Canvas line
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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:
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;
