Hi there,

i started using xamdatachart with the 2020.1 release.

our final goal is to use it with .NET5, currently this demo targets .NET core 3.1

I have created a simple chart with one series and set IsTransitionInEnabled = True.

Data is being created in the viewmodel.

What i see now when opening the app is, that it starts renedering the series. after maybe a third it resets automatically to the beginning, after that it renders completely.

what could be the reason for this.

Thanks, Thomas

my xaml:

<Window.DataContext>
<local:MainViewModel/>
</Window.DataContext>
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="20"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<ig:XamDataChart Grid.Row="1" x:Name="DataChart"
VerticalZoomable="True" HorizontalZoomable="True" Background="#FFE0DEDE" HorizontalZoombarVisibility="Visible">
<ig:XamDataChart.Axes>
<ig:CategoryXAxis x:Name="xAxis"
ItemsSource="{Binding DataItems}"
Label="{}{X}">
</ig:CategoryXAxis>
<ig:NumericYAxis x:Name="yAxis" Opacity="0">
</ig:NumericYAxis>
</ig:XamDataChart.Axes>
<ig:XamDataChart.Series>
<ig:LineSeries x:Name="Sine" MarkerType="None" Thickness="1"
ItemsSource="{Binding DataItems}"
ValueMemberPath="Y"
Resolution="0.5"
XAxis="{Binding ElementName=xAxis}"
YAxis="{Binding ElementName=yAxis}"
IsTransitionInEnabled="True"/>
</ig:XamDataChart.Series>
</ig:XamDataChart>
</Grid>

my viewmodel

public class MainViewModel : INotifyPropertyChanged
{
public MainViewModel()
{

List<ChartData> lstDataItems = new List<ChartData>();

lstDataItems = GetSineWave(1000, 100, 44100);

dataItems = lstDataItems;
}

private List<ChartData> GetSineWave(double freq, int durationMs, int sampleRate)
{
List<ChartData> lstDataItems = new List<ChartData>();

double sample_rate = 10000;
double number_of_samples = 2500;
double amplitude = 170;
double frequency_in_hz = 60;
double time_in_seconds;
double sample;

for (int sample_number = 0; sample_number < number_of_samples; sample_number++)
{
time_in_seconds = sample_number / sample_rate;
sample = amplitude * Math.Sin(2 * Math.PI * frequency_in_hz * time_in_seconds);

lstDataItems.Add(new ChartData(time_in_seconds, sample));
}

return lstDataItems;
}

public event PropertyChangedEventHandler PropertyChanged;

protected void OnPropertyChanged(string propertyName)
{
var handler = this.PropertyChanged;
if (handler != null)
handler(this, new PropertyChangedEventArgs(propertyName));
}

public List<ChartData> dataItems;
public List<ChartData> DataItems
{
set
{
dataItems = value;
this.OnPropertyChanged("DataItems");
}
get { return dataItems; }
}

}