I created the simple application. It creates collection of some objects and displays them using RadChart.
Here is the source code:

    public partial class MainPage : UserControl
    {
        private ObservableCollection<ChartEntry> m_ChartEntries;
 
        public MainPage()
        {
            InitializeComponent();
 
            m_ChartEntries = new ObservableCollection<ChartEntry>();
            for (int i = 0; i < 20; i++)
            {
                m_ChartEntries.Add(new ChartEntry { XValue = i, YValue = 10 });
                m_ChartEntries.Add(new ChartEntry { XValue = i + 0.5, YValue = 20 });
            }
 
            radChart.ItemsSource = m_ChartEntries;
 
            radChart.DefaultView.ChartArea.AxisX.AutoRange = false;
            radChart.DefaultView.ChartArea.AxisX.MinValue = 1;
            radChart.DefaultView.ChartArea.AxisX.MaxValue = m_ChartEntries.Count;
            radChart.DefaultView.ChartArea.AxisX.Step = 1; // The Step is 1
        }
    }

The data are displayed correctly and Step is 1 (please note that AutoRange=false and Step is specified).

Afterwards I tried to add horizontal scroll bar. I added the next code:

            radChart.DefaultView.ChartArea.ZoomScrollSettingsX.RangeStart = 0;
            radChart.DefaultView.ChartArea.ZoomScrollSettingsX.RangeEnd = 0.25;
            radChart.DefaultView.ChartArea.ZoomScrollSettingsX.ScrollMode = ScrollMode.ScrollOnly;

After adding scroll bar I have found the problem - now the data are displayed with the step 0.5 (please see the attached file). Why? How to solve this problem?

Many thanks.

Hi Bolik,

RadChart scales the step when it is zoomed in/out, so that the number of items along X axis remains reasonable. In order to avoid this behavior in this case you can set the Step property directly to 4.

Best regards,
Ves
the Telerik team