pdfkit/lib/spotcolor.js at 4133b0fd21c3e8ad2dbd9f3efe008a0f84bfefff · foliojs/pdfkit · GitHub

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export default class SpotColor {
  constructor(doc, name, C, M, Y, K) {
    if (typeof K === 'undefined') {
      this.id = 'CS' + Object.keys(doc.spotColors).length;
      this.name = name;
      this.values = [C, M, Y];
      this.ref = doc.ref([
        'Separation',
        this.name,
        'DeviceRGB',
        {
          Range: [0, 1, 0, 1, 0, 1],
          C0: [0, 0, 0],
          C1: this.values.map((value) => value / 255),
          FunctionType: 2,
          Domain: [0, 1],
          N: 1,
        },
      ]);
      this.ref.end();
    } else {
      this.id = 'CS' + Object.keys(doc.spotColors).length;
      this.name = name;
      this.values = [C, M, Y, K];
      this.ref = doc.ref([
        'Separation',
        this.name,
        'DeviceCMYK',
        {
          Range: [0, 1, 0, 1, 0, 1, 0, 1],
          C0: [0, 0, 0, 0],
          C1: this.values.map((value) => value / 100),
          FunctionType: 2,
          Domain: [0, 1],
          N: 1,
        },
      ]);
      this.ref.end();
    }
  }

  toString() {
    return `${this.ref.id} 0 R`;
  }
}