Question

我正在尝试使用java和Apache POI自动创建报告。我差不多了，但找不到如何在XSSFChart中设置轴标签。

我已经找到了如何设置图表的标题（ Apache POI set Excel chart title）。也许有类似的方法可以解决它，但我不是开发人员，也不知道如何开始。

有人可以帮忙吗？

我的代码到目前为止：

public void grafico(String nomeplanilhadados, String nomeplanilhagrafico, Date datainicial, Date datafinal, String[] nomesmarcos, String titulo){

    if (datainicial.after(datafinal)){
        throw new IllegalArgumentException("A data inicial precisa anteceder a data final");
    }
    Sheet dados = this.wb.getSheet(nomeplanilhadados);
    Sheet planilhagrafico = this.wb.getSheet(nomeplanilhagrafico);
    Drawing drawing = planilhagrafico.createDrawingPatriarch();
    ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 1, 4, 17, 20);
    Chart chart = drawing.createChart(anchor);
    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);
    bottomAxis.setNumberFormat("MMM/yyyy");

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

    //retrieve the data
    int linhainicial=-1;
    int linhafinal=-1;
    Iterator<Row> rowIterator = dados.iterator();
    while(rowIterator.hasNext()){
        Row row = rowIterator.next();
        Cell cell = row.getCell(0);
        if(cell!=null){
            SimpleDateFormat formatodata = new SimpleDateFormat("dd-MM-yyyy");
            Date date=cell.getDateCellValue();

            if (linhainicial==-1 && date.compareTo(datainicial)>=0){
                linhainicial=cell.getRowIndex();
            }
            if( date.compareTo(datafinal)<=0){
                linhafinal=cell.getRowIndex();
            }
        }
    }

    ChartDataSource<Number> xs = DataSources.fromNumericCellRange(dados, new CellRangeAddress(linhainicial, linhafinal, 0, 0));
    Row primeiralinha = dados.getRow(0);
    Iterator<Cell> cellIterator = primeiralinha.iterator();
    while(cellIterator.hasNext()){
        Cell cell=cellIterator.next();
        if(cell!=null && Arrays.asList(nomesmarcos).contains(cell.getStringCellValue())){
            ChartDataSource<Number> ys1 = DataSources.fromNumericCellRange(dados, new CellRangeAddress(linhainicial, linhafinal, cell.getColumnIndex(), cell.getColumnIndex()));
            //data.addSerie(xs, ys1);
            LineChartSerie chartSerie = data.addSerie(xs, ys1);
            chartSerie.setTitle(cell.getStringCellValue());
        }
    }

    XSSFChart xchart = (XSSFChart) chart;
    CTChart ctChart = xchart.getCTChart();
    CTTitle title = ctChart.addNewTitle();
    CTTx tx = title.addNewTx();
    CTTextBody rich = tx.addNewRich();
    rich.addNewBodyPr();  // body properties must exist, but can be empty
    CTTextParagraph para = rich.addNewP();
    CTRegularTextRun r = para.addNewR();
    r.setT(titulo);




    chart.plot(data, bottomAxis, leftAxis);    

}

Answer 1

我不确定你是否得到了答案。我不确定你的问题是什么。我猜你想要设置轴标签，以便你的x轴从最低/最高点开始。你可以用这个

bottomAxis.setCrosses(AxisCrosses.MIN)

或

bottomAxis.setCrosses(AxisCrosses.MAX)

您已在代码中使用过此代码：

bottomAxis.setCrosses(AxisCrosses.AUTO_ZERO)

Answer 2

АлександрКушнир的答案是添加轴标题的好方法，但他给出的方法需要一些修改。

//设置类别轴的标题

public static void setCatAxisTitle(XSSFChart chart, int axisIdx, String title) {
    CTCatAx valAx = chart.getCTChart().getPlotArea().getCatAxArray(axisIdx);
    CTTitle ctTitle = valAx.addNewTitle();
    ctTitle.addNewLayout();
    ctTitle.addNewOverlay().setVal(false);
    CTTextBody rich = ctTitle.addNewTx().addNewRich();
    rich.addNewBodyPr();
    rich.addNewLstStyle();
    CTTextParagraph p = rich.addNewP();
    p.addNewPPr().addNewDefRPr();
    p.addNewR().setT(title);
    p.addNewEndParaRPr();
}


public static void setValueAxisTitle(XSSFChart chart, int axisIdx, String title) {
    CTValAx valAx = chart.getCTChart().getPlotArea().getValAxArray(axisIdx);
    CTTitle ctTitle = valAx.addNewTitle();
    ctTitle.addNewLayout();
    ctTitle.addNewOverlay().setVal(false);
    CTTextBody rich = ctTitle.addNewTx().addNewRich();
    rich.addNewBodyPr();
    rich.addNewLstStyle();
    CTTextParagraph p = rich.addNewP();
    p.addNewPPr().addNewDefRPr();
    p.addNewR().setT(title);
    p.addNewEndParaRPr();
}

//使用底轴的类别轴。

 ChartAxis bottomAxis =chart.getChartAxisFactory().createCategoryAxis(AxisPosition.BOTTOM);
 ValueAxis leftAxis =chart.getChartAxisFactory().createValueAxis(AxisPosition.LEFT);

//但我找不到获得axisIdx的好方法。如果绘图区域只有一个图表，你可以像这样设置轴标题。

setValueAxisTitle(xchart,0,"title of bottom axis");
 setCatAxisTitle(xchart,0, "title of left axis");

如何使用Apache Poi在折线图中设置轴标签

2 个答案: