port utils

src/Utils.ts

+class Utils {
+  static getExpScore(
+    expA: number,
+    expB: number,
+    scoreA: number,
+    scoreB: number,
+  ) {
+    let rExpA = expA,
+      rExpB = expB;
+    if (scoreA === scoreB) {
+      rExpA += 0.5;
+      rExpB += 0.5;
+    } else if (scoreA > scoreB) {
+      rExpA += 1;
+      if (expA > expB) rExpB += 0.5;
+    } else if (scoreA < scoreB) {
+      rExpB += 1;
+      if (expA < expB) rExpA += 0.5;
+    }
+    return { expA: rExpA, expB: rExpB };
+  }
+  static getEloScore(rA: number, rB: number, sA: number, sB: number) {
+    //17.07.18 增加规则，平局不加分.
+    if (sA === sB) {
+      return { ptA: rA, ptB: rB };
+    }
+
+    const k = 24;
+    const eA = 1 / (1 + Math.pow(10, (rB - rA) / 400));
+    const eB = 1 / (1 + Math.pow(10, (rA - rB) / 400));
+
+    let diffA = k * (sA - eA);
+
+    // 如果算出的变动分数小于8或者大于16就按8和16计
+    if (diffA > 0 && diffA > 16) {
+      //console.log("diffA 加分大于16 按16分结算", diffA);
+      diffA = 16;
+    }
+
+    if (diffA > 0 && diffA < 8) {
+      //console.log("diffA 加分小于8 按8分结算", diffA);
+      diffA = 8;
+    }
+
+    if (diffA < 0 && diffA > -8) {
+      //console.log("diffA 扣分小于8 按8分结算算", diffA);
+      diffA = -8;
+    }
+
+    if (diffA < 0 && diffA < -15) {
+      //console.log("diffA 扣分大于16 按16分结算", diffA);
+      diffA = -15;
+    }
+
+    const rrA = rA + diffA;
+
+    let diffB = k * (sB - eB);
+
+    // 如果算出的变动分数小于8或者大于16就按8和16计
+    if (diffB > 0 && diffB > 16) {
+      //console.log("diffB 加分大于16 按16分结算", diffB);
+      diffB = 16;
+    }
+
+    if (diffB > 0 && diffB < 8) {
+      //console.log("diffB 加分小于8 按8分结算", diffB);
+      diffB = 8;
+    }
+
+    if (diffB < 0 && diffB > -8) {
+      //console.log("diffB 扣分小于8 按8分结算算", diffB);
+      diffB = -8;
+    }
+
+    if (diffB < 0 && diffB < -15) {
+      //console.log("diffB 扣分大于16 按16分结算", diffB);
+      diffB = -15;
+    }
+
+    const rrB = rB + diffB;
+
+    //console.log(diffA, diffB);
+
+    // // 加分高于16
+    // if( (rrB - rB) > 16 ) {
+    //     rrB  = rB + 16;
+    // }
+
+    // // 扣分低于8
+    // if( (rB - rrB) < 8 ) {
+    //     rrB = rB - 8;
+    // }
+
+    return { ptA: rrA, ptB: rrB };
+  }
+}