Esporta grafico in SVG con attributo viewBox usando JavaScript tramite C++
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Per impostazione predefinita, quando il grafico viene esportato nel formato SVG, l’attributo viewBox non è incluso nel suo XML. Tuttavia, Aspose.Cells fornisce ImageOrPrintOptions.svgFitToViewPort proprietà che, quando impostata su true, esporta il grafico in SVG con l’attributo viewBox.
Esportare il grafico in SVG con attributo viewBox
Il seguente codice di esempio esporta il grafico nel formato SVG con l’attributo viewBox.
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Chart to SVG Example</title>
</head>
<body>
<h1>Chart to SVG Example</h1>
<input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
<button id="runExample">Convert Chart to SVG</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, ImageOrPrintOptions, ImageType, Utils } = 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();
// Create 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);
// Set image or print options with SVGFitToViewPort true
const opts = new ImageOrPrintOptions();
opts.imageType = ImageType.Svg;
opts.svgFitToViewPort = true;
// Save the chart to svg format (returns data in browser)
const svgData = await chart.toImage(opts);
// Create blob and download link for SVG
const blob = new Blob([svgData], { type: 'image/svg+xml' });
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'Image_out.svg';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download SVG File';
document.getElementById('result').innerHTML = '<p style="color: green;">Chart converted to SVG successfully! Click the download link to get the SVG file.</p>';
});
</script>
</html>
Se apri l’SVG del grafico in notepad, troverai l’attributo viewBox simile a questo.
<svg xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
<span class="n">width</span><span class="o">=</span><span class="s">"100%"</span> <span class="n">height</span><span class="o">=</span><span class="s">"100%"</span>
<span class="n">viewBox</span><span class="o">=</span><span class="s">"0 0 480 288"</span><span class="o">></span></code></pre></div>