Need help with dynamic charts (like a stock ticker)

480

Molecular Devices posted over 16 years ago

Hello,

I am working on evaluating WinCharts. I want to create a chart like a stock ticker. I am not sure how to create a chart where the data will be dynamically added. I have a created a timer tick, I know that works fine (i have used it for other charts).

THe problem I am having is with setting up the chart in such a way that we can add data points to the series every time period.

Is there a sample that I can look into? Could someone suggest a way to do this.

Thanks in advance

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17605

Teodor Taushanov posted over 16 years ago

You can try looking at:

http://forums.infragistics.com/forums/p/10614/40649.aspx

After that if you still have questions feel free to ask.
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480

Molecular Devices posted over 16 years ago in reply to Teodor Taushanov

Thanks Teodor. That helps.
The documentation I get with evals does not seem to be complete. So, I apologize for the seemingly simple questions.
How do I make the X axis scroll, such that a fixed number of data points is visible at any time.
Thanks
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17605

Teodor Taushanov posted over 16 years ago in reply to Molecular Devices

There is no such built-in functionality. To achieve this you need to change the TickmarkInterval depending on your axis scale.
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480

Molecular Devices posted over 16 years ago in reply to Teodor Taushanov

Teodor Taushanov"]There is no such built-in functionality. To achieve this you need to change the TickmarkInterval depending on your axis scale.

Are there any examples online/ in the forums that I could look into? Could you please provide more details?
Thanks
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17605

Teodor Taushanov posted over 16 years ago in reply to Molecular Devices

You can try the following code:

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();
this.ultraChart1.Axis.X.ScrollScale.Visible = true;this.ultraChart1.Axis.X.ScrollScale.Scroll = 1;
}

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;

dateTime = dateTime.AddSeconds(1);
double scale = (double)maxLabels / (double)count;
scale = Math.Min(1, scale);
scale = Math.Max(scale, 0.002);this.ultraChart1.Axis.X.ScrollScale.Scale = scale;
}

Is this that you want?
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17605

Teodor Taushanov posted over 16 years ago in reply to Molecular Devices

In this case probably is better just to use the last data values.

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;

dateTime = dateTime.AddSeconds(1);
if (count > maxLabels)
{

series.Points.RemoveAt(0);

}

}
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480

Molecular Devices posted over 16 years ago in reply to Teodor Taushanov

That is exactly what I need. Thank you so much.
Is there any way I can do this with out the scroll bar?
When I do this, chart.Axis.X.ScrollScale.Visible = false;
The scrolling stops. Once again all the datapoints seem to be visible on the screen and that gives the crowded look and after a while, things slowdown (probably due to repainting the whole thing).
I need to display hundreds on little charts on one window. Each one is really small to start with. If I add the scroll bar and the X axis for the scroll bar, the display area for the chart is reduced tremendously. These charts run for hours together, so the data accumulates over time.
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