添加比例文字

Cad/TemplateDrawingService.cs

@@ -1493,5 +1493,116 @@ namespace CadParamPluging.Cad
 
             return result;
         }
+
+        /// <summary>
+        /// 更新图纸标题栏中的比例 - 查找"比例"标题文字并在其下方创建比例值文本
+        /// </summary>
+        public static bool UpdateScaleAttribute(CadContext ctx, string layoutName, bool scanModelSpace, double scaleFactor)
+        {
+            if (ctx == null)
+            {
+                return false;
+            }
+
+            var db = ctx.Database;
+            var tr = ctx.Transaction;
+
+            // 格式化比例文本
+            var scaleText = FormatScaleText(scaleFactor);
+
+            // 在ModelSpace中查找"比例"标题文字
+            var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
+            var ms = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
+
+            Point3d? scaleLabelPos = null;
+            double textHeight = 2.5;
+            string textStyle = "STANDARD";
+
+            // 遍历所有实体，查找"比例"文字
+            foreach (ObjectId id in ms)
+            {
+                var ent = tr.GetObject(id, OpenMode.ForRead, false) as Entity;
+                if (ent == null)
+                {
+                    continue;
+                }
+
+                if (ent is DBText dbText)
+                {
+                    var content = dbText.TextString?.Trim() ?? string.Empty;
+                    var contentNoSpace = content.Replace(" ", "").Replace("　", "");
+                    // 匹配：去掉空格后是"比例"
+                    if (contentNoSpace == "比例")
+                    {
+                        scaleLabelPos = dbText.Position;
+                        textHeight = dbText.Height;
+                        textStyle = dbText.TextStyleName ?? "STANDARD";
+                        break;
+                    }
+                }
+                else if (ent is MText mText)
+                {
+                    var content = mText.Contents?.Trim() ?? string.Empty;
+                    var contentNoSpace = content.Replace(" ", "").Replace("　", "");
+                    if (contentNoSpace == "比例")
+                    {
+                        scaleLabelPos = mText.Location;
+                        textHeight = mText.TextHeight;
+                        textStyle = mText.TextStyleName ?? "STANDARD";
+                        break;
+                    }
+                }
+            }
+
+            if (!scaleLabelPos.HasValue)
+            {
+                return false;
+            }
+
+            // 在"比例"文字下方创建比例值文本
+            var valuePos = new Point3d(
+                scaleLabelPos.Value.X,
+                scaleLabelPos.Value.Y - textHeight * 2.5,
+                scaleLabelPos.Value.Z
+            );
+
+            var newText = new DBText
+            {
+                Position = valuePos,
+                TextString = scaleText,
+                Height = textHeight,
+                ColorIndex = 7,
+                Layer = "0"
+            };
+            
+            // 设置文字样式
+            var textStyleTbl = (TextStyleTable)tr.GetObject(db.TextStyleTableId, OpenMode.ForRead);
+            if (textStyleTbl.Has(textStyle))
+            {
+                newText.TextStyleId = textStyleTbl[textStyle];
+            }
+
+            ms.AppendEntity(newText);
+            tr.AddNewlyCreatedDBObject(newText, true);
+
+            return true;
+        }
+
+        private static string FormatScaleText(double scaleFactor)
+        {
+            if (scaleFactor >= 0.9999 && scaleFactor <= 1.0001)
+            {
+                return "1:1";
+            }
+
+            var ratio = 1.0 / scaleFactor;
+            
+            if (Math.Abs(ratio - Math.Round(ratio)) < 0.05)
+            {
+                return $"1:{Math.Round(ratio)}";
+            }
+            
+            return $"1:{ratio:F1}";
+        }
     }
 }

UI/ParamDrawingPanel.cs

@@ -673,6 +673,22 @@ namespace CadParamPluging.UI
                         scaleFactor  // 缩放比例
                     );
 
+                    // 更新标题栏中的比例属性
+                    var scaleUpdated = TemplateDrawingService.UpdateScaleAttribute(
+                        ctx,
+                        _selectedTemplate.LayoutName,
+                        _selectedModelWindow.HasValue,
+                        scaleFactor
+                    );
+                    if (scaleUpdated)
+                    {
+                        AppendLog($"已更新标题栏比例: {(scaleFactor >= 0.9999 ? "1:1" : $"1:{(1/scaleFactor):F1}")}");
+                    }
+                    else
+                    {
+                        AppendLog("未找到标题栏中的'比例'文字，无法更新比例");
+                    }
+
                     ctx.Commit();
                 }