<?php
/* $Id$ */
namespace Mammut\Chart\Renderer;

(defined('MAMMUT') && (basename(__FILE__) != basename($_SERVER['PHP_SELF']))) or die('ACCESS DENIED');

use Mammut\Image\Color;
use Mammut\IO\iOutput;
use Mammut\IO\iInput;

/**
 * Pixel image renderer based on GDLib
 *
 * @author Stefan Daurer <s.daurer@q-spot.org>
 * @package Mammut\Chart
 */
class ImageRenderer extends \Mammut\StdObject implements iRenderer {
	
	private $imgType;
	private $img;

	/**
	 * Creates a new ImageRenderer object
	 * 
	 * @param string $imgType
	 *        	one of the IMG_* constants of the GDLib extension, default is IMG_PNG
	 */
	public function __construct($imgType = IMG_PNG) {
		$this->imgType = $imgType;
	}
	
	protected function selectColor(Color $c) {
		return imagecolorallocate($this->img, $c->getRed(), $c->getGreen(), $c->getBlue());
	}
	
	protected function freeColor($id) {
		imagecolordeallocate($this->img, $id);
	}

	public function start($w, $h, Color $bg, $hint) {
		$this->img = imagecreatetruecolor($w, $h);
		if (!is_null($bg)) {
			$c = $this->selectColor($bg);
			imagefilledrectangle($this->img, 0, 0, $w, $h, $c);
			$this->freeColor($c);
		}
		imageantialias($this->img, true);
	}
	
	public function drawLine($x1 , $y1 , $x2 , $y2, Color $color) {
		$c = $this->selectColor($color);
		imageline($this->img, $x1, $y1, $x2, $y2, $c);
		$this->freeColor($c);
		
	}

	public function drawRect($x1 , $y1 , $x2 , $y2, Color $color, $fill = FALSE) {
		$c = $this->selectColor($color);
		if ($fill)
			imagefilledrectangle($this->img, $x1 , $y1 , $x2 , $y2, $c);
		else
			imagerectangle($this->img, $x1 , $y1 , $x2 , $y2, $c);
		$this->freeColor($c);
	}

	public function drawText($x, $y, $text, Color $color, $font = NULL, $size = -1, $angle = 0) {
		$c = $this->selectColor($color);
		imagestring($this->img, 1, $x, $y, $text, $c);
		$this->freeColor($c);
	}
	
	public function drawEllipse($cx , $cy , $width , $height , Color $color, $fill = FALSE) {
		$c = $this->selectColor($color);
		if ($fill)
			imagefilledellipse($this->img, $cx, $cy, $width, $height, $c);
		else
			imageellipse($this->img, $cx, $cy, $width, $height, $c);
		$this->freeColor($c);
	}
	
	public function drawArc($cx , $cy , $width , $height, $start, $end , Color $color, $fill = FALSE) {
		$c = $this->selectColor($color);
		if ($fill)
			imagefilledarc($this->img, $cx, $cy, $width, $height , $start , $end , $c, IMG_ARC_PIE);
		else
			imagearc($this->img, $cx, $cy, $width, $height, $start , $end , $c, IMG_ARC_PIE);
		$this->freeColor($c);
	}

	public function output($file = NULL) {
		if(is_null($file))
			imagepng($this->img);
		else {
			if ($file instanceof iInput) {
				// TODO: find a better way to do this
				ob_start();
				imagepng($this->img);
				$file->write(ob_get_contents());
				ob_end_clean();
			}
			else
				imagepng($this->img, $file);
		}
	}

	public function __destruct() {
		imagedestroy($this->img);
		$this->img = NULL;
	}
}