JavaScriptを使った一次軸と二次軸のC++対応
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可能な使用シナリオ
チャート内のデータ系列に数字が大幅に変動したり、データの種類が混在している場合（価格とボリュームなど）、1つ以上のデータ系列をセカンダリ垂直（値）軸にプロットします。セカンダリ垂直軸のスケールは、関連するデータ系列の値を表示します。セカンダリ軸は、列と折れ線グラフが組み合わさったチャートでうまく機能します。
Microsoft Excelのようにプライマリおよびセカンダリ軸を処理する
新しいExcelファイルを作成し、最初のワークシートにチャートの値を配置するサンプルコードをご覧ください。 次にチャートを追加し、セカンダリ軸を表示します。
サンプルコード
<!DOCTYPE html>
<html>
<head>
<title>Aspose.Cells Example</title>
</head>
<body>
<h1>Primary and Secondary Axis 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, LegendPositionType, FillType, 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();
// Instantiating a Workbook object from the uploaded file
const workbook = new Workbook(new Uint8Array(arrayBuffer));
// Access the first worksheet.
const worksheet = workbook.worksheets.get(0);
// Put the sample values used in a chart
worksheet.cells.get("A1").value = "Region";
worksheet.cells.get("A2").value = "Peking";
worksheet.cells.get("A3").value = "New York";
worksheet.cells.get("A4").value = "Paris";
worksheet.cells.get("B1").value = "Sales Volume";
worksheet.cells.get("C1").value = "Growth Rate";
worksheet.cells.get("B2").value = 100;
worksheet.cells.get("B3").value = 80;
worksheet.cells.get("B4").value = 140;
worksheet.cells.get("C2").value = 0.7;
worksheet.cells.get("C3").value = 0.8;
worksheet.cells.get("C4").value = 1.0;
// Create a Scatter chart
const pieIdx = worksheet.charts.add(ChartType.Scatter, 6, 6, 15, 11);
// Retrieve the Chart object
const chart = worksheet.charts.get(pieIdx);
// Add Series
chart.nSeries.add("B2:C4", true);
// Set the category data
chart.nSeries.categoryData = "=Sheet1!$A$2:$A$4";
// Set the Second-Axis
chart.nSeries.get(1).plotOnSecondAxis = true;
// Show the Second-Axis
chart.secondValueAxis.isVisible = true;
// Set the second series ChartType to line
chart.nSeries.get(1).type = ChartType.Line;
// Set the series name
chart.nSeries.get(0).name = "Sales Volume";
chart.nSeries.get(1).name = "Growth Rate";
// Set the Legend at the bottom of the chart area
chart.legend.position = LegendPositionType.Bottom;
// Fill the PlotArea area with nothing
chart.plotArea.area.fillFormat.fillType = FillType.None;
// Save the file
const outputData = workbook.save(SaveFormat.Xlsx);
const blob = new Blob([outputData]);
const downloadLink = document.getElementById('downloadLink');
downloadLink.href = URL.createObjectURL(blob);
downloadLink.download = 'PrimaryandSecondaryAxis.xlsx';
downloadLink.style.display = 'block';
downloadLink.textContent = 'Download Excel File';
document.getElementById('result').innerHTML = '<p style="color: green;">Operation completed successfully! Click the download link to get the modified file.</p>';
});
</script>
</html>