更改 apache poi 为 Excel 工作表生成的图表形状 [英] Changing the shape of chart generated by apache poi for excel sheet

问题描述

我有一个 java 文件，它生成一个包含大量数据的 Excel 工作表.为了获得更好的用户体验，我们决定简单地从数据中生成一个折线图.

I have a java file generating an excel sheet containing a ton of data. For better user experience, we decided to simply generate a line chart out of the data.

生成图表并不困难，但要使其成为我们需要的确切形状却是个问题.目前，图表边框如下所示:

Generating the chart wasn't difficult, but getting it to be the exact shape as we need it is a problem. Currently, the chart border looks like this:

如您所见，边框在拐角处是弯曲的.我希望它看起来像这样:

As you can see, the border is curved at the corner. I want it to look like this:

到目前为止，我还没有找到一种方法来做到这一点.文档对此不是很详细.

So, far I have not been able to find a way to do that. The documentation isn't very detailed about this.

推荐答案

所以在您看来圆角已经过时了?我也是这个观点，但看起来 Microsoft 不是.因为如果在 CTChartSpace 没有设置RoundedCorners，则默认为true.

So in your opinion rounded corners are outdated? I am this opinion too, but as it seems Microsoft is not. Because if in CTChartSpace the RoundedCorners is not set, then it is trueby default.

不过幸运的是，我们可以根据需要使用以下方法进行设置:

But fortunately we can set it as needed using following method:

private static void setRoundedCorners(XSSFChart chart, boolean setVal) {
    if (chart.getCTChartSpace().getRoundedCorners() == null) chart.getCTChartSpace().addNewRoundedCorners();
    chart.getCTChartSpace().getRoundedCorners().setVal(setVal);
}

完整示例:

import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Chart;
import org.apache.poi.ss.usermodel.ClientAnchor;
import org.apache.poi.ss.usermodel.Drawing;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.charts.AxisCrosses;
import org.apache.poi.ss.usermodel.charts.AxisPosition;
import org.apache.poi.ss.usermodel.charts.ChartAxis;
import org.apache.poi.ss.usermodel.charts.ChartDataSource;
import org.apache.poi.ss.usermodel.charts.ChartLegend;
import org.apache.poi.ss.usermodel.charts.DataSources;
import org.apache.poi.ss.usermodel.charts.LegendPosition;
import org.apache.poi.ss.usermodel.charts.LineChartData;
import org.apache.poi.ss.usermodel.charts.ValueAxis;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFChart;

/**
 * Line chart example.
 */
public class LineChart {

    private static void setRoundedCorners(XSSFChart chart, boolean setVal) {
        if (chart.getCTChartSpace().getRoundedCorners() == null) chart.getCTChartSpace().addNewRoundedCorners();
        chart.getCTChartSpace().getRoundedCorners().setVal(setVal);
    }

    public static void main(String[] args) throws IOException {
        Workbook wb = new XSSFWorkbook();
        Sheet sheet = wb.createSheet("linechart");
        final int NUM_OF_ROWS = 3;
        final int NUM_OF_COLUMNS = 10;

        // Create a row and put some cells in it. Rows are 0 based.
        Row row;
        Cell cell;
        for (int rowIndex = 0; rowIndex < NUM_OF_ROWS; rowIndex++) {
            row = sheet.createRow((short) rowIndex);
            for (int colIndex = 0; colIndex < NUM_OF_COLUMNS; colIndex++) {
                cell = row.createCell((short) colIndex);
                cell.setCellValue(colIndex * (rowIndex + 1));
            }
        }

        Drawing<?> drawing = sheet.createDrawingPatriarch();
        ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 5, 10, 15);

        Chart chart = drawing.createChart(anchor);

        setRoundedCorners((XSSFChart)chart, false);

        ChartLegend legend = chart.getOrCreateLegend();
        legend.setPosition(LegendPosition.TOP_RIGHT);

        LineChartData data = chart.getChartDataFactory().createLineChartData();

        // Use a category axis for the bottom axis.
        ChartAxis bottomAxis = chart.getChartAxisFactory().createCategoryAxis(AxisPosition.BOTTOM);
        ValueAxis leftAxis = chart.getChartAxisFactory().createValueAxis(AxisPosition.LEFT);
        leftAxis.setCrosses(AxisCrosses.AUTO_ZERO);

        ChartDataSource<Number> xs = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(0, 0, 0, NUM_OF_COLUMNS - 1));
        ChartDataSource<Number> ys1 = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(1, 1, 0, NUM_OF_COLUMNS - 1));
        ChartDataSource<Number> ys2 = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(2, 2, 0, NUM_OF_COLUMNS - 1));


        data.addSeries(xs, ys1);
        data.addSeries(xs, ys2);

        chart.plot(data, bottomAxis, leftAxis);

        // Write the output to a file
        FileOutputStream fileOut = new FileOutputStream("ooxml-line-chart.xlsx");
        wb.write(fileOut);
        fileOut.close();
        wb.close();
    }
}

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