Steema Central

Posted: **Wed Aug 29, 2007 4:03 pm**

Hi,
I have a fast line serie with a drag point tool asociated to it and I would like to allow only de last point of the series to be dragged, not just any point of it.
I am using the event OnDragPoint of the tool to capture the point being dragged and in the OnMouseUp event of the TChart I do the rest.

Is there any way to "cancel" or "undo last drag" if the dragged point is not the last one?. I can't realise how to do that.

Thanks in advance.

Edit: I am using TeeChart 7.0 Source Code.

Posted: **Thu Aug 30, 2007 8:45 am**

Hi Jorge,

The easiest way to only allow dragging of the last point is using chart's OnMouseDown and OnMouseUp event for only activating the tool for the last point in the series:

Code: Select all

procedure TForm1.Chart1MouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  ChartTool1.Active:=true;
end;

procedure TForm1.Chart1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  if (Series1.Clicked(X,Y)<>Series1.Count-1) then
    ChartTool1.Active:=false;
end;

Posted: **Thu Aug 30, 2007 5:37 pm**

Hi Narcís,

thanks for the reply. That advice helped me to do the "trick".

Cheers

Jorge.

Steema Central

[Solved] TDragPointTool - Cancel dragging

[Solved] TDragPointTool - Cancel dragging