通过 C++ 使用 JavaScript 获取图表趋势线的方程文本

您可以使用 C++ 通过脚本获取图表趋势线的方程文本。Aspose.Cells 提供了 DataLabels.text 属性，用于返回图表趋势线的方程文本。要使用此属性，首先需要调用 Chart.calculate() 方法。

以下截图显示带有趋势线的图表及其方程文本（红色显示）。我们将在下面的示例代码中使用 DataLabels.text 属性检索这段文本。

todo:image_alt_text

用于获取图表趋势线方程文本的 JavaScript 代码

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Read Trendline Equation 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 } = 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 the first worksheet
            const worksheet = workbook.worksheets.get(0);

            // Access the first chart inside the worksheet
            const chart = worksheet.charts.get(0);

            // Calculate the Chart to get the Equation Text of Trendline
            chart.calculate();

            // Access the Trendline
            const trendLine = chart.nSeries.get(0).trendLines.get(0);

            // Read the Equation Text of Trendline
            const equationText = trendLine.dataLabels.text;

            document.getElementById('result').innerHTML = `<p>Equation Text: ${equationText}</p>`;
        });
    </script>
</html>

示例代码生成的输出

这是上述示例代码的控制台输出。

Equation Text: y = 8.1333x + 5

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