Canvas line

From Free Pascal wiki

The Canvas.Line(x1, y1, x2, y2) statement will draw a line from point (x1, y1) to (x2, y2).

The coordinates of the canvas are:

canvas2.png


This code will draw the diagonals in a form:

procedure TForm1.Form1Paint(Sender: TObject);
begin
  Canvas.Line(0, 0, Width-1, Height-1);
  Canvas.Line(0, Height-1, Width-1 ,0);
end;

See also