BGA自动检测工具:BGA检测结果以半透明图层叠加在canvas上、添加图标，统一按钮样式

XplorePlane/ViewModels/ImageProcessing/BgaDetectionViewModel.cs

@@ -94,6 +94,7 @@ namespace XplorePlane.ViewModels.ImageProcessing
 
         private PolygonRoiCanvas _canvas;
         private PolygonROI _roiShape;
+        private System.Windows.Controls.Image _resultOverlayImage;
 
         public void SetCanvas(PolygonRoiCanvas canvas)
         {
@@ -215,6 +216,43 @@ namespace XplorePlane.ViewModels.ImageProcessing
                 }
                 _canvas.SelectedROI = null;
             }
+            // 关闭面板时不清除结果叠加层，保留显示
+        }
+
+        private void ShowResultOnOverlay(BitmapSource resultBmp)
+        {
+            if (_canvas == null || resultBmp == null) return;
+
+            // 移除旧的结果图层
+            RemoveResultOverlay();
+
+            // 创建新的结果图层叠加到 canvas 上（插入到背景图之后、ROI之前）
+            _resultOverlayImage = new System.Windows.Controls.Image
+            {
+                Source = resultBmp,
+                IsHitTestVisible = false,
+                Opacity = 0.85,
+                Stretch = System.Windows.Media.Stretch.Fill
+            };
+            _resultOverlayImage.SetBinding(System.Windows.FrameworkElement.WidthProperty,
+                new System.Windows.Data.Binding("CanvasWidth") { Source = _canvas });
+            _resultOverlayImage.SetBinding(System.Windows.FrameworkElement.HeightProperty,
+                new System.Windows.Data.Binding("CanvasHeight") { Source = _canvas });
+
+            var mainCanvas = _canvas.FindName("mainCanvas") as System.Windows.Controls.Canvas;
+            if (mainCanvas != null)
+            {
+                // 插入到索引1（背景图是索引0），这样ROI和测量overlay在上面
+                int insertIndex = Math.Min(1, mainCanvas.Children.Count);
+                mainCanvas.Children.Insert(insertIndex, _resultOverlayImage);
+            }
+        }
+
+        public void RemoveResultOverlay()
+        {
+            if (_resultOverlayImage == null || _canvas == null) return;
+            _canvas.RemoveFromCanvas(_resultOverlayImage);
+            _resultOverlayImage = null;
         }
 
         private string _resultText = "结果: --";
@@ -311,9 +349,8 @@ namespace XplorePlane.ViewModels.ImageProcessing
                 // 绘制结果到图像
                 ResultImage = RenderResults(grayImage, output);
 
-                // 将结果图像推送到主界面显示
-                if (ResultImage != null)
-                    _viewportService?.SetManualImage(ResultImage, "BGA检测结果");
+                // 将结果叠加到 canvas overlay 上
+                ShowResultOnOverlay(ResultImage);
 
                 grayImage.Dispose();
             }