如何在 PDFKIT 中显示封闭的字母数字 (⒮, ①) 或转换为普通字母数字字符串

Question

我正在使用 PDFKIT 在 Node JS 上生成 PDF。但是，无法生成封闭的字母数字（如⒮、①等）。

我查看了 Google fonts，NotoSansCJKjp-Regular 似乎支持封闭的字母数字。所以我认为可能是这个库不支持封闭的字母数字。

有没有我可以在 PDF 上生成封闭的字母数字或有什么方法可以将其转换为常规字母数字？

例如⒮=>(s),①=>1

感谢您的帮助！

下面是我的代码。

export class CreateVoucherUsecase {
  private doc = new PDFDocument({ size: 'A4', margin: 20 });

  async createAirTicketVoucher(res: Response, id: number): Promise<void> {
    const hotel = await new AirTicketRepository().findById(id);
    if (hotel === null) throw new NotFoundError('airticket voucher pdf: airticket not found: id = ' + id);
    this.setFontRegular();
    this.writeInfo(res, info);
    this.doc.end();
  }

  private drawHorizontalLine(params: { length: number; color?: string; width?: number; dy?: number }): void {
    this.doc
      .moveTo(this.doc.x, this.doc.y + (params.dy ?? 0))
      .lineWidth(params.width ?? 1)
      .lineTo(this.doc.x + params.length, this.doc.y + (params.dy ?? 0))
      .stroke(params.color ?? 'blue');
  }

  private getAsset(path: string): string {
    return require.main?.path.replace('dist', path) ?? '';
  }

  private setFont(style: string): void {
    this.doc.font(this.getAsset(`fonts/NotoSansCJKjp-${style}.ttf`));
  }
  private setFontRegular(): void {
    this.setFont('Regular');
  }
  private setFontBold(): void {
    this.setFont('Bold');
    this.doc.fontSize(12);
  }

  /** write text. not update indent */
  private text(value: string, x?: number, y?: number) {
    const originalX = this.doc.x;
    return this.doc.text(value, x, y).text('', originalX);
  }

  private writeH2(text: string): void {
    this.setFontBold();
    this.doc
      .moveDown()
      .fillColor('black')
      .text(text, undefined, this.doc.y + 10);
    this.setFontRegular();
  }

  private writeLink(link: string, length: number): void {
    this.doc.fillColor('blue').text(link);
    this.drawHorizontalLine({ length: length, dy: SPACE });
  }

  private writeTable(labels: string[], values: (string | number)[]): void {
    const tableWidth = 480;
    const column1Width = 150;
    const marginLeft = 3;
    for (let i = 0; i < labels.length; i++) {
      const [leftTopX, leftTopY] = [this.doc.x, this.doc.y];
      this.text(labels[i], leftTopX + marginLeft);
      const [newX, newY] = [this.doc.x, this.doc.y];
      this.text(convert2String(values[i].toString()), leftTopX + column1Width + marginLeft, leftTopY);
      this.text('', newX, newY); 
      const [rectX, rectY, rectHeight] = [leftTopX, leftTopY + SPACE, this.doc.y - leftTopY];
      if (i < labels.length)
        this.doc
          .lineWidth(1)
          .rect(rectX, rectY, tableWidth, rectHeight)
          .stroke('black')
          .rect(rectX, rectY, column1Width, rectHeight)
          .fillOpacity(0.2)
          .fillAndStroke('#AFEEEE', 'black')
          .fillOpacity(1)
          .fillColor('black');
    }
  }

  private writeInfo(res: Response, info: Info): void {
   ...........
  }
}

Answer 1

当我使用下面的normalization method.

问题就解决了

String.normalize('NFKC')

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