RT plot

OxyPlotExample/GettingStarted/MainWindow.xaml

@@ -8,7 +8,8 @@
         Title="MainWindow"
         Width="800"
         Height="450"
-        mc:Ignorable="d">
+        mc:Ignorable="d"
+        Closing="Window_Closing">
     <Grid>
         <Grid.RowDefinitions>
             <RowDefinition Height="*"/>
@@ -18,6 +19,6 @@
 
         <views:MainViewControl Grid.Row="0"/>
         <views:MainViewControl2 Grid.Row="1"/>
-        <views:MainViewControl3 Grid.Row="2"/>
+        <views:MainViewControl3 Grid.Row="2" x:Name="vcRT"/>
     </Grid>
 </Window>

OxyPlotExample/GettingStarted/MainWindow.xaml.cs

@@ -1,4 +1,5 @@
-using System.Text;
+using GettingStarted.ViewModels;
+using System.Text;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Data;
@@ -20,5 +21,11 @@ namespace GettingStarted
         {
             InitializeComponent();
         }
+
+        private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
+        {
+            if (vcRT.DataContext is MainViewModel3 vm)
+                vm.OnClosing();
+        }
     }
 }

OxyPlotExample/GettingStarted/ViewModels/MainViewModel3.cs

@@ -9,6 +9,7 @@ using System.Text;
 using System.Threading.Tasks;
 using System.Timers;
 using System.Windows;
+using OxyPlot.Axes;
 
 namespace GettingStarted.ViewModels
 {
@@ -22,25 +23,67 @@ namespace GettingStarted.ViewModels
         private LineSeries _lineSeries;
 
 
+        [ObservableProperty]
+        private double _cutOffSecond;
+
+
+
         public MainViewModel3()
         {
-            MyModel = new PlotModel() { Title = "Getting Started with RT Plot" };
+            MyModel = new PlotModel() { Title = "Getting Started with RT Plot", PlotMargins = new OxyThickness(50, 10, 50, 50) };
             LineSeries = new LineSeries() { Title = "Dynamic Data" };
 
+            DateTimeAxis timeAxis = new DateTimeAxis()
+            {
+                Position = AxisPosition.Bottom,
+                StringFormat = "HH:mm:ss",
+                Title = "Time",
+                IntervalType = DateTimeIntervalType.Seconds,
+                IntervalLength = 60,
+                IsZoomEnabled = false,
+                IsPanEnabled = false,
+            };
+            MyModel.Axes.Add(timeAxis);
+
+            LinearAxis linearAxis = new LinearAxis()
+            {
+                Position = AxisPosition.Left,
+                Title = "Value"
+            };
+            MyModel.Axes.Add(linearAxis);
+
             MyModel.Series.Add(LineSeries);
 
+            CutOffSecond = 10d;
+
             _timer = new System.Timers.Timer();
-            _timer.Interval = 50;
+            _timer.Interval = 10;
             _timer.Elapsed -= _timer_Elapsed;
             _timer.Elapsed += _timer_Elapsed;
         }
 
         private int _lastX = 0;
+        private Random _rand = new Random();
+        private double _noiseLevel = 0.3;
         private void _timer_Elapsed(object? sender, ElapsedEventArgs e)
         {
             Application.Current.Dispatcher.Invoke(() =>
             {
-                LineSeries.Points.Add(new DataPoint(_lastX, Math.Sin(_lastX * 0.1)));
+                DateTime now = DateTime.Now;
+
+                double noise = (_rand.NextDouble() - 0.5) * _noiseLevel;
+                //LineSeries.Points.Add(new DataPoint(_lastX, Math.Sin(_lastX * 0.1) + noise));
+                LineSeries.Points.Add(new DataPoint(DateTimeAxis.ToDouble(DateTime.Now), Math.Sin(_lastX * 0.1) + noise));
+                
+                DateTime cutOff = now.AddSeconds(-1 * CutOffSecond);
+                LineSeries.Points.RemoveAll(d => DateTimeAxis.ToDateTime(d.X) < cutOff);
+
+                if (MyModel.Axes[0] is DateTimeAxis timeAxis)
+                {
+                    timeAxis.Minimum = DateTimeAxis.ToDouble(cutOff);
+                    timeAxis.Maximum = DateTimeAxis.ToDouble(now);
+                }
+
                 MyModel.InvalidatePlot(true);
                 _lastX++;
             });
@@ -63,5 +106,11 @@ namespace GettingStarted.ViewModels
                 _isTimerStarted = false;
             }
         }
+
+        public void OnClosing()
+        {
+            _timer.Stop();
+            _timer.Dispose();
+        }
     }
 }