Create a small circle in excel POI - excel

Question

I know this question might seem similar but I have different problem. I know how to create a circle or a shape. This is what I want to create
A little circle in the center of the excel cell
The circle that I am able to make, looking at tutorials etc is:
This is the code I am using to create:
CreationHelper helper = workbook.getCreationHelper();
Drawing drawing = worksheet.createDrawingPatriarch();
ClientAnchor anchor = helper.createClientAnchor();
anchor.setCol1(0);
anchor.setRow1(0);
anchor.setCol2(1);
anchor.setRow2(1);
anchor.setDx1(255);
anchor.setDx2(255);
anchor.setDy1(0);
anchor.setDy2(0);
XSSFSimpleShape shape = ((XSSFDrawing)drawing).createSimpleShape((XSSFClientAnchor)anchor);
shape.setShapeType(ShapeTypes.FLOW_CHART_CONNECTOR);
shape.setFillColor(255, 0, 0);
I think there is something to do with the dx1,dx2,dy1,dy2 but setting any value in there has no effect.
I need to make that shape smaller somehow

Answer 1

If the shape shall within one cell only then the anchor must also be only one cell. The positioning is done then with Dx and Dy. But the measurement unit is special. It is EMU English Metric Units.
So the positioning of an ellipse in cell A1 will be like so:
import org.apache.poi.xssf.usermodel.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.util.Units;
import java.io.FileOutputStream;
import java.io.IOException;
class CenterShapeInCell {
public static void main(String[] args) {
try {
Workbook workbook = new XSSFWorkbook();
Sheet sheet = workbook.createSheet("Sheet1");
Row row = sheet.createRow(0);
Cell cell = row.createCell(0);
row.setHeight((short)(20*20));
sheet.setColumnWidth(0, 20*256);
CreationHelper helper = workbook.getCreationHelper();
Drawing drawing = sheet.createDrawingPatriarch();
ClientAnchor anchor = helper.createClientAnchor();
//set anchor to A1 only
anchor.setCol1(0);
anchor.setRow1(0);
anchor.setCol2(0);
anchor.setRow2(0);
//get the cell width of A1
float cellWidthPx = sheet.getColumnWidthInPixels(0);
System.out.println(cellWidthPx);
//set wanted shape size
int shapeWidthPx = 20;
int shapeHeightPx = 20;
//calculate the position of left upper edge
float centerPosPx = cellWidthPx/2f - (float)shapeWidthPx/2f;
System.out.println(centerPosPx);
//set the position of left edge as Dx1 in unit EMU
anchor.setDx1(Math.round(centerPosPx * Units.EMU_PER_PIXEL));
//set the position of right edge as Dx2 in unit EMU
anchor.setDx2(Math.round((centerPosPx + shapeWidthPx) * Units.EMU_PER_PIXEL));
//set upper padding
int upperPaddingPx = 4;
//set upper padding as Dy1 in unit EMU
anchor.setDy1(upperPaddingPx * Units.EMU_PER_PIXEL);
//set upper padding + shape height as Dy2 in unit EMU
anchor.setDy2((upperPaddingPx + shapeHeightPx) * Units.EMU_PER_PIXEL);
XSSFSimpleShape shape = ((XSSFDrawing)drawing).createSimpleShape((XSSFClientAnchor)anchor);
shape.setShapeType(ShapeTypes.ELLIPSE);
shape.setFillColor(255, 0, 0);
FileOutputStream fileOut = new FileOutputStream("CenterShapeInCell.xlsx");
workbook.write(fileOut);
fileOut.close();
} catch (IOException ioex) {
}
}
}
Looks like:
But I suspect what you really want is a conditional formatting with traffic light symbols like so:
import org.apache.poi.xssf.usermodel.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import java.io.FileOutputStream;
import java.io.IOException;
class ConditionalFormattingIconSet {
public static void main(String[] args) {
try {
Workbook workbook = new XSSFWorkbook();
Sheet sheet = workbook.createSheet("Sheet1");
CellStyle cellStyle = workbook.createCellStyle();
//cellStyle.setAlignment(CellStyle.ALIGN_CENTER); // old apache poi versions
cellStyle.setAlignment(HorizontalAlignment.CENTER); // current apache poi version 4.1.0
//cellStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER); // old apache poi versions
cellStyle.setVerticalAlignment(VerticalAlignment.CENTER); // current apache poi version 4.1.0
Cell cell;
for (int i = 0; i < 3; i++) {
cell = sheet.createRow(i).createCell(0);
cell.setCellValue(1+i);
cell.setCellStyle(cellStyle);
}
SheetConditionalFormatting sheetCF = sheet.getSheetConditionalFormatting();
ConditionalFormattingRule rule = sheetCF.createConditionalFormattingRule(IconMultiStateFormatting.IconSet.GYR_3_TRAFFIC_LIGHTS);
rule.getMultiStateFormatting().setIconOnly(true);
ConditionalFormattingRule [] cfRules = {rule};
CellRangeAddress[] regions = {CellRangeAddress.valueOf("A1:A3")};
sheetCF.addConditionalFormatting(regions, cfRules);
FileOutputStream fileOut = new FileOutputStream("ConditionalFormattingIconSet.xlsx");
workbook.write(fileOut);
fileOut.close();
} catch (IOException ioex) {
}
}
}
Looks like: