diff --git a/Windows/CS/Framework4.0/Toprie/Toprie/Setting.cs b/Windows/CS/Framework4.0/Toprie/Toprie/Setting.cs
index be3130d..c90ba71 100644
--- a/Windows/CS/Framework4.0/Toprie/Toprie/Setting.cs
+++ b/Windows/CS/Framework4.0/Toprie/Toprie/Setting.cs
@@ -1267,33 +1267,83 @@ namespace JoyD.Windows.CS
                     // 获取相对于图像的当前坐标
                     Point currentImagePoint = ControlPointToImagePoint(e.Location);
                     
-                    // 计算矩形参数
-                    int x = Math.Min(_rectangleStartPoint.X, currentImagePoint.X);
-                    int y = Math.Min(_rectangleStartPoint.Y, currentImagePoint.Y);
-                    int width = Math.Abs(currentImagePoint.X - _rectangleStartPoint.X);
-                    int height = Math.Abs(currentImagePoint.Y - _rectangleStartPoint.Y);
+                    // 计算矩形参数：左上点是起笔方块的左上点，右下点是收笔方块的右下点
+                    int x = _rectangleStartPoint.X;
+                    int y = _rectangleStartPoint.Y;
+                    int width = currentImagePoint.X - _rectangleStartPoint.X;
+                    int height = currentImagePoint.Y - _rectangleStartPoint.Y;
+                    
+                    // 确保矩形大小为正数，调整起点和大小
+                    if (width < 0)
+                    {
+                        x += width;
+                        width = -width;
+                    }
+                    if (height < 0)
+                    {
+                        y += height;
+                        height = -height;
+                    }
+                    
                     Rectangle rect = new Rectangle(x, y, width, height);
                     
-                    // 创建临时位图用于双重缓冲，避免闪烁
-                    using (Bitmap tempBitmap = new Bitmap(_tempDiffOverlayImage))
-                    {                         
-                        using (Graphics g = Graphics.FromImage(tempBitmap))
-                        {                             
-                            g.SmoothingMode = SmoothingMode.AntiAlias;
-                            g.InterpolationMode = InterpolationMode.HighQualityBicubic;
-                            
-                            if (_isEraseMode)
-                            {                                 
-                                // 擦除模式：显示虚线预览框，不实际擦除（等待MouseUp时再擦除）
+                    // 对于擦除模式，在临时层上绘制预览框，不影响实际的温差图
+                    if (_isEraseMode)
+                    {   
+                        // 创建临时缓冲区用于绘制预览
+                        Bitmap bufferBitmap = null;
+                        try
+                        {   
+                            bufferBitmap = new Bitmap(picBoxTemp.Width, picBoxTemp.Height);
+                            using (Graphics g = Graphics.FromImage(bufferBitmap))
+                            {   
+                                // 绘制背景图像
+                                if (picBoxTemp.Image != null)
+                                {   
+                                    g.DrawImage(picBoxTemp.Image, 0, 0, picBoxTemp.Width, picBoxTemp.Height);
+                                }
+                                
+                                // 绘制温差层
+                                if (_tempDiffOverlayImage != null)
+                                {   
+                                    g.DrawImage(_tempDiffOverlayImage, 0, 0, picBoxTemp.Width, picBoxTemp.Height);
+                                }
+                                
+                                // 绘制虚线预览框
                                 using (Pen dashPen = new Pen(Color.White, 1))
-                                {
+                                {   
                                     dashPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;
-                                    g.DrawRectangle(dashPen, rect);
+                                    // 将图像坐标转换为控件坐标
+                                    Rectangle controlRect = ImageRectangleToControlRectangle(rect);
+                                    g.DrawRectangle(dashPen, controlRect);
                                 }
                             }
-                            else
-                            {                                 
-                                // 普通绘制模式：使用半透明填充和边框
+                            
+                            // 直接在控件上绘制缓冲区内容
+                            using (Graphics g = picBoxTemp.CreateGraphics())
+                            {   
+                                g.DrawImage(bufferBitmap, 0, 0);
+                            }
+                            
+                            // 防止闪烁
+                            return;
+                        }
+                        finally
+                        {   
+                            if (bufferBitmap != null)
+                                bufferBitmap.Dispose();
+                        }
+                    }
+                    else
+                    {   
+                        // 普通绘制模式：使用半透明填充和边框
+                        using (Bitmap tempBitmap = new Bitmap(_tempDiffOverlayImage))
+                        {                          
+                            using (Graphics g = Graphics.FromImage(tempBitmap))
+                            {                              
+                                g.SmoothingMode = SmoothingMode.AntiAlias;
+                                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
+                                
                                 // 创建半透明的填充颜色
                                 Color fillColor = Color.FromArgb(128, selectedColor);
                                 
@@ -1302,16 +1352,16 @@ namespace JoyD.Windows.CS
                                 
                                 // 绘制矩形边框
                                 using (Pen pen = new Pen(selectedColor, _currentBrushSize))
-                                {                                     
+                                {                                      
                                     g.DrawRectangle(pen, rect);
                                 }
                             }
-                        }
-                        
-                        // 将临时位图复制回温差层图像
-                        using (Graphics g = Graphics.FromImage(_tempDiffOverlayImage))
-                        {                             
-                            g.DrawImage(tempBitmap, 0, 0);
+                            
+                            // 将临时位图复制回温差层图像
+                            using (Graphics g = Graphics.FromImage(_tempDiffOverlayImage))
+                            {                              
+                                g.DrawImage(tempBitmap, 0, 0);
+                            }
                         }
                     }
                     
@@ -1698,11 +1748,24 @@ namespace JoyD.Windows.CS
                         // 获取相对于图像的当前坐标
                         Point currentImagePoint = ControlPointToImagePoint(e.Location);
                         
-                        // 计算矩形参数
-                        int x = Math.Min(_rectangleStartPoint.X, currentImagePoint.X);
-                        int y = Math.Min(_rectangleStartPoint.Y, currentImagePoint.Y);
-                        int width = Math.Abs(currentImagePoint.X - _rectangleStartPoint.X);
-                        int height = Math.Abs(currentImagePoint.Y - _rectangleStartPoint.Y);
+                        // 计算矩形参数：左上点是起笔方块的左上点，右下点是收笔方块的右下点
+                        int x = _rectangleStartPoint.X;
+                        int y = _rectangleStartPoint.Y;
+                        int width = currentImagePoint.X - _rectangleStartPoint.X;
+                        int height = currentImagePoint.Y - _rectangleStartPoint.Y;
+                        
+                        // 确保矩形大小为正数，调整起点和大小
+                        if (width < 0)
+                        {
+                            x += width;
+                            width = -width;
+                        }
+                        if (height < 0)
+                        {
+                            y += height;
+                            height = -height;
+                        }
+                        
                         Rectangle rect = new Rectangle(x, y, width, height);
                         
                         // 只有当矩形有实际大小时才执行擦除