Gantt chart: add a label on a connecting pen

[gcoray]

Hello,

I have a Gantt serie with some bars. I want to display a line between each bar which will have a label associated.

Example with the picture below:

Label on lines example

ganttexample.png (4.21 KiB) Viewed 3715 times

The two blocks REQA and ATQA are connected (using the NextTasks property) and a line is displayed between them (using the ConnectingPen property).
Is there a way to add a label on this line, like for the blocks ?

Best regards.

[Yeray]

Hello,

I'm afraid this is not possible right now. However, it wouldn't be very difficult, for example, to have an array of Annotation tools to show the desired texts.

[Narcís]

Hi gcoray,

Yes, you can do that using Annotation tools set to a custom position in the OnAfterDraw event as in the example here:

Code: Select all

    public Form1()
    {
      InitializeComponent();
      InitializeChart();
    }

    private Steema.TeeChart.Styles.Gantt gantt1;

    private void InitializeChart()
    {
      tChart1.Aspect.View3D = false;
      tChart1.Legend.Visible = false;

      gantt1 = new Steema.TeeChart.Styles.Gantt(tChart1.Chart);
      gantt1.Add(DateTime.Now, DateTime.Now.AddDays(2), 1, "task1");
      gantt1.NextTasks[0]=gantt1.Add(DateTime.Now.AddDays(4), DateTime.Now.AddDays(5), 1, "task2");

      tChart1.AfterDraw += new Steema.TeeChart.PaintChartEventHandler(tChart1_AfterDraw);

      tChart1.Draw();
    }

    void tChart1_AfterDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g)
    {
      for (int i = 0; i < gantt1.NextTasks.Count; i++)
      {
        int next = (int)gantt1.NextTasks[i];
        if (next != -1)
        {
          Steema.TeeChart.Tools.Annotation annotation1 = new Steema.TeeChart.Tools.Annotation(tChart1.Chart);
          annotation1.Shape.CustomPosition = true;
          annotation1.Text = "Connecting line " + i.ToString();

          SizeF textSize = g.MeasureString(annotation1.Shape.Font, annotation1.Text);
                    
          int x = gantt1.CalcXPosValue(gantt1.EndValues[i]) + (gantt1.CalcXPosValue(gantt1.StartValues[next]) - gantt1.CalcXPosValue(gantt1.EndValues[i])) / 2;
          int y = gantt1.CalcYPos(i) - 30;

          annotation1.Shape.Left = x - (int)textSize.Width / 2;
          annotation1.Shape.Top = y;
        }
      }
    }

[gcoray]

Hi,

Thank you very much ! I think this will be fine.

Best regards.