矩形中的Java中心文本

我使用drawString()方法使用Graphics绘制字符串，但我想将文本居中放在矩形中。 我该怎么做？

Answer 1

我用它来将文本放在JPanel上

  Graphics2D g2d = (Graphics2D) g; FontMetrics fm = g2d.getFontMetrics(); Rectangle2D r = fm.getStringBounds(stringTime, g2d); int x = (this.getWidth() - (int) r.getWidth()) / 2; int y = (this.getHeight() - (int) r.getHeight()) / 2 + fm.getAscent(); g.drawString(stringTime, x, y); 

Answer 2

居中文本有很多“选项”。 你是绝对中心还是基于基线？

就个人而言，我更喜欢绝对的中心位置，但这取决于你在做什么……

 public class CenterText { public static void main(String[] args) { new CenterText(); } public CenterText() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { } JFrame frame = new JFrame("Test"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.add(new TestPane()); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class TestPane extends JPanel { @Override public Dimension getPreferredSize() { return new Dimension(200, 200); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); int height = getHeight(); String text = "This is a test xyx"; g.setColor(Color.RED); g.drawLine(0, height / 2, getWidth(), height / 2); FontMetrics fm = g.getFontMetrics(); int totalWidth = (fm.stringWidth(text) * 2) + 4; // Baseline int x = (getWidth() - totalWidth) / 2; int y = (getHeight() - fm.getHeight()) / 2; g.setColor(Color.BLACK); g.drawString(text, x, y + ((fm.getDescent() + fm.getAscent()) / 2)); // Absolute... x += fm.stringWidth(text) + 2; y = ((getHeight() - fm.getHeight()) / 2) + fm.getAscent(); g.drawString(text, x, y); } } }