Method create

src/annotations/ink.ts:27–88

* Create a new ink annotation dictionary.

(options: InkAnnotationOptions)

   * Create a new ink annotation dictionary.
   */
  static create(options: InkAnnotationOptions): PdfDict {
    const { paths } = options;
    const color = options.color ?? rgb(0, 0, 0);
    const colorComponents = colorToArray(color);

    // Calculate bounding rect from all paths
    let minX = Number.POSITIVE_INFINITY;
    let minY = Number.POSITIVE_INFINITY;
    let maxX = Number.NEGATIVE_INFINITY;
    let maxY = Number.NEGATIVE_INFINITY;

    for (const path of paths) {
      for (const point of path) {
        minX = Math.min(minX, point.x);
        minY = Math.min(minY, point.y);
        maxX = Math.max(maxX, point.x);
        maxY = Math.max(maxY, point.y);
      }
    }

    // Build InkList
    const inkList = new PdfArray([]);

    for (const path of paths) {
      const pathArr = new PdfArray([]);

      for (const point of path) {
        pathArr.push(PdfNumber.of(point.x));
        pathArr.push(PdfNumber.of(point.y));
      }

      inkList.push(pathArr);
    }

    const annotDict = PdfDict.of({
      Type: PdfName.of("Annot"),
      Subtype: PdfName.of("Ink"),
      Rect: new PdfArray([
        PdfNumber.of(minX),
        PdfNumber.of(minY),
        PdfNumber.of(maxX),
        PdfNumber.of(maxY),
      ]),
      InkList: inkList,
      C: new PdfArray(colorComponents.map(n => PdfNumber.of(n))),
      F: PdfNumber.of(4), // Print flag
    });

    // Border style for stroke width
    if (options.width !== undefined) {
      const bs = new PdfDict();
      bs.set("W", PdfNumber.of(options.width));
      bs.set("S", PdfName.of("S"));
      annotDict.set("BS", bs);
    }

    if (options.contents) {
      annotDict.set("Contents", PdfString.fromString(options.contents));