Add Minixiangqi, fix a few typos

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

diff --git a/client/src/variants/Minixiangqi.js b/client/src/variants/Minixiangqi.js
new file mode 100644 (file)
index 0000000..c027aed
--- /dev/null
+++ b/client/src/variants/Minixiangqi.js
@@ -0,0 +1,93 @@
+import { ChessRules, PiPo, Move } from "@/base_rules";
+import { XiangqiRules } from "@/variants/Xiangqi"
+
+export class MinixiangqiRules extends XiangqiRules {
+
+  static get Lines() {
+    let lines = [];
+    // Draw all inter-squares lines, shifted:
+    for (let i = 0; i < V.size.x; i++)
+      lines.push([[i+0.5, 0.5], [i+0.5, V.size.y-0.5]]);
+    for (let j = 0; j < V.size.y; j++)
+      lines.push([[0.5, j+0.5], [V.size.x-0.5, j+0.5]]);
+    // Add palaces:
+    lines.push([[0.5, 2.5], [2.5, 4.5]]);
+    lines.push([[0.5, 4.5], [2.5, 2.5]]);
+    lines.push([[4.5, 2.5], [6.5, 4.5]]);
+    lines.push([[4.5, 4.5], [6.5, 2.5]]);
+    return lines;
+  }
+
+  // No elephants or advisors
+  static get PIECES() {
+    return [V.PAWN, V.ROOK, V.KNIGHT, V.KING, V.CANNON];
+  }
+
+  getPpath(b) {
+    return "Xiangqi/" + b;
+  }
+
+  static get size() {
+    return { x: 7, y: 7};
+  }
+
+  getPotentialMovesFrom(sq) {
+    switch (this.getPiece(sq[0], sq[1])) {
+      case V.PAWN: return this.getPotentialPawnMoves(sq);
+      case V.ROOK: return super.getPotentialRookMoves(sq);
+      case V.KNIGHT: return super.getPotentialKnightMoves(sq);
+      case V.KING: return super.getPotentialKingMoves(sq);
+      case V.CANNON: return super.getPotentialCannonMoves(sq);
+    }
+    return []; //never reached
+  }
+
+  getPotentialPawnMoves([x, y]) {
+    const c = this.getColor(x, y);
+    const shiftX = (c == 'w' ? -1 : 1);
+    const lastRank = (c == 'w' && x == 0 || c == 'b' && x == 6);
+    let steps = [];
+    if (!lastRank) steps.push([shiftX, 0]);
+    if (y > 0) steps.push([0, -1]);
+    if (y < 9) steps.push([0, 1]);
+    return super.getSlideNJumpMoves([x, y], steps, "oneStep");
+  }
+
+  insidePalace(x, y, c) {
+    return (
+      (y >= 2 && y <= 4) &&
+      (
+        (c == 'w' && x >= 4) ||
+        (c == 'b' && x <= 2)
+      )
+    );
+  }
+
+  static get VALUES() {
+    return {
+      p: 2,
+      r: 9,
+      n: 4,
+      c: 4.5,
+      k: 1000
+    };
+  }
+
+  // Back to ChessRules method:
+  evalPosition() {
+    let evaluation = 0;
+    for (let i = 0; i < V.size.x; i++) {
+      for (let j = 0; j < V.size.y; j++) {
+        if (this.board[i][j] != V.EMPTY)
+          evaluation += (c == 'w' ? 1 : -1) * V.VALUES[this.getPiece(i, j)];
+      }
+    }
+    return evaluation;
+  }
+
+  // Also no randomization here
+  static GenRandInitFen() {
+    return "rcnkncr/p1ppp1p/7/7/7/P1PPP1P/RCNKNCR w 0";
+  }
+
+};