使用Node.js via C++向PDF添加水印
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在将Excel文件转换为PDF的同时,可能需要添加水印。以下示例演示如何添加文本和图像水印。
向PDF添加文本水印
只需指定文本和相应的字体,就可以轻松向PDF添加文本水印。也可以设置对齐、偏移、旋转、不透明度、前景/背景和比例到页面,详见 RenderingWatermark。
const AsposeCells = require("aspose.cells.node");
const path = require("path");
// The path to the documents directory.
const dataDir = path.join(__dirname, "data");
const filePath = path.join(dataDir, "sample.xlsx");
// Loads the workbook which contains hidden external links
const workbook = new AsposeCells.Workbook(filePath);
// prepare a workbook with 3 pages.
const wb = new AsposeCells.Workbook();
wb.getWorksheets().get(0).getCells().get("A1").putValue("Page1");
let index = wb.getWorksheets().add();
wb.getWorksheets().get(index).getCells().get("A1").putValue("Page2");
index = wb.getWorksheets().add();
wb.getWorksheets().get(index).getCells().get("A1").putValue("Page3");
wb.getWorksheets().get(index).getPageSetup().setPaperSize(AsposeCells.PaperSizeType.PaperA3);
// create a font for watermark, and specify bold, italic, color.
const font = new AsposeCells.RenderingFont("Calibri", 68);
font.setItalic(true);
font.setBold(true);
font.setColor(AsposeCells.Color.Blue);
// create a watermark from text and the specified font.
const watermark = new AsposeCells.RenderingWatermark("Watermark", font);
// specify horizontal and vertical alignment
watermark.setHAlignment(AsposeCells.TextAlignmentType.Center);
watermark.setVAlignment(AsposeCells.TextAlignmentType.Center);
// specify rotation
watermark.setRotation(30);
// specify opacity
watermark.setOpacity(0.6);
// specify the scale to page(e.g. 100, 50) in percent.
watermark.setScaleToPagePercent(50);
// specify watermark for rendering to pdf.
const options = new AsposeCells.PdfSaveOptions();
options.setWatermark(watermark);
wb.save("output_text_watermark.pdf", options);
向PDF添加图像水印
只需指定图像字节,就可以向PDF添加图像水印。也可以设置对齐、偏移、旋转、不透明度、前景/背景和比例到页面,详见 RenderingWatermark。
const AsposeCells = require("aspose.cells.node");
const path = require("path");
const fs = require("fs");
// The path to the documents directory.
const dataDir = path.join(__dirname, "data");
const filePath = path.join(dataDir, "sample.xlsx");
// Prepare a workbook with 3 pages.
const wb = new AsposeCells.Workbook();
wb.getWorksheets().get(0).getCells().get("A1").putValue("Page1");
let index = wb.getWorksheets().add();
wb.getWorksheets().get(index).getCells().get("A1").putValue("Page2");
index = wb.getWorksheets().add();
wb.getWorksheets().get(index).getCells().get("A1").putValue("Page3");
wb.getWorksheets().get(index).getPageSetup().setPaperSize(AsposeCells.PaperSizeType.PaperA3);
// Create a watermark from image (you need to prepare image bytes).
const imageBytes = fs.readFileSync(path.join(dataDir, "icon.svg"));
const watermark = new AsposeCells.RenderingWatermark(imageBytes);
// Specify offset to alignment.
watermark.setOffsetX(100);
watermark.setOffsetY(200);
// Specify rotation.
watermark.setRotation(30);
// Specify watermark to background.
watermark.setIsBackground(true);
// Specify opacity.
watermark.setOpacity(0.6);
// Specify the scale to page (e.g. 100, 50) in percent.
watermark.setScaleToPagePercent(50);
// Specify watermark for rendering to pdf.
const options = new AsposeCells.PdfSaveOptions();
options.setWatermark(watermark);
wb.save("output_image_watermark.pdf", options);