如何使用 Apache poi 4.1.2

如何解决如何使用 Apache poi 4.1.2

我使用 POI 4.1.2 创建了 PIE 3D 图表。并且需要为每个图例条目使用特定的颜色 expected like this

我使用的代码在这里，

final XSSFDrawing drawing = sheet2.createDrawingPatriarch();
            final XSSFClientAnchor anchor =
                    drawing.createAnchor(0,4,7,20);
            

            final XSSFChart chart = drawing.createChart(anchor);
            chart.setTitleText("Unit Build Procurement");
            chart.setTitleOverlay(false);

            final XDDFChartLegend legend = chart.getOrAddLegend();
            legend.setPosition(LegendPosition.TOP_RIGHT);

            final XDDFDataSource<String> dataSource =
                    XDDFDataSourcesFactory.fromStringCellRange(sheet2,new CellRangeAddress(0,3));

            final XDDFNumericalDataSource<Double> values =
                    XDDFDataSourcesFactory.fromNumericCellRange(sheet2,new CellRangeAddress(1,sheet2.getLastRowNum(),3));

            final XDDFChartData data =
                    chart.createData(ChartTypes.PIE3D,null,null);
            data.setVaryColors(true);
            data.addSeries(dataSource,values);
            chart.plot(data);

它创建具有随机颜色的图表。

预先感谢您的帮助。

解决方法

直到现在还没有 XDDF 方法来设置数据点颜色。只能使用 XDDF 方法设置系列颜色。所以必须使用底层的 org.openxmlformats.schemas.drawingml.x2006.chart.* 类。以下完整示例显示了这一点。它从一堆以前设置的 rgb 字节数组中设置数据点颜色。

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

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xddf.usermodel.chart.ChartTypes;
import org.apache.poi.xddf.usermodel.chart.LegendPosition;
import org.apache.poi.xddf.usermodel.chart.XDDFChartData;
import org.apache.poi.xddf.usermodel.chart.XDDFChartLegend;
import org.apache.poi.xddf.usermodel.chart.XDDFDataSource;
import org.apache.poi.xddf.usermodel.chart.XDDFDataSourcesFactory;
import org.apache.poi.xddf.usermodel.chart.XDDFNumericalDataSource;
import org.apache.poi.xddf.usermodel.chart.XDDFPieChartData;
import org.apache.poi.xssf.usermodel.XSSFChart;
import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
import org.apache.poi.xssf.usermodel.XSSFDrawing;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class Pie3DChart {

  public static void main(String[] args) throws IOException {

    Object[][] data = new Object[][] {
     new Object[] {"Country","Count"},new Object[] {"India",13d},new Object[] {"USA",5d},new Object[] {"England",12d},new Object[] {"South Africa",10d}
    };
    
    try (XSSFWorkbook wb = new XSSFWorkbook()) {
      XSSFSheet sheet = wb.createSheet("piechart");
      final int NUM_OF_ROWS = data.length;
      final int NUM_OF_COLUMNS = 2;

      // create sheet data
      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);
          Object cellValue = data[rowIndex][colIndex];
          if (cellValue instanceof String) {
            cell.setCellValue((String)cellValue);
          } else if (cellValue instanceof Double) {
            cell.setCellValue((Double)cellValue);
          }
        }
      }

      // create drawing and anchor
      XSSFDrawing drawing = sheet.createDrawingPatriarch();
      XSSFClientAnchor anchor = drawing.createAnchor(0,3,1,12,15);

      // create chart
      XSSFChart chart = drawing.createChart(anchor);
      chart.setTitleText("Countries");
      chart.setTitleOverlay(false);
      XDDFChartLegend legend = chart.getOrAddLegend();
      legend.setPosition(LegendPosition.TOP_RIGHT);

      XDDFDataSource<String> cat = XDDFDataSourcesFactory.fromStringCellRange(sheet,new CellRangeAddress(1,NUM_OF_ROWS - 1,0));
      XDDFNumericalDataSource<Double> val = XDDFDataSourcesFactory.fromNumericCellRange(sheet,1));

      XDDFChartData chartData = chart.createData(ChartTypes.PIE3D,null,null);
      chartData.setVaryColors(true);
      XDDFChartData.Series series = chartData.addSeries(cat,val);
      chart.plot(chartData);

      // do not auto delete the title; is necessary for showing title in Calc
      if (chart.getCTChart().getAutoTitleDeleted() == null) chart.getCTChart().addNewAutoTitleDeleted();
      chart.getCTChart().getAutoTitleDeleted().setVal(false);

      // data point colors; is necessary for showing data points in Calc
      // some rgb colors to choose
      byte[][] colors = new byte[][] {
        new byte[] {127,(byte)255,127},new byte[] {(byte)200,(byte)200,(byte)200},new byte[] {(byte)255,127,0},new byte[] {0,(byte)255},new byte[] {80,80,80}
      };
      // set data point colors
      int pointCount = series.getCategoryData().getPointCount();
      for (int p = 0; p < pointCount; p++) {
        chart.getCTChart().getPlotArea().getPie3DChartArray(0).getSerArray(0).addNewDPt().addNewIdx().setVal(p);
        chart.getCTChart().getPlotArea().getPie3DChartArray(0).getSerArray(0).getDPtArray(p)
          .addNewSpPr().addNewSolidFill().addNewSrgbClr().setVal(colors[p]);
      }
 
      // write the output to a file
      try (FileOutputStream fileOut = new FileOutputStream("ooxml-pie-chart.xlsx")) {
        wb.write(fileOut);
      }
    }
  }
}