if ($stop < ($i + 1) * (M_PI / 2) && $x <= $xStop) {
                        $diffColor1 = imagecolorexactalpha($img, $color[0], $color[1], $color[2], 127 - (127 - $color[3]) * $error1);
                        $y1         = $_y1;
                        if ($aaStopX) {
                            imagesetpixel($img, $cx + $xp * ($x) + $xa, $cy + $yp * ($y1 + 1) + $ya, $diffColor1);