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 Need to check if user clicked on a layer		  New Topic  Reply to Topic
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serverinfo

Brazil
9 Posts
Posted - Jan 21 2020 :  11:46:40  Show Profile  Reply
I am using the OnMouseDown and OnMouseUp of the Image component and need to know if the position the user clicked has a layer or not, and wich layer it is. Basically i need to do something when a user clicks a layer and do other stuff when the user click an area that has no layer under the mouse position.

How can i do that?

Thank You.

xequte

38175 Posts
Posted - Jan 21 2020 :  19:53:34  Show Profile  Reply
Hi

Please use FindLayerAt:

https://www.imageen.com/help/TImageEnView.FindLayerAt.html

Here is an example:

// Show which layer is under the cursor
procedure TMainForm.ImageEnView1MouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
var
  lyr: Integer;
begin
  lyr := ImageEnView1.FindLayerAt( X, Y );
  if lyr < 0 then
    lblLayer.Caption := 'Layer: None'
  else
    lblLayer.Caption := 'Layer: ' + IntToStr( lyr );
end;


Nigel
Xequte Software
www.imageen.com
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