[SOLVED] Is there a way to determine a axis by position
lazarus / 55-TAChart

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suilenroc1183 · 2012-10-17 19:36

Hi,
I have a chart with several y - axis and I will program a feature that
a configuration dialog opens on double click on a axis.

My problem is to determine the axis under the mouse pointer. Is there
a way to calculate the drawing area of an axis?

Thanks in advance

suilenroc

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Ask · 2012-10-18 02:56

I do have plans to implement axis tools, but have no time right now.

Meanwhile, you can use TChartAxis.IsPointInside function.

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suilenroc1183 · 2012-10-30 20:14

Hi,
thanks for this tip. IsPointInside is good enough for me to solve my
problem.

Thanks for your great work on TAChart.

suilenroc

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CM630 · 2012-11-06 12:29

To make things clearer, it could be mentioned that
TChartAxis.IsPointInside behaves as TChartAxis.Marks.IsPointInside
If I click on the axis title, TChartAxis.IsPointInside returns false,
still the title is a part of the axis.

Example:
Code: [Select]procedure TForm1.FormCreate(Sender: TObject);
begin
  Chart1.LeftAxis.Title.Visible:=True;
  Chart1.LeftAxis.Title.Caption:='Left axis title';
end;

procedure TForm1.Chart1MouseDown(Sender: TObject; Button:
TMouseButton;
  Shift: TShiftState; X, Y: Integer);
var
  APoint: TPoint;
begin
  APoint.x:=X;
  APoint.y:=Y;
if Chart1.LeftAxis.IsPointInside(APoint)= True then ShowMessage
('Inside');
end;
I would like to use the case to ask if there is a way to determine
where the axis title is in the chart and/or if the mouse is inside it?