Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import {
Component,
ElementRef,
EventEmitter,
HostBinding,
HostListener,
Input,
OnChanges,
OnDestroy,
OnInit,
Output,
SimpleChanges
} from '@angular/core';
import { Chess, Square } from 'chess.js';
import { defer, delay, flatten, without } from 'lodash-es';
import { autorun, IReactionDisposer } from 'mobx';
import { catchError, Observable, of, Subscription, throwError } from 'rxjs';
import { Ref } from '../../model/ref';
import { ActionService } from '../../service/action.service';
import { ConfigService } from '../../service/config.service';
import { Store } from '../../store/store';
export type PieceType = 'p' | 'n' | 'b' | 'r' | 'q' | 'k';
export type PieceColor = 'b' | 'w';
type Piece = { type: PieceType, color: PieceColor, square: Square, };
type AnimationState = { from: Square; to: Square; capture?: { square: Square; piece: Piece }; piece: Piece; boardState: (Piece | null)[], turnState: PieceColor, movesState: Square[] };
@Component({
selector: 'app-chess',
templateUrl: './chess.component.html',
styleUrls: ['./chess.component.scss'],
hostDirectives: [CdkDropListGroup],
host: { 'class': 'chess-board' },
imports: [CdkDropList, CdkDrag]
})
export class ChessComponent implements OnInit, OnChanges, OnDestroy {
private disposers: IReactionDisposer[] = [];
@Input()
ref?: Ref;
@Input()
text? = '';
@Input()
white = true; // TODO: Save in local storage
@Output()
comment = new EventEmitter<string>();
@Output()
copied = new EventEmitter<string>();
turn: PieceColor = 'w';
from?: Square;
to?: Square;
moves: Square[] = [];
chess = new Chess();
pieces: (Piece | null)[] = flatten(this.chess.board());
writeAccess = false;
translate: string[] = [];
lastMoveTo?: Square;
animating = false;
animationQueue: AnimationState[] = [];
movingPiece?: { piece: Piece; from: Square; to: Square };
capturedPiece?: { piece: Piece; square: Square };
@HostBinding('class.flip')
flip = false;
private resizeObserver = window.ResizeObserver && new ResizeObserver(() => this.onResize()) || undefined;
private fen = '';
private watch?: Subscription;
private append$!: (value: string) => Observable<string>;
private board?: string;
private retry: string[] = [];
constructor(
public config: ConfigService,
private actions: ActionService,
private store: Store,
private el: ElementRef<HTMLDivElement>,
) {
this.disposers.push(autorun(() => {
Iif (this.store.eventBus.event === 'flip' && this.store.eventBus.ref?.url === this.ref?.url) {
this.flip = true;
delay(() => {
this.flip = false;
this.white = !this.white;
}, 1000);
defer(() => this.store.eventBus.fire('flip-done'));
}
}));
}
ngOnInit(): void {
this.resizeObserver?.observe(this.el.nativeElement);
this.onResize();
}
init() {
this.reset(this.ref?.comment || this.text);
if (!this.watch && this.ref) {
const watch = this.actions.append(this.ref);
this.append$ = watch.append$;
this.watch = watch.updates$.pipe(
catchError(err => {
if (err.url) {
// Game history rewritten
alert($localize`Game History Rewritten!\n\nPlease Reload.`);
}
return of();
}),
).subscribe(move => {
try {
this.chess.move(move);
this.check();
if (this.retry.length) {
if (this.retry[0] === move) {
// TODO: also check move number?
this.retry.shift();
return;
} else {
this.retrySave();
}
}
const boardState = flatten(this.chess.board());
const turnState = this.chess.turn();
const movesState = this.chess.moves({ verbose: true }).map(m => m.to);
const moveObj = this.chess.history({ verbose: true }).pop();
if (moveObj) {
const capturedPieceInfo = moveObj.captured ? {
square: moveObj.to,
piece: { type: moveObj.captured, color: moveObj.color === 'w' ? 'b' : 'w', square: moveObj.to } as Piece
} : undefined;
this.queueAnimation({
from: moveObj.from,
to: moveObj.to,
capture: capturedPieceInfo,
piece: { type: moveObj.piece, color: moveObj.color, square: moveObj.to },
boardState,
turnState,
movesState
});
}
} catch (e) {
this.clearErrors();
}
});
}
}
ngOnChanges(changes: SimpleChanges) {
if (changes.ref || changes.text) {
const newRef = changes.ref?.firstChange || changes.ref?.previousValue?.url !== changes.ref?.currentValue?.url;
if (!this.ref || newRef) {
this.watch?.unsubscribe();
if (this.ref || this.text != null) this.init();
}
}
}
ngOnDestroy() {
for (const dispose of this.disposers) dispose();
this.disposers.length = 0;
this.resizeObserver?.disconnect();
this.watch?.unsubscribe();
}
clearErrors() {
if (this.ref) {
this.actions.comment(this.history, this.ref!);
} else {
this.text = this.history;
}
}
reset(board?: string) {
if (this.board === board) return;
this.board = board;
this.chess.clear();
try {
if (board) {
const lines = board.trim().split('\n');
this.chess.load(lines[0]);
this.fen = this.chess.fen();
lines.shift();
for (const l of lines) {
if (!l.trim()) continue;
try {
this.chess.move(l);
} catch (e) {
console.log(e);
}
}
} else {
this.chess.loadPgn('');
}
} catch (e) {
try {
this.chess.loadPgn(board || '');
} catch (e) {
console.error(e);
}
}
this.render();
if (!this.ref || (this.ref.comment || '') !== this.history) {
this.clearErrors();
}
}
@HostListener('window:resize')
onResize() {
const dim = Math.floor(this.el.nativeElement.offsetWidth / 8);
const fontSize = Math.floor(0.75 * dim);
this.el.nativeElement.style.setProperty('--dim', dim + 'px');
this.el.nativeElement.style.setProperty('--piece-size', fontSize + 'px');
}
setPieceSize() {
const dim = Math.floor(this.el.nativeElement.offsetWidth / 8);
const fontSize = Math.floor(0.75 * dim);
document.body.style.setProperty('--drag-piece-size', fontSize + 'px');
}
drawPiece(p?: Piece | null) {
if (p?.color === 'w') {
switch (p.type) {
case 'k': return $localize`♔`;
case 'q': return $localize`♕`;
case 'r': return $localize`♖`;
case 'b': return $localize`♗`;
case 'n': return $localize`♘`;
case 'p': return $localize`♙`;
}
E} else if (p?.color === 'b') {
switch (p.type) {
case 'k': return $localize`♚`;
case 'q': return $localize`♛`;
case 'r': return $localize`♜`;
case 'b': return $localize`♝`;
case 'n': return $localize`♞`;
case 'p': return $localize`♟︎`;
}
}
return ' ';
}
getIndex(place: string) {
const col = place[0].toLowerCase().charCodeAt(0) - 'a'.charCodeAt(0);
const row = 9 - parseInt(place[1]);
return row * 8 + col;
}
getCoord(index: number): Square {
const col = index % 8;
const row = 8 - Math.floor(index / 8);
return String.fromCharCode('a'.charCodeAt(0) + col) + row as Square;
}
color(index: number) {
const col = (index % 8) % 2;
const row = Math.floor(index / 8) % 2;
return col === row ? 'light' : 'dark';
}
drop(event: CdkDragDrop<number, number, Piece>) {
const from = this.getCoord(event.previousContainer.data);
const to = this.getCoord(event.container.data);
if (from === to) return;
this.move(from, to);
}
move(from: Square, to: Square) {
if (from === to) return;
const isPromotion = !!this.chess.moves({ verbose: true }).find((move) => move.from === from && move.to === to && move.flags.includes('p'));
const move = this.chess.move({from, to, promotion: isPromotion ? confirm($localize`Promote to Queen:`) ? 'q' : prompt($localize`Promotion:`) as Exclude<PieceType, 'p' | 'k'> : undefined});
if (move) {
this.render();
this.check();
this.save(move.san);
}
}
render() {
this.pieces = flatten(this.chess.board());
this.lastMoveTo = this.chess.history({ verbose: true }).pop()?.to;
this.turn = this.chess.turn();
this.moves = this.chess.moves({ verbose: true }).map(m => m.to);
}
check() {
if (this.chess.isGameOver()) {
defer(() => {
if (this.chess.isCheckmate()) {
alert($localize`Checkmate!`);
} else if (this.chess.isStalemate()) {
alert($localize`Stalemate!`);
} else if (this.chess.isThreefoldRepetition()) {
alert($localize`Threefold Repetition!`);
} else if (this.chess.isInsufficientMaterial()) {
alert($localize`Insufficient Material!`);
} else if (this.chess.isDraw()) {
alert($localize`Draw!`);
} else {
alert($localize`Game Over!`);
}
});
}
delete this.from;
delete this.to;
}
get history() {
return (this.fen ? this.fen + '\n\n' : '') + this.chess.history().join(' \n');
}
save(move: string) {
this.comment.emit(this.history);
this.append$(move).pipe(
catchError(err => {
this.retry.push(move);
delay(() => {
if (this.retry.length) {
this.clearErrors();
}
}, 1000);
return throwError(() => err);
}),
).subscribe();
}
retrySave() {
if (!this.retry.length) return;
const move = this.retry.shift()!;
if (this.chess.moves().includes(move)) {
this.append$(move).pipe(
catchError(err => {
this.retry.unshift(move);
return throwError(() => err);
}),
).subscribe();
} else {
this.retry.length = 0;
}
}
clickSquare(index: number) {
const square = this.getCoord(index);
const p = this.chess.get(square);
if (this.from === square) {
delete this.from;
this.moves = this.chess.moves({ verbose: true }).map(m => m.to);
} else if (this.turn === p?.color) {
this.from = square;
this.moves = this.chess.moves({ square, verbose: true }).map(m => m.to);
} else if (this.from) {
this.to = square;
this.move(this.from, square);
}
}
private getMoveCoord(move: string, turn: PieceColor): Square {
if (move === 'O-O') {
return turn === 'w' ? 'g1' : 'g8';
} else if (move === 'O-O-O') {
return turn === 'w' ? 'c1' : 'c8';
} else {
return move.replace(/[^a-h1-8]/g, '') as Square;
}
}
queueAnimation(state: AnimationState) {
this.animationQueue.push(state);
if (!this.animating) {
this.processAnimationQueue();
}
}
processAnimationQueue() {
if (this.animationQueue.length === 0) {
this.animating = false;
delete this.movingPiece;
delete this.capturedPiece;
this.render();
this.check();
return;
}
this.animating = true;
const animation = this.animationQueue.shift()!;
this.pieces = animation.boardState;
this.turn = animation.turnState;
this.moves = animation.movesState;
this.lastMoveTo = animation.to;
this.movingPiece = { piece: animation.piece, from: animation.from, to: animation.to };
if (animation.capture) {
this.capturedPiece = animation.capture;
}
// Calculate coordinates for CSS animation
const fromIndex = this.getIndex(animation.from);
const toIndex = this.getIndex(animation.to);
const fromCol = fromIndex % 8;
const fromRow = Math.floor(fromIndex / 8);
const toCol = toIndex % 8;
const toRow = Math.floor(toIndex / 8);
// Calculate deltas - the piece at destination needs to animate FROM source position
// So we need the negative offset from destination back to source
const xFrom = this.white ? -(toCol - fromCol) : -(fromCol - toCol);
const yFrom = this.white ? -(toRow - fromRow) : -(fromRow - toRow);
const xTo = 0;
const yTo = 0;
// Set CSS variables on the host element
this.el.nativeElement.style.setProperty('--xFrom', xFrom.toString());
this.el.nativeElement.style.setProperty('--yFrom', yFrom.toString());
this.el.nativeElement.style.setProperty('--xTo', xTo.toString());
this.el.nativeElement.style.setProperty('--yTo', yTo.toString());
// Animate the piece moving to its destination with translation
const movingPiece = animation.to;
this.translate.push(movingPiece);
// Remove captured piece animation after it completes (delay + duration)
// Capture animation: 1.0s delay + 0.8s animation = 1.8s total
if (animation.capture) {
delay(() => {
delete this.capturedPiece;
}, 1800);
}
// Remove animation after completion (wait for capture to finish if present)
const totalDuration = animation.capture ? 1900 : 1600;
delay(() => {
this.translate = without(this.translate, movingPiece);
delete this.movingPiece;
// capturedPiece already deleted above if it existed
if (!animation.capture) {
delete this.capturedPiece;
}
// Process next animation after current one completes
this.processAnimationQueue();
}, totalDuration);
}
}
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