[vchess.git] / public / javascripts / components / board.js

Vue.component('my-board', {
	// Last move cannot be guessed from here, and is required to highlight squares
	// gotoMove : juste set FEN depuis FEN stocké dans le coup (TODO)
	// send event after each move (or undo), to notify what was played
	// also notify end of game (which returns here later through prop...)
	props: ["fen","moveToPlay","moveToUndo",
		"analyze","lastMove","orientation","userColor","gameOver"],
	data: function () {
		return {
			hints: (!localStorage["hints"] ? true : localStorage["hints"] === "1"),
			bcolor: localStorage["bcolor"] || "lichess", //lichess, chesscom or chesstempo
			possibleMoves: [], //filled after each valid click/dragstart
			choices: [], //promotion pieces, or checkered captures... (as moves)
			selectedPiece: null, //moving piece (or clicked piece)
			incheck: [],
			start: {}, //pixels coordinates + id of starting square (click or drag)
			vr: null, //object to check moves, store them, FEN..
		};
	},
	watch: {
		// NOTE: maybe next 3 should be encapsulated in object to be watched (?)
		fen: function(newFen) {
			this.vr = new VariantRules(newFen);
		},
		moveToPlay: function(move) {
			this.play(move, "animate");
		},
		moveToUndo: function(move) {
			this.undo(move);
		},
	},
	created: function() {
		this.vr = new VariantRules(this.fen);
	},
	render(h) {
		const [sizeX,sizeY] = [V.size.x,V.size.y];
		// Precompute hints squares to facilitate rendering
		let hintSquares = doubleArray(sizeX, sizeY, false);
		this.possibleMoves.forEach(m => { hintSquares[m.end.x][m.end.y] = true; });
		// Also precompute in-check squares
		let incheckSq = doubleArray(sizeX, sizeY, false);
		this.incheck.forEach(sq => { incheckSq[sq[0]][sq[1]] = true; });
		const choices = h(
			'div',
			{
				attrs: { "id": "choices" },
				'class': { 'row': true },
				style: {
					"display": this.choices.length>0?"block":"none",
					"top": "-" + ((sizeY/2)*squareWidth+squareWidth/2) + "px",
					"width": (this.choices.length * squareWidth) + "px",
					"height": squareWidth + "px",
				},
			},
			this.choices.map(m => { //a "choice" is a move
				return h('div',
					{
						'class': {
							'board': true,
							['board'+sizeY]: true,
						},
						style: {
							'width': (100/this.choices.length) + "%",
							'padding-bottom': (100/this.choices.length) + "%",
						},
					},
					[h('img',
						{
							attrs: { "src": '/images/pieces/' +
								V.getPpath(m.appear[0].c+m.appear[0].p) + '.svg' },
							'class': { 'choice-piece': true },
							on: {
								"click": e => { this.play(m); this.choices=[]; },
								// NOTE: add 'touchstart' event to fix a problem on smartphones
								"touchstart": e => { this.play(m); this.choices=[]; },
							},
						})
					]
				);
			})
		);
		// Create board element (+ reserves if needed by variant or mode)
		const lm = this.lastMove;
		const showLight = this.hints && variant.name != "Dark";
		const gameDiv = h(
			'div',
			{
				'class': {
					'game': true,
					'clearer': true,
				},
			},
			[_.range(sizeX).map(i => {
				let ci = (this.orientation=='w' ? i : sizeX-i-1);
				return h(
					'div',
					{
						'class': {
							'row': true,
						},
						style: { 'opacity': this.choices.length>0?"0.5":"1" },
					},
					_.range(sizeY).map(j => {
						let cj = (this.orientation=='w' ? j : sizeY-j-1);
						let elems = [];
						if (this.vr.board[ci][cj] != V.EMPTY && (variant.name!="Dark"
							|| this.gameOver || this.vr.enlightened[this.userColor][ci][cj]))
						{
							elems.push(
								h(
									'img',
									{
										'class': {
											'piece': true,
											'ghost': !!this.selectedPiece
												&& this.selectedPiece.parentNode.id == "sq-"+ci+"-"+cj,
										},
										attrs: {
											src: "/images/pieces/" +
												V.getPpath(this.vr.board[ci][cj]) + ".svg",
										},
									}
								)
							);
						}
						if (this.hints && hintSquares[ci][cj])
						{
							elems.push(
								h(
									'img',
									{
										'class': {
											'mark-square': true,
										},
										attrs: {
											src: "/images/mark.svg",
										},
									}
								)
							);
						}
						return h(
							'div',
							{
								'class': {
									'board': true,
									['board'+sizeY]: true,
									'light-square': (i+j)%2==0,
									'dark-square': (i+j)%2==1,
									[this.bcolor]: true,
									'in-shadow': variant.name=="Dark" && !this.gameOver
										&& !this.vr.enlightened[this.userColor][ci][cj],
									'highlight': showLight && !!lm && _.isMatch(lm.end, {x:ci,y:cj}),
									'incheck': showLight && incheckSq[ci][cj],
								},
								attrs: {
									id: this.getSquareId({x:ci,y:cj}),
								},
							},
							elems
						);
					})
				);
			}), choices]
		);
		let elementArray = [choices, gameDiv];
		if (!!this.vr.reserve)
		{
			const shiftIdx = (this.userColor=="w" ? 0 : 1);
			let myReservePiecesArray = [];
			for (let i=0; i<V.RESERVE_PIECES.length; i++)
			{
				myReservePiecesArray.push(h('div',
				{
					'class': {'board':true, ['board'+sizeY]:true},
					attrs: { id: this.getSquareId({x:sizeX+shiftIdx,y:i}) }
				},
				[
					h('img',
					{
						'class': {"piece":true, "reserve":true},
						attrs: {
							"src": "/images/pieces/" +
								this.vr.getReservePpath(this.userColor,i) + ".svg",
						}
					}),
					h('sup',
						{"class": { "reserve-count": true } },
						[ this.vr.reserve[this.userColor][V.RESERVE_PIECES[i]] ]
					)
				]));
			}
			let oppReservePiecesArray = [];
			const oppCol = this.vr.getOppCol(this.userColor);
			for (let i=0; i<V.RESERVE_PIECES.length; i++)
			{
				oppReservePiecesArray.push(h('div',
				{
					'class': {'board':true, ['board'+sizeY]:true},
					attrs: { id: this.getSquareId({x:sizeX+(1-shiftIdx),y:i}) }
				},
				[
					h('img',
					{
						'class': {"piece":true, "reserve":true},
						attrs: {
							"src": "/images/pieces/" +
								this.vr.getReservePpath(oppCol,i) + ".svg",
						}
					}),
					h('sup',
						{"class": { "reserve-count": true } },
						[ this.vr.reserve[oppCol][V.RESERVE_PIECES[i]] ]
					)
				]));
			}
			let reserves = h('div',
				{
					'class':{
						'game': true,
						"reserve-div": true,
					},
				},
				[
					h('div',
						{
							'class': {
								'row': true,
								"reserve-row-1": true,
							},
						},
						myReservePiecesArray
					),
					h('div',
						{ 'class': { 'row': true }},
						oppReservePiecesArray
					)
				]
			);
			elementArray.push(reserves);
		}
		return h(
			'div',
			{
				'class': {
					"col-sm-12":true,
					"col-md-10":true,
					"col-md-offset-1":true,
					"col-lg-8":true,
					"col-lg-offset-2":true,
				},
				// NOTE: click = mousedown + mouseup
				on: {
					mousedown: this.mousedown,
					mousemove: this.mousemove,
					mouseup: this.mouseup,
					touchstart: this.mousedown,
					touchmove: this.mousemove,
					touchend: this.mouseup,
				},
			},
			elementArray
		);
	},
	methods: {
		// Get the identifier of a HTML square from its numeric coordinates o.x,o.y.
		getSquareId: function(o) {
			// NOTE: a separator is required to allow any size of board
			return  "sq-" + o.x + "-" + o.y;
		},
		// Inverse function
		getSquareFromId: function(id) {
			let idParts = id.split('-');
			return [parseInt(idParts[1]), parseInt(idParts[2])];
		},
		mousedown: function(e) {
			e = e || window.event;
			let ingame = false;
			let elem = e.target;
			while (!ingame && elem !== null)
			{
				if (elem.classList.contains("game"))
				{
					ingame = true;
					break;
				}
				elem = elem.parentElement;
			}
			if (!ingame) //let default behavior (click on button...)
				return;
			e.preventDefault(); //disable native drag & drop
			if (!this.selectedPiece && e.target.classList.contains("piece"))
			{
				// Next few lines to center the piece on mouse cursor
				let rect = e.target.parentNode.getBoundingClientRect();
				this.start = {
					x: rect.x + rect.width/2,
					y: rect.y + rect.width/2,
					id: e.target.parentNode.id
				};
				this.selectedPiece = e.target.cloneNode();
				this.selectedPiece.style.position = "absolute";
				this.selectedPiece.style.top = 0;
				this.selectedPiece.style.display = "inline-block";
				this.selectedPiece.style.zIndex = 3000;
				const startSquare = this.getSquareFromId(e.target.parentNode.id);
				this.possibleMoves = [];
				const color = this.analyze || this.gameOver
					? this.vr.turn
					: this.userColor;
				if (this.vr.canIplay(color,startSquare))
					this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
				// Next line add moving piece just after current image
				// (required for Crazyhouse reserve)
				e.target.parentNode.insertBefore(this.selectedPiece, e.target.nextSibling);
			}
		},
		mousemove: function(e) {
			if (!this.selectedPiece)
				return;
			e = e || window.event;
			// If there is an active element, move it around
			if (!!this.selectedPiece)
			{
				const [offsetX,offsetY] = !!e.clientX
					? [e.clientX,e.clientY] //desktop browser
					: [e.changedTouches[0].pageX, e.changedTouches[0].pageY]; //smartphone
				this.selectedPiece.style.left = (offsetX-this.start.x) + "px";
				this.selectedPiece.style.top = (offsetY-this.start.y) + "px";
			}
		},
		mouseup: function(e) {
			if (!this.selectedPiece)
				return;
			e = e || window.event;
			// Read drop target (or parentElement, parentNode... if type == "img")
			this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coords
			const [offsetX,offsetY] = !!e.clientX
				? [e.clientX,e.clientY]
				: [e.changedTouches[0].pageX, e.changedTouches[0].pageY];
			let landing = document.elementFromPoint(offsetX, offsetY);
			this.selectedPiece.style.zIndex = 3000;
			// Next condition: classList.contains(piece) fails because of marks
			while (landing.tagName == "IMG")
				landing = landing.parentNode;
			if (this.start.id == landing.id)
			{
				// A click: selectedPiece and possibleMoves are already filled
				return;
			}
			// OK: process move attempt
			let endSquare = this.getSquareFromId(landing.id);
			let moves = this.findMatchingMoves(endSquare);
			this.possibleMoves = [];
			if (moves.length > 1)
				this.choices = moves;
			else if (moves.length==1)
				this.play(moves[0]);
			// Else: impossible move
			this.selectedPiece.parentNode.removeChild(this.selectedPiece);
			delete this.selectedPiece;
			this.selectedPiece = null;
		},
		findMatchingMoves: function(endSquare) {
			// Run through moves list and return the matching set (if promotions...)
			let moves = [];
			this.possibleMoves.forEach(function(m) {
				if (endSquare[0] == m.end.x && endSquare[1] == m.end.y)
					moves.push(m);
			});
			return moves;
		},
		animateMove: function(move) {
			let startSquare = document.getElementById(this.getSquareId(move.start));
			let endSquare = document.getElementById(this.getSquareId(move.end));
			let rectStart = startSquare.getBoundingClientRect();
			let rectEnd = endSquare.getBoundingClientRect();
			let translation = {x:rectEnd.x-rectStart.x, y:rectEnd.y-rectStart.y};
			let movingPiece =
				document.querySelector("#" + this.getSquareId(move.start) + " > img.piece");
			// HACK for animation (with positive translate, image slides "under background")
			// Possible improvement: just alter squares on the piece's way...
			squares = document.getElementsByClassName("board");
			for (let i=0; i<squares.length; i++)
			{
				let square = squares.item(i);
				if (square.id != this.getSquareId(move.start))
					square.style.zIndex = "-1";
			}
			movingPiece.style.transform = "translate(" + translation.x + "px," +
				translation.y + "px)";
			movingPiece.style.transitionDuration = "0.2s";
			movingPiece.style.zIndex = "3000";
			setTimeout( () => {
				for (let i=0; i<squares.length; i++)
					squares.item(i).style.zIndex = "auto";
				movingPiece.style = {}; //required e.g. for 0-0 with KR swap
				this.play(move);
			}, 250);
		},
		play: function(move, programmatic) {
			if (!!programmatic) //computer or human opponent
				return this.animateMove(move);
			// Not programmatic, or animation is over
			this.vr.play(move);
			if (this.sound == 2)
				new Audio("/sounds/move.mp3").play().catch(err => {});
			// Is opponent in check?
			this.incheck = this.vr.getCheckSquares(this.vr.turn);
			const eog = this.vr.getCurrentScore();
			if (eog != "*")
			{
				// TODO: notify end of game (give score)
			}
		},
		undo: function(move) {
			this.vr.undo(move);
			if (this.sound == 2)
				new Audio("/sounds/undo.mp3").play().catch(err => {});
			this.incheck = this.vr.getCheckSquares(this.vr.turn);
		},
	},
})
Commit	Line	Data
e5dc87e0 BA	1	Vue.component('my-board', {
	2	// Last move cannot be guessed from here, and is required to highlight squares
	3	// gotoMove : juste set FEN depuis FEN stocké dans le coup (TODO)
	4	// send event after each move (or undo), to notify what was played
	5	// also notify end of game (which returns here later through prop...)
	6	props: ["fen","moveToPlay","moveToUndo",
	7	"analyze","lastMove","orientation","userColor","gameOver"],
	8	data: function () {
	9	return {
81da2786 BA	10	hints: (!localStorage["hints"] ? true : localStorage["hints"] === "1"),
	11	bcolor: localStorage["bcolor"] \|\| "lichess", //lichess, chesscom or chesstempo
	12	possibleMoves: [], //filled after each valid click/dragstart
	13	choices: [], //promotion pieces, or checkered captures... (as moves)
	14	selectedPiece: null, //moving piece (or clicked piece)
	15	incheck: [],
	16	start: {}, //pixels coordinates + id of starting square (click or drag)
	17	vr: null, //object to check moves, store them, FEN..
e5dc87e0 BA	18	};
	19	},
	20	watch: {
	21	// NOTE: maybe next 3 should be encapsulated in object to be watched (?)
	22	fen: function(newFen) {
	23	this.vr = new VariantRules(newFen);
	24	},
	25	moveToPlay: function(move) {
	26	this.play(move, "animate");
	27	},
	28	moveToUndo: function(move) {
	29	this.undo(move);
	30	},
	31	},
	32	created: function() {
	33	this.vr = new VariantRules(this.fen);
	34	},
	35	render(h) {
	36	const [sizeX,sizeY] = [V.size.x,V.size.y];
81da2786 BA	37	// Precompute hints squares to facilitate rendering
	38	let hintSquares = doubleArray(sizeX, sizeY, false);
	39	this.possibleMoves.forEach(m => { hintSquares[m.end.x][m.end.y] = true; });
	40	// Also precompute in-check squares
	41	let incheckSq = doubleArray(sizeX, sizeY, false);
	42	this.incheck.forEach(sq => { incheckSq[sq[0]][sq[1]] = true; });
e5dc87e0 BA	43	const choices = h(
	44	'div',
	45	{
	46	attrs: { "id": "choices" },
	47	'class': { 'row': true },
	48	style: {
	49	"display": this.choices.length>0?"block":"none",
	50	"top": "-" + ((sizeY/2)*squareWidth+squareWidth/2) + "px",
	51	"width": (this.choices.length * squareWidth) + "px",
	52	"height": squareWidth + "px",
81da2786	53	},
e5dc87e0 BA	54	},
	55	this.choices.map(m => { //a "choice" is a move
	56	return h('div',
	57	{
	58	'class': {
	59	'board': true,
	60	['board'+sizeY]: true,
	61	},
	62	style: {
	63	'width': (100/this.choices.length) + "%",
	64	'padding-bottom': (100/this.choices.length) + "%",
81da2786	65	},
81da2786	66	},
e5dc87e0	67	[h('img',
81da2786	68	{
e5dc87e0 BA	69	attrs: { "src": '/images/pieces/' +
	70	V.getPpath(m.appear[0].c+m.appear[0].p) + '.svg' },
	71	'class': { 'choice-piece': true },
	72	on: {
	73	"click": e => { this.play(m); this.choices=[]; },
	74	// NOTE: add 'touchstart' event to fix a problem on smartphones
	75	"touchstart": e => { this.play(m); this.choices=[]; },
81da2786	76	},
81da2786	77	})
e5dc87e0 BA	78	]
	79	);
	80	})
	81	);
	82	// Create board element (+ reserves if needed by variant or mode)
	83	const lm = this.lastMove;
	84	const showLight = this.hints && variant.name != "Dark";
	85	const gameDiv = h(
	86	'div',
81da2786	87	{
e5dc87e0 BA	88	'class': {
	89	'game': true,
	90	'clearer': true,
	91	},
	92	},
	93	[_.range(sizeX).map(i => {
	94	let ci = (this.orientation=='w' ? i : sizeX-i-1);
	95	return h(
	96	'div',
81da2786	97	{
e5dc87e0 BA	98	'class': {
	99	'row': true,
	100	},
	101	style: { 'opacity': this.choices.length>0?"0.5":"1" },
81da2786	102	},
e5dc87e0 BA	103	_.range(sizeY).map(j => {
	104	let cj = (this.orientation=='w' ? j : sizeY-j-1);
	105	let elems = [];
	106	if (this.vr.board[ci][cj] != V.EMPTY && (variant.name!="Dark"
	107	\|\| this.gameOver \|\| this.vr.enlightened[this.userColor][ci][cj]))
81da2786	108	{
e5dc87e0 BA	109	elems.push(
	110	h(
	111	'img',
	112	{
	113	'class': {
	114	'piece': true,
	115	'ghost': !!this.selectedPiece
	116	&& this.selectedPiece.parentNode.id == "sq-"+ci+"-"+cj,
	117	},
	118	attrs: {
	119	src: "/images/pieces/" +
	120	V.getPpath(this.vr.board[ci][cj]) + ".svg",
	121	},
	122	}
	123	)
	124	);
	125	}
	126	if (this.hints && hintSquares[ci][cj])
81da2786	127	{
e5dc87e0 BA	128	elems.push(
	129	h(
	130	'img',
	131	{
	132	'class': {
	133	'mark-square': true,
	134	},
	135	attrs: {
	136	src: "/images/mark.svg",
	137	},
	138	}
	139	)
	140	);
	141	}
	142	return h(
	143	'div',
81da2786 BA	144	{
81da2786 BA	145	'class': {
e5dc87e0 BA	146	'board': true,
	147	['board'+sizeY]: true,
	148	'light-square': (i+j)%2==0,
	149	'dark-square': (i+j)%2==1,
	150	[this.bcolor]: true,
	151	'in-shadow': variant.name=="Dark" && !this.gameOver
	152	&& !this.vr.enlightened[this.userColor][ci][cj],
	153	'highlight': showLight && !!lm && _.isMatch(lm.end, {x:ci,y:cj}),
	154	'incheck': showLight && incheckSq[ci][cj],
	155	},
	156	attrs: {
	157	id: this.getSquareId({x:ci,y:cj}),
81da2786 BA	158	},
81da2786 BA	159	},
e5dc87e0 BA	160	elems
	161	);
	162	})
81da2786	163	);
e5dc87e0 BA	164	}), choices]
	165	);
	166	let elementArray = [choices, gameDiv];
	167	if (!!this.vr.reserve)
	168	{
	169	const shiftIdx = (this.userColor=="w" ? 0 : 1);
	170	let myReservePiecesArray = [];
	171	for (let i=0; i<V.RESERVE_PIECES.length; i++)
	172	{
	173	myReservePiecesArray.push(h('div',
	174	{
	175	'class': {'board':true, ['board'+sizeY]:true},
	176	attrs: { id: this.getSquareId({x:sizeX+shiftIdx,y:i}) }
	177	},
	178	[
	179	h('img',
	180	{
	181	'class': {"piece":true, "reserve":true},
	182	attrs: {
	183	"src": "/images/pieces/" +
	184	this.vr.getReservePpath(this.userColor,i) + ".svg",
	185	}
	186	}),
	187	h('sup',
	188	{"class": { "reserve-count": true } },
	189	[ this.vr.reserve[this.userColor][V.RESERVE_PIECES[i]] ]
	190	)
	191	]));
	192	}
	193	let oppReservePiecesArray = [];
	194	const oppCol = this.vr.getOppCol(this.userColor);
	195	for (let i=0; i<V.RESERVE_PIECES.length; i++)
	196	{
	197	oppReservePiecesArray.push(h('div',
	198	{
	199	'class': {'board':true, ['board'+sizeY]:true},
	200	attrs: { id: this.getSquareId({x:sizeX+(1-shiftIdx),y:i}) }
	201	},
	202	[
	203	h('img',
	204	{
	205	'class': {"piece":true, "reserve":true},
	206	attrs: {
	207	"src": "/images/pieces/" +
	208	this.vr.getReservePpath(oppCol,i) + ".svg",
	209	}
	210	}),
	211	h('sup',
	212	{"class": { "reserve-count": true } },
	213	[ this.vr.reserve[oppCol][V.RESERVE_PIECES[i]] ]
	214	)
	215	]));
81da2786	216	}
e5dc87e0 BA	217	let reserves = h('div',
	218	{
	219	'class':{
	220	'game': true,
	221	"reserve-div": true,
	222	},
	223	},
	224	[
81da2786 BA	225	h('div',
81da2786 BA	226	{
e5dc87e0 BA	227	'class': {
	228	'row': true,
	229	"reserve-row-1": true,
	230	},
81da2786	231	},
e5dc87e0 BA	232	myReservePiecesArray
	233	),
	234	h('div',
	235	{ 'class': { 'row': true }},
	236	oppReservePiecesArray
81da2786	237	)
e5dc87e0 BA	238	]
	239	);
	240	elementArray.push(reserves);
	241	}
	242	return h(
	243	'div',
	244	{
	245	'class': {
	246	"col-sm-12":true,
	247	"col-md-10":true,
	248	"col-md-offset-1":true,
	249	"col-lg-8":true,
	250	"col-lg-offset-2":true,
	251	},
	252	// NOTE: click = mousedown + mouseup
81da2786 BA	253	on: {
	254	mousedown: this.mousedown,
	255	mousemove: this.mousemove,
	256	mouseup: this.mouseup,
	257	touchstart: this.mousedown,
	258	touchmove: this.mousemove,
	259	touchend: this.mouseup,
	260	},
e5dc87e0 BA	261	},
	262	elementArray
	263	);
	264	},
	265	methods: {
	266	// Get the identifier of a HTML square from its numeric coordinates o.x,o.y.
81da2786 BA	267	getSquareId: function(o) {
	268	// NOTE: a separator is required to allow any size of board
	269	return "sq-" + o.x + "-" + o.y;
	270	},
	271	// Inverse function
	272	getSquareFromId: function(id) {
	273	let idParts = id.split('-');
	274	return [parseInt(idParts[1]), parseInt(idParts[2])];
	275	},
	276	mousedown: function(e) {
	277	e = e \|\| window.event;
	278	let ingame = false;
	279	let elem = e.target;
	280	while (!ingame && elem !== null)
	281	{
	282	if (elem.classList.contains("game"))
	283	{
	284	ingame = true;
	285	break;
	286	}
	287	elem = elem.parentElement;
	288	}
	289	if (!ingame) //let default behavior (click on button...)
	290	return;
	291	e.preventDefault(); //disable native drag & drop
	292	if (!this.selectedPiece && e.target.classList.contains("piece"))
	293	{
	294	// Next few lines to center the piece on mouse cursor
	295	let rect = e.target.parentNode.getBoundingClientRect();
	296	this.start = {
	297	x: rect.x + rect.width/2,
	298	y: rect.y + rect.width/2,
	299	id: e.target.parentNode.id
	300	};
	301	this.selectedPiece = e.target.cloneNode();
	302	this.selectedPiece.style.position = "absolute";
	303	this.selectedPiece.style.top = 0;
	304	this.selectedPiece.style.display = "inline-block";
	305	this.selectedPiece.style.zIndex = 3000;
	306	const startSquare = this.getSquareFromId(e.target.parentNode.id);
	307	this.possibleMoves = [];
e5dc87e0 BA	308	const color = this.analyze \|\| this.gameOver
	309	? this.vr.turn
	310	: this.userColor;
	311	if (this.vr.canIplay(color,startSquare))
	312	this.possibleMoves = this.vr.getPossibleMovesFrom(startSquare);
81da2786 BA	313	// Next line add moving piece just after current image
	314	// (required for Crazyhouse reserve)
	315	e.target.parentNode.insertBefore(this.selectedPiece, e.target.nextSibling);
	316	}
	317	},
	318	mousemove: function(e) {
	319	if (!this.selectedPiece)
	320	return;
	321	e = e \|\| window.event;
	322	// If there is an active element, move it around
	323	if (!!this.selectedPiece)
	324	{
	325	const [offsetX,offsetY] = !!e.clientX
	326	? [e.clientX,e.clientY] //desktop browser
	327	: [e.changedTouches[0].pageX, e.changedTouches[0].pageY]; //smartphone
	328	this.selectedPiece.style.left = (offsetX-this.start.x) + "px";
	329	this.selectedPiece.style.top = (offsetY-this.start.y) + "px";
	330	}
	331	},
	332	mouseup: function(e) {
	333	if (!this.selectedPiece)
	334	return;
	335	e = e \|\| window.event;
	336	// Read drop target (or parentElement, parentNode... if type == "img")
	337	this.selectedPiece.style.zIndex = -3000; //HACK to find square from final coords
	338	const [offsetX,offsetY] = !!e.clientX
	339	? [e.clientX,e.clientY]
	340	: [e.changedTouches[0].pageX, e.changedTouches[0].pageY];
	341	let landing = document.elementFromPoint(offsetX, offsetY);
	342	this.selectedPiece.style.zIndex = 3000;
	343	// Next condition: classList.contains(piece) fails because of marks
	344	while (landing.tagName == "IMG")
	345	landing = landing.parentNode;
	346	if (this.start.id == landing.id)
	347	{
	348	// A click: selectedPiece and possibleMoves are already filled
	349	return;
	350	}
	351	// OK: process move attempt
	352	let endSquare = this.getSquareFromId(landing.id);
	353	let moves = this.findMatchingMoves(endSquare);
	354	this.possibleMoves = [];
	355	if (moves.length > 1)
	356	this.choices = moves;
	357	else if (moves.length==1)
	358	this.play(moves[0]);
	359	// Else: impossible move
	360	this.selectedPiece.parentNode.removeChild(this.selectedPiece);
	361	delete this.selectedPiece;
	362	this.selectedPiece = null;
	363	},
	364	findMatchingMoves: function(endSquare) {
	365	// Run through moves list and return the matching set (if promotions...)
	366	let moves = [];
	367	this.possibleMoves.forEach(function(m) {
	368	if (endSquare[0] == m.end.x && endSquare[1] == m.end.y)
	369	moves.push(m);
	370	});
	371	return moves;
	372	},
	373	animateMove: function(move) {
	374	let startSquare = document.getElementById(this.getSquareId(move.start));
	375	let endSquare = document.getElementById(this.getSquareId(move.end));
	376	let rectStart = startSquare.getBoundingClientRect();
377	let rectEnd = endSquare.getBoundingClientRect();
378	let translation = {x:rectEnd.x-rectStart.x, y:rectEnd.y-rectStart.y};
379	let movingPiece =
380	document.querySelector("#" + this.getSquareId(move.start) + " > img.piece");
381	// HACK for animation (with positive translate, image slides "under background")
382	// Possible improvement: just alter squares on the piece's way...
383	squares = document.getElementsByClassName("board");
384	for (let i=0; i<squares.length; i++)
385	{
386	let square = squares.item(i);
387	if (square.id != this.getSquareId(move.start))
388	square.style.zIndex = "-1";
389	}
390	movingPiece.style.transform = "translate(" + translation.x + "px," +
391	translation.y + "px)";
392	movingPiece.style.transitionDuration = "0.2s";
393	movingPiece.style.zIndex = "3000";
394	setTimeout( () => {
395	for (let i=0; i<squares.length; i++)
396	squares.item(i).style.zIndex = "auto";
397	movingPiece.style = {}; //required e.g. for 0-0 with KR swap
398	this.play(move);
399	}, 250);
400	},
e5dc87e0 BA	401	play: function(move, programmatic) {
	402	if (!!programmatic) //computer or human opponent
	403	return this.animateMove(move);
	404	// Not programmatic, or animation is over
	405	this.vr.play(move);
	406	if (this.sound == 2)
	407	new Audio("/sounds/move.mp3").play().catch(err => {});
	408	// Is opponent in check?
	409	this.incheck = this.vr.getCheckSquares(this.vr.turn);
	410	const eog = this.vr.getCurrentScore();
	411	if (eog != "*")
	412	{
	413	// TODO: notify end of game (give score)
	414	}
	415	},
	416	undo: function(move) {
	417	this.vr.undo(move);
	418	if (this.sound == 2)
	419	new Audio("/sounds/undo.mp3").play().catch(err => {});
	420	this.incheck = this.vr.getCheckSquares(this.vr.turn);
	421	},
	422	},
	423	})