气泡测量：ROI上方显示空隙率和PASS/FAIL判定标签

XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs

@@ -375,6 +375,7 @@ namespace XP.ImageProcessing.RoiControl.Controls
         private BubbleSubTool _bubbleTool = BubbleSubTool.Roi;
         private Rectangle _bubbleRoiRect;
         private Ellipse _bubbleRoiHandle;          // 右下角调整手柄
+        private TextBlock _bubbleResultLabel;      // ROI 上方结果标签
         private Rect? _bubbleRoi;
         private Point? _bubbleRoiStart;
         private bool _bubbleRoiDragging;
@@ -1137,6 +1138,16 @@ namespace XP.ImageProcessing.RoiControl.Controls
                 };
                 _measureOverlay.Children.Add(_bubbleRoiHandle);
             }
+            if (_bubbleResultLabel == null)
+            {
+                _bubbleResultLabel = new TextBlock
+                {
+                    FontSize = 13, FontWeight = FontWeights.Bold,
+                    IsHitTestVisible = false,
+                    Visibility = Visibility.Collapsed
+                };
+                _measureOverlay.Children.Add(_bubbleResultLabel);
+            }
         }
 
         private void SyncBubbleRoiVisuals()
@@ -1256,6 +1267,17 @@ namespace XP.ImageProcessing.RoiControl.Controls
                 }
 
             double voidRate = roiArea > 0 ? voidArea * 100.0 / roiArea : 0;
+            // 更新 ROI 上方标签
+            if (_bubbleResultLabel != null)
+            {
+                string cls = voidRate <= 25.0 ? "PASS" : "FAIL";
+                _bubbleResultLabel.Text = $"Void: {voidRate:F1}% | {cls}";
+                _bubbleResultLabel.Foreground = cls == "PASS" ? Brushes.Lime : Brushes.Red;
+                Canvas.SetLeft(_bubbleResultLabel, roi.X);
+                Canvas.SetTop(_bubbleResultLabel, roi.Y - 20);
+                _bubbleResultLabel.Visibility = Visibility.Visible;
+            }
+
             RaiseMeasureCompleted(roi.TopLeft, roi.BottomRight, voidRate, 1, "BubbleVoid");
         }
 
@@ -1388,6 +1410,7 @@ namespace XP.ImageProcessing.RoiControl.Controls
             {
                 if (_bubbleRoiRect != null) { _measureOverlay.Children.Remove(_bubbleRoiRect); _bubbleRoiRect = null; }
                 if (_bubbleRoiHandle != null) { _measureOverlay.Children.Remove(_bubbleRoiHandle); _bubbleRoiHandle = null; }
+                if (_bubbleResultLabel != null) { _measureOverlay.Children.Remove(_bubbleResultLabel); _bubbleResultLabel = null; }
                 if (_bubbleMaskImage != null) { _measureOverlay.Children.Remove(_bubbleMaskImage); _bubbleMaskImage = null; }
             }
             _bubbleRoi = null;