Problems with setColor and drawLine

Indeed,

my mind was simply too "embedded"...the following works as expected:

  Bangle.setLCDMode();                                // use normal display mode
  g.clear();

  const Width = g.getWidth();
  const Height = g.getHeight();
  
  for (let x = 0; x < Width; x++) {
    let Color = x/Width;
    g.setColor(Color,0,0);
    g.drawLine(x,0, x,Height-1);
  }

Thank you very much for your help!