ViewModels/PoreDistributionViewModel.cs

@@ -114,16 +114,28 @@ namespace MembranePoreTester.ViewModels
                     flow = Math.Round(ConvertFlowByMode(rawFlow), 2);
                 }
 
-
+                if (pressure <= 0 || flow <= 0)
+                    return;
                 CurrentFlow = flow;
-                // 3. 直接新增一行（不查找相同压力）
-                var newPoint = new Models.DataPoint
+                // 3. 查找是否已有相同压力点（按两位小数匹配），有则更新对应流量，否则新增
+                var existing = Record.DataPoints.FirstOrDefault(p => Math.Abs(p.Pressure - pressure) < 0.001);
+                if (existing != null)
                 {
-                    Pressure = pressure,
-                    WetFlow = TestMode.Contains("湿膜") ? flow : 0,
-                    DryFlow = TestMode.Contains("干膜") ? flow : 0
-                };
-                Record.DataPoints.Add(newPoint);
+                    if (TestMode != null && TestMode.Contains("湿膜"))
+                        existing.WetFlow = flow;
+                    else
+                        existing.DryFlow = flow;
+                }
+                else
+                {
+                    var newPoint = new Models.DataPoint
+                    {
+                        Pressure = Math.Round(pressure, 2),
+                        WetFlow = TestMode != null && TestMode.Contains("湿膜") ? flow : 0,
+                        DryFlow = TestMode != null && TestMode.Contains("干膜") ? flow : 0
+                    };
+                    Record.DataPoints.Add(newPoint);
+                }
 
                 // 4. 刷新曲线
                 UpdatePlot();
@@ -732,7 +744,14 @@ namespace MembranePoreTester.ViewModels
         public string TestMode
         {
             get => _testMode;
-            set => SetProperty(ref _testMode, value);
+            set
+            {
+                if (SetProperty(ref _testMode, value))
+                {
+                    // 切换测试模式时刷新曲线显示（显示对应模式的历史数据）
+                    UpdatePlot();
+                }
+            }
         }
 
 
@@ -785,6 +804,9 @@ namespace MembranePoreTester.ViewModels
                 TitleFontWeight = 1
             };
 
+            // 让线条更平滑：使用线性插值（OxyPlot 默认即可），同时关闭区域填充等
+            model.DefaultColors = new[] { OxyColors.Blue, OxyColors.Red };
+
 
 
             // 添加坐标轴
@@ -799,41 +821,56 @@ namespace MembranePoreTester.ViewModels
             {
                 Position = AxisPosition.Left,
                 Title = "流量 (L/min)",
-                TitleFontSize = 12
+                TitleFontSize = 12,
+                Minimum = 0, // 从0开始绘制，避免覆盖整个Y轴
+                MajorGridlineStyle = LineStyle.Solid,
+                MinorGridlineStyle = LineStyle.Dot
             });
 
             // 湿膜流量 - 使用更清晰的标题
             var wetSeries = new LineSeries
             {
-                Title = "● 湿膜流量 (Wet Flow)",
+                Title = "湿膜流量 (Wet Flow)",
                 Color = OxyColors.Blue,
-                MarkerType = MarkerType.Circle,
-                MarkerSize = 4,
-                MarkerStroke = OxyColors.Blue,
-                MarkerFill = OxyColors.Blue,
-                StrokeThickness = 2
+                MarkerType = MarkerType.None,
+                StrokeThickness = 1
             };
 
             // 干膜流量 - 使用更清晰的标题
             var drySeries = new LineSeries
             {
-                Title = "▲ 干膜流量 (Dry Flow)",
+                Title = "干膜流量 (Dry Flow)",
                 Color = OxyColors.Red,
-                MarkerType = MarkerType.Triangle,
-                MarkerSize = 5,
-                MarkerStroke = OxyColors.Red,
-                MarkerFill = OxyColors.Red,
-                StrokeThickness = 2
+                MarkerType = MarkerType.None,
+                StrokeThickness = 1
             };
 
+            // 始终按记录填充两个序列（保留历史数据），但只在当前测试模式下将对应序列添加到图表
             foreach (var dp in sorted)
             {
                 wetSeries.Points.Add(new OxyPlot.DataPoint(dp.Pressure, dp.WetFlow));
                 drySeries.Points.Add(new OxyPlot.DataPoint(dp.Pressure, dp.DryFlow));
             }
 
-            model.Series.Add(wetSeries);
-            model.Series.Add(drySeries);
+            // 根据当前 TestMode 决定显示哪条曲线，切换回另一种模式时其历史数据会从 Record 恢复并显示
+            if (TestMode != null && TestMode.Contains("湿膜"))
+            {
+                if (wetSeries.Points.Count > 0)
+                    model.Series.Add(wetSeries);
+            }
+            else if (TestMode != null && TestMode.Contains("干膜"))
+            {
+                if (drySeries.Points.Count > 0)
+                    model.Series.Add(drySeries);
+            }
+            else
+            {
+                // 如果没有明确模式，默认显示两条曲线（适用于同时显示的情况）
+                if (wetSeries.Points.Count > 0)
+                    model.Series.Add(wetSeries);
+                if (drySeries.Points.Count > 0)
+                    model.Series.Add(drySeries);
+            }
 
             lock (_plotLock)
             {