Donut Chart Annotation

[rpt]

donut.png (24.17 KiB) Viewed 20739 times

Here is my code - https://github.com/dekajp/DealViewChartApp

https://github.com/dekajp/DealViewChart ... er.cs#L564

[Christopher]

Hello,

Many thanks for the links to your code, however, it is not clear to me what your issue is here, or what you would like to achieve. Would you please be so kind as to explain what you would like to see on the Chart?

[rpt]

I am sorry , I am not able to position "sample" in center of doughnut

[Christopher]

Hello,

No problem, thank you - you can get this to work with:

Code: Select all

      Steema.TeeChart.Tools.Annotation tAnnot = new Annotation(chart);
      tChart1.Tools.Add(tAnnot);
      tAnnot.Text = "Sample";
      tAnnot.Shape.Transparent = true;
      tAnnot.Shape.Font.Size = 25;

      tAnnot.Shape.CustomPosition = true;
      tChart1.Draw();

      tAnnot.Shape.Left = donut1.CircleXCenter - tAnnot.Bounds.Width / 2;
      tAnnot.Shape.Top = donut1.CircleYCenter - tAnnot.Bounds.Height / 2;

      return param;

[rpt]

Thanks this worked. Just want to let you know we are in process of buying .net version of software.

Thanks for your kind support.

[rpt]

Is this possible to have Marks in different color based on some condition

[Marc]

Hello,

This would be a way to achieve it:

Code: Select all

    

//add event
donut1.GetSeriesMark += new Steema.TeeChart.Styles.Series.GetSeriesMarkEventHandler(donut1_GetSeriesMark);

private void donut1_GetSeriesMark(Series series, GetSeriesMarkEventArgs e)
    {
      if (e.ValueIndex == 3)   //add your criteria, here 4th point
        series.Marks.Font.Color = Color.White;
      else
        series.Marks.Font.Color = Color.Black;

    }

series.ValueColor(e.ValueIndex) would give you the Point colour if you were to wish to check by that.


Regards,
Marc

[rpt]

Can you please help me to put marks in center in donut chart.

Untitled.png (13.43 KiB) Viewed 20577 times

Source :https://github.com/dekajp/TeeChart-for- ... ms-samples

[Christopher]

Can you please help me to put marks in center in donut chart.

I think you should be able to use the technique for custom positioning of marks which you can see here.

[Marc]

Hello,

As an alternative approach, you can turn off Marks and plot them yourself to take more control. This code centres them.

Eg.

Code: Select all

donut.Marks.Visible = false;

//use Chart’s AfterDraw event
    private void tChart1_AfterDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g)
    {
      Steema.TeeChart.Styles.Donut dnt = (Steema.TeeChart.Styles.Donut)tChart1[0];

      donut.Marks.Visible = false;

      for (int i=0; i < dnt.Count; i++)
      {
        //use these integers for plot coords
        int startxx;
        int startyy;
        int endxx;
        int endyy;

        //outside permiter halfway on each point
        dnt.AngleToPos(dnt.Angles[i].MidAngle, dnt.XRadius, dnt.YRadius, out startxx, out startyy);

        //get halfway as fraction, from donut hole to exterior
        double halfwayloc = 1.0-(1.0 - (dnt.DonutPercent / 100.0)) / 2.0;   

        //get centre location for each Mark
        dnt.AngleToPos(dnt.Angles[i].MidAngle, dnt.XRadius * halfwayloc, dnt.YRadius * halfwayloc, out endxx, out endyy);

        //setup Font
        g.Font.Size = 14;
        g.Font.Name = "Microsoft Sans Serif";

        //Get Mark text
        string myText = dnt.ValueMarkText(i);

        //output Text
        g.TextOut(endxx - (int)(g.TextWidth(myText)/2), endyy - (g.FontHeight/2), dnt.ValueMarkText(i));
      }
    }

You could add more sophistication. If the slice is small you could reduce the Font size (eg. if ((dnt.Angles.StartAngle - dnt.Angles.EndAngle) < somevalue) .. make font smaller…)

Or change the colour of the mark if the slice is a dark colour or light, etc.

I hope that may be of help.

Regards,
Marc

[rpt]

Perfect and Working. Thank you Marc.