When is PosAxis updated?

[to2]

Hello,

I would like to arrange some icons near a vertical axis. Because I move the axes I have to recalculate the relative positions of the icons to the axis. When I change TChart->MarginLeft and TChartAxis->PositionPercent, TChartAxis->PosAxis is not updated immediately. When is this value updated?

[Narcís]

Hi to2,

You may force them being changed by re-drawing the chart using Chart1.Invalidate or Chart1.Refresh methods.

[to2]

You may force them being changed by re-drawing the chart using Chart1.Invalidate or Chart1.Refresh methods.

I set all units to pixels. LeftAxis is invisible.

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Chart1->MarginLeft  = 35;
Chart1->LeftAxis->PositionPercent = 0;

IMO Chart1->LeftAxis->FPosAxis should be 35 now.

DebugInspector: Chart1->LeftAxis->FPosAxis=0

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Chart1->LeftAxis->Visible = true;

DebugInspector: Chart1->LeftAxis->FPosAxis=0

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Chart1->Refresh();

DebugInspector: Chart1->LeftAxis->FPosAxis=0

Next Time I run this code -> DebugInspector: Chart1->LeftAxis->FPosAxis=35

FPosAxis gets its 35 pixels but I don't know when. I can't force it by Invalidate(), Refresh(), Repaint(). What I want to prevent is a Application->ProcessMessages().

[Pep]

Hi,

to do this you should use the OnAfterDraw event, using similar code to the following all custom objects (like texts,..) are moved changing the margins.

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procedure TForm1.BitBtn1Click(Sender: TObject);
begin
Chart1.MarginLeft  := 35;
Chart1.LeftAxis.positionPercent := 0;
end;

procedure TForm1.Chart1AfterDraw(Sender: TObject);
begin
Chart1.Canvas.TextOut(Chart1.LeftAxis.PosAxis,Chart1.BottomAxis.PosAxis,'hello world');
end;