Steema Central

Posted: **Tue Jan 29, 2008 11:18 pm**

Hi,

Is there a way to set TChart OnClickSeries mouse margin? I'm using the OnClickSeries event, but the mouse has to be right on the Series to receive the event. I'd like to change this so it is easier to click on a series.

Thanks

-Bill

Posted: **Wed Jan 30, 2008 9:31 am**

Hi Bill,

You can achieve what you request doing something like this:

Code: Select all

procedure TForm1.Chart1MouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
var i, j, tolerance: Integer;
    p, l0, l1: TPoint;
begin
  tolerance := 10;

  p.X := X;
  p.Y := Y;

  for i:=0 to Chart1.SeriesCount-1 do
  begin
    for j:=1 to Chart1[i].Count-1 do
    begin
      l0.X := Chart1[i].CalcXPos(j-1);
      l0.Y := Chart1[i].CalcYPos(j-1);

      l1.X := Chart1[i].CalcXPos(j-1);
      l1.Y := Chart1[i].CalcYPos(j-1);

      if PointInLine(p, l0, l1, tolerance) then
      begin
        Chart1.Title.Text[0] := 'Series' + IntToStr(i+1) + 'clicked at point ' + IntToStr(j);
        break;
      end;
    end;
  end;
end;

Posted: **Wed Jan 30, 2008 3:59 pm**

Thanks

Is there a tolerance setting in TChart to do that? What does TChart use to determine if a mouse is over a Series?

Posted: **Thu Jan 31, 2008 8:45 am**

Hi BE,

I'm afraid there's not such an option. Acutally, the PointInLine method I suggested is a TeeChart method, not Delphi's. TeeChart uses series's Clicked method for determining if they are being clicked or not.

Posted: **Thu Jan 31, 2008 2:09 pm**

Thanks for the reply. I remember TTree had a Click tolerance parameter, so I was just wondering if the same is true with TChart.

Posted: **Wed Jan 27, 2010 2:41 pm**

Hello,

I was just wondering if you have introduced a Tolerance parameters for seriesClick in version 8 of TeeChart, or if I should still use the same function shown above ?

Thank you !

Posted: **Thu Jan 28, 2010 4:09 pm**

Hi bertrod,

I don't think this (TV52014661) has been implemented in v8. You can what has been implemented recently in the release notes.

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