Java SE 中 g.drawString 中的换行符

Question

这正是我想要做的：

Graphics2D g2 = (Graphics2D) g;
g2.setFont(new Font("Serif", Font.PLAIN, 5));
g2.setPaint(Color.black);
g2.drawString("Line 1\nLine 2", x, y);

该行打印如下：

Line1Line2

我想要这样：

Line1
Line2

我如何在 drawString 中执行此操作？

以及如何为一行添加制表符空间？

Answer 1

       private void drawString(Graphics g, String text, int x, int y) {
                for (String line : text.split("\n"))
                    g.drawString(line, x, y += g.getFontMetrics().getHeight());
            }

       private void drawtabString(Graphics g, String text, int x, int y) {
            for (String line : text.split("\t"))
                g.drawString(line, x += g.getFontMetrics().getHeight(), y);
        }


            Graphics2D g2 = (Graphics2D) g;
            g2.setFont(new Font("Serif", Font.PLAIN, 5));
            g2.setPaint(Color.black);
            drawString(g2,"Line 1\nLine 2", 120, 120);
            drawtabString(g2,"Line 1\tLine 2", 130, 130);

 

Answer 2

这是我用来在带有选项卡扩展和多行的 JPanel 中绘制文本的片段：

import javax.swing.*;
import java.awt.*;
import java.awt.geom.Rectangle2D;

public class Scratch {
    public static void main(String argv[]) {
        JFrame frame = new JFrame("FrameDemo");

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel() {
            @Override
            public void paint(Graphics graphics) {
                graphics.drawRect(100, 100, 1, 1);
                String message =
                        "abc\tdef\n" +
                        "abcx\tdef\tghi\n" +
                        "xxxxxxxxdef\n" +
                        "xxxxxxxxxxxxxxxxghi\n";
                int x = 100;
                int y = 100;
                FontMetrics fontMetrics = graphics.getFontMetrics();
                Rectangle2D tabBounds = fontMetrics.getStringBounds(
                        "xxxxxxxx",
                        graphics);
                int tabWidth = (int)tabBounds.getWidth();
                String[] lines = message.split("\n");
                for (String line : lines) {
                    int xColumn = x;
                    String[] columns = line.split("\t");
                    for (String column : columns) {
                        if (xColumn != x) {
                            // Align to tab stop.
                            xColumn += tabWidth - (xColumn-x) % tabWidth;
                        }
                        Rectangle2D columnBounds = fontMetrics.getStringBounds(
                                column,
                                graphics);
                        graphics.drawString(
                                column,
                                xColumn,
                                y + fontMetrics.getAscent());
                        xColumn += columnBounds.getWidth();
                    }
                    y += fontMetrics.getHeight();
                }
            }

            @Override
            public Dimension getPreferredSize() {
                return new Dimension(400, 200);
            }
        };
        frame.getContentPane().add(panel, BorderLayout.CENTER);

        frame.pack();

        frame.setVisible(true);    }
}

它真的看起来像 Utilities.drawTabbedText() 很有希望，但我无法弄清楚它需要什么作为输入。