Created attachment 909 [details]
screenshot

Improve intelligence of connecting lines in Gantt Series.
See a screenshot from a customer (lines in green show the expected result).

- Draw arrow heads
- Add intelligence to avoid overlapping lines
- Add intelligence to avoid drawing the line above the gantt bars when the line goes back.

uses GanttCh;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Chart1.View3D:=False;
  Chart1.Legend.Hide;

  with TGanttSeries(Chart1.AddSeries(TGanttSeries)) do
  begin
    ConnectingPen.Color:=clRed;
    ConnectingPen.Width:=2;

    AddGantt(Now+5, Now+10, 0);
    AddGantt(Now+5, Now+10, 1);
    AddGantt(Now, Now+5, 2);
    AddGantt(Now+10, Now+15, 2);
    AddGantt(Now, Now+5, 3);
    AddGantt(Now+10, Now+15, 3);

    NextTask[1]:=0;
    NextTask[2]:=5;
    NextTask[4]:=3;
  end;
end;