POI 4.1.0 Line-Chart Y系列显示错误的图例

如何在y系列上创建带有单个图例的折线图，而不是在x系列上显示多个图例bease

int rows = numberOfRows - 1; int cols = headers.size();

XSSFDrawing drawing = sheet.createDrawingPatriarch(); XSSFClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 5, 10, 15); XSSFChart chart = drawing.createChart(anchor); chart.displayBlanksAs(DisplayBlanks.GAP);

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

// Use a category axis for the bottom axis. XDDFCategoryAxis bottomAxis = chart.createCategoryAxis(AxisPosition.BOTTOM); bottomAxis.setOrientation(AxisOrientation.MAX_MIN); bottomAxis.setTitle("Date");

XDDFValueAxis rightAxis = chart.createValueAxis(AxisPosition.RIGHT); rightAxis.setTitle("Rates"); rightAxis.setCrosses(AxisCrosses.AUTO_ZERO);

XDDFChartLegend chartLegend = chart.getOrAddLegend(); chartLegend.setPosition(LegendPosition.TOP_RIGHT); chartLegend.setOverlay(false);

XDDFLineChartData lineChartData = (XDDFLineChartData) chart.createData(ChartTypes.LINE, bottomAxis, rightAxis);

XDDFDataSource xs = XDDFDataSourcesFactory.fromStringCellRange(sheet, new CellRangeAddress(1, rows, 0, 0));

for (int col = 1; col < cols; col++) { XDDFNumericalDataSource ys1 = XDDFDataSourcesFactory.fromNumericCellRange(sheet, new CellRangeAddress(1, rows, col, col)); XDDFLineChartData.Series series1 = (XDDFLineChartData.Series) lineChartData.addSeries(xs, ys1); series1.setTitle(headers.get(col), null); series1.setSmooth(false); series1.setMarkerStyle(MarkerStyle.NONE); }

chart.plot(lineChartData);