<?php
	/* Libchart - PHP chart library
	 * Copyright (C) 2005-2008 Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
	 * 
	 * This program is free software: you can redistribute it and/or modify
	 * it under the terms of the GNU General Public License as published by
	 * the Free Software Foundation, either version 3 of the License, or
	 * (at your option) any later version.
	 * 
	 * This program 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 General Public License for more details.
	 *
	 * You should have received a copy of the GNU General Public License
	 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
	 * 
	 */
	
	/**
	 * Text drawing helper
	 *
	 * @author Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
	 */
	class Text {
		public $HORIZONTAL_LEFT_ALIGN = 1;
		public $HORIZONTAL_CENTER_ALIGN = 2;
		public $HORIZONTAL_RIGHT_ALIGN = 4;
		public $VERTICAL_TOP_ALIGN = 8;
		public $VERTICAL_CENTER_ALIGN = 16;
		public $VERTICAL_BOTTOM_ALIGN = 32;

		/**
		 * Creates a new text drawing helper.
		 */
		public function __construct() {
			$baseDir = dirname(__FILE__) . "/../../../";
		
			// Free low-res fonts based on Bitstream Vera <http://dejavu.sourceforge.net/wiki/>
			$this->fontCondensed = $baseDir . "fonts/DejaVuSansCondensed.ttf";
			$this->fontCondensedBold = $baseDir . "fonts/DejaVuSansCondensed-Bold.ttf";
		}

		/**
		 * Print text.
		 *
		 * @param Image GD image
		 * @param integer text coordinate (x)
		 * @param integer text coordinate (y)
		 * @param Color text color
		 * @param string text value
		 * @param string font file name
		 * @param bitfield text alignment
		 */
		public function printText($img, $px, $py, $color, $text, $fontFileName, $align = 0) {
			if (!($align & $this->HORIZONTAL_CENTER_ALIGN) && !($align & $this->HORIZONTAL_RIGHT_ALIGN)) {
				$align |= $this->HORIZONTAL_LEFT_ALIGN;
			}

			if (!($align & $this->VERTICAL_CENTER_ALIGN) && !($align & $this->VERTICAL_BOTTOM_ALIGN)) {
				$align |= $this->VERTICAL_TOP_ALIGN;
			}

			$fontSize = 8;
			$lineSpacing = 1;

 			list ($llx, $lly, $lrx, $lry, $urx, $ury, $ulx, $uly) = imageftbbox($fontSize, 0, $fontFileName, $text, array("linespacing" => $lineSpacing));

			$textWidth = $lrx - $llx;
			$textHeight = $lry - $ury;

			$angle = 0;

			if ($align & $this->HORIZONTAL_CENTER_ALIGN) {
				$px -= $textWidth / 2;
			}

			if ($align & $this->HORIZONTAL_RIGHT_ALIGN) {
				$px -= $textWidth;
			}

			if ($align & $this->VERTICAL_CENTER_ALIGN) {
				$py += $textHeight / 2;
			}

			if ($align & $this->VERTICAL_TOP_ALIGN) {
				$py += $textHeight;
			}

			imagettftext($img, $fontSize, $angle, $px, $py, $color->getColor($img), $fontFileName, $text);
		}
		
		/**
		 * Print text centered horizontally on the image.
		 *
		 * @param Image GD image
		 * @param integer text coordinate (y)
		 * @param Color text color
		 * @param string text value
		 * @param string font file name
		 */
		public function printCentered($img, $py, $color, $text, $fontFileName) {
			$this->printText($img, imagesx($img) / 2, $py, $color, $text, $fontFileName, $this->HORIZONTAL_CENTER_ALIGN | $this->VERTICAL_CENTER_ALIGN);
		}

		/**
		 * Print text in diagonal.
		 *
		 * @param Image GD image
		 * @param integer text coordinate (x)
		 * @param integer text coordinate (y)
		 * @param Color text color
		 * @param string text value
		 */
		public function printDiagonal($img, $px, $py, $color, $text) {
			$fontSize = 8;
			$fontFileName = $this->fontCondensed;

			$lineSpacing = 1;

 			list ($lx, $ly, $rx, $ry) = imageftbbox($fontSize, 0, $fontFileName, $text, array("linespacing" => $lineSpacing));
			$textWidth = $rx - $lx;

			$angle = -45;

			imagettftext($img, $fontSize, $angle, $px, $py, $color->getColor($img), $fontFileName, $text);
		}
	}
?>