Steema Central

Posted: **Tue Apr 30, 2013 2:07 pm**

Hi,

I am working on teechart using line series to display csv file data.
My requirement is to scroll the teechart line series as they go beyond the x axis and if I move scrollviewer forward, then current line series should be shown.

I can achieve it using AxisArrow on x-axis which will result displaying left arrow and right arrow on x axis and the data can be scrolled back and forth once we click on arrow.

But I would like to have a scrollviewer down the teechart and should show the same behaviour with its mousewheel/scroll changed.
I would like to show the scrollviewer for the teechart and achieve the scrolling functionality for the teechart lines.

Please help me to solve the problem.

Thanks,
Archana

Posted: **Thu May 02, 2013 3:27 pm**

Hello Archana,

Sorry for the delay. I think you could use a similar code as All Features\Welcome !\Axes\Opaque zones. For this reason, I have made a simple code in Wpf based in this example, but using a scrollviewer. Is possible you need adjust the ScrollChange event values.

C# code

Code: Select all

        private void InitializeChart()
        {
            tChart1.Aspect.View3D = false; 
            tChart1.Series.Add(new Steema.TeeChart.WPF.Styles.FastLine()).FillSampleValues(100);
           scrollviewer1.HorizontalScrollBarVisibility = ScrollBarVisibility.Visible;
           scrollviewer1.ScrollChanged += scrollviewer1_ScrollChanged;
           tChart1.Axes.Bottom.SetMinMax(0, 50); 
        }

        void scrollviewer1_ScrollChanged(object sender, ScrollChangedEventArgs e)
        {

           double tmp = 0.01 * ((int)e.HorizontalChange-10) * (tChart1[0].XValues.Maximum - tChart1[0].XValues.Minimum);
           tChart1[0].GetHorizAxis.SetMinMax(tChart1[0].XValues.Maximum + tmp, tChart1[0].XValues.Minimum + tmp);
          
        }

xaml code

Code: Select all

   <ScrollViewer HorizontalAlignment="Left" Height="600" VerticalAlignment="Bottom" Width="800" Name="scrollviewer1">
        <WPF:TChart Height="600" Width="1000" x:Name="tChart1"/>
     
    </ScrollViewer>

Can you tell us if previous code help you achieve as you want?
Thanks,

Posted: **Fri May 03, 2013 5:13 am**

Hi Sandra,

Thank you for the reply.
In this case,Horizontal scrollviewer is applying for teechart control.
But I would like to have a scrollbar/scrollviewer for the line series in teechart control i.e., the live data(line series) flowing in teechart control should scroll back and forward on the scrolling event.

I just tried below link to achieve it.
http://www.teechart.net/support/viewtop ... f=4&t=1924

Which works for the series in teechart.

Thanks

Posted: **Fri May 03, 2013 2:00 pm**

Hello Archana,

I have modified my code because the line series does scroll. To achieve it, I have used a stackpanel with a size that is three times the size of scrollviewer. After, you only need relate the Axis bottom with scrollviewer and I achieved scrolling line with scrollviewer. I think you can do something as next:

C# MainWindow code:

Code: Select all

        public MainWindow()
        {
            InitializeComponent();
            InitializeChart();
        }
        private void InitializeChart()
        {
            scrollviewer1.VerticalScrollBarVisibility = ScrollBarVisibility.Disabled;
            scrollviewer1.HorizontalScrollBarVisibility = ScrollBarVisibility.Visible;
            Random Rnd = new Random();
            tChart1.Aspect.View3D = false;
            tChart1.Series.Add(new Steema.TeeChart.WPF.Styles.Line());
            for (int i = 0; i <= 100; i++)
                tChart1.Series[0].Add(i, Rnd.Next(100), "");
            tChart1.Axes.Bottom.SetMinMax(0, 50);
            scrollviewer1.ScrollToHorizontalOffset(0);
          
        }
        int AxisMax = 0;
        int AxisMin = 100;

        private void scrollviewer1_ScrollChanged(object sender, ScrollChangedEventArgs e)
        {
            
            if (e.HorizontalChange< 50)
                tChart1.Axes.Bottom.SetMinMax(AxisMin - (10 -e.HorizontalOffset), AxisMax - (10- e.HorizontalOffset));
            else
                tChart1.Axes.Bottom.SetMinMax(AxisMin + (e.HorizontalOffset - 10), AxisMax + (e.HorizontalOffset - 10));
            tChart1.Invalidate();
        }

Xaml MainWindow code:

Code: Select all

    <Grid Width="692.537" Margin="0,0,0,0">
        <WPF:TChart Height="451.865" Width="685" x:Name="tChart1" />
        <ScrollViewer   HorizontalAlignment="Left" Height="100" 
           Margin="0,0,0,0" VerticalAlignment="Bottom" Width="685"
            Name="scrollviewer1" 
           ScrollChanged="scrollviewer1_ScrollChanged">
            <StackPanel  Height="0" Width="2055" OverridesDefaultStyle="False" />    <!--<WPF:TChart Height="451.865" Width="685" x:Name="tChart1" />-->
        </ScrollViewer>
    </Grid>

I hope will helps.

Thanks,

Posted: **Sat May 04, 2013 9:55 am**

Hi Sandra,

I will try the code and let you know.

Thank You.

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