如何在 JavaScript 结合 C++ 中创建 TreeMap 图表
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可能的使用场景
树状图表提供了数据的分级视图，可轻松找出模式，比如哪些项目是商店的畅销品。树的分支由矩形代表，每个子分支显示为较小的矩形。树状图表通过颜色和临近性显示类别，并且可以轻松显示大量数据，这在其他图表类型中可能会很困难。
树状图表
运行下面的代码后，您将会看到如下所示的树状图表。
示例代码
以下示例代码加载 样本 Excel 文件 并生成 输出 Excel 文件。
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Treemap Chart Example</title>
</head>
<body>
<h1>Treemap Chart 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, FillType } = 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();
// Instantiate Workbook with uploaded file
const workbook = new Workbook(new Uint8Array(arrayBuffer));
// Access the first worksheet
const worksheet = workbook.worksheets.get(0);
// Add a Treemap chart at row 5, column 6 with height 20 and width 12
const pieIdx = worksheet.charts.add(ChartType.Treemap, 5, 6, 20, 12);
// Retrieve the Chart object
const chart = worksheet.charts.get(pieIdx);
// Set the legend to be shown
chart.showLegend = true;
// Set the chart title text
chart.title.text = "TreeMap Chart";
// Add series data range (D2:F13)
chart.nSeries.add("D2:F13", true);
// Set category data (A2:C13)
chart.nSeries.setCategoryData("A2:C13");
// Show the DataLabels with category names for first series
chart.nSeries.get(0).dataLabels.showCategoryName = true;
// Fill the PlotArea area with nothing
chart.plotArea.area.fillFormat.fillType = FillType.None;
// Save the modified Excel file and provide download link
const outputData = workbook.save(SaveFormat.Xlsx);
const blob = new Blob([outputData]);
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'out.xlsx';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Modified Excel File';
document.getElementById('result').innerHTML = '<p style="color: green;">Treemap chart created successfully! Click the download link to get the modified file.</p>';
});
</script>
</html>