diff --git a/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml b/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml
index 409d5d4..d5c590f 100644
--- a/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml
+++ b/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml
@@ -17,24 +17,17 @@
     </UserControl.Resources>
     <Border BorderBrush="Transparent" BorderThickness="1" ClipToBounds="True">
         <Grid>
-            <Grid.ColumnDefinitions>
-                <ColumnDefinition Width="Auto" />
-                <ColumnDefinition Width="*" />
-            </Grid.ColumnDefinitions>
-
-            <!-- 左侧控制按钮 -->
-            <Border Grid.Column="0" Background="White" Padding="5">
-                <StackPanel Orientation="Vertical" VerticalAlignment="Top">
-                    <Button x:Name="btnZoomIn" Content="+" Background="White" BorderBrush="LightGray" Width="40" Height="40" Margin="2" Click="BtnZoomIn_Click" />
-                    <Button x:Name="btnZoomOut" Content="-" Background="White" BorderBrush="LightGray" Width="40" Height="40" Margin="2" Click="BtnZoomOut_Click" />
-                    <Button x:Name="btnReset" Content="适应" Background="White" BorderBrush="LightGray" Width="40" Height="40" Margin="2" Click="BtnReset_Click" />
-                </StackPanel>
-            </Border>
-
-            <!-- 图像显示区域 -->
-            <Grid Grid.Column="1" x:Name="imageDisplayGrid" ClipToBounds="True">
+            <!-- 图像显示区域（去掉左侧按钮列，全部空间给图像） -->
+            <Grid x:Name="imageDisplayGrid" ClipToBounds="True">
+                <Grid.ContextMenu>
+                    <ContextMenu>
+                        <MenuItem Header="放大" Click="BtnZoomIn_Click" />
+                        <MenuItem Header="缩小" Click="BtnZoomOut_Click" />
+                        <MenuItem Header="适应窗口" Click="BtnReset_Click" />
+                    </ContextMenu>
+                </Grid.ContextMenu>
                 <Grid x:Name="transformGrid"
-                      RenderTransformOrigin="0,0"
+                      RenderTransformOrigin="0.5,0.5"
                       HorizontalAlignment="Center"
                       VerticalAlignment="Center">
                     <Grid.RenderTransform>
diff --git a/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs b/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs
index 669ac4d..7ac4853 100644
--- a/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs
+++ b/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs
@@ -124,6 +124,8 @@ namespace XP.ImageProcessing.RoiControl.Controls
             {
                 control.CanvasWidth = imageSource.Width;
                 control.CanvasHeight = imageSource.Height;
+                // 图像加载后自动适应窗口居中显示
+                control.ResetView();
             }
         }
 
@@ -334,39 +336,15 @@ namespace XP.ImageProcessing.RoiControl.Controls
 
         private void Canvas_MouseWheel(object sender, MouseWheelEventArgs e)
         {
-            // 获取鼠标在 imageDisplayGrid 中的位置
-            Point mousePos = e.GetPosition(imageDisplayGrid);
-
-            // 获取鼠标在 Canvas 中的位置（缩放前）
-            Point mousePosOnCanvas = e.GetPosition(mainCanvas);
-
             double oldZoom = ZoomScale;
-            double newZoom = oldZoom;
-
-            if (e.Delta > 0)
-            {
-                newZoom = oldZoom * ZoomStep;
-            }
-            else
-            {
-                newZoom = oldZoom / ZoomStep;
-            }
-
-            // 限制缩放范围
+            double newZoom = e.Delta > 0 ? oldZoom * ZoomStep : oldZoom / ZoomStep;
             newZoom = Math.Max(0.1, Math.Min(10.0, newZoom));
 
             if (Math.Abs(newZoom - oldZoom) > 0.001)
             {
-                // 计算缩放比例变化
-                double scale = newZoom / oldZoom;
-
-                // 更新缩放
                 ZoomScale = newZoom;
-
-                // 调整平移偏移，使鼠标位置保持不变
-                // 新的偏移 = 旧偏移 + 鼠标位置 - 鼠标位置 * 缩放比例
-                PanOffsetX = mousePos.X - (mousePos.X - PanOffsetX) * scale;
-                PanOffsetY = mousePos.Y - (mousePos.Y - PanOffsetY) * scale;
+                // RenderTransformOrigin="0.5,0.5" 保证以图像中心等比缩放
+                // 拖拽平移偏移保持不变
             }
 
             e.Handled = true;
@@ -414,7 +392,7 @@ namespace XP.ImageProcessing.RoiControl.Controls
         {
             // 右键点击完成多边形
             OnRightClick();
-            e.Handled = true;
+            // 不设 e.Handled，让 ContextMenu 正常弹出
         }
 
         private void ROI_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
@@ -470,6 +448,8 @@ namespace XP.ImageProcessing.RoiControl.Controls
             if (newZoom <= 10.0)
             {
                 ZoomScale = newZoom;
+                PanOffsetX = 0;
+                PanOffsetY = 0;
             }
         }
 
@@ -479,6 +459,8 @@ namespace XP.ImageProcessing.RoiControl.Controls
             if (newZoom >= 0.1)
             {
                 ZoomScale = newZoom;
+                PanOffsetX = 0;
+                PanOffsetY = 0;
             }
         }