TCandleSeries and Marks

[Huke]

Hello,
I'm using Marks to insert some textual info over a candle chart but I've two problems:

1 - the mark text sometime overlaps the candle (it appears to be associated with Open value...) so I'd like to move every marks to a constant distance from High value. I tried ArrowLength but it moves all the marks... I also tried MoveTo but I cannot control marks position when scrolling and changing scale.... any idea?

1 - sometime I need a two-line mark text but if I try to insert a line break of any kind (TeeLineSeparator, #10, #13, #10 #13, ...) I always get a little box starting the second line, using Marks.MultiLine:=True or False doesn't help...

Thanks a lot!

Best Regards.

[Yeray]

Hi Huke,

1 - the mark text sometime overlaps the candle (it appears to be associated with Open value...) so I'd like to move every marks to a constant distance from High value. I tried ArrowLength but it moves all the marks... I also tried MoveTo but I cannot control marks position when scrolling and changing scale.... any idea?

You can recalculate the Marks position each time the chart is scrolled, zoomed, etc simply calling the method where this calculation is made on all the required events.

1 - sometime I need a two-line mark text but if I try to insert a line break of any kind (TeeLineSeparator, #10, #13, #10 #13, ...) I always get a little box starting the second line, using Marks.MultiLine:=True or False doesn't help...

This depends on the environment you are using. In VB6 you can use vbNewLine.

Find below an example where both features seem to work as expected in VB6 with the latest version v2011.0.0.5:

Code: Select all

Private Sub Form_Load()  
  TChart1.Aspect.View3D = False
  TChart1.Legend.Visible = False
  TChart1.Panel.MarginRight = 10
  
  TChart1.AddSeries scCandle
  TChart1.Series(0).FillSampleValues 10
  
  Dim i As Integer
  For i = 0 To TChart1.Series(0).Count - 1
    TChart1.Series(0).PointLabel(i) = "Point nº" + Str$(i)
    
    If i = 5 Then
      TChart1.Series(0).PointLabel(i) = "Point" + vbNewLine + "nº" + Str$(i)
    End If
  Next i
  
  TChart1.Series(0).Marks.Visible = True
  TChart1.Series(0).Marks.Arrow.Color = vbBlack
  
  MarksRepos
End Sub

Private Sub MarksRepos()
  Dim i, vertOffset As Integer
  Dim pos As ISeriesMarkPosition
  Dim XVal, YVal As Double
  
  TChart1.Environment.InternalRepaint
  
  vertOffset = TChart1.Canvas.textHeight(" ") / 2
  
  For i = 0 To TChart1.Series(0).Count - 1
    XPos = TChart1.Series(0).XValues.Value(i)
    YPos = TChart1.Series(0).asCandle.HighValues.Value(i)
    
    With TChart1.Series(0).Marks.Positions.Position(i)
      .Custom = True
      .ArrowFrom.X = TChart1.Axis.Bottom.CalcXPosValue(XPos)
      .ArrowFrom.Y = TChart1.Axis.Left.CalcYPosValue(YPos)
      .LeftTop.X = .ArrowFrom.X + 5
      .LeftTop.Y = .ArrowFrom.Y - vertOffset
      .ArrowTo.X = .LeftTop.X
      .ArrowTo.Y = .ArrowFrom.Y
    End With
  Next i
End Sub

Private Sub TChart1_OnResize()
  MarksRepos
End Sub

Private Sub TChart1_OnScroll()
  MarksRepos
End Sub

Private Sub TChart1_OnUndoZoom()
  MarksRepos
End Sub

Private Sub TChart1_OnZoom()
  MarksRepos
End Sub

Chart1.png (9.87 KiB) Viewed 4406 times

[Huke]

Hello Yeray, thanks for the kind reply.

Unfortunately using your example in my code it doesn't seems to work... when I scroll the chart the marks sometimes go to the ceiling of chart, sometime disappears.
I use Delphi XE and TeeChart Pro v2011.03.30407 Win32

This is the code I use:

Code: Select all

procedure TfrmChart.MarksSetPosition();
Var
  i, vertOffset :Integer;
  XPos, YPos :Double;
begin
  vertOffset := Chart.Canvas.textHeight(' ') div 2;

  For i := 0 To Chart.Series[0].Count - 1 do
  Begin
    XPos := Chart.Series[0].XValues.Value[i];
    YPos := (Chart.Series[0] As TCandleSeries).HighValues.Value[i];

    if (Chart.Series[0].Marks.Positions.Position[i]) <> nil then
    Begin
      With (Chart.Series[0].Marks.Positions.Position[i]) Do
      Begin
        Custom := True;
        ArrowFrom.X := Chart.BottomAxis.CalcXPosValue(XPos);
        ArrowFrom.Y := Chart.LeftAxis.CalcYPosValue(YPos);
        LeftTop.X := ArrowFrom.X + 5;
        LeftTop.Y := ArrowFrom.Y - vertOffset;
        ArrowTo.X := LeftTop.X;
        ArrowTo.Y := ArrowFrom.Y;
      End;
    End;
  End;
End;

About multiline mark also I've some problems:
the method "PointLabel" you indicate it doesn't seems to exist.
I tried with:

Code: Select all

 (Chart.Series[0] As TCandleSeries).Marks.Item[i].Text.Text := 'line1' + TeeLineSeparator + 'line2';

but I always get a little box shaped character starting the second line.
I believe it's something related to unicode but I cannot understand what...

Thank a lot!

Best Regards.
Huke

[Yeray]

Hi Huke,

I use Delphi XE and TeeChart Pro v2011.03.30407 Win32

Oups. It seems I thought we were in the AX forum

Unfortunately using your example in my code it doesn't seems to work... when I scroll the chart the marks sometimes go to the ceiling of chart, sometime disappears.

I see you translated the majority of the code from VB to Delphi without too much problems. However, I don't see the equivalent for the InternalRepaint call. Note, you need to be sure the chart has just been drawn so the CalcXPosValue & CalcYPosValue can work as expected. Anyway, maybe in your complete code you ensure it before calling the MarksSetPosition procedure.

I've tried your code (with some little adjustments) in a new simple application and it seems to work fine for me here, also with XE + TeeChart v2011.03.

testCandleMarks.zip

(2.07 KiB) Downloaded 291 times

About multiline mark also I've some problems:
the method "PointLabel" you indicate it doesn't seems to exist.
I tried with:

Code: Select all

(Chart.Series[0] As TCandleSeries).Marks.Item[i].Text.Text := 'line1' + TeeLineSeparator + 'line2';

but I always get a little box shaped character starting the second line.
I believe it's something related to unicode but I cannot understand what...

I've used Chart1[0].Labels.Labels and TeeLineSeparator in the example above and it seems to work fine. #13#10 also worked fine for me here.