TTMSFNCPDFLib - Draw path with transparent background

FNC TMS FNC Core
1

Is it possible to draw a path with transparent background?

2

If you mean transparent as in just a stroke instead of a fill, then yes this is possible.

uses
  FMX.TMSFNCGraphicsPDFEngine, FMX.TMSFNCGraphicsTypes;

procedure TForm1.Button1Click(Sender: TObject);
var
  e: TTMSFNCGraphicsPDFEngine;
  pth: TTMSFNCGraphicsPath;
  r: TRectF;
begin
  TMSFNCPDFLib1.BeginDocument('test.pdf');
  e := TTMSFNCGraphicsPDFEngine.Create(TMSFNCPDFLib1);
  try
    TMSFNCPDFLib1.NewPage;
    pth := TTMSFNCGraphicsPath.Create;
    try
      r := RectF(100, 100, 300, 200);
      pth.AddEllipse(r);
      e.Stroke.Color := gcRed;
      e.DrawText(r, 'Hello World', False, gtaCenter, gtaCenter);
      e.DrawPath(pth, pdmPolyline);
    finally
      pth.Free;
    end;
  finally
    e.Free;
    TMSFNCPDFLib1.EndDocument(True);
  end;
end;

If you mean , semi opaque or translucent then unfortunately no, it’s either fully drawn or not drawn.