Some fixes, draw lines on board, add 7 variants

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

diff --git a/client/src/variants/Coronation.js b/client/src/variants/Coronation.js
new file mode 100644 (file)
index 0000000..9e12ea1
--- /dev/null
+++ b/client/src/variants/Coronation.js
@@ -0,0 +1,50 @@
+import { ChessRules, Move, PiPo } from "@/base_rules";
+
+export class CoronationRules extends ChessRules {
+  getPotentialMovesFrom([x, y]) {
+    let moves = super.getPotentialMovesFrom([x, y]);
+    // If no queen on board, allow rook+bishop fusions:
+    const color = this.turn;
+    const piece = this.getPiece(x, y);
+    if (
+      [V.ROOK, V.BISHOP].includes(piece) &&
+      this.board.every(b => b.every(cell =>
+        (cell == V.EMPTY || cell[0] != color || cell[1] != V.QUEEN)
+      ))
+    ) {
+      const fusionWith = [V.ROOK, V.BISHOP][1 - "rb".indexOf(piece)];
+      // Can I "self-capture" fusionWith ?
+      for (let step of V.steps[piece]) {
+        let [i, j] = [x + step[0], y + step[1]];
+        while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
+          i += step[0];
+          j += step[1];
+        }
+        if (
+          V.OnBoard(i, j) &&
+          this.getColor(i, j) == color &&
+          this.getPiece(i, j) == fusionWith
+        ) {
+          moves.push(
+            new Move({
+              appear: [new PiPo({ x: i, y: j, p: V.QUEEN, c: color })],
+              vanish: [
+                new PiPo({ x: x, y: y, p: piece, c: color }),
+                new PiPo({ x: i, y: j, p: fusionWith, c: color })
+              ]
+            })
+          );
+        }
+      }
+    }
+    return moves;
+  }
+
+  getNotation(move) {
+    let notation = super.getNotation(move);
+    if (move.appear[0].p == V.QUEEN && move.vanish[0].p != V.QUEEN)
+      // Coronation
+      notation += "=Q";
+    return notation;
+  }
+};