find out X and Y pos of labels

[Werner]

Hi!

Is it possible to find out X and Y position of all labels before drawing?

The only point I know is Bottom_GetAxisDrawLabel and there you can only get one xy-position at a time.

I need this to check for overlapping labels.

Nice regards
Werner

[Narcís]

Hi Werner,

Yes, for that you need to use custom labels and use them as shown here:

Code: Select all

		private void tChart1_GetAxisLabel(object sender, Steema.TeeChart.GetAxisLabelEventArgs e)
		{
			Steema.TeeChart.AxisLabelItem CustLabel = tChart1.Axes.Bottom.Labels.Items[e.ValueIndex];
			CustLabel.Left=0;
			CustLabel.Top=0;
		}

[Werner]

Hey Narcis!

Are you sure this works for ASP.NET pages as well?

At my program e.ValueIndex is -1 and
WebChart.Chart.Axes.Bottom.Labels.Items[0].Left is 0.

Any other ideas?

Werner

[Narcís]

Hi Werner,

Yes, this is because e.ValueIndex is only for standard labels. For positioning custom labels GetAxisLabel is not necessary, you should add them as shown in the snippet below and place them on the chart according to previous labels positions and using Top, Left, Width and Height properties.

Code: Select all

		private void Page_Load(object sender, System.EventArgs e)
		{
			WebChart1.Chart.Series[0].FillSampleValues();

			WebChart1.Chart.Axes.Left.Labels.Items.Clear();

//			Add custom labels like this:
			Steema.TeeChart.AxisLabelItem a = WebChart1.Chart.Axes.Left.Labels.Items.Add(-100);
			a.Transparent=false;
			a.Color=Color.Blue;
			a.Transparency=50;

//			Do the overlapping calculation here and position the labels accordingly 
//			using the properties below
//			a.Top=;
//			a.Left=;
//			a.Width=;
//			a.Height=;
		}

[Werner]

Ahh. Now - finally - we are getting there.
Why did it take so long to get this across????

I'll try this and get back to you, if I still have troubles.

Cheers for the info
Werner

[Werner]

If I do

Steema.TeeChart.AxisLabelItem label = WebChartProdukt.Chart.Axes.Bottom.Labels.Items.Add(nr,bez);
db.log.WriteDebug("Neue LabelPos: "+label.Left+"/"+label.Top);

label.Left and label.Top is still zero.

Is there supposed to be a value set if I add the label as done above?

Regards
Werner

[Narcís]

Hi Werner,

No, it works when this is implemented after the chart is drawn. To force the chart being repainted the bitmap trick below is necessary:

Code: Select all

		private void Button1_Click(object sender, System.EventArgs e)
		{
			Bitmap bmp = WebChart1.Chart.Bitmap();
			for (int i=0;i<WebChart1.Chart.Axes.Left.Labels.Items.Count;++i)
			{
				Steema.TeeChart.AxisLabelItem Current = WebChart1.Chart.Axes.Left.Labels.Items[i];
				Label1.Text=Label1.Text+" "+Current.Left.ToString()+"/"+Current.Top.ToString();
			}
		}

[Werner]

What do you want me to do?

I did

Code: Select all

Steema.TeeChart.AxisLabelItem label = WebChartProdukt.Chart.Axes.Bottom.Labels.Items.Add(nr,bez);
Bitmap bmp = WebChartProdukt.Chart.Bitmap();
db.log.WriteDebug("Neue LabelPos: "+label.Left+"/"+label.Top);

And label.Left and label.Top is still zero.
Are you just guessing or do you know a solution to my problem?

Again I am angry, because I don't get proper support.
What's the matter?

Werner

[Narcís]

Hi Werner,

In the routine where do you implement the overlapping labels code you should treat labels as I did:

Code: Select all

         Bitmap bmp = WebChart1.Chart.Bitmap(); 
         for (int i=0;i<WebChart1.Chart.Axes.Left.Labels.Items.Count;++i) 
         { 
            Steema.TeeChart.AxisLabelItem Current = WebChart1.Chart.Axes.Left.Labels.Items[i]; 
//Do the overlapping check here
            Label1.Text=Label1.Text+" "+Current.Left.ToString()+"/"+Current.Top.ToString(); 
         } 

The code I pasted in my previous message works fine here using the latest TeeChart for .NET v2 release available at our customer download area.

[Werner]

I got a solution. Puuuh that was kind of hard.

I put the Bitmap bmp = WebChart1.Chart.Bitmap();
in the seperate function where I check for overlapping labels.

Now it works.
Mysterious that it did not work before, when I repainted it right after inserting it. Shoulda be kind of the same.

Anyway, it works now.
Thanks for giving me hints now and then.

Nice regards
Werner

[Werner]

You have to call this

Code: Select all

Bitmap bmp = WebChart1.Chart.Bitmap();

to get WebChartProdukt_GetBottomAxisDrawLabel called before all labels are drawn.

And this did the trick to check for overlapping labels.

I hope this would be of any help to anybody.

Nice regards
Werner