去掉图像显示区的放大、缩小、适应按钮；改为鼠标右键弹出选择菜单

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;
             }
         }