我使用的是POI 3.12-beta1,并且代码可以在图例中创建包含多个数据集和命名系列的折线图.但是,poi中折线图的默认设置会生成一条已在数据点上平滑的线.空值也被绘制为0,但我们希望这些线在第一列停止,其中有一个空单元格.

一旦在xlsx文件中呈现并更改这些设置,我就可以进入图表属性,但我们需要使用这些设置渲染xlsx.我在可用的API中找不到任何更改这些设置的内容.

Drawing drawing = sheet.createDrawingPatriarch();

ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 0, 17, 18, 30);

Chart chart = drawing.createChart(anchor);

ChartLegend legend = chart.getOrCreateLegend();

legend.setPosition(LegendPosition.RIGHT);

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

ChartAxis bottomAxis = chart.getChartAxisFactory().createCategoryAxis(AxisPosition.BOTTOM);

ValueAxis leftAxis = chart.getChartAxisFactory().createValueAxis(AxisPosition.LEFT);

leftAxis.setCrosses(AxisCrosses.AUTO_ZERO);

int row = 2;

int startCol = 3;

int endCol = 17;

boolean abs = false;

ChartDataSource xs = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(row, row, startCol, endCol));

row = 10;

int seriesCol = 0;

ChartDataSource ys1 = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(row, row, startCol, endCol));

LineChartSerie ser1 = data.addSerie(xs, ys1);

ser1.setTitle(new CellReference(sheet.getSheetName(), row, seriesCol, abs, abs));

row = 11;

ChartDataSource ys2 = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(row, row, startCol, endCol));

LineChartSerie ser2 = data.addSerie(xs, ys2);

ser2.setTitle(new CellReference(sheet.getSheetName(), row, seriesCol, abs, abs));

row = 12;

ChartDataSource ys3 = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(row, row, startCol, endCol));

LineChartSerie ser3 = data.addSerie(xs, ys3);

ser3.setTitle(new CellReference(sheet.getSheetName(), row, seriesCol, abs, abs));

chart.plot(data, new ChartAxis[] { bottomAxis, leftAxis });