如何获得真正的字符串高度在Java中？

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我用 FontMetrics.getHeight（）来获取字符串的高度，但它给了我一个错误的值，切断的字符串中的字符的下行。有没有更好的功能，我可以使用？

I'm using FontMetrics.getHeight() to get the height of the string, but it gives me a wrong value, cutting off the descenders of string characters. Is there a better function I can use?

推荐答案

previous code：

Previous code:

protected float getLabelHeight(Graphics2D g2, String label) { FontRenderContext frc = g2.getFontRenderContext(); return LABEL_FONT.getLineMetrics(label, frc).getHeight(); }

目前的答案：

我所定义的 getStringBounds（）下面的方法，根据的GlyphVector 当前的Graphics2D 字体，这非常适用于文本的字符串：

I've defined the getStringBounds() method below, based on the GlyphVector for the current Graphics2D font, which works very well for one string of text:

public class StringBoundsPanel extends JPanel { public StringBoundsPanel() { setBackground(Color.white); setPreferredSize(new Dimension(400, 247)); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2 = (Graphics2D) g; g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); // must be called before getTextBounds() g2.setFont(getDesiredFont()); String str = "My Text"; float x = 140, y = 128; Rectangle bounds = getStringBounds(g2, str, x, y); g2.setColor(Color.red); g2.drawString(str, x, y); g2.setColor(Color.blue); g2.draw(bounds); g2.dispose(); } private Rectangle getStringBounds(Graphics2D g2, String str, float x, float y) { FontRenderContext frc = g2.getFontRenderContext(); GlyphVector gv = g2.getFont().createGlyphVector(frc, str); return gv.getPixelBounds(null, x, y); } private Font getDesiredFont() { return new Font(Font.SANS_SERIF, Font.BOLD, 28); } private void startUI() { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(this); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } public static void main(String[] args) throws Exception { final StringBoundsPanel tb = new StringBoundsPanel(); SwingUtilities.invokeAndWait(new Runnable() { public void run() { tb.startUI(); } }); } }

请注意，我已经省略了进口清晰度。

Note that I've omitted the imports for clarity.

结果：