From 6516de99375616a2bfc011bda07586da9fb98b75 Mon Sep 17 00:00:00 2001
From: sladro <sladro@163.com>
Date: Wed, 31 Dec 2025 11:21:55 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E6=94=B9=E8=87=AA=E5=8A=A8=E6=AF=94?=
 =?UTF-8?q?=E4=BE=8B?=
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---
 UI/ParamDrawingPanel.cs | 75 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 74 insertions(+), 1 deletion(-)

diff --git a/UI/ParamDrawingPanel.cs b/UI/ParamDrawingPanel.cs
index 63d0391..3d889ba 100644
--- a/UI/ParamDrawingPanel.cs
+++ b/UI/ParamDrawingPanel.cs
@@ -644,7 +644,80 @@ namespace CadParamPluging.UI
                     {
                          AppendLog($"原图中心点: {removeResult.OriginalCenter}");
                     }
-                    AppendLog($"绘图参数: Type={tplParams.ProjectType}, Size={tplParams.SheetSize}, Scale={tplParams.Scale}, Method={tplParams.DrawingType}");
+
+                    // ---------------------------------------------------------
+                    // 智能比例建议 (Pre-calculation)
+                    // ---------------------------------------------------------
+                    if (removeResult.WhiteFrameExtents.HasValue)
+                    {
+                        var frame = removeResult.WhiteFrameExtents.Value;
+                        var frameWidth = frame.MaxPoint.X - frame.MinPoint.X;
+                        var frameHeight = frame.MaxPoint.Y - frame.MinPoint.Y;
+
+                        // 1. 获取预估图形尺寸 (不含标注的纯几何尺寸 + 预留边距)
+                        var expectedSize = FeatureDrivenDrawer.CalculateExpectedSize(bag, tplParams.SheetSize);
+                        
+                        if (expectedSize.IsValid)
+                        {
+                            var currentDrawW = expectedSize.Width * scaleFactor;
+                            var currentDrawH = expectedSize.Height * scaleFactor;
+
+                            bool isOverflow = currentDrawW > frameWidth || currentDrawH > frameHeight;
+                            bool isTooSmall = currentDrawW < frameWidth * 0.3 && currentDrawH < frameHeight * 0.3;
+
+                            if (isOverflow || isTooSmall)
+                            {
+                                // 计算建议比例 (目标填充率 65%)
+                                var ratioW = frameWidth / expectedSize.Width;
+                                var ratioH = frameHeight / expectedSize.Height;
+                                var targetScale = Math.Min(ratioW, ratioH) * 0.65;
+
+                                // 格式化建议比例
+                                string suggestedScaleText;
+                                double newOneToN = 1.0 / targetScale;
+
+                                // 简单的取整逻辑，优先凑整 1:1, 1:2, 1:5, 1:10 等
+                                if (targetScale >= 0.95)
+                                {
+                                    suggestedScaleText = "1:1";
+                                    targetScale = 1.0;
+                                }
+                                else
+                                {
+                                    // 凑整到最近的 0.5 或 整数
+                                    if (newOneToN < 10)
+                                    {
+                                        newOneToN = Math.Round(newOneToN * 2) / 2.0; // 凑整 0.5
+                                    }
+                                    else
+                                    {
+                                        newOneToN = Math.Round(newOneToN); // 凑整 1
+                                    }
+                                    suggestedScaleText = $"1:{newOneToN}";
+                                    targetScale = 1.0 / newOneToN;
+                                }
+
+                                var msg = isOverflow 
+                                    ? $"当前比例 (1:{(1/scaleFactor):F1}) 会导致图形超出图纸边框。\n建议调整为 {suggestedScaleText}。\n\n是否应用建议比例？"
+                                    : $"当前比例 (1:{(1/scaleFactor):F1}) 会导致图形过小（占比<30%）。\n建议调整为 {suggestedScaleText}。\n\n是否应用建议比例？";
+
+                                var dialogResult = MessageBox.Show(this, msg, "自动比例建议", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
+                                
+                                if (dialogResult == DialogResult.Yes)
+                                {
+                                    scaleFactor = targetScale;
+                                    bag.Set("DrawingScale", suggestedScaleText); // 更新参数包中的比例字符串
+                                    AppendLog($"[自动调整] 已应用建议比例: {suggestedScaleText}");
+                                }
+                                else
+                                {
+                                    AppendLog($"[自动调整] 用户忽略了比例建议，保持原比例。");
+                                }
+                            }
+                        }
+                    }
+
+                    AppendLog($"绘图参数: Type={tplParams.ProjectType}, Size={tplParams.SheetSize}, Scale={bag.GetString("DrawingScale")}, Method={tplParams.DrawingType}");
                     
                     // Dubug: Dump bag keys
                     var bagKeys = bag.GetKeys(); // Assuming GetKeys exists? If not, skip or use reflection?