用JavaScript通过C++自定义图表

创建自定义图表

到目前为止，我们在讨论图表时，常常关注具有标准格式设置的标准图表。我们只定义数据源，设置一些属性，图表便会以默认格式创建。但Aspose.Cells API还支持创建自定义图表，允许开发者使用自定义格式设置来创建图表。

开发人员可以使用Aspose.Cells在运行时创建自定义图表。

图表由数据系列组成。Aspose.Cells中的每个数据系列由Series对象表示，而SeriesCollection对象作为Series对象的集合。当创建定制图表时，开发者可以自由地为不同的数据系列（收集在SeriesCollection对象中）使用不同类型的图表。

下面的示例代码演示了如何创建自定义图表。在此示例中，我们将为第一个数据系列使用柱形图，为第二个系列使用折线图。结果是，我们在工作表中添加了一个柱形图，结合了一条折线图。

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Aspose.Cells 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 } = AsposeCells;

        const readyPromise = 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 () => {
            // Ensure Aspose.Cells is initialized
            await readyPromise;

            // Instantiate a new Workbook
            const workbook = new Workbook();

            // Adding a new worksheet to the Workbook object
            const sheetIndex = workbook.worksheets.add();

            // Obtaining the reference of the newly added worksheet by passing its sheet index
            const worksheet = workbook.worksheets.get(sheetIndex);

            // Adding sample values to cells
            worksheet.cells.get("A1").value = 50;
            worksheet.cells.get("A2").value = 100;
            worksheet.cells.get("A3").value = 150;
            worksheet.cells.get("A4").value = 110;
            worksheet.cells.get("B1").value = 260;
            worksheet.cells.get("B2").value = 12;
            worksheet.cells.get("B3").value = 50;
            worksheet.cells.get("B4").value = 100;

            // Adding a chart to the worksheet
            const chartIndex = worksheet.charts.add(ChartType.Column, 5, 0, 15, 5);

            // Accessing the instance of the newly added chart
            const chart = worksheet.charts.get(chartIndex);

            // Adding NSeries (chart data source) to the chart ranging from "A1" cell to "B4"
            chart.nSeries.add("A1:B4", true);

            // Setting the chart type of 2nd NSeries to display as line chart
            chart.nSeries.get(1).type = ChartType.Line;

            // Saving the Excel file
            const outputData = workbook.save(SaveFormat.Excel97To2003);
            const blob = new Blob([outputData]);
            const downloadLink = document.getElementById('downloadLink');
            downloadLink.href = URL.createObjectURL(blob);
            downloadLink.download = 'output.xls';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download Excel File';

            document.getElementById('result').innerHTML = '<p style="color: green;">Workbook created successfully! Click the download link to get the file.</p>';
        });
    </script>
</html>
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