I tried that.   I think we are only hiding few labels when we specify TickMarkInterval.

Because same output is observed after plotting some points. The labels that are displayed based on the Interval specified, start becoming blur [ truncated top and bottom when drawn vertically] and after some more point they vanish. 

Is there a way to clear all labels and redr aw labels ?

It's little hard to reproduce this problem. Which version of our chart are you using?

I've also tried this:

public partial class Form1 : Form

this.ultraChart1.ScatterChart.ConnectWithLines = true;

this.ultraChart1.ScatterChart.IconSize = Infragistics.UltraChart.Shared.Styles.SymbolIconSize.Small;

int count = series.Points.Count;

Only difference is that I have to plot against time [ show date time as X - Axis label]

I am having problem if I have to display datavalues against time. Whatever problem I have is with Linechart displaying Date Time in X-Axis as label [ Instead of XYSeries and XYDataPoint Am using NumericTimeSeries and NumericDataPoint respectively ]

Is it possible to have Scatter chart displaying DateTime as labels...

I am using 8.1 version

In the code below I have tried to reproduce the problem

public partial class Form1 : Form

private Random rnd;

System.Windows.Forms.Timer timer1;

public Form1()

{

InitializeComponent();

rnd = new Random();

ultraChart1.ChartType = Infragistics.UltraChart.Shared.Styles.ChartType.LineChart;

ultraChart1.LineChart.TreatDateTimeAsString = true;ultraChart1.Axis.X.TickmarkStyle = Infragistics.UltraChart.Shared.Styles.AxisTickStyle.DataInterval;

ultraChart1.Axis.X.TickmarkInterval = 2;

ultraChart1.Axis.X.Labels.ItemFormatString = "<ITEM_LABEL>";

}

protected override void OnLoad(EventArgs e)

{

base.OnLoad(e);

NumericTimeSeries series = new NumericTimeSeries();

 

for (int i = 0; i <= 5; i++)

{

System.Threading.Thread.Sleep(500);NumericTimeDataPoint point = new NumericTimeDataPoint(DateTime.Now, rnd.Next(100), DateTime.Now.ToShortTimeString(), false);

series.Points.Add(point);

this.ultraChart1.Series.Add(series);

this.ultraChart1.Refresh();

}

ultraChart1.Axis.X.TickmarkInterval = 5;

 

int count = series.Points.Count;for (int i = 1; i <= count + 20; i++)

{

System.Threading.Thread.Sleep(500);

RepeatDraw();

}

ultraChart1.Axis.X.TickmarkInterval = 10;

 

timer1 = new Timer();

timer1.Interval = 100;

timer1.Tick += new EventHandler(timer1_Tick);

timer1.Start();

 

 

}

private void RepeatDraw()

{

NumericTimeSeries series = this.ultraChart1.Series[0] as NumericTimeSeries;NumericTimeDataPoint point = new NumericTimeDataPoint(DateTime.Now, rnd.Next(100), DateTime.Now.ToShortTimeString(), false);

series.Points.Add(point);

this.ultraChart1.Series.Add(series);

this.ultraChart1.Refresh();

}

private void timer1_Tick(object sender, EventArgs e)

{

 

NumericTimeSeries series = this.ultraChart1.Series[0] as NumericTimeSeries;

int count = series.Points.Count;

for (int i = 1; i <= count + 200; i++)

{

NumericTimeDataPoint point = new NumericTimeDataPoint(DateTime.Now, rnd.Next(100), DateTime.Now.ToShortTimeString(), false);

series.Points.Add(point);

this.ultraChart1.Series.Add(series);this.ultraChart1.Refresh();

 

 

}

timer1.Stop();

 

 

}

In this case the code can be something like:

public partial class Form1 : Form

private Random rnd;

this.dateTime = DateTime.Now;

this.ultraChart1.Axis.X.TickmarkIntervalType = Infragistics.UltraChart.Shared.Styles.AxisIntervalType.Seconds;

int count = series.Points.Count;

Even this did not solve my problem. You can simulate it by just copying the code below and running it for some time, say for 300 seconds..

Sorry I could not insert the output graph here.

I modified  your code to have a delay of 500ms before each draw. Because I get data from device based on a specified interval [say every second]

Also added 1 Second to dateTime after each draw.

private const int maxLabels = 15;

private Random rnd;

private DateTime dateTime;

public Form1()

{

InitializeComponent();

rnd = new Random();

}

protected override void OnLoad(EventArgs e)

{

base.OnLoad(e);

NumericTimeSeries series = new NumericTimeSeries();

this.dateTime = DateTime.Now;

this.ultraChart1.Series.Add(series);

this.ultraChart1.Axis.X.TickmarkIntervalType = Infragistics.UltraChart.Shared.Styles.AxisIntervalType.Seconds;

this.ultraChart1.Axis.X.TickmarkStyle = Infragistics.UltraChart.Shared.Styles.AxisTickStyle.DataInterval;

System.Windows.Forms.Timer timer1 = new Timer();

timer1.Interval = 500;

timer1.Tick +=new EventHandler(timer1_Tick);

timer1.Start();

}

private void timer1_Tick(object sender, EventArgs e)

{

NumericTimeSeries series = this.ultraChart1.Series[0] as NumericTimeSeries;

NumericTimeDataPoint dataPoint = new NumericTimeDataPoint(this.dateTime, rnd.Next(100), dateTime.ToString(), false);

series.Points.Add(dataPoint);

int count = series.Points.Count;

this.ultraChart1.Axis.X.TickmarkInterval = count / maxLabels;

dateTime = dateTime.AddSeconds(1);

}

It worked.

Thanks a lot.

Regards

sanms 

You can try adding the following line:

this.ultraChart1.Axis.X.Labels.Layout.Behavior = Infragistics.UltraChart.Shared.Styles.AxisLabelLayoutBehaviors.None;