poi/src/ooxml/testcases/org/apache/poi/xssf/usermodel/extensions/TestXSSFCellFill.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.xssf.usermodel.extensions;


import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;

import java.io.IOException;

import org.apache.poi.ss.usermodel.FillPatternType;
import org.apache.poi.xssf.XSSFTestDataSamples;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFColor;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.junit.Test;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTColor;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTFill;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTPatternFill;
import org.openxmlformats.schemas.spreadsheetml.x2006.main.STPatternType;


public class TestXSSFCellFill {

    @Test
    public void testGetFillBackgroundColor() {
        CTFill ctFill = CTFill.Factory.newInstance();
        XSSFCellFill cellFill = new XSSFCellFill(ctFill, null);
        CTPatternFill ctPatternFill = ctFill.addNewPatternFill();
        CTColor bgColor = ctPatternFill.addNewBgColor();
        assertNotNull(cellFill.getFillBackgroundColor());
        bgColor.setIndexed(2);
        assertEquals(2, cellFill.getFillBackgroundColor().getIndexed());
    }

    @Test
    public void testGetFillForegroundColor() {
        CTFill ctFill = CTFill.Factory.newInstance();
        XSSFCellFill cellFill = new XSSFCellFill(ctFill, null);
        CTPatternFill ctPatternFill = ctFill.addNewPatternFill();
        CTColor fgColor = ctPatternFill.addNewFgColor();
        assertNotNull(cellFill.getFillForegroundColor());
        fgColor.setIndexed(8);
        assertEquals(8, cellFill.getFillForegroundColor().getIndexed());
    }

    @Test
    public void testGetSetPatternType() {
        CTFill ctFill = CTFill.Factory.newInstance();
        XSSFCellFill cellFill = new XSSFCellFill(ctFill, null);
        CTPatternFill ctPatternFill = ctFill.addNewPatternFill();
        ctPatternFill.setPatternType(STPatternType.SOLID);
        assertEquals(FillPatternType.SOLID_FOREGROUND.ordinal(), cellFill.getPatternType().intValue()-1);
    }

    @Test
    public void testGetNotModifies() {
        CTFill ctFill = CTFill.Factory.newInstance();
        XSSFCellFill cellFill = new XSSFCellFill(ctFill, null);
        CTPatternFill ctPatternFill = ctFill.addNewPatternFill();
        ctPatternFill.setPatternType(STPatternType.DARK_DOWN);
        assertEquals(8, cellFill.getPatternType().intValue());
    }

    @Test
    public void testColorFromTheme() throws IOException {
        XSSFWorkbook wb = XSSFTestDataSamples.openSampleWorkbook("styles.xlsx");
        XSSFCell cellWithThemeColor = wb.getSheetAt(0).getRow(10).getCell(0);
        //color RGB will be extracted from theme
        XSSFColor foregroundColor = cellWithThemeColor.getCellStyle().getFillForegroundXSSFColor();
        byte[] rgb = foregroundColor.getRGB();
        byte[] rgbWithTint = foregroundColor.getRGBWithTint();
        // Dk2
        assertEquals(rgb[0],31);
        assertEquals(rgb[1],73);
        assertEquals(rgb[2],125);
        // Dk2, lighter 40% (tint is about 0.39998)
        // 31 * (1.0 - 0.39998) + (255 - 255 * (1.0 - 0.39998)) = 120.59552 => 120 (byte)
        // 73 * (1.0 - 0.39998) + (255 - 255 * (1.0 - 0.39998)) = 145.79636 => -111 (byte)
        // 125 * (1.0 - 0.39998) + (255 - 255 * (1.0 - 0.39998)) = 176.99740 => -80 (byte)
        assertEquals(rgbWithTint[0],120);
        assertEquals(rgbWithTint[1],-111);
        assertEquals(rgbWithTint[2],-80);
        wb.close();
    }
}