Some fixes, draw lines on board, add 7 variants

[vchess.git] / client / src / variants / Dynamo.js

diff --git a/client/src/variants/Dynamo.js b/client/src/variants/Dynamo.js
index 57af913..cdb02c6 100644 (file)
--- a/client/src/variants/Dynamo.js
+++ b/client/src/variants/Dynamo.js
@@ -43,7 +43,6 @@ export class DynamoRules extends ChessRules {
       });
       this.amoves.push(move);
     }
-    this.subTurn = 1;
     // Stack "first moves" (on subTurn 1) to merge and check opposite moves
     this.firstMove = [];
   }
@@ -440,9 +439,10 @@ export class DynamoRules extends ChessRules {
     }
     const getPullExit = () => {
       // Piece at subTurn 1 exited: can I be pulled?
-      // Note: pawns and kings cannot suicide,
-      // so fm.vanish[0].p is neither PAWN or KING
+      // Note: kings cannot suicide, so fm.vanish[0].p is not KING.
+      // Could be PAWN though, if a pawn was pushed out of board.
       if (
+        fm.vanish[0].p != V.PAWN && //pawns cannot pull
         this.isAprioriValidExit(
           [x, y],
           [fm.start.x, fm.start.y],
@@ -598,6 +598,7 @@ export class DynamoRules extends ChessRules {
 
   filterValid(moves) {
     const color = this.turn;
+    const La = this.amoves.length;
     if (this.subTurn == 1) {
       return moves.filter(m => {
         // A move is valid either if it doesn't result in a check,
@@ -605,13 +606,17 @@ export class DynamoRules extends ChessRules {
         // (not undoing a potential move + action of the opponent)
         this.play(m);
         let res = this.underCheck(color);
-        if (res) {
+        let isOpposite = La > 0 && this.oppositeMoves(this.amoves[La-1], m);
+        if (res || isOpposite) {
           const moves2 = this.getAllPotentialMoves();
           for (let m2 of moves2) {
             this.play(m2);
             const res2 = this.underCheck(color);
+            const amove = this.getAmove(m, m2);
+            isOpposite =
+              La > 0 && this.oppositeMoves(this.amoves[La-1], amove);
             this.undo(m2);
-            if (!res2) {
+            if (!res2 && !isOpposite) {
               res = false;
               break;
             }
@@ -621,9 +626,8 @@ export class DynamoRules extends ChessRules {
         return !res;
       });
     }
-    const Lf = this.firstMove.length;
-    const La = this.amoves.length;
     if (La == 0) return super.filterValid(moves);
+    const Lf = this.firstMove.length;
     return (
       super.filterValid(
         moves.filter(m => {
@@ -682,12 +686,37 @@ export class DynamoRules extends ChessRules {
     const pawnShift = (color == "w" ? 1 : -1);
     for (let i of [-1, 1]) {
       if (
-        y + i >= 0 &&
-        y + i < V.size.y &&
+        V.OnBoard(x + pawnShift, y + i) &&
+        this.board[x + pawnShift][y + i] != V.EMPTY &&
         this.getPiece(x + pawnShift, y + i) == V.PAWN &&
         this.getColor(x + pawnShift, y + i) == color
       ) {
-        return !V.OnBoard(x - pawnShift, y - i);
+        if (!V.OnBoard(x - pawnShift, y - i)) return true;
+      }
+    }
+    return false;
+  }
+
+  static OnTheEdge(x, y) {
+    return (x == 0 || x == 7 || y == 0 || y == 7);
+  }
+
+  isAttackedByKing([x, y], color) {
+    // Attacked if I'm on the edge and the opponent king just next,
+    // but not on the edge.
+    if (V.OnTheEdge(x, y)) {
+      for (let step of V.steps[V.ROOK].concat(V.steps[V.BISHOP])) {
+        const [i, j] = [x + step[0], y + step[1]];
+        if (
+          V.OnBoard(i, j) &&
+          !V.OnTheEdge(i, j) &&
+          this.board[i][j] != V.EMPTY &&
+          this.getPiece(i, j) == V.KING
+          // NOTE: since only one king of each color, and (x, y) is occupied
+          // by our king, no need to check other king's color.
+        ) {
+          return true;
+        }
       }
     }
     return false;
@@ -720,13 +749,16 @@ export class DynamoRules extends ChessRules {
     // A click to promote a piece on subTurn 2 would trigger this.
     // For now it would then return [NaN, NaN] because surrounding squares
     // have no IDs in the promotion modal. TODO: improve this?
-    if (!square[0]) return null;
-    // If subTurn == 2 && square is empty && !underCheck,
+    if (isNaN(square[0])) return null;
+    // If subTurn == 2 && square is empty && !underCheck && !isOpposite,
     // then return an empty move, allowing to "pass" subTurn2
+    const La = this.amoves.length;
+    const Lf = this.firstMove.length;
     if (
       this.subTurn == 2 &&
       this.board[square[0]][square[1]] == V.EMPTY &&
-      !this.underCheck(this.turn)
+      !this.underCheck(this.turn) &&
+      (La == 0 || !this.oppositeMoves(this.amoves[La-1], this.firstMove[Lf-1]))
     ) {
       return {
         start: { x: -1, y: -1 },
@@ -774,6 +806,7 @@ export class DynamoRules extends ChessRules {
     this.disaggregateFlags(JSON.parse(move.flags));
     V.UndoOnBoard(this.board, move);
     if (this.subTurn == 1) {
+      this.amoves.pop();
       this.turn = V.GetOppCol(this.turn);
       this.movesCount--;
     }