java - 除了删除线之外，AttributedString 的任何功能都不起作用

Question

我必须将一个字符串写入BufferedImage。我正在使用 AttributedString。 TextAttribute.STRIKETHROUGH 正在工作。上标、下标等都不起作用。

public class TextAttributesSuperscript  {

    static String Background = "input.png";
    static int curX = 10;
    static int curY = 50;

    public static void main(String[] args) throws Exception {
        AttributedString attributedString= new AttributedString("this is data. this data should be super script");

        attributedString.addAttribute(TextAttribute.FONT, new Font("TimesRoman", Font.PLAIN, 18));
        attributedString.addAttribute(TextAttribute.FOREGROUND, Color.BLACK);


        attributedString.addAttribute(TextAttribute.FONT, new Font("TimesRoman", Font.BOLD, 18), 30,33);
        attributedString.addAttribute(TextAttribute.FOREGROUND, Color.BLUE, 29,33);
    attributedString.addAttribute(TextAttribute.SUPERSCRIPT,TextAttribute.SUPERSCRIPT_SUPER,30,33);

        final BufferedImage image = ImageIO.read(new File(Background));
        Graphics g = image.getGraphics();
        g.drawString(attributedString.getIterator(), curX, curY);
        g.dispose();
        ImageIO.write(image, "png", new File("output.png"));
    }
}

执行上面的代码时。上标部分不起作用(文本没有像上标一样打印)

Answer 1

我不太确定为什么你的代码不起作用，因为这样做似乎完全符合逻辑。我不明白为什么有些属性有效而有些无效。

但是根据the Java 2D Tutorial: Using Text Attributes to Style Text ，SUPERSCRIPT属性应该在字体上设置，而不是在文本本身上设置。 IE。使用Font.deriveFont(Map<Attribute, ?> attributes) .

以下内容对我有用(我稍微修改了您的代码以不依赖于您的后台文件):

public class TextAttributesSuperscript  {

    static int curX = 10;
    static int curY = 50;

    public static void main(String[] args) throws Exception {
        AttributedString attributedString = new AttributedString("this is data. this data should be super script");

        attributedString.addAttribute(TextAttribute.FONT, new Font("TimesRoman", Font.PLAIN, 18));
        attributedString.addAttribute(TextAttribute.FOREGROUND, Color.BLACK);

        Font superScript = new Font("TimesRoman", Font.BOLD, 18)
                .deriveFont(Collections.singletonMap(TextAttribute.SUPERSCRIPT, TextAttribute.SUPERSCRIPT_SUPER));
        attributedString.addAttribute(TextAttribute.FONT, superScript, 30, 33);
        attributedString.addAttribute(TextAttribute.FOREGROUND, Color.BLUE, 30,33);

        BufferedImage image = new BufferedImage(400, 100, BufferedImage.TYPE_INT_ARGB);

        Graphics2D g = image.createGraphics();
        g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_GASP);
        g.setColor(Color.WHITE);

        g.fillRect(0, 0, image.getWidth(), image.getHeight());
        g.drawString(attributedString.getIterator(), curX, curY);
        g.dispose();

        ImageIO.write(image, "png", new File("output.png"));
    }
}