添加实时数据功能

mseedChart.MainModule/ViewModels/ChartPlotViewModel.cs

@@ -31,6 +31,7 @@ using System.Windows.Markup;
 using System.Windows.Media;
 using System.Windows.Media.Imaging;
 using System.Windows.Threading;
+using System.Xml.Linq;
 
 namespace mseedChart.MainModule.ViewModels
 {
@@ -72,7 +73,7 @@ namespace mseedChart.MainModule.ViewModels
         public int CurPoints;
 
         int _channelCount = 0;         
-        double _samplingFrequency = 500;  // 采样频率 (Hz).
+        int _samplingFrequency = 500;  // 采样频率 (Hz).
         WavesModel _wavesModel;
         private int _lChartCount = 1;
         public ConcurrentQueue<StationModel> smList;
@@ -200,6 +201,8 @@ namespace mseedChart.MainModule.ViewModels
         public DelegateCommand<object> YasixZENVisibleCommand => new DelegateCommand<object>(YasixZENVisible);
         public DelegateCommand IntervalSureCommand => new DelegateCommand(IntervalSure);
 
+        public DelegateCommand<object> RealTimeDataCommand => new DelegateCommand<object>(RealTimeData);
+
         private void AxesYVisible(object isCheck)
         {
             if (_lChartAll != null)
@@ -370,6 +373,33 @@ namespace mseedChart.MainModule.ViewModels
                 _lChartAll.EndUpdate();
             }
         }
+
+
+        private void RealTimeData(object isCheck)
+        {
+            if (_lChartAll != null)
+            {
+                bool yAxesVisible = ((bool)isCheck == true);
+                _lChartAll.BeginUpdate();
+                if (yAxesVisible)
+                {
+
+                    //Set real-time monitoring automatic old data destruction
+                    LChartALL.ViewXY.DropOldSeriesData = true;
+                    _pointsAppended = LChartALL.ViewXY.XAxes[0].Minimum;
+                    CompositionTarget.Rendering -= CompositionTarget_Rendering;
+                    CompositionTarget.Rendering += CompositionTarget_Rendering;
+                    LChartALL.ViewXY.XAxes[0].ScrollMode = XAxisScrollMode.Scrolling;
+                }
+                else
+                {
+                    LChartALL.ViewXY.XAxes[0].ScrollMode = XAxisScrollMode.None;
+                    CompositionTarget.Rendering -= CompositionTarget_Rendering;
+                }
+
+                _lChartAll.EndUpdate();
+            }
+        }
         #endregion
         public List<StationModel> UpdateWavesFromTxt(string fn)
         {
@@ -663,6 +693,7 @@ namespace mseedChart.MainModule.ViewModels
                     multiChannelData[channelIndex * 3 + 1] = smList.ElementAt(channelIndex).dn.ToArray();
                     multiChannelData[channelIndex * 3 + 2] = smList.ElementAt(channelIndex).de.ToArray();
                 }
+                _data = multiChannelData;
                 // Invoke FeedNewDataToChart.
                 _dispatcher.Invoke(() =>
                 {
@@ -725,5 +756,91 @@ namespace mseedChart.MainModule.ViewModels
 
         }
 
+
+        #region  实时数据
+        private void CompositionTarget_Rendering(object sender, EventArgs e)
+        {
+            RenderNextFrame();
+        }
+        private void RenderNextFrame()
+        {
+            if (_lChartAll == null)
+            {
+                return;
+            }
+
+            _dispatcher.Invoke(() =>
+            {
+                FeedData(/*chartTitleText*/);
+            });
+        }
+        int _iRound = 0;
+        double _pointsAppended = 0;
+        double[][] _data;
+        int PreGenerateDataForRoundCount = 6;
+        private void FeedData(/*string chartTitleText*/)
+        {
+
+            if (_lChartAll != null)
+            {
+                _lChartAll.BeginUpdate();
+
+                //Append data to series
+                System.Threading.Tasks.Parallel.For(0, _channelCount, (seriesIndex) =>
+                {
+                    double[] thisSeriesData = _data[seriesIndex];
+                    double[] dataToAppendNow = new double[_samplingFrequency];
+                    Array.Copy(thisSeriesData, (_iRound % PreGenerateDataForRoundCount) * _samplingFrequency, dataToAppendNow, 0, _samplingFrequency);
+                    _lChartAll.ViewXY.SampleDataSeries[seriesIndex].AddSamples(dataToAppendNow, false);
+                    System.Diagnostics.Debug.WriteLine("***********index:{0}, pointCount:{1},time:{2}", seriesIndex,
+                                      _lChartAll.ViewXY.SampleDataSeries[seriesIndex].PointCount, DateTime.Now);
+                });
+                _pointsAppended += 1;
+
+                //Set X axis real-time scrolling position 
+                double lastX = _pointsAppended;
+                _lChartAll.ViewXY.XAxes[0].ScrollPosition = lastX;
+
+                //Update sweep bands
+                if (_lChartAll.ViewXY.XAxes[0].ScrollMode == XAxisScrollMode.Sweeping)
+                {
+
+                    //Dark band of old page fading away 
+                    double pageLen = _lChartAll.ViewXY.XAxes[0].Maximum - _lChartAll.ViewXY.XAxes[0].Minimum;
+                    double sweepGapWidth = pageLen / 20.0;
+                    _lChartAll.ViewXY.Bands[0].SetValues(lastX - pageLen, lastX - pageLen + sweepGapWidth);
+                    if (_lChartAll.ViewXY.Bands[0].Visible == false)
+                    {
+                        _lChartAll.ViewXY.Bands[0].Visible = true;
+                    }
+
+
+                    //Bright new page band
+                    _lChartAll.ViewXY.Bands[1].SetValues(lastX - sweepGapWidth / 6, lastX);
+                    if (_lChartAll.ViewXY.Bands[1].Visible == false)
+                    {
+                        _lChartAll.ViewXY.Bands[1].Visible = true;
+                    }
+                }
+                else
+                {
+                    //Hide sweeping bands if not in sweeping mode
+                    //if (_lChartAll.ViewXY.Bands[0].Visible == true)
+                    //{
+                    //    _lChartAll.ViewXY.Bands[0].Visible = false;
+                    //}
+
+                    //if (_lChartAll.ViewXY.Bands[1].Visible == true)
+                    //{
+                    //    _lChartAll.ViewXY.Bands[1].Visible = false;
+                    //}
+                }
+                _lChartAll.EndUpdate();
+
+                _iRound++;
+            }
+        }
+
+    #endregion
     }
 }

mseedChart.MainModule/Views/ChartPlotView.xaml

@@ -27,6 +27,7 @@
             <TextBlock VerticalAlignment="Center">X轴时间间隔:</TextBlock>
             <TextBox Text="{Binding XaisInterval}" Width="80" VerticalAlignment="Center"></TextBox>
             <Button  Grid.Column="1" Grid.Row="1" Command="{Binding IntervalSureCommand}" Margin="20,0,50,0" Background="#FF66B1FF" HorizontalAlignment="Right" Width="60">OK</Button>
+            <CheckBox Command="{Binding RealTimeDataCommand}" CommandParameter="{Binding RelativeSource={RelativeSource Mode=Self},Path=IsChecked}" Content="实时数据" VerticalContentAlignment="Center" FontSize="15" Foreground="Black"  FontWeight="Bold" DockPanel.Dock="Right"></CheckBox>
             <CheckBox IsChecked="{Binding IsMultFiles}"  Content="MultFiles" VerticalContentAlignment="Center" FontSize="15" Foreground="Black"  FontWeight="Bold" DockPanel.Dock="Right"></CheckBox>
             <Button  Grid.Column="1" Grid.Row="1" Command="{Binding FileSelectorCommand}" Margin="0,0,50,0" Background="#FF66B1FF" HorizontalAlignment="Right" Width="60">Open</Button>
         </DockPanel>