通过 JavaScript 及 C++ 将图表转换为 PDF 文件
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将图表渲染为PDF
为了将图表渲染为PDF格式，Aspose.Cells API提供了Chart.toPdf(string)方法，可以将生成的PDF存储在磁盘路径或Stream中。
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example - Chart to PDF</title>
</head>
<body>
<h1>Chart to PDF Example</h1>
<input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
<button id="runExample">Run Example</button>
<a id="downloadLink" style="display: none;">Download Result</a>
<div id="result"></div>
</body>
<script src="aspose.cells.js.min.js"></script>
<script type="text/javascript">
const { Workbook, SaveFormat, ChartType } = AsposeCells;
AsposeCells.onReady({
license: "/lic/aspose.cells.enc",
fontPath: "/fonts/",
fontList: [
"arial.ttf",
"NotoSansSC-Regular.ttf"
]
}).then(() => {
console.log("Aspose.Cells initialized");
});
document.getElementById('runExample').addEventListener('click', async () => {
// Create a new workbook
const workbook = new Workbook();
// Add a new worksheet
const sheetIndex = workbook.worksheets.add();
const worksheet = workbook.worksheets.get(sheetIndex);
// Adding sample values to cells
worksheet.cells.get("A1").value = 50;
worksheet.cells.get("A2").value = 100;
worksheet.cells.get("A3").value = 150;
worksheet.cells.get("B1").value = 4;
worksheet.cells.get("B2").value = 20;
worksheet.cells.get("B3").value = 50;
// Adding a chart to the worksheet
const chartIndex = worksheet.charts.add(ChartType.Column, 5, 0, 15, 5);
const chart = worksheet.charts.get(chartIndex);
// Adding Series Collection (chart data source) to the chart ranging from "A1" cell to "B3"
chart.nSeries.add("A1:B3", true);
// Converting chart to PDF
const outputData = chart.toPdf();
const blob = new Blob([outputData], { type: 'application/pdf' });
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'chartPDF_out.pdf';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Chart PDF';
document.getElementById('result').innerHTML = '<p style="color: green;">Chart converted to PDF successfully! Click the download link to get the PDF.</p>';
});
</script>
</html>
使用所需的页面大小创建图表PDF
你可以使用Aspose.Cells创建符合你需求的页面大小的图表PDF，并指定图表在页面内的对齐方式（如顶部、底部、居中、左侧、右侧等）。输出图表可以保存在Stream中或存储在磁盘上。以下示例加载示例Excel文件，访问工作表内的第一个图表，然后转换为输出PDF，并设置所需的页面尺寸。截图显示输出PDF的页面尺寸为7x7，符合代码中的规格，图表水平和垂直均居中。
示例代码
<!DOCTYPE html>
<html>
<head>
<title>Create Chart PDF With Desired Page Size</title>
</head>
<body>
<h1>Create Chart PDF With Desired Page Size</h1>
<input type="file" id="fileInput" accept=".xls,.xlsx,.xlsm" />
<button id="runExample">Run Example</button>
<a id="downloadLink" style="display: none;">Download Result</a>
<div id="result"></div>
</body>
<script src="aspose.cells.js.min.js"></script>
<script type="text/javascript">
const { Workbook, SaveFormat } = AsposeCells;
AsposeCells.onReady({
license: "/lic/aspose.cells.enc",
fontPath: "/fonts/",
fontList: [
"arial.ttf",
"NotoSansSC-Regular.ttf"
]
}).then(() => {
console.log("Aspose.Cells initialized");
});
document.getElementById('runExample').addEventListener('click', async () => {
const fileInput = document.getElementById('fileInput');
if (!fileInput.files.length) {
document.getElementById('result').innerHTML = '<p style="color: red;">Please select an Excel file.</p>';
return;
}
const file = fileInput.files[0];
const arrayBuffer = await file.arrayBuffer();
// Instantiating a Workbook object from uploaded file
const workbook = new Workbook(new Uint8Array(arrayBuffer));
// Access first worksheet.
const worksheet = workbook.worksheets.get(0);
// Access first chart inside the worksheet.
const chart = worksheet.charts.get(0);
// Create chart pdf with desired page size.
// Note: In browser API omit file path and receive output data (Uint8Array / ArrayBuffer)
const outputData = chart.toPdf(7, 7, AsposeCells.PageLayoutAlignmentType.Center, AsposeCells.PageLayoutAlignmentType.Center);
const blob = new Blob([outputData], { type: 'application/pdf' });
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'outputCreateChartPDFWithDesiredPageSize.pdf';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download PDF File';
document.getElementById('result').innerHTML = '<p style="color: green;">Chart exported to PDF successfully! Click the download link to get the PDF file.</p>';
});
</script>
</html>