X-Git-Url: https://git.auder.net/?a=blobdiff_plain;f=client%2Fsrc%2Fvariants%2FAntiking.js;fp=client%2Fsrc%2Fvariants%2FAntiking.js;h=890da5800e337a480f1cd1d426c66d84e48bdd70;hb=8d61fc4ab7373b4a576f3f9108cdf7768ae27096;hp=0000000000000000000000000000000000000000;hpb=760865ac92508676c0047b84c5ba3e12d41d7c20;p=vchess.git

diff --git a/client/src/variants/Antiking.js b/client/src/variants/Antiking.js
new file mode 100644
index 00000000..890da580
--- /dev/null
+++ b/client/src/variants/Antiking.js
@@ -0,0 +1,200 @@
+class AntikingRules extends ChessRules
+{
+	static getPpath(b)
+	{
+		return b[1]=='a' ? "Antiking/"+b : b;
+	}
+
+	static get ANTIKING() { return 'a'; }
+
+	static get PIECES()
+	{
+		return ChessRules.PIECES.concat([V.ANTIKING]);
+	}
+
+	setOtherVariables(fen)
+	{
+		super.setOtherVariables(fen);
+		this.antikingPos = {'w':[-1,-1], 'b':[-1,-1]};
+		const rows = V.ParseFen(fen).position.split("/");
+		for (let i=0; i<rows.length; i++)
+		{
+			let k = 0;
+			for (let j=0; j<rows[i].length; j++)
+			{
+				switch (rows[i].charAt(j))
+				{
+					case 'a':
+						this.antikingPos['b'] = [i,k];
+						break;
+					case 'A':
+						this.antikingPos['w'] = [i,k];
+						break;
+					default:
+						const num = parseInt(rows[i].charAt(j));
+						if (!isNaN(num))
+							k += (num-1);
+				}
+				k++;
+			}
+		}
+	}
+
+	canTake([x1,y1], [x2,y2])
+	{
+		const piece1 = this.getPiece(x1,y1);
+		const piece2 = this.getPiece(x2,y2);
+		const color1 = this.getColor(x1,y1);
+		const color2 = this.getColor(x2,y2);
+		return piece2 != "a" &&
+			((piece1 != "a" && color1 != color2) || (piece1 == "a" && color1 == color2));
+	}
+
+	getPotentialMovesFrom([x,y])
+	{
+		switch (this.getPiece(x,y))
+		{
+			case V.ANTIKING:
+				return this.getPotentialAntikingMoves([x,y]);
+			default:
+				return super.getPotentialMovesFrom([x,y]);
+		}
+	}
+
+	getPotentialAntikingMoves(sq)
+	{
+		return this.getSlideNJumpMoves(sq,
+			V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep");
+	}
+
+	isAttacked(sq, colors)
+	{
+		return (super.isAttacked(sq, colors) || this.isAttackedByAntiking(sq, colors));
+	}
+
+	isAttackedByKing([x,y], colors)
+	{
+		if (this.getPiece(x,y) == V.ANTIKING)
+			return false; //antiking is not attacked by king
+		return this.isAttackedBySlideNJump([x,y], colors, V.KING,
+			V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep");
+	}
+
+	isAttackedByAntiking([x,y], colors)
+	{
+		if ([V.KING,V.ANTIKING].includes(this.getPiece(x,y)))
+			return false; //(anti)king is not attacked by antiking
+		return this.isAttackedBySlideNJump([x,y], colors, V.ANTIKING,
+			V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep");
+	}
+
+	underCheck(color)
+	{
+		const oppCol = V.GetOppCol(color);
+		let res = this.isAttacked(this.kingPos[color], [oppCol])
+			|| !this.isAttacked(this.antikingPos[color], [oppCol]);
+		return res;
+	}
+
+	getCheckSquares(color)
+	{
+		let res = super.getCheckSquares(color);
+		if (!this.isAttacked(this.antikingPos[color], [V.GetOppCol(color)]))
+			res.push(JSON.parse(JSON.stringify(this.antikingPos[color])));
+		return res;
+	}
+
+	updateVariables(move)
+	{
+		super.updateVariables(move);
+		const piece = move.vanish[0].p;
+		const c = move.vanish[0].c;
+		// Update antiking position
+		if (piece == V.ANTIKING)
+		{
+			this.antikingPos[c][0] = move.appear[0].x;
+			this.antikingPos[c][1] = move.appear[0].y;
+		}
+	}
+
+	unupdateVariables(move)
+	{
+		super.unupdateVariables(move);
+		const c = move.vanish[0].c;
+		if (move.vanish[0].p == V.ANTIKING)
+			this.antikingPos[c] = [move.start.x, move.start.y];
+	}
+
+	checkGameEnd()
+	{
+		const color = this.turn;
+		const oppCol = V.GetOppCol(color);
+		if (!this.isAttacked(this.kingPos[color], [oppCol])
+			&& this.isAttacked(this.antikingPos[color], [oppCol]))
+		{
+			return "1/2";
+		}
+		return color == "w" ? "0-1" : "1-0";
+	}
+
+	static get VALUES() {
+		return Object.assign(
+			ChessRules.VALUES,
+			{ 'a': 1000 }
+		);
+	}
+
+	static GenRandInitFen()
+	{
+		let pieces = { "w": new Array(8), "b": new Array(8) };
+		let antikingPos = { "w": -1, "b": -1 };
+		for (let c of ["w","b"])
+		{
+			let positions = range(8);
+
+			// Get random squares for bishops, but avoid corners; because,
+			// if an antiking blocks a cornered bishop, it can never be checkmated
+			let randIndex = 2 * random(1,4);
+			const bishop1Pos = positions[randIndex];
+			let randIndex_tmp = 2 * random(3) + 1;
+			const bishop2Pos = positions[randIndex_tmp];
+			positions.splice(Math.max(randIndex,randIndex_tmp), 1);
+			positions.splice(Math.min(randIndex,randIndex_tmp), 1);
+
+			randIndex = random(6);
+			const knight1Pos = positions[randIndex];
+			positions.splice(randIndex, 1);
+			randIndex = random(5);
+			const knight2Pos = positions[randIndex];
+			positions.splice(randIndex, 1);
+
+			randIndex = random(4);
+			const queenPos = positions[randIndex];
+			positions.splice(randIndex, 1);
+
+			const rook1Pos = positions[0];
+			const kingPos = positions[1];
+			const rook2Pos = positions[2];
+
+			// Random squares for antikings
+			antikingPos[c] = random(8);
+
+			pieces[c][rook1Pos] = 'r';
+			pieces[c][knight1Pos] = 'n';
+			pieces[c][bishop1Pos] = 'b';
+			pieces[c][queenPos] = 'q';
+			pieces[c][kingPos] = 'k';
+			pieces[c][bishop2Pos] = 'b';
+			pieces[c][knight2Pos] = 'n';
+			pieces[c][rook2Pos] = 'r';
+		}
+		const ranks23_black = "pppppppp/" + (antikingPos["w"]>0?antikingPos["w"]:"")
+			+ "A" + (antikingPos["w"]<7?7-antikingPos["w"]:"");
+		const ranks23_white = (antikingPos["b"]>0?antikingPos["b"]:"") + "a"
+			+ (antikingPos["b"]<7?7-antikingPos["b"]:"") + "/PPPPPPPP";
+		return pieces["b"].join("") + "/" + ranks23_black +
+			"/8/8/" +
+			ranks23_white + "/" + pieces["w"].join("").toUpperCase() +
+			" w 1111 -";
+	}
+}