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目前我们尝试获取使用任意字体呈现的字符串的宽度。

BufferedImage img = new BufferedImage(10, 10, BufferedImage.TRANSLUCENT);
    img.createGraphics();
    Graphics2D g = (Graphics2D) img.getGraphics();
    g.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
    g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);


    FontMetrics metrics = g.getFontMetrics(font);
    // get the height of a line of text in this font and render context
    int hgt = metrics.getHeight();
    // get the advance of my text in this font and render context
    int adv = metrics.stringWidth(text);
    // calculate the size of a box to hold the text with some padding.
    //Dimension dim = new Dimension(adv + 2, hgt + 2);

问题出在这条线...

 int adv = metrics.stringWidth(text);

对于大多数字体，这有效，但对于一些更高级的脚本字体，它似乎比我们预期的要宽。根据 FontMetrics.stringWidth 的 javadoc，您甚至可以阅读...

返回在此字体中显示指定字符串的总前进宽度。前进是字符串基线上从最左边点到最右边点的距离。请注意，字符串的前进不一定是其字符前进的总和。

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