PhpSpreadsheet/Classes/PHPExcel/Writer/Excel2007/Theme.php

<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2012 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel_Writer_Excel2007
 * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
 * @version    ##VERSION##, ##DATE##
 */


/**
 * PHPExcel_Writer_Excel2007_DocProps
 *
 * @category   PHPExcel
 * @package    PHPExcel_Writer_Excel2007
 * @copyright  Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Writer_Excel2007_Theme extends PHPExcel_Writer_Excel2007_WriterPart
{
	/**
	 * Map of Major fonts to write
	 * @static	array of string
	 *
	 */
	private static $_majorFonts = array(
					'Jpan' => 'ＭＳ Ｐゴシック',
					'Hang' => '맑은 고딕',
					'Hans' => '宋体',
					'Hant' => '新細明體',
					'Arab' => 'Times New Roman',
					'Hebr' => 'Times New Roman',
					'Thai' => 'Tahoma',
					'Ethi' => 'Nyala',
					'Beng' => 'Vrinda',
					'Gujr' => 'Shruti',
					'Khmr' => 'MoolBoran',
					'Knda' => 'Tunga',
					'Guru' => 'Raavi',
					'Cans' => 'Euphemia',
					'Cher' => 'Plantagenet Cherokee',
					'Yiii' => 'Microsoft Yi Baiti',
					'Tibt' => 'Microsoft Himalaya',
					'Thaa' => 'MV Boli',
					'Deva' => 'Mangal',
					'Telu' => 'Gautami',
					'Taml' => 'Latha',
					'Syrc' => 'Estrangelo Edessa',
					'Orya' => 'Kalinga',
					'Mlym' => 'Kartika',
					'Laoo' => 'DokChampa',
					'Sinh' => 'Iskoola Pota',
					'Mong' => 'Mongolian Baiti',
					'Viet' => 'Times New Roman',
					'Uigh' => 'Microsoft Uighur',
					'Geor' => 'Sylfaen',
			);

	/**
	 * Map of Minor fonts to write
	 * @static	array of string
	 *
	 */
	private static $_minorFonts = array(
					'Jpan' => 'ＭＳ Ｐゴシック',
					'Hang' => '맑은 고딕',
					'Hans' => '宋体',
					'Hant' => '新細明體',
					'Arab' => 'Arial',
					'Hebr' => 'Arial',
					'Thai' => 'Tahoma',
					'Ethi' => 'Nyala',
					'Beng' => 'Vrinda',
					'Gujr' => 'Shruti',
					'Khmr' => 'DaunPenh',
					'Knda' => 'Tunga',
					'Guru' => 'Raavi',
					'Cans' => 'Euphemia',
					'Cher' => 'Plantagenet Cherokee',
					'Yiii' => 'Microsoft Yi Baiti',
					'Tibt' => 'Microsoft Himalaya',
					'Thaa' => 'MV Boli',
					'Deva' => 'Mangal',
					'Telu' => 'Gautami',
					'Taml' => 'Latha',
					'Syrc' => 'Estrangelo Edessa',
					'Orya' => 'Kalinga',
					'Mlym' => 'Kartika',
					'Laoo' => 'DokChampa',
					'Sinh' => 'Iskoola Pota',
					'Mong' => 'Mongolian Baiti',
					'Viet' => 'Arial',
					'Uigh' => 'Microsoft Uighur',
					'Geor' => 'Sylfaen',
			);

	/**
	 * Map of core colours
	 * @static	array of string
	 *
	 */
		private static $_colourScheme = array(
					'dk2'		=> '1F497D',
					'lt2'		=> 'EEECE1',
					'accent1'	=> '4F81BD',
					'accent2'	=> 'C0504D',
					'accent3'	=> '9BBB59',
					'accent4'	=> '8064A2',
					'accent5'	=> '4BACC6',
					'accent6'	=> 'F79646',
					'hlink'		=> '0000FF',
					'folHlink'	=> '800080',
			);
			
	/**
	 * Write theme to XML format
	 *
	 * @param 	PHPExcel	$pPHPExcel
	 * @return 	string 		XML Output
	 * @throws 	Exception
	 */
	public function writeTheme(PHPExcel $pPHPExcel = null)
	{
			// Create XML writer
			$objWriter = null;
			if ($this->getParentWriter()->getUseDiskCaching()) {
				$objWriter = new PHPExcel_Shared_XMLWriter(PHPExcel_Shared_XMLWriter::STORAGE_DISK, $this->getParentWriter()->getDiskCachingDirectory());
			} else {
				$objWriter = new PHPExcel_Shared_XMLWriter(PHPExcel_Shared_XMLWriter::STORAGE_MEMORY);
			}

			// XML header
			$objWriter->startDocument('1.0','UTF-8','yes');

			// a:theme
			$objWriter->startElement('a:theme');
			$objWriter->writeAttribute('xmlns:a', 'http://schemas.openxmlformats.org/drawingml/2006/main');
			$objWriter->writeAttribute('name', 'Office Theme');

				// a:themeElements
				$objWriter->startElement('a:themeElements');

					// a:clrScheme
					$objWriter->startElement('a:clrScheme');
					$objWriter->writeAttribute('name', 'Office');

						// a:dk1
						$objWriter->startElement('a:dk1');

							// a:sysClr
							$objWriter->startElement('a:sysClr');
							$objWriter->writeAttribute('val', 'windowText');
							$objWriter->writeAttribute('lastClr', '000000');
							$objWriter->endElement();

						$objWriter->endElement();

						// a:lt1
						$objWriter->startElement('a:lt1');

							// a:sysClr
							$objWriter->startElement('a:sysClr');
							$objWriter->writeAttribute('val', 'window');
							$objWriter->writeAttribute('lastClr', 'FFFFFF');
							$objWriter->endElement();

						$objWriter->endElement();

						// a:dk2
						$this->_writeColourScheme($objWriter);

					$objWriter->endElement();

					// a:fontScheme
					$objWriter->startElement('a:fontScheme');
					$objWriter->writeAttribute('name', 'Office');

						// a:majorFont
						$objWriter->startElement('a:majorFont');
							$this->_writeFonts($objWriter, 'Cambria', self::$_majorFonts);
						$objWriter->endElement();

						// a:minorFont
						$objWriter->startElement('a:minorFont');
							$this->_writeFonts($objWriter, 'Calibri', self::$_minorFonts);
						$objWriter->endElement();

					$objWriter->endElement();

					// a:fmtScheme
					$objWriter->startElement('a:fmtScheme');
					$objWriter->writeAttribute('name', 'Office');

						// a:fillStyleLst
						$objWriter->startElement('a:fillStyleLst');

							// a:solidFill
							$objWriter->startElement('a:solidFill');

								// a:schemeClr
								$objWriter->startElement('a:schemeClr');
								$objWriter->writeAttribute('val', 'phClr');
								$objWriter->endElement();

							$objWriter->endElement();

							// a:gradFill
							$objWriter->startElement('a:gradFill');
							$objWriter->writeAttribute('rotWithShape', '1');

								// a:gsLst
								$objWriter->startElement('a:gsLst');

									// a:gs
									$objWriter->startElement('a:gs');
									$objWriter->writeAttribute('pos', '0');

										// a:schemeClr
										$objWriter->startElement('a:schemeClr');
										$objWriter->writeAttribute('val', 'phClr');

											// a:tint
											$objWriter->startElement('a:tint');
											$objWriter->writeAttribute('val', '50000');
											$objWriter->endElement();

											// a:satMod
											$objWriter->startElement('a:satMod');
											$objWriter->writeAttribute('val', '300000');
											$objWriter->endElement();

										$objWriter->endElement();

									$objWriter->endElement();

									// a:gs
									$objWriter->startElement('a:gs');
									$objWriter->writeAttribute('pos', '35000');

										// a:schemeClr
										$objWriter->startElement('a:schemeClr');
										$objWriter->writeAttribute('val', 'phClr');

											// a:tint
											$objWriter->startElement('a:tint');
											$objWriter->writeAttribute('val', '37000');
											$objWriter->endElement();

											// a:satMod
											$objWriter->startElement('a:satMod');
											$objWriter->writeAttribute('val', '300000');
											$objWriter->endElement();

										$objWriter->endElement();

									$objWriter->endElement();

									// a:gs
									$objWriter->startElement('a:gs');
									$objWriter->writeAttribute('pos', '100000');

										// a:schemeClr
										$objWriter->startElement('a:schemeClr');
										$objWriter->writeAttribute('val', 'phClr');

											// a:tint
											$objWriter->startElement('a:tint');
											$objWriter->writeAttribute('val', '15000');
											$objWriter->endElement();

											// a:satMod
											$objWriter->startElement('a:satMod');
											$objWriter->writeAttribute('val', '350000');
											$objWriter->endElement();

										$objWriter->endElement();

									$objWriter->endElement();

								$objWriter->endElement();

								// a:lin
								$objWriter->startElement('a:lin');
								$objWriter->writeAttribute('ang', '16200000');
								$objWriter->writeAttribute('scaled', '1');
								$objWriter->endElement();

							$objWriter->endElement();

							// a:gradFill
							$objWriter->startElement('a:gradFill');
							$objWriter->writeAttribute('rotWithShape', '1');

								// a:gsLst
								$objWriter->startElement('a:gsLst');

									// a:gs
									$objWriter->startElement('a:gs');
									$objWriter->writeAttribute('pos', '0');

										// a:schemeClr
										$objWriter->startElement('a:schemeClr');
										$objWriter->writeAttribute('val', 'phClr');

											// a:shade
											$objWriter->startElement('a:shade');
											$objWriter->writeAttribute('val', '51000');
											$objWriter->endElement();

											// a:satMod
											$objWriter->startElement('a:satMod');
											$objWriter->writeAttribute('val', '130000');
											$objWriter->endElement();

										$objWriter->endElement();

									$objWriter->endElement();

									// a:gs
									$objWriter->startElement('a:gs');
									$objWriter->writeAttribute('pos', '80000');

										// a:schemeClr
										$objWriter->startElement('a:schemeClr');
										$objWriter->writeAttribute('val', 'phClr');

											// a:shade
											$objWriter->startElement('a:shade');
											$objWriter->writeAttribute('val', '93000');
											$objWriter->endElement();

											// a:satMod
											$objWriter->startElement('a:satMod');
											$objWriter->writeAttribute('val', '130000');
											$objWriter->endElement();

										$objWriter->endElement();

									$objWriter->endElement();

									// a:gs
									$objWriter->startElement('a:gs');
									$objWriter->writeAttribute('pos', '100000');

										// a:schemeClr
										$objWriter->startElement('a:schemeClr');
										$objWriter->writeAttribute('val', 'phClr');

											// a:shade
											$objWriter->startElement('a:shade');
											$objWriter->writeAttribute('val', '94000');
											$objWriter->endElement();

											// a:satMod
											$objWriter->startElement('a:satMod');
											$objWriter->writeAttribute('val', '135000');
											$objWriter->endElement();

										$objWriter->endElement();

									$objWriter->endElement();

								$objWriter->endElement();

								// a:lin
								$objWriter->startElement('a:lin');
								$objWriter->writeAttribute('ang', '16200000');
								$objWriter->writeAttribute('scaled', '0');
								$objWriter->endElement();

							$objWriter->endElement();

						$objWriter->endElement();

						// a:lnStyleLst
						$objWriter->startElement('a:lnStyleLst');

							// a:ln
							$objWriter->startElement('a:ln');
							$objWriter->writeAttribute('w', '9525');
							$objWriter->writeAttribute('cap', 'flat');
							$objWriter->writeAttribute('cmpd', 'sng');
							$objWriter->writeAttribute('algn', 'ctr');

								// a:solidFill
								$objWriter->startElement('a:solidFill');

									// a:schemeClr
									$objWriter->startElement('a:schemeClr');
									$objWriter->writeAttribute('val', 'phClr');

											// a:shade
											$objWriter->startElement('a:shade');
											$objWriter->writeAttribute('val', '95000');
											$objWriter->endElement();

											// a:satMod
											$objWriter->startElement('a:satMod');
											$objWriter->writeAttribute('val', '105000');
											$objWriter->endElement();

									$objWriter->endElement();

								$objWriter->endElement();

								// a:prstDash
								$objWriter->startElement('a:prstDash');
								$objWriter->writeAttribute('val', 'solid');
								$objWriter->endElement();

							$objWriter->endElement();

							// a:ln
							$objWriter->startElement('a:ln');
							$objWriter->writeAttribute('w', '25400');
							$objWriter->writeAttribute('cap', 'flat');
							$objWriter->writeAttribute('cmpd', 'sng');
							$objWriter->writeAttribute('algn', 'ctr');

								// a:solidFill
								$objWriter->startElement('a:solidFill');

									// a:schemeClr
									$objWriter->startElement('a:schemeClr');
									$objWriter->writeAttribute('val', 'phClr');
									$objWriter->endElement();

								$objWriter->endElement();

								// a:prstDash
								$objWriter->startElement('a:prstDash');
								$objWriter->writeAttribute('val', 'solid');
								$objWriter->endElement();

							$objWriter->endElement();

							// a:ln
							$objWriter->startElement('a:ln');
							$objWriter->writeAttribute('w', '38100');
							$objWriter->writeAttribute('cap', 'flat');
							$objWriter->writeAttribute('cmpd', 'sng');
							$objWriter->writeAttribute('algn', 'ctr');

								// a:solidFill
								$objWriter->startElement('a:solidFill');

									// a:schemeClr
									$objWriter->startElement('a:schemeClr');
									$objWriter->writeAttribute('val', 'phClr');
									$objWriter->endElement();

								$objWriter->endElement();

								// a:prstDash
								$objWriter->startElement('a:prstDash');
								$objWriter->writeAttribute('val', 'solid');
								$objWriter->endElement();

							$objWriter->endElement();

						$objWriter->endElement();



						// a:effectStyleLst
						$objWriter->startElement('a:effectStyleLst');

							// a:effectStyle
							$objWriter->startElement('a:effectStyle');

								// a:effectLst
								$objWriter->startElement('a:effectLst');

									// a:outerShdw
									$objWriter->startElement('a:outerShdw');
									$objWriter->writeAttribute('blurRad', '40000');
									$objWriter->writeAttribute('dist', '20000');
									$objWriter->writeAttribute('dir', '5400000');
									$objWriter->writeAttribute('rotWithShape', '0');

										// a:srgbClr
										$objWriter->startElement('a:srgbClr');
										$objWriter->writeAttribute('val', '000000');

											// a:alpha
											$objWriter->startElement('a:alpha');
											$objWriter->writeAttribute('val', '38000');
											$objWriter->endElement();

										$objWriter->endElement();

									$objWriter->endElement();

								$objWriter->endElement();

							$objWriter->endElement();

							// a:effectStyle
							$objWriter->startElement('a:effectStyle');

								// a:effectLst
								$objWriter->startElement('a:effectLst');

									// a:outerShdw
									$objWriter->startElement('a:outerShdw');
									$objWriter->writeAttribute('blurRad', '40000');
									$objWriter->writeAttribute('dist', '23000');
									$objWriter->writeAttribute('dir', '5400000');
									$objWriter->writeAttribute('rotWithShape', '0');

										// a:srgbClr
										$objWriter->startElement('a:srgbClr');
										$objWriter->writeAttribute('val', '000000');

											// a:alpha
											$objWriter->startElement('a:alpha');
											$objWriter->writeAttribute('val', '35000');
											$objWriter->endElement();

										$objWriter->endElement();

									$objWriter->endElement();

								$objWriter->endElement();

							$objWriter->endElement();

							// a:effectStyle
							$objWriter->startElement('a:effectStyle');

								// a:effectLst
								$objWriter->startElement('a:effectLst');

									// a:outerShdw
									$objWriter->startElement('a:outerShdw');
									$objWriter->writeAttribute('blurRad', '40000');
									$objWriter->writeAttribute('dist', '23000');
									$objWriter->writeAttribute('dir', '5400000');
									$objWriter->writeAttribute('rotWithShape', '0');

										// a:srgbClr
										$objWriter->startElement('a:srgbClr');
										$objWriter->writeAttribute('val', '000000');

											// a:alpha
											$objWriter->startElement('a:alpha');
											$objWriter->writeAttribute('val', '35000');
											$objWriter->endElement();

										$objWriter->endElement();

									$objWriter->endElement();

								$objWriter->endElement();

								// a:scene3d
								$objWriter->startElement('a:scene3d');

									// a:camera
									$objWriter->startElement('a:camera');
									$objWriter->writeAttribute('prst', 'orthographicFront');

										// a:rot
										$objWriter->startElement('a:rot');
										$objWriter->writeAttribute('lat', '0');
										$objWriter->writeAttribute('lon', '0');
										$objWriter->writeAttribute('rev', '0');
										$objWriter->endElement();

									$objWriter->endElement();

									// a:lightRig
									$objWriter->startElement('a:lightRig');
									$objWriter->writeAttribute('rig', 'threePt');
									$objWriter->writeAttribute('dir', 't');

										// a:rot
										$objWriter->startElement('a:rot');
										$objWriter->writeAttribute('lat', '0');
										$objWriter->writeAttribute('lon', '0');
										$objWriter->writeAttribute('rev', '1200000');
										$objWriter->endElement();

									$objWriter->endElement();

								$objWriter->endElement();

								// a:sp3d
								$objWriter->startElement('a:sp3d');

									// a:bevelT
									$objWriter->startElement('a:bevelT');
									$objWriter->writeAttribute('w', '63500');
									$objWriter->writeAttribute('h', '25400');
									$objWriter->endElement();

								$objWriter->endElement();

							$objWriter->endElement();

						$objWriter->endElement();

						// a:bgFillStyleLst
						$objWriter->startElement('a:bgFillStyleLst');

							// a:solidFill
							$objWriter->startElement('a:solidFill');

								// a:schemeClr
								$objWriter->startElement('a:schemeClr');
								$objWriter->writeAttribute('val', 'phClr');
								$objWriter->endElement();

							$objWriter->endElement();

							// a:gradFill
							$objWriter->startElement('a:gradFill');
							$objWriter->writeAttribute('rotWithShape', '1');

								// a:gsLst
								$objWriter->startElement('a:gsLst');

									// a:gs
									$objWriter->startElement('a:gs');
									$objWriter->writeAttribute('pos', '0');

										// a:schemeClr
										$objWriter->startElement('a:schemeClr');
										$objWriter->writeAttribute('val', 'phClr');

											// a:tint
											$objWriter->startElement('a:tint');
											$objWriter->writeAttribute('val', '40000');
											$objWriter->endElement();

											// a:satMod
											$objWriter->startElement('a:satMod');
											$objWriter->writeAttribute('val', '350000');
											$objWriter->endElement();

										$objWriter->endElement();

									$objWriter->endElement();

									// a:gs
									$objWriter->startElement('a:gs');
									$objWriter->writeAttribute('pos', '40000');

										// a:schemeClr
										$objWriter->startElement('a:schemeClr');
										$objWriter->writeAttribute('val', 'phClr');

											// a:tint
											$objWriter->startElement('a:tint');
											$objWriter->writeAttribute('val', '45000');
											$objWriter->endElement();

											// a:shade
											$objWriter->startElement('a:shade');
											$objWriter->writeAttribute('val', '99000');
											$objWriter->endElement();

											// a:satMod
											$objWriter->startElement('a:satMod');
											$objWriter->writeAttribute('val', '350000');
											$objWriter->endElement();

										$objWriter->endElement();

									$objWriter->endElement();

									// a:gs
									$objWriter->startElement('a:gs');
									$objWriter->writeAttribute('pos', '100000');

										// a:schemeClr
										$objWriter->startElement('a:schemeClr');
										$objWriter->writeAttribute('val', 'phClr');

											// a:shade
											$objWriter->startElement('a:shade');
											$objWriter->writeAttribute('val', '20000');
											$objWriter->endElement();

											// a:satMod
											$objWriter->startElement('a:satMod');
											$objWriter->writeAttribute('val', '255000');
											$objWriter->endElement();

										$objWriter->endElement();

									$objWriter->endElement();

								$objWriter->endElement();

								// a:path
								$objWriter->startElement('a:path');
								$objWriter->writeAttribute('path', 'circle');

									// a:fillToRect
									$objWriter->startElement('a:fillToRect');
									$objWriter->writeAttribute('l', '50000');
									$objWriter->writeAttribute('t', '-80000');
									$objWriter->writeAttribute('r', '50000');
									$objWriter->writeAttribute('b', '180000');
									$objWriter->endElement();

								$objWriter->endElement();

							$objWriter->endElement();

							// a:gradFill
							$objWriter->startElement('a:gradFill');
							$objWriter->writeAttribute('rotWithShape', '1');

								// a:gsLst
								$objWriter->startElement('a:gsLst');

									// a:gs
									$objWriter->startElement('a:gs');
									$objWriter->writeAttribute('pos', '0');

										// a:schemeClr
										$objWriter->startElement('a:schemeClr');
										$objWriter->writeAttribute('val', 'phClr');

											// a:tint
											$objWriter->startElement('a:tint');
											$objWriter->writeAttribute('val', '80000');
											$objWriter->endElement();

											// a:satMod
											$objWriter->startElement('a:satMod');
											$objWriter->writeAttribute('val', '300000');
											$objWriter->endElement();

										$objWriter->endElement();

									$objWriter->endElement();

									// a:gs
									$objWriter->startElement('a:gs');
									$objWriter->writeAttribute('pos', '100000');

										// a:schemeClr
										$objWriter->startElement('a:schemeClr');
										$objWriter->writeAttribute('val', 'phClr');

											// a:shade
											$objWriter->startElement('a:shade');
											$objWriter->writeAttribute('val', '30000');
											$objWriter->endElement();

											// a:satMod
											$objWriter->startElement('a:satMod');
											$objWriter->writeAttribute('val', '200000');
											$objWriter->endElement();

										$objWriter->endElement();

									$objWriter->endElement();

								$objWriter->endElement();

								// a:path
								$objWriter->startElement('a:path');
								$objWriter->writeAttribute('path', 'circle');

									// a:fillToRect
									$objWriter->startElement('a:fillToRect');
									$objWriter->writeAttribute('l', '50000');
									$objWriter->writeAttribute('t', '50000');
									$objWriter->writeAttribute('r', '50000');
									$objWriter->writeAttribute('b', '50000');
									$objWriter->endElement();

								$objWriter->endElement();

							$objWriter->endElement();

						$objWriter->endElement();

					$objWriter->endElement();

				$objWriter->endElement();

				// a:objectDefaults
				$objWriter->writeElement('a:objectDefaults', null);

				// a:extraClrSchemeLst
				$objWriter->writeElement('a:extraClrSchemeLst', null);

			$objWriter->endElement();

			// Return
			return $objWriter->getData();
	}

	/**
	 * Write fonts to XML format
	 *
	 * @param 	PHPExcel_Shared_XMLWriter	$objWriter
	 * @param 	string						$latinFont
	 * @param 	array of string				$fontSet
	 * @return 	string 						XML Output
	 * @throws 	Exception
	 */
	private function _writeFonts($objWriter, $latinFont, $fontSet)
	{
		// a:latin
		$objWriter->startElement('a:latin');
		$objWriter->writeAttribute('typeface', $latinFont);
		$objWriter->endElement();

		// a:ea
		$objWriter->startElement('a:ea');
		$objWriter->writeAttribute('typeface', '');
		$objWriter->endElement();

		// a:cs
		$objWriter->startElement('a:cs');
		$objWriter->writeAttribute('typeface', '');
		$objWriter->endElement();

		foreach($fontSet as $fontScript => $typeface) {
			$objWriter->startElement('a:font');
				$objWriter->writeAttribute('script', $fontScript);
				$objWriter->writeAttribute('typeface', $typeface);
			$objWriter->endElement();
		}

	}

	/**
	 * Write colour scheme to XML format
	 *
	 * @param 	PHPExcel_Shared_XMLWriter	$objWriter
	 * @return 	string 						XML Output
	 * @throws 	Exception
	 */
	private function _writeColourScheme($objWriter)
	{
		foreach(self::$_colourScheme as $colourName => $colourValue) {
			$objWriter->startElement('a:'.$colourName);

				$objWriter->startElement('a:srgbClr');
					$objWriter->writeAttribute('val', $colourValue);
				$objWriter->endElement();

			$objWriter->endElement();
		}
						
	}
}