Published 21 Aug, 2022

Java - Change colors of line chart Apache POI

Category Java
Modified : Sep 29, 2022
48

I've generated a line chart using Apache POI. I need to change the default colors I got in the chart. Can I use RGB codes to define specific colors to each line?

My code is as follows.

Drawing drawing = sheet4.createDrawingPatriarch();
ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 1, 1, 17, 22);

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);

ChartDataSource<Number> xs = DataSources.fromNumericCellRange(sheet1, new CellRangeAddress(1, 380, 0, 0));
ChartDataSource<Number> ys1 = DataSources.fromNumericCellRange(sheet1, new CellRangeAddress(1, 380, 1, 1));
ChartDataSource<Number> ys2 = DataSources.fromNumericCellRange(sheet1, new CellRangeAddress(1, 380, 3, 3));
ChartDataSource<Number> ys3 = DataSources.fromNumericCellRange(sheet1, new CellRangeAddress(1, 380, 4, 4));
ChartDataSource<Number> ys4 = DataSources.fromNumericCellRange(sheet1, new CellRangeAddress(1, 380, 8, 8));

LineChartSeries series1 = data.addSeries(xs, ys1);
series1.setTitle("Value 1");
LineChartSeries series2 = data.addSeries(xs, ys2);
series2.setTitle("Value 2");
LineChartSeries series3 = data.addSeries(xs, ys3);
series3.setTitle("Value 3");
LineChartSeries series4 = data.addSeries(xs, ys4);
series4.setTitle("Value 4");

chart.plot(data, bottomAxis, leftAxis);

XSSFChart xssfChart = (XSSFChart) chart;
CTPlotArea plotArea = xssfChart.getCTChart().getPlotArea();
plotArea.getLineChartArray()[0].getSmooth();
CTBoolean ctBool = CTBoolean.Factory.newInstance();
ctBool.setVal(false);
plotArea.getLineChartArray()[0].setSmooth(ctBool);
for (CTLineSer ser : plotArea.getLineChartArray()[0].getSerArray()) {
    ser.setSmooth(ctBool);
}

Answers

There are 2 suggested solutions here and each one has been listed below with a detailed description. The following topics have been covered briefly such as Charts, Java, Excel, Apache Poi. These have been categorized in sections for a clear and precise explanation.

36

I am always a friend of complete examples. Then others can reproducing this and don't need guess how the Excel sheet might look like.

The following complete example does creating a new Excel workbook in Office Open XML format (*.xlsx) having a sheet containing some example data and the line chart.

First code part creates a line chart how apache poi version 3.17 creates it per default.

Then in second code part, I do customizing the chart. The code parts are commented to show what they shall do. After that customizing the chart also is OpenOffice / Libreoffice Calc compatible. The apache poi default charts are not OpenOffice / Libreoffice Calc compatible. At least up to version 3.17.

For customizing one needs knowledge about the internal low level objects apache poi uses as basic objects. Those are contained in ooxml-schemas-1.3.jar . Unfortunately there is not more a API doc public available. So one must download ooxml-schemas-1.3-sources.jar and then do javadoc one's own to get a documentation.

Also one should know that files in Office Open XML format (*.xlsx) simply are ZIP archives. So one can unzip them and have a look at /xl/charts/chart1.xml. When one does this after apache poi has created the chart and do comparing that XML with the XML after re-saving after done the wanted changings in Excel, then one will see the needed XML changings.

Example:

import java.io.FileOutputStream;

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.usermodel.charts.*;
import org.apache.poi.xssf.usermodel.*;

import org.apache.poi.ss.util.CellRangeAddress;

import org.apache.poi.util.Units;

public class CreateExcelLineChartAndCustomize {

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

  Workbook wb = new XSSFWorkbook();
  Sheet sheet = wb.createSheet("linechart");
  final int NUM_OF_ROWS = 100;
  final int NUM_OF_COLUMNS = 5;

  // create some data
  Row row;
  Cell cell;
  String[] headings = new String []{"x", "sin(x)", "cos(x)", "random", "random/x"};
  for (int rowIndex = 0; rowIndex < 1; rowIndex++) {
   row = sheet.createRow(rowIndex);
   for (int colIndex = 0; colIndex < NUM_OF_COLUMNS; colIndex++) {
    cell = row.createCell(colIndex);
    cell.setCellValue(headings[colIndex]);
   }
  }
  for (int rowIndex = 1; rowIndex < NUM_OF_ROWS; rowIndex++) {
   row = sheet.createRow(rowIndex);
   for (int colIndex = 0; colIndex < NUM_OF_COLUMNS; colIndex++) {
    cell = row.createCell(colIndex);
    switch (colIndex) {
     case 0:
      cell.setCellValue(rowIndex/10d);
      break;
     case 1:
      cell.setCellFormula("SIN(A" + (rowIndex+1) + ")");
      break;
     case 2:
      cell.setCellFormula("COS(A" + (rowIndex+1) + ")");
      break;
     case 3:
      cell.setCellFormula("RAND()");
      break;
     case 4:
      cell.setCellFormula("-D"+(rowIndex+1));
      break;
     default:
    }
   }
  }

  // create default chart
  Drawing<?> drawing = sheet.createDrawingPatriarch();
  ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, 6, 1, 15, 21);

  Chart chart = drawing.createChart(anchor);
  ChartLegend legend = chart.getOrCreateLegend();
  legend.setPosition(LegendPosition.RIGHT);

  if (chart instanceof XSSFChart) ((XSSFChart)chart).setTitleText("Some lines");

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

  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(1, 99, 0, 0));
  ChartDataSource<Number> ys1 = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(1, 99, 1, 1));
  ChartDataSource<Number> ys2 = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(1, 99, 2, 2));
  ChartDataSource<Number> ys3 = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(1, 99, 3, 3));
  ChartDataSource<Number> ys4 = DataSources.fromNumericCellRange(sheet, new CellRangeAddress(1, 99, 4, 4));

  LineChartSeries series1 = data.addSeries(xs, ys1);
  series1.setTitle("Value 1");
  LineChartSeries series2 = data.addSeries(xs, ys2);
  series2.setTitle("Value 2");
  LineChartSeries series3 = data.addSeries(xs, ys3);
  series3.setTitle("Value 3");
  LineChartSeries series4 = data.addSeries(xs, ys4);
  series4.setTitle("Value 4");

  chart.plot(data, bottomAxis, leftAxis);

  // customize the chart, this also makes it OpenOffice/Libreoffice Calc compatible
  if (chart instanceof XSSFChart) { 

   XSSFChart xssfChart = (XSSFChart)chart;

   // do not auto delete the title
   if (xssfChart.getCTChart().getAutoTitleDeleted() == null) xssfChart.getCTChart().addNewAutoTitleDeleted();
   xssfChart.getCTChart().getAutoTitleDeleted().setVal(false);

   // plot area background and border line
   if (xssfChart.getCTChartSpace().getSpPr() == null) xssfChart.getCTChartSpace().addNewSpPr();
   if (xssfChart.getCTChartSpace().getSpPr().getSolidFill() == null) 
    xssfChart.getCTChartSpace().getSpPr().addNewSolidFill();
   if (xssfChart.getCTChartSpace().getSpPr().getSolidFill().getSrgbClr() == null)
    xssfChart.getCTChartSpace().getSpPr().getSolidFill().addNewSrgbClr();
   xssfChart.getCTChartSpace().getSpPr().getSolidFill().getSrgbClr().setVal(new byte[]{(byte)255,(byte)255,(byte)255});
   if (xssfChart.getCTChartSpace().getSpPr().getLn() == null) xssfChart.getCTChartSpace().getSpPr().addNewLn();
   xssfChart.getCTChartSpace().getSpPr().getLn().setW(Units.pixelToEMU(1));
   if (xssfChart.getCTChartSpace().getSpPr().getLn().getSolidFill() == null)
    xssfChart.getCTChartSpace().getSpPr().getLn().addNewSolidFill();
   if (xssfChart.getCTChartSpace().getSpPr().getLn().getSolidFill().getSrgbClr() == null)
    xssfChart.getCTChartSpace().getSpPr().getLn().getSolidFill().addNewSrgbClr();
   xssfChart.getCTChartSpace().getSpPr().getLn().getSolidFill().getSrgbClr().setVal(new byte[]{(byte)0,(byte)0,(byte)0});

   // line style of cat axis
   if (xssfChart.getCTChart().getPlotArea().getCatAxArray(0).getSpPr() == null)
    xssfChart.getCTChart().getPlotArea().getCatAxArray(0).addNewSpPr();
   if (xssfChart.getCTChart().getPlotArea().getCatAxArray(0).getSpPr().getLn() == null)
    xssfChart.getCTChart().getPlotArea().getCatAxArray(0).getSpPr().addNewLn();
   xssfChart.getCTChart().getPlotArea().getCatAxArray(0).getSpPr().getLn().setW(Units.pixelToEMU(1));
   if (xssfChart.getCTChart().getPlotArea().getCatAxArray(0).getSpPr().getLn().getSolidFill() == null)
    xssfChart.getCTChart().getPlotArea().getCatAxArray(0).getSpPr().getLn().addNewSolidFill();
   if (xssfChart.getCTChart().getPlotArea().getCatAxArray(0).getSpPr().getLn().getSolidFill().getSrgbClr() == null)
    xssfChart.getCTChart().getPlotArea().getCatAxArray(0).getSpPr().getLn().getSolidFill().addNewSrgbClr();
   xssfChart.getCTChart().getPlotArea().getCatAxArray(0).getSpPr().getLn().getSolidFill().getSrgbClr()
    .setVal(new byte[]{(byte)0,(byte)0,(byte)0});

   //line style of val axis
   if (xssfChart.getCTChart().getPlotArea().getValAxArray(0).getSpPr() == null)
    xssfChart.getCTChart().getPlotArea().getValAxArray(0).addNewSpPr();
   if (xssfChart.getCTChart().getPlotArea().getValAxArray(0).getSpPr().getLn() == null)
    xssfChart.getCTChart().getPlotArea().getValAxArray(0).getSpPr().addNewLn();
   xssfChart.getCTChart().getPlotArea().getValAxArray(0).getSpPr().getLn().setW(Units.pixelToEMU(1));
   if (xssfChart.getCTChart().getPlotArea().getValAxArray(0).getSpPr().getLn().getSolidFill() == null)
    xssfChart.getCTChart().getPlotArea().getValAxArray(0).getSpPr().getLn().addNewSolidFill();
   if (xssfChart.getCTChart().getPlotArea().getValAxArray(0).getSpPr().getLn().getSolidFill().getSrgbClr() == null)
    xssfChart.getCTChart().getPlotArea().getValAxArray(0).getSpPr().getLn().getSolidFill().addNewSrgbClr();
   xssfChart.getCTChart().getPlotArea().getValAxArray(0).getSpPr().getLn().getSolidFill().getSrgbClr()
    .setVal(new byte[]{(byte)0,(byte)0,(byte)0});

   // line style of the series
   for (int i = 0; i < 4; i++) {
    if (xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(i).getSpPr() == null)
     xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(i).addNewSpPr();
    if (xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(i).getSpPr().getLn() == null)
     xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(i).getSpPr().addNewLn();
    xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(i)
     .getSpPr().getLn().setW(Units.pixelToEMU(3));
    if (xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(i).getSpPr().getLn().getSolidFill() == null)
     xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(i).getSpPr().getLn().addNewSolidFill();
    if (xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(i).getSpPr().getLn().getSolidFill().getSrgbClr() == null)
     xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(i).getSpPr().getLn().getSolidFill().addNewSrgbClr();
   }

   // first series red
   xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(0)
    .getSpPr().getLn().getSolidFill().getSrgbClr().setVal(new byte[]{(byte)255,(byte)0,(byte)0});

   // second series green
   xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(1)
    .getSpPr().getLn().getSolidFill().getSrgbClr().setVal(new byte[]{(byte)0,(byte)255,(byte)0});

   // third series blue
   xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(2)
    .getSpPr().getLn().getSolidFill().getSrgbClr().setVal(new byte[]{(byte)0,(byte)0,(byte)255});

   // fourth series yellow
   xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(3)
    .getSpPr().getLn().getSolidFill().getSrgbClr().setVal(new byte[]{(byte)255,(byte)255,(byte)0});


   // set line data series to not smooth the line
   for (int i = 0; i < 4; i++) {
    if (xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(i).getSmooth() == null)
     xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(i).addNewSmooth();
    xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(i).getSmooth().setVal(false);
   }

   // set or unset tick marks
   for (int i = 0; i < 4; i++) {
    if (xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(i).getMarker() == null)
     xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(i).addNewMarker();
    if (xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(i).getMarker().getSymbol() == null)
     xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(i).getMarker().addNewSymbol();
   }
   // no tick marks
   xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(0).getMarker().getSymbol().setVal(
    org.openxmlformats.schemas.drawingml.x2006.chart.STMarkerStyle.NONE);
   // diamond tick marks
   xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(1).getMarker().getSymbol().setVal(
    org.openxmlformats.schemas.drawingml.x2006.chart.STMarkerStyle.DIAMOND);
   // auto tick marks = marker set but no symbol given
   xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(2).getMarker().unsetSymbol();
   // no tick marks
   xssfChart.getCTChart().getPlotArea().getLineChartArray(0).getSerArray(3).getMarker().getSymbol().setVal(
    org.openxmlformats.schemas.drawingml.x2006.chart.STMarkerStyle.NONE);

  }


  wb.write(new FileOutputStream("CreateExcelLineChartAndCustomize.xlsx"));
  wb.close();

 }

}

Result:

enter image description here


1

Apache POI 4

    private void lineSeriesColor(XDDFChartData.Series series, XDDFColor color) {
        XDDFSolidFillProperties fill = new XDDFSolidFillProperties(color);
        XDDFLineProperties line = new XDDFLineProperties();
        line.setFillProperties(fill);
        XDDFShapeProperties properties = series.getShapeProperties();
        if (properties == null) {
            properties = new XDDFShapeProperties();
        } 
        properties.setLineProperties(line);
        series.setShapeProperties(properties);
    }

    private byte[] hex2Rgb(String colorStr) {
        int r = Integer.valueOf(colorStr.substring(1, 3), 16);
        int g = Integer.valueOf(colorStr.substring(3, 5), 16);
        int b = Integer.valueOf(colorStr.substring(5, 7), 16);      
        return new byte[]{(byte) r, (byte) g, (byte) b};
    }

then

String color = "#0C1111";
lineSeriesColor(series, XDDFColor.from(hex2Rgb(color)));