 128, 176 ], ga: [ 194, 143, 143 ], ge: [ 102, 143, 143 ], as: [ 189, 128, 227 ], se: [ 255, 161, 0 ], br: [ 166, 41, 41 ], kr: [ 92, 184, 209 ], rb: [ 112, 46, 176 ], sr: [ 0, 255, 0 ], y: [ 148, 255, 255 ], zr: [ 148, 224, 224 ], nb: [ 115, 194, 201 ], mo: [ 84, 181, 181 ], tc: [ 59, 158, 158 ], ru: [ 36, 143, 143 ], rh: [ 10, 125, 140 ], pd: [ 0, 105, 133 ], ag: [ 192, 192, 192 ], cd: [ 255, 217, 143 ], in: [ 166, 117, 115 ], sn: [ 102, 128, 128 ], sb: [ 158, 99, 181 ], te: [ 212, 122, 0 ], i: [ 148, 0, 148 ], xe: [ 66, 158, 176 ], cs: [ 87, 23, 143 ], ba: [ 0, 201, 0 ], la: [ 112, 212, 255 ], ce: [ 255, 255, 199 ], pr: [ 217, 255, 199 ], nd: [ 199, 255, 199 ], pm: [ 163, 255, 199 ], sm: [ 143, 255, 199 ], eu: [ 97, 255, 199 ], gd: [ 69, 255, 199 ], tb: [ 48, 255, 199 ], dy: [ 31, 255, 199 ], ho: [ 0, 255, 156 ], er: [ 0, 230, 117 ], tm: [ 0, 212, 82 ], yb: [ 0, 191, 56 ], lu: [ 0, 171, 36 ], hf: [ 77, 194, 255 ], ta: [ 77, 166, 255 ], w: [ 33, 148, 214 ], re: [ 38, 125, 171 ], os: [ 38, 102, 150 ], ir: [ 23, 84, 135 ], pt: [ 208, 208, 224 ], au: [ 255, 209, 35 ], hg: [ 184, 184, 208 ], tl: [ 166, 84, 77 ], pb: [ 87, 89, 97 ], bi: [ 158, 79, 181 ], po: [ 171, 92, 0 ], at: [ 117, 79, 69 ], rn: [ 66, 130, 150 ], fr: [ 66, 0, 102 ], ra: [ 0, 125, 0 ], ac: [ 112, 171, 250 ], th: [ 0, 186, 255 ], pa: [ 0, 161, 255 ], u: [ 0, 143, 255 ], np: [ 0, 128, 255 ], pu: [ 0, 107, 255 ], am: [ 84, 92, 242 ], cm: [ 120, 92, 227 ], bk: [ 138, 79, 227 ], cf: [ 161, 54, 212 ], es: [ 179, 31, 212 ], fm: [ 179, 31, 186 ], md: [ 179, 13, 166 ], no: [ 189, 13, 135 ], lr: [ 199, 0, 102 ], rf: [ 204, 0, 89 ], db: [ 209, 0, 79 ], sg: [ 217, 0, 69 ], bh: [ 224, 0, 56 ], hs: [ 230, 0, 46 ], mt: [ 235, 0, 38 ], ds: [ 235, 0, 38 ], rg: [ 235, 0, 38 ], cn: [ 235, 0, 38 ], uut: [ 235, 0, 38 ], uuq: [ 235, 0, 38 ], uup: [ 235, 0, 38 ], uuh: [ 235, 0, 38 ], uus: [ 235, 0, 38 ], uuo: [ 235, 0, 38 ] };
const atoms = [];
const _bonds = [];
const _bhash = {};
const _atomMap = {};
// parse
const lines = text.split( '\n' );
for ( let i = 0, l = lines.length; i < l; i ++ ) {
if ( lines[ i ].slice( 0, 4 ) === 'ATOM' || lines[ i ].slice( 0, 6 ) === 'HETATM' ) {
const x = parseFloat( lines[ i ].slice( 30, 37 ) );
const y = parseFloat( lines[ i ].slice( 38, 45 ) );
const z = parseFloat( lines[ i ].slice( 46, 53 ) );
const index = parseInt( lines[ i ].slice( 6, 11 ) ) - 1;
let e = trim( lines[ i ].slice( 76, 78 ) ).toLowerCase();
if ( e === '' ) {
e = trim( lines[ i ].slice( 12, 14 ) ).toLowerCase();
}
const atomData = [ x, y, z, CPK[ e ], capitalize( e ) ];
atoms.push( atomData );
_atomMap[ index ] = atomData;
} else if ( lines[ i ].slice( 0, 6 ) === 'CONECT' ) {
const satom = parseInt( lines[ i ].slice( 6, 11 ) );
parseBond( 11, 5, satom, i );
parseBond( 16, 5, satom, i );
parseBond( 21, 5, satom, i );
parseBond( 26, 5, satom, i );
}
}
// build and return geometry
return buildGeometry();
}
}
export { PDBLoader };
