Steema Central

Hi.
We have an error in the TeeChart.WPF.dll (Height must be non-negative) in our project
when we are trying save the chart to memory stream.
Can you help with it?

Hello,

the following code works as expected:
could you please modify the above code so I can reproduce your issue here?

I am sending the code with an error.

MainWindow.xaml
<Window x:Class="TeeChart.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006 ... esentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/marku ... ility/2006"
xmlns:local="clr-namespace:TeeChart"
xmlns:wpf="clr-namespace:Steema.TeeChart.WPF;assembly=TeeChart.WPF"
mc:Ignorable="d"
Title="MainWindow" Height="500" Width="800">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<wpf:TChart Name="tChart" Grid.Row="0"/>
<StackPanel Orientation="Horizontal" Grid.Row="1" HorizontalAlignment="Center">
<Button x:Name="BtnGetImage" Click="BtnGetImage_OnClick" Margin="5">Save chart to memory stream</Button>
</StackPanel>
</Grid>
</Window>

MainWindow.xaml.cs

public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
this.Loaded += MainWindow_Loaded;
}

private void MainWindow_Loaded(object sender, RoutedEventArgs e)
{
tChart.Series.Clear();
tChart.Axes.Custom.Clear();

tChart.Width = 731;
tChart.Height = 448;
tChart.Axes.Bottom.SetMinMax(0, 12);

AddFirstTwoSeries();

var mySeries = SetMySeries();


SetDataMySeries(mySeries);

AddCustomAxes(mySeries);
}

private void AddCustomAxes(Series mySeries)
{
Steema.TeeChart.WPF.Axis newAxis = new Steema.TeeChart.WPF.Axis();
newAxis.Horizontal = false;
Steema.TeeChart.WPF.Axis customAxis = tChart.Axes.Custom.Add(newAxis);

mySeries.CustomVertAxis = customAxis;
var customAxisId = tChart.Axes.Custom.IndexOf(customAxis);

var myCustomAxis = tChart.Axes.Custom[customAxisId];
myCustomAxis.Visible = true;
myCustomAxis.AxisPen.Color = mySeries.Color;
myCustomAxis.MinorGrid.Visible = false;
myCustomAxis.Labels.Font.Color = mySeries.Color;
myCustomAxis.Labels.Font.Bold = false; //True
myCustomAxis.Ticks.Visible = false;
myCustomAxis.MinorTicks.Visible = false;
myCustomAxis.MinorGrid.Visible = false;
myCustomAxis.Grid.Visible = false;
myCustomAxis.AxisPen.Visible = false;
myCustomAxis.Increment = 1;

myCustomAxis.Labels.ValueFormat = "###0.###";

myCustomAxis.Automatic = false;
myCustomAxis.Maximum = (double) 10;
myCustomAxis.Minimum = (double) 0;

myCustomAxis.PositionUnits = Steema.TeeChart.WPF.PositionUnits.Percent;

myCustomAxis.RelativePosition = 0;
}

private static void SetDataMySeries(Series mySeries)
{
mySeries.Title = "Di";
mySeries.Legend.Visible = true;

mySeries.Add(2, (double)2, " 1", Colors.Blue);
mySeries.Add(3, (double)12, " 2", Colors.Blue);
}

private Series SetMySeries()
{
Steema.TeeChart.WPF.Styles.Series series3 = tChart.Series.Add(new Steema.TeeChart.WPF.Styles.Line(tChart.Chart));
var seriesIndex = tChart.Series.IndexOf(series3);

var mySeries = tChart.Series[seriesIndex];
((Steema.TeeChart.WPF.Styles.Line) mySeries).Pointer.Style =
(Steema.TeeChart.WPF.Styles.PointerStyles) 0;
((Steema.TeeChart.WPF.Styles.Line) mySeries).Pointer.Visible = true;

((Steema.TeeChart.WPF.Styles.Line) mySeries).LinePen.Visible = false;
return mySeries;
}

private void AddFirstTwoSeries()
{
tChart.Series.Add(new Steema.TeeChart.WPF.Styles.Line(tChart.Chart));

tChart.Series[0].VertAxis = Steema.TeeChart.WPF.Styles.VerticalAxis.Left;
tChart.Series[0].Legend.Visible = false;

tChart.Series.Add(new Steema.TeeChart.WPF.Styles.Line(tChart.Chart));
tChart.Series[1].VertAxis = Steema.TeeChart.WPF.Styles.VerticalAxis.Right;
tChart.Series[1].Legend.Visible = false;
}

private void BtnGetImage_OnClick(object sender, RoutedEventArgs e)
{
var xamlFormat = new XAMLFormat(tChart.Chart);
using (MemoryStream ms = new MemoryStream())
{
try
{
xamlFormat.Save(ms);
MessageBox.Show("Ok", "Saving chart to memory stream");
}
catch (Exception ex)
{
Console.WriteLine(ex);
MessageBox.Show($" {ex.Message}", "Error when saving chart to memory stream ");
}
}
}
}

Hello,

Thank you. I have been able to reproduce this error and have added it to our issue-tracking software with id=1857. As you can see, this issue has now been fixed.

A workaround is to make sure that there are no points outside of the minimum and maximum axes ranges when exporting to XAML. In your code example you could do this by adding in a loop to delete the points outside of the maximum left axis range in the AddCustomAxes method, e.g.