Ticks: Labels appear and disappear on an auto-scrolling axis

Bug Report

Issue:

Currently I am trying to implement a scrolling mechanism to view live data. It differs from the example in the cookbook as the Electrocardiogram strip chart only showed a certain slice of time, and all the data was coming in at the same interval. In my case data is coming in at different intervals, in a scatter plot instead of a signal plot. In order to do the scrolling, I update the axis limits every X milliseconds. This results in a scrolling animation, but causes the axis ticks to flicker in and out.

Trying to do just AxisPan causes the X axis to grow as if it was set to AxisAuto.

Reproducing:

  // adjust the axis limits only when needed
  var axisLimits = Plot_UserControl.Plot.GetAxisLimits();
  var currentRange = (DateTime.FromOADate(axisLimits.XMax) - DateTime.FromOADate(axisLimits.XMin)).TotalSeconds;
  double slidingPercentage = 0.95;

  var currentPoint = DateTime.Now;

  var max = currentPoint.AddSeconds(currentRange * (1 - slidingPercentage));
  var min = currentPoint.AddSeconds(-currentRange * slidingPercentage);

  Plots.SetAxisLimitsX(xMin: min.ToOADate(), xMax: max.ToOADate());

System Details

• ScottPlot Version: 4.1.63?
• Operating System: Windows 10
• Application Type: WinForms
• .NET Version: .Net 6

[nassaleh]

@swharden That fixed my issue. Thank you so much!

[swharden]

@nassaleh this is an interesting effect! Does using a custom tick formatter like this help your ticks be more consistent? Notice I never call DateTimeFormat()

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        formsPlot1.Plot.XAxis.TickLabelFormat(CustomTickFormatter);
    }

    static string CustomTickFormatter(double position)
    {
        DateTime dt = DateTime.FromOADate(position);
        return $"{dt.Hour:00}:{dt.Minute:00}:{dt.Second:00}";
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        DateTime rightEdgeTime = DateTime.Now;
        double x2 = rightEdgeTime.ToOADate();
        double x1 = rightEdgeTime.AddSeconds(-20).ToOADate();
        formsPlot1.Plot.SetAxisLimitsX(x1, x2);
        formsPlot1.Refresh();
    }
}