<?php
/*
	Write an image title.
	First word is bold, the rest is lite.
	Write white text to transparent PNG.
	By David Nash - http://davidnash.com.au
*/

class ImageTitle {

	public $text = 'Welcome to Example';
	public $font_size = 26;
	public $width = 450;
	public $height = 61;

	public $baseline_amt = 21;
	public $align = 'left';

	public $red = 255;
	public $green = 255;
	public $blue = 255;

	//public $write_to;
	//public $font_dir;

	function write() {

		//set the enviroment variable for GD, so we can get the font from this directory.
		putenv('GDFONTPATH=' . realpath($this->font_dir));

		//create the image
		$im = @imagecreatetruecolor($this->width, $this->height);

		//transparent background
		imagealphablending($im, false);
		imagesavealpha($im, true);
		$clear = imagecolorallocatealpha($im, 0, 0, 0, 127);
		imagefilledrectangle($im, 0, 0, $this->width-1, $this->height-1, $clear);

		//colour of text
		$text_color = imagecolorallocate($im, $this->red, $this->green, $this->blue);

		//lowercase
		$this->text = strtolower( $this->text );
		
		//the first word needs to be bold
		//first word is in $words[0], the rest is in $words[1]
		$words = explode(' ', $this->text, 2);
		
		//if there's only one word in the title, create an empty second word
		if( !isset( $words[1] ) )
			$words[1] = '';

		//add the space back to the start of the second word
		$words[1] = ' '.$words[1];

		//work out how wide the first word will be
		$font = 'Med';
		$b = imagettfbbox( $this->font_size, 0, $font, $words[0] );
		$firstWordWidth = $b[2] - $b[0];
		
		$baseline = $this->height - $this->baseline_amt;
		
		//write first word
		$start_x = 0;

		if( $this->align == 'center' ) {
			//we want to align center, get the width of the entire text, based on thin font
			$allTextBB = imagettfbbox( $this->font_size, 0, 'Lite', $this->text );
			$allTextWidth = $allTextBB[2] - $allTextBB[0];
			$start_x = ($this->width - $allTextWidth - 20 )/2;
		}

		imagettftext($im, $this->font_size, 0, $start_x, $baseline, $text_color, $font, $words[0]);

		//write second word
		$font = 'Lite';
		imagettftext($im, $this->font_size, 0, $start_x + $firstWordWidth, $baseline, $text_color, $font, $words[1]);
		
		//construct filename
		$filename =  $this->filename( $this->text );
		
		//output to file
		imagepng($im, $this->write_to.$filename);
		imagedestroy($im);
	}

	function filename( $text='' ) {
		if( empty($text) )
			$text = $this->text;
		
		$text = strtolower( $text );
		return ereg_replace( "[^A-Za-z0-9]", "", $text ).'.png';
	}

} //end class

?>