LwgDocument document = new LwgDocument(LwgPageSize.A4, 50, 50, 50, 50);
try {
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("shading.pdf"));
document.open();
PdfFunction function1 = PdfFunction.type2(writer, new float[]{0, 1}, null,
new float[]{.929f, .357f, 1, .298f}, new float[]{.631f, .278f, 1, .027f}, 1.048f);
PdfFunction function2 = PdfFunction.type2(writer, new float[]{0, 1}, null,
new float[]{.929f, .357f, 1, .298f}, new float[]{.941f, .4f, 1, .102f}, 1.374f);
PdfFunction function3 = PdfFunction.type3(writer, new float[]{0, 1}, null,
new PdfFunction[]{function1, function2}, new float[]{.708f}, new float[]{1, 0, 0, 1});
PdfShading shading = PdfShading.type3(writer, new CMYKColor(0, 0, 0, 0),
new float[]{0, 0, .096f, 0, 0, 1}, null, function3, new boolean[]{true, true});
PdfContentByte cb = writer.getDirectContent();
cb.moveTo(316.789f, 140.311f);