Point Not Displayed

[avatar]

Hi TeeChart

I am plotting data by month. If the data is continuous teechart.net joins the points if there is no data the plot shows a break. I have just had a case where there is data for months 1 to 5 nothing for 6 and 7 then data for 8, 9 and nothing for 10 and 11 and one point for 12. The point does not show for 12. It is not a line because it does not connect to anything. I ran the same data thought my old teechart activex program and it displays a point without the code doing anything special. I searched the help but don’t know what to call what I am looking for. How do I display a point for a line plot if the breaks are set to Color.Transparent?

Thanks

[Christopher]

Hi,

Which version of TeeChart for .NET are you using?

Using the latest publicly available version, the following works OK here:

Code: Select all

		private void Form2_Load(object sender, System.EventArgs e)
		{
			this.points1.Add(1);
			this.points1.Add(2);
			this.points1.Add(3);
			this.points1.Add(4);
			this.points1.Add(5);
			this.points1.Add(0, Color.Transparent);
			this.points1.Add(0, Color.Transparent);
			this.points1.Add(8);
			this.points1.Add(9);
			this.points1.Add(0, Color.Transparent);
			this.points1.Add(0, Color.Transparent);
			this.points1.Add(12);
		}

[avatar]

I see the new relealse I will install it today

Try the above with a line. The last point shows in the legend but not on the chart.

Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
Line1.Add(1)
Line1.Add(2)
Line1.Add(3)
Line1.Add(4)
Line1.Add(5)
Line1.Add(0, Color.Transparent)
Line1.Add(0, Color.Transparent)
Line1.Add(8)
Line1.Add(9)
Line1.Add(0, Color.Transparent)
Line1.Add(0, Color.Transparent)
Line1.Add(12)
End Sub
thanks

[Narcís]

Hi avatar,

This only happens with line series and is because to draw a line you need 2 points. As the last point doesn't have a previous one no line can be drawn. Id you add an additional point to the series, as shown below, the last line segment will be drawn.

Code: Select all

		private void Form1_Load(object sender, System.EventArgs e)
		{
			line1.Add(1); 
			line1.Add(2); 
			line1.Add(3); 
			line1.Add(4); 
			line1.Add(5); 
			line1.Add(0, Color.Transparent); 
			line1.Add(0, Color.Transparent); 
			line1.Add(8); 
			line1.Add(9); 
			line1.Add(0, Color.Transparent); 
			line1.Add(0, Color.Transparent); 
			line1.Add(12); 
			line1.Add(13); //Additional point
		}

[avatar]

Hi Narcis,

The TeeChart Activex would display a tick in the same situation. Also if you say to mark every 10th data point the counter would reset after every break in the line. This accounts for all the data. What you are saying is to write code to add bad data to the plot for any single point before and after using Color.Transparent.

I am not just displaying data in my app. The user interacts with that data for an engineering analysis. Do you have another approach. I have displayed the line with points ‘smalldot’ and this works for all points except the last one. It also makes the stairs line look funny.

Thanks

[Narcís]

Hi avatar,

I've tested that and the difference between VCL and ActiveX versions and .NET is that when making the series pointer visible the last point is not visible in .NET. Can you confirm this is your problem?

Thanks in advance.

[avatar]

Hi Narcís

Yes that is true. The last point will not display. I was going to spend today to see if it was something in my code.
Thanks

[Narcís]

Hi avatar,

Thanks for your feedback.

Then this is a TeeChart for .NET bug. I'm going to add it to our defect list to be fixed for future releases.

[avatar]

Hi Narcís

I can not tell you how I have done this, but now there is a series terminator that is always showing the last point. Unfortunately it is a rectangle. If I could change it to smalldot I would have a solution.

I have come across protected fields Steema.TeeChart.Styles.Series.AllowSinglePoint and Steema.TeeChart.Styles.Series.lastVisible. I can find no examples or other references to these field but I think it is what I am Looking for. What do I have to do so Steema.TeeChart.Styles.Series.AllowSinglePoint is True.

And Steema.TeeChart.Styles.Series.lastVisible is smalldot

Thanks

[Christopher]

Hi -

I've had a look at this issue and have fixed the defect for the next debug release. In the meantime I haven't been able to find a workaround for you, although I would be willing to look at any code you have which works partially for you.

[GFoundries]

Hi,

I see that same problem with java. The last (single) point in the line series after a set of transparent points, is not drawn. Can you please apply the fix in the java version as well.

Thanks,
Ram

[Narcís]

Hi Ram,

I've been able to reproduce this with the Java version and added the issue to the defect list (TJ71014617) to be investigated ASAP.