Hi RomBe,
disregard my 2nd question.
My approach goes like this:
Instead of feeding the Graph with data every time the DAQ has something new aquired (I still save the complete data as TDMS), I have a background thread that wakes every 200ms where a copy of the current DaqTaskComponent.Data array gets saved in an identical data structure(downsampledData), which is bound to the Graph.
The displayed value is always ZERO, but according to the debugger it isnt.
Binding the original DaqTaskComponent.Data is working correctly (but awefully slow)
Comparison DownsampleData<>TaskData
XAML
<ni:Graph x:Name="_graph" RenderMode="Raster" Margin="20,0,22,20" SuppressScaleLayout="True" Background="LightGray" Canvas.Left="418" Canvas.Top="121" Width="401" Height="287" DataSource="{Binding}" UseLayoutRounding="False" >
<ni:Graph.Plots>
<ni:Plot Label="plot1" Name="plot1"/>
</ni:Graph.Plots>
<ni:Graph.Axes>
<ni:AxisInt32 x:Name="xScale" Orientation="Horizontal" Label="Time [ms]" LabelOrientation="Natural" Range="0,1000" />
<ni:AxisDouble x:Name="yScale" Orientation="Vertical" Adjuster="None" Visibility="Visible" Range="-10, 10" Label="Amplitude [V]" MinorDivisions="{x:Null}" MajorGridLines="{x:Null}"/>
</ni:Graph.Axes>
</ni:Graph>
Code: Working standard variante (DaqTaskComponent.Data)
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged(String info)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(info));
}
}
public AnalogWaveform<double>[] FillGraph
{
get { return taskComponent.data; }
set
{
if (value != taskComponent.data)
{
value = taskComponent.data;
OnPropertyChanged("FillGraph");
}
}
}
void buttonDAQ_StartClick(object sender, RoutedEventArgs e)
{
taskComponent.StartRead();
_graph.DataSource = FillGraph;
}
Code: (downsampled.Data), Graph displays just 0
AnalogWaveform<double>[] downsampledData;
downsampledData = new AnalogWaveform<double>[DAQ_CHANNELS];
for (int i = 0; i < DAQ_CHANNELS; i++)
{
downsampledData[i] = new AnalogWaveform<double>(DaqConfig.samplesPerChannel);
}
private void PlotGraph()
{
for (int i = 0; i < DAQ_CHANNELS; i++)
{
downsampledData[i] = taskComponent.data[i];
}
Thread.Sleep(250);
}
public AnalogWaveform<double>[] FillGraph //
{
get { return downsampledData; }
set
{
if (value != downsampledData)
{
value = downsampledData;
OnPropertyChanged("FillGraph");
}
}
}
void buttonDAQ_StartClick(object sender, RoutedEventArgs e)
{
taskComponent.StartRead();
_graph.DataSource = FillGraph;
Thread.tTimer = new Thread(PlotGraph);
Thread.tTimer.Start();
}
I cut some minor stuff to the code so it doesnt compile correctly, if need to look something else up, I attached the project. (sorry about the mess, but its just a test project )
