CenterText

public String center(String s, int maxPixels) {
    int charPixelCount = MinecraftFont.Font.getWidth(ChatColor.stripColor(s));
    charPixelCount += getBoldPixels(s);

    int spaceCount = 0;
    if(charPixelCount < maxPixels) {
        int pixelsLeft = maxPixels-charPixelCount;
        int spacing = (int) Math.ceil(pixelsLeft/3);
        spaceCount = spacing/3;
    }

    if(spaceCount % 2 == 0)
        spaceCount++;

    if(spaceCount > 0) {
        StringBuilder sb = new StringBuilder();
        for(int i = 1; i <= spaceCount; i++)
            sb.append(" ");
        return sb.toString()+s;
    }else {
        return s;
    }
}

private int getBoldPixels(String s) {
    int additionalPixels = 0;

    Character previousChar = null;
    boolean isBold = false;

    for(char character : removeColor(colorize(s)).toCharArray()) {
        if(previousChar != null) {
            if(previousChar == '&' && character == 'l' || character == 'L')
                isBold = !isBold;
            if(character != '&' && character != '§')
                if(isBold)
                    additionalPixels++;
        }
        previousChar = character;
    }
    return additionalPixels;
}