feat: PP钻带基础信息显示X/Y间距

检测PP钻带（文件名-pp结尾、4孔、直径4.000），计算上下孔X间距和左右孔Y间距
（欧氏距离），在MainWindow和StartupSelectionWindow的基础信息中显示。

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

MainWindowViewModel.cs

@@ -33,6 +33,9 @@ namespace DrillTools
         private bool _isStartupDrillTapeFile;
         private bool _canGeneratePpDrillTape;
         private bool _shouldCheckSortFileOnLoad = true;
+        private bool _isPpDrillTape;
+        private double _ppXSpacing;
+        private double _ppYSpacing;
 
         private const int SwRestore = 9;
         private const int SvsiSelect = 0x1;
@@ -209,6 +212,33 @@ namespace DrillTools
             set => SetProperty(ref _minEADiameter, value);
         }
 
+        /// <summary>
+        /// 是否为PP钻带
+        /// </summary>
+        public bool IsPpDrillTape
+        {
+            get => _isPpDrillTape;
+            set => SetProperty(ref _isPpDrillTape, value);
+        }
+
+        /// <summary>
+        /// PP钻带X间距（左右孔距离，单位mm）
+        /// </summary>
+        public double PpXSpacing
+        {
+            get => _ppXSpacing;
+            set => SetProperty(ref _ppXSpacing, value);
+        }
+
+        /// <summary>
+        /// PP钻带Y间距（上下孔距离，单位mm）
+        /// </summary>
+        public double PpYSpacing
+        {
+            get => _ppYSpacing;
+            set => SetProperty(ref _ppYSpacing, value);
+        }
+
         /// <summary>
         /// 从钻带内容加载刀具信息
         /// </summary>
@@ -316,6 +346,9 @@ namespace DrillTools
                     // 计算并更新最小直径信息
                     UpdateMinDiameterInfo();
 
+                    // 计算PP钻带间距
+                    UpdatePpSpacingInfo();
+
                     // 启动菜单的预检查和非调整刀序动作会关闭此开关，避免排序提示抢在菜单前弹出。
                     if (ShouldCheckSortFileOnLoad && !string.IsNullOrEmpty(OriginalFilePath))
                     {
@@ -1709,6 +1742,99 @@ M30";
             System.Diagnostics.Debug.WriteLine($"=== 计算完成 ===");
         }
 
+        /// <summary>
+        /// 更新PP钻带间距信息
+        /// </summary>
+        private void UpdatePpSpacingInfo()
+        {
+            IsPpDrillTape = false;
+            PpXSpacing = 0;
+            PpYSpacing = 0;
+
+            // 检测条件：文件名以-pp结尾，恰好1个刀具，4个孔，直径4.000
+            if (string.IsNullOrEmpty(OriginalFilePath))
+                return;
+
+            var fileName = System.IO.Path.GetFileNameWithoutExtension(OriginalFilePath);
+            if (!fileName.EndsWith("-pp", StringComparison.OrdinalIgnoreCase))
+                return;
+
+            if (Tools.Count != 1)
+                return;
+
+            var tool = Tools[0];
+            if (tool.TotalHoles != 4 || Math.Abs(tool.Diameter - 4.000) > 0.001)
+                return;
+
+            // 解析孔位坐标
+            var points = new List<(double X, double Y)>();
+
+            foreach (var location in tool.HoleLocations)
+            {
+                var match = System.Text.RegularExpressions.Regex.Match(location, @"X([+-]?\d+)Y([+-]?\d+)");
+                if (match.Success)
+                {
+                    double x = double.Parse(match.Groups[1].Value) / 1000.0;
+                    double y = double.Parse(match.Groups[2].Value) / 1000.0;
+                    points.Add((x, y));
+                }
+            }
+
+            if (points.Count != 4)
+                return;
+
+            IsPpDrillTape = true;
+
+            // 将4个点配对为矩形的两组对边，取X跨度+Y跨度最大的方案
+            int[][][] combos = { new[] { new[] { 0, 1 }, new[] { 2, 3 } }, new[] { new[] { 0, 2 }, new[] { 1, 3 } }, new[] { new[] { 0, 3 }, new[] { 1, 2 } } };
+
+            double bestRange = -1;
+            int bestIdx = 0;
+
+            for (int i = 0; i < combos.Length; i++)
+            {
+                var a = points[combos[i][0][0]];
+                var b = points[combos[i][0][1]];
+                var c = points[combos[i][1][0]];
+                var d = points[combos[i][1][1]];
+
+                double xRange = Math.Max(Math.Abs(a.X - b.X), Math.Abs(c.X - d.X));
+                double yRange = Math.Max(Math.Abs(a.Y - b.Y), Math.Abs(c.Y - d.Y));
+                double totalRange = xRange + yRange;
+
+                if (totalRange > bestRange)
+                {
+                    bestRange = totalRange;
+                    bestIdx = i;
+                }
+            }
+
+            var p1 = points[combos[bestIdx][0][0]];
+            var p2 = points[combos[bestIdx][0][1]];
+            var p3 = points[combos[bestIdx][1][0]];
+            var p4 = points[combos[bestIdx][1][1]];
+
+            double dist1 = Math.Sqrt((p1.X - p2.X) * (p1.X - p2.X) + (p1.Y - p2.Y) * (p1.Y - p2.Y));
+            double dist2 = Math.Sqrt((p3.X - p4.X) * (p3.X - p4.X) + (p3.Y - p4.Y) * (p3.Y - p4.Y));
+
+            // 跨度更大的为X间距（上下孔），另一组为Y间距（左右孔）
+            double xSpan1 = Math.Abs(p1.X - p2.X);
+            double xSpan2 = Math.Abs(p3.X - p4.X);
+
+            if (xSpan1 >= xSpan2)
+            {
+                PpXSpacing = Math.Round(dist1, 3, MidpointRounding.AwayFromZero);
+                PpYSpacing = Math.Round(dist2, 3, MidpointRounding.AwayFromZero);
+            }
+            else
+            {
+                PpXSpacing = Math.Round(dist2, 3, MidpointRounding.AwayFromZero);
+                PpYSpacing = Math.Round(dist1, 3, MidpointRounding.AwayFromZero);
+            }
+
+            System.Diagnostics.Debug.WriteLine($"[PP钻带] X间距={PpXSpacing:F3}, Y间距={PpYSpacing:F3}");
+        }
+
         /// <summary>
         /// 测试使用参考钻带重排功能
         /// </summary>