======[PHP] Font Image Creator Class======

<nowiki>FontImageCreator</nowiki> ist eine Klasse, mit der Textgrafiken direkt erstellt werden können

=====Mögliche Anwendung=====
  * [[FontClassSingleEntry]]
  * [[TextBoxClass]]
  * [[FontClassSignatur]]

{{image class="left" url="images/icons/48/application-x-php.png"}} 
=====Die Klasse FontImageCreator=====
---Die Klasse Font wandelt Strings in Grafiken mit ttf-Schriften um

<code>(php;1;FontImageCreator.php)
<?php
/**
* @copyright	mpl by ERB software
*       		All rights reserved
* @contact		stefan.erb@erb-software.com
* @date         10.02.2010
*/
class FontImageCreator{
	/** Standardwerte */
	const DEFAULT_SIZE = 50;
	const DEFAULT_BORDER = 10;
	const DEFAULT_BACKGROUND_COLOR = '#C0C0C0';
	const DEFAULT_TEXT_COLOR = '#000000';
	const DEFAULT_TRANSPARENT = 1;
	const DEFAULT_ANGLE = 0;
	const DEFAULT_FONT_PATH = '/ttf';
	
	/** Content Type */
	const PNG_CREATOR = 'imagepng';
	const JPEG_CREATOR = 'imagejpeg';
	const GIF_CREATOR = 'imagegif';
	
	const TRANSPARENT_TRUE = 1;
	const TRANSPARENT_FALSE = 0; 

	const HEX_COLOR_PATTERN = '/^#([[:xdigit:]]{2})([[:xdigit:]]{2})([[:xdigit:]]{2})$/';
	const FONT_NAME_PATTERN = '/^[[:alnum:]_\-\.]+\.ttf$/i';
	
	
	/**
	* constructer
	* @param String text
	* @param String FontName
	*/
	public function __construct($text=NULL, $font=NULL, $fontPath=self::DEFAULT_FONT_PATH){
		try{
			$this->text = $text;
			$this->font = $font;
			$this->fontPath = $fontPath;
			$this->size = self::DEFAULT_SIZE;
			$this->border = self::DEFAULT_BORDER;
			$this->backgroundColor = self::DEFAULT_BACKGROUND_COLOR;
			$this->textColor = self::DEFAULT_TEXT_COLOR;
			$this->transparent = self::DEFAULT_TRANSPARENT;
			$this->angle = self::DEFAULT_ANGLE;
		} catch (Exception $e){
			throw $e;    
		}
	}

	/**
	* createPng
	* Erstellt eine PNG-Grafik
	*/
	public function createPng($image=NULL){
		$this->createImage(IMAGETYPE_PNG, self::PNG_CREATOR, $image);
	}

	/**
	* createPng
	* Erstellt eine Jpeg-Grafik
	*/
	public function createJpeg($image=NULL){
		$this->createImage(IMAGETYPE_JPEG, self::JPEG_CREATOR, $image);
	}
	
	/**
	* createGif
	* Erstellt eine Jpeg-Grafik
	*/
	public function createGif($image=NULL){
		$this->createImage(IMAGETYPE_GIF, self::GIF_CREATOR, $image);
	}

	/**
	* @param    image_type_to_mime_type  image type
	* @param    String  image creator function
	*/
	private function createImage($imageType, $imageCreatorFunction, $image=NULL){
		try{
			if (!$image) $this->getImage($image);
			/** Header ausgeben */
			header ('Content-type: '.image_type_to_mime_type($imageType));
			/** Grafik ausgeben */
			$imageCreatorFunction($image);
			/** temporäre Grafik zerstören */
			imagedestroy($image);
		} catch (Exception $e){
			throw $e;    
		}
	}

	/**
	 * gibt ein Image zurück
	 * @param  $image
	 * @return $box => array(xSize, ySize)
	 */
	public function getImage(&$image){
		/** Grafik erstellen */
		try{
			$box = $this->getTextBoxSize();
			if (!$image) $image = imagecreate ($box['xSize'] , $box['ySize']);
			/** Grundfarben definieren (rgb))*/
			$backgroundColor = self::imageColor($image, $this->backgroundColor);
			/** Textfarbe: */
			$textColor = self::imageColor($image, $this->textColor);
			/** Hintergrund mit Hintergrundfarbe füllen */
			imagefill($image, 0, 0, $backgroundColor);
			/** Hintergrundfarbe ggf als transparent definieren */
			if($this->transparent) imagecolortransparent($image, $backgroundColor);
			/** Text einfügen */
			$xPos = abs($box[6]) + $this->border;
			$yPos = abs($box[7]) + $this->border;
			$textbox = ImageTTFText ($image, $this->size, $this->angle, $xPos, $yPos , $textColor, $this->absFontPath, $this->text);
		} catch (Exception $e){
			throw $e;    
		}
		return $box;
	}

	/**
	 * Textboxgrösse ermitteln
	 * @return Array(xSize, ySize)
	 */
	public function getTextBoxSize(){
		/** Schriftbildgrösse ermitteln */     
		$b = imagettfbbox($this->size, $this->angle, $this->absFontPath, $this->text);
		/** Grafik erstellen */
		$b['xSize']   = abs(max($b[2], $b[4]) - min($b[0], $b[6])) + (2*$this->border);
		$b['ySize']   = abs(min($b[5], $b[7]) - max($b[1], $b[3])) + (2*$this->border);
		return $b;
	}

	/**
	 * Farbe auf Grafik als transparent deklarieren
	 * @param $image
	 * @param $color
	 */
	public static function setTransparent(&$image, $color = self::DEFAULT_BACKGROUND_COLOR){
		imagecolortransparent($image, self::imageColor($image, $color));
	}
	
	/**
	* create a imageColor by a html #-Value (#FFFFFF, #00FFFF etc.)
	* @param    Image
	* @param    String color als Hexwert
	* @return   ImageColor
	*/
	public static function imageColor(&$image, $color){
		//hexwert parsen
		preg_match(self::HEX_COLOR_PATTERN, $color, $rgb);
		//Gefundener Gesammtstring entfernen 
		array_shift($rgb);
		//Hexwerte in Decimale Werte wandeln und array um eine Stufe reduzieren
		array_walk($rgb, create_function('&$item, $key', '$item = hexdec($item);'));
		
		return ImageColorAllocate($image, $rgb[0], $rgb[1], $rgb[2]);
	}
	
	/**
	* Magic Function __get for all properties
	* @access   public
	* @param    String name
	* @return   Variant value
	*/
	public function __get($name){
		switch ($name){
			case 'absFontPath':
				$absFontPath = dirname(__FILE__)."{$this->fontPath}/{$this->font}";
				if(!is_file($absFontPath)) {
					throw new Exception("Font not found :{$absFontPath}"); 
				}
				return $absFontPath;
			default:
				return $this->$name;                
		}
	}
	/**
	* Magic Function __set for all properties
	* @access   public
	* @param    String name
	* @param    String value
	 */
	public function __set($name, $value){
		switch ($name){
			case 'font':
				if ($value && !preg_match(self::FONT_NAME_PATTERN, $value)){
					throw new Exception("invalid Fontname :{$value}");
				}
			case 'fontPath':
				if ($fontPath && !is_dir($value)){
					throw new Exception("invalid Directory :{$value}");
				}
			default:
				$this->$name = $value;
		}
	}

	public function __isset($name){$this->offsetExists($name);}
	public function __unset($name){$this->offsetUnset($name);}
	
}
?>
</code>

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