protected function drawPixel($im, $x, $y, $color = self::COLOR_FG) {
        $xR = ($x + $this->offsetX) * $this->scale + $this->pushLabel[0];
        $yR = ($y + $this->offsetY) * $this->scale + $this->pushLabel[1];

        // We always draw a rectangle
        imagefilledrectangle($im,
            $xR,
            $yR,
            $xR + $this->scale - 1,
            $yR + $this->scale - 1,
            $this->getColor($im, $color));
    }