问如何正确使用PDPageContentStream::setTextRise？

EN

public static void main(String[] args) {
    try {
        
        String extracted_text = "Capo 1\n\n1\n[G]Glory be to [D]God [Em]the [C]Father,\n[G]And to [A]Christ the [D]Son,\n[B7]Glory to the [Em]Holy [C]Spirit—\n[D-D7]Ever [ G]One.\n\n2\nAs we view the vast creation,\nPlanned with wondrous skill,\nSo our hearts would move to worship,\nAnd be still.\n\n3\nBut, our God, how great Thy yearning\nTo have sons who love\nIn the Son e’en now to praise Thee,\nLove to prove!\n\n4\n’Twas Thy thought in revelation,\nTo present to men\nSecrets of Thine own affections,\nTheirs to win.\n\n5\nSo in Christ, through His redemption\n(Vanquished evil powers!)\nThou hast brought, in new creation,\nWorshippers!\n\n6\nGlory be to God the Father,\nAnd to Christ the Son,\nGlory to the Holy Spirit—\nEver One.\n".replaceAll("\n", "\r");
        
        String[] lines = extracted_text.split("\\r");
        
        ArrayList<SongLine> songlines = new ArrayList<>();
        for(String s : lines) {
            LinkedHashMap<Integer, String> chords = new LinkedHashMap();
            StringBuilder line = new StringBuilder();
            StringBuilder currentchord = null;
            int index = 0;
            for(char c : s.toCharArray()) {
                if(currentchord != null) {
                    if(c == ']') {
                        chords.put(index, currentchord.toString());
                        currentchord = null;
                    } else {
                        currentchord.append(c);
                    }
                } else {
                    if(c == '[') {
                        currentchord = new StringBuilder();
                    } else {
                        line.append(c);
                        index++;
                    }
                }
            }
            
            SongLine sl = new SongLine();
            if(chords.size() > 0)
                sl.char_index_to_chords = chords;
            sl.line = line.toString();
            
            songlines.add(sl);
        }
        
        try (PDDocument doc = new PDDocument()) {
            PDPage page = new PDPage();
            PDPageContentStream pcs = new PDPageContentStream(doc, page);
            int firstLineX = 25;
            int firstLineY = 700;
            boolean first = true;

            float leading = 14.5f;
            pcs.beginText();
            pcs.newLineAtOffset(firstLineX, firstLineY);
            pcs.setFont(PDType1Font.TIMES_ROMAN, 12);
            pcs.setLeading(leading);
            for(SongLine line : songlines) {
                if(line.char_index_to_chords != null)
                    System.out.println(line.char_index_to_chords.toString());
                System.out.println(line.line);
                if(!first) {
                    pcs.newLine();
                }
                first = false;
                if(line.char_index_to_chords != null) {
                    pcs.newLine();
                }
                for(int i = 0; i < line.line.length(); i++) {
                    pcs.showText(String.valueOf(line.line.charAt(i)));
                    if(line.char_index_to_chords != null && line.char_index_to_chords.containsKey(i)) {
                        
                        pcs.setTextRise(12);
                        pcs.showText(line.char_index_to_chords.get(i));
                        pcs.setTextRise(0);
                    }
                }
            }
            pcs.endText();
            pcs.close();
            doc.addPage(page);
            String path = "0001.pdf";
            doc.save(path);
            
            Desktop.getDesktop().open(new File(path));
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}


static class SongLine {
    Map<Integer, String> char_index_to_chords;
    String line;
}