如何在C++中使用JavaScript创建动态滚动图表
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可能的使用场景
动态滚动图表是一种用于显示随时间变化的数据的图形表示类型。它旨在实时显示数据，使用户能够追踪连续的更新和趋势。随着新增数据的加入，图表将持续更新并自动滚动，以显示最新的信息。
动态滚动图表通常在各个行业中被广泛使用，如金融、股市分析、天气跟踪和社交媒体分析。它们使用户能够可视化和分析数据模式，并基于实时信息做出明智的决策。
这些图表通常是交互式的，允许用户放大或缩小、滚动历史数据和调整时间间隔。它们通常支持多个数据系列，提供不同指标及其相关性的综合视图。
总的来说，动态滚动图表是用于监控和分析时间序列数据的有价值的工具，有助于实时决策和增强数据可视化能力。
使用Aspose.Cells创建动态滚动图表
在接下来的段落中，我们将展示如何使用Aspose.Cells for JavaScript通过C++创建动态滚动图表。我们会提供示例代码和所生成的Excel文件。
示例代码
以下示例代码将生成动态滚动图表文件。
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example</title>
</head>
<body>
<h1>Dynamic Scrolling 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, Utils, 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 and access the first worksheet.
const workbook = new Workbook();
const sheets = workbook.worksheets;
const sheet = sheets.get(0);
// Populate the data for the chart. Add values to cells and set series names.
sheet.cells.get("A1").value = "Day";
sheet.cells.get("B1").value = "Sales";
// In this example, we will add 30 days of data
const allDays = 30;
const showDays = 10;
let currentDay = 1;
for (let i = 0; i < allDays; i++) {
const cellA = `A${i + 2}`;
const cellB = `B${i + 2}`;
sheet.cells.get(cellA).value = i + 1;
sheet.cells.get(cellB).value = 50 * (i % 2) + 20 * (i % 3) + 10 * Math.floor(i / 3);
}
// This is the Dynamic Scrolling Control Data
sheet.cells.get("G19").value = "Start Day";
sheet.cells.get("G20").value = currentDay;
sheet.cells.get("H19").value = "Show Days";
sheet.cells.get("H20").value = showDays;
// Set the dynamic range for the chart's data source.
let index = sheets.names.add("Sheet1!ChtScrollData");
sheets.names.get(index).refersTo = "=OFFSET(Sheet1!$B$2,Sheet1!$G$20,0,Sheet1!$H$20,1)";
// Set the dynamic range for the chart's data labels.
index = sheets.names.add("Sheet1!ChtScrollLabels");
sheets.names.get(index).refersTo = "=OFFSET(Sheet1!$A$2,Sheet1!$G$20,0,Sheet1!$H$20,1)";
// Add a ScrollBar for the Dynamic Scrolling Chart
const bar = sheet.shapes.addScrollBar(2, 0, 3, 0, 200, 30);
bar.min = 0;
bar.max = allDays - showDays;
bar.currentValue = currentDay;
bar.linkedCell = "$G$20";
// Create a chart object and set its data source.
const chartIndex = sheet.charts.add(ChartType.Line, 2, 4, 15, 10);
const chart = sheet.charts.get(chartIndex);
chart.nSeries.add("Sales", true);
chart.nSeries.get(0).values = "Sheet1!ChtScrollData";
chart.nSeries.get(0).xValues = "Sheet1!ChtScrollLabels";
// Save the workbook as an Excel file.
const outputData = workbook.save(SaveFormat.Xlsx);
const blob = new Blob([outputData], { type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" });
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'DynamicScrollingChart.xlsx';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Excel File';
document.getElementById('result').innerHTML = '<p style="color: green;">Chart created successfully! Click the download link to get the file.</p>';
});
</script>
</html>
备注
在生成的文件中，您可以操作滚动条，而图表会动态计算最新的10组数据。这是在示例代码中使用“OFFSET”公式完成的：