Java使用Graphics2D实现字符串文本自动换行

    /**
     * @return void
     * @Author xia
     * @Description //TODO 写字换行算法
     * @Date 18:08 2021/4/1
     * @Param []
     **/
    private static void drawWordAndLineFeed(Graphics2D g2d, Font font, String words, int wordsX, int wordsY, int wordsWidth) {
        FontDesignMetrics metrics = FontDesignMetrics.getMetrics(font);
        // 获取字符的最高的高度
        int height = metrics.getHeight();
 
        int width = 0;
        int count = 0;
        int total = words.length();
        String subWords = words;
        int b = 0;
        for (int i = 0; i < total; i++) {
            // 统计字符串宽度 并与 预设好的宽度 作比较
            if (width <= wordsWidth) {
                width += metrics.charWidth(words.charAt(i)); // 获取每个字符的宽度
                count++;
            } else {
                // 画 除了最后一行的前几行
                String substring = subWords.substring(0, count);
                g2d.drawString(substring, wordsX, wordsY + (b * height));
                subWords = subWords.substring(count);
                b++;
                width = 0;
                count = 0;
            }
            // 画 最后一行字符串
            if (i == total - 1) {
                g2d.drawString(subWords, wordsX, wordsY + (b * height));
            }
        }
    }

      // 添加第二行文字
            Font fontTwo = new Font("MIMO天线及其空口测试技术", Font.BOLD, 140  );
            graphics.setFont(fontTwo);
            graphics.setColor(Color.WHITE);
            String textTwo = "MIMO天线及其空口测试技术";
            int twoX = 50; // 第二行文字起始x坐标
            int twoY = 480; // 第二行文字起始y坐标
            drawWordAndLineFeed(graphics, fontTwo, textTwo, twoX, twoY, 1200);

    public static void drawMyString(Graphics textGraphics, String text) {
 
        // 每列显示的汉字数量
        int columnSize = 7;
        // 文字之间的垂直间距
        int verticalSpacing = 75;
 
        // 获取字体渲染上下文
        FontMetrics fm = textGraphics.getFontMetrics();
        // 获取字体的高度
        int fontHeight = fm.getHeight();
        System.out.println(fontHeight);
        // 计算每列的宽度
        int columnWidth = fontHeight + verticalSpacing;
 
        // 设置初始位置
        int x = 260;
        int y = 450;
        Font fontFour = new Font(" Source Han Sans CN", Font.BOLD, 100);
        textGraphics.setFont(fontFour);
 
        Color color = new Color(0, 88, 38);
        textGraphics.setColor(color);
//        // 绘制文字
        int charCount = 0;
        int totalColumns = (int)Math.ceil((double)text.length() / columnSize); // 总列数
        int totalRows = Math.min(columnSize, text.length()); // 总行数
        int remainingChars = text.length() % columnSize; // 最后一列剩余字符数
 
        for (int columnIndex = 0; columnIndex < totalColumns; columnIndex++) {
            for (int rowIndex = 0; rowIndex < totalRows; rowIndex++) {
                if (charCount >= text.length()) break;
                char ch = text.charAt(charCount);
//                // 计算当前位置
                int cx = x - columnIndex * columnWidth;
                int cy = y + rowIndex * fontHeight + rowIndex * verticalSpacing; // 加入垂直偏移量
// 计算当前位置
//                int cx = x - columnIndex * columnWidth;
//                int cy = y + rowIndex * fontHeight + rowIndex * verticalSpacing + columnIndex ;
 
                // 如果是最后一列并且不满 7 个字符，则需要将剩余字符居中
                if (columnIndex == totalColumns - 1 && remainingChars > 0) {
                    int extraVerticalSpace = (columnSize - remainingChars) * (fontHeight + verticalSpacing) / 2;
                    cy += extraVerticalSpace;
                }
 
                // 绘制文字
                textGraphics.drawString(String.valueOf(ch), cx, cy);
                charCount++;
            }
        }
 
    }

        // TODO 讲座名称
        String lectureName = "时空相分离调控的职务细胞信号转导";
        drawMyString(graphics, lectureName);