<?php
/**
 * Library of tool functions to manipulate an image
 */
class ImgTools {
	public static $maxScreenWidth = 1067; //screen dimensions

	public static $maxScreenHeight = 600;

	public static $minFuzzFactor = 0.08; //minimal factor for $fuzz

	public static $maxFuzzFactor = 0.64; //maximal factor for $fuzz

	/**
	 * Returns $im with random transparent color
	 * @param Imagick $im
	 * @param int $maxRGB
	 * @return Imagick $im
	 */
	public static function transparantRandom(Imagick $img, $maxRGB) {
		//compute random fuzzyness
		$minFuzz = intval(self::$minFuzzFactor * $maxRGB);
		$maxFuzz = intval(self::$maxFuzzFactor * $maxRGB);
		$randFuzz = mt_rand ($minFuzz,$maxFuzz);

		//take average RGB value of random pixel
		$xPoint = mt_rand(0,$img->getImageWidth());
		$yPoint = mt_rand(0,$img->getImageHeight());
		$randomPixel = $img->getImagePixelColor($xPoint, $yPoint);
		$randomPixelColor = $randomPixel->getColorAsString();

		//make transparency
		$img->transparentPaintImage($randomPixelColor, 0.0, $randFuzz, false);
		return $img;
	}

	/**
	 * random Rotate image
	 * @param Imagick $im
	 * @return Imagick $im
	 */
	public static function randomRotate(Imagick $img) {
		$transp = new ImagickPixel('#ffffff');
		$ar = array(0,90,180,270);
		$img->rotateImage($transp, $ar[mt_rand(0,3)]);
		return $img;
	}

	/**
	 * Resize image
	 * @param Imagick $im
	 * @param integer $retWidth
	 * @param integer $retHeight
	 * @return Imagick $im
	 */
	public static function resize(Imagick $img, $retWidth, $retHeight) {
		$img->resizeImage((int)$retWidth, (int)$retHeight, imagick::FILTER_POINT, 0);
		return $img;
	}

	/**
	 * Recolor image
	 * @param Imagick $im
	 * @return Imagick $im
	 */
	public static function recolor(Imagick $img){
		$recolorValue = mt_rand(4, 250);
		$times = mt_rand(1, 4);
		for($i = 0; $i <= $times; $i++) {
			$img->cycleColormapImage($recolorValue);
		}
		return $img;
	}

	/**
	 * returns MagickWand with randomly zoomed part of image $im with size $retWidth * $retHeight
	 * @param Imagick $im
	 * @param integer $retWidth
	 * @param integer $retHeight
	 * @param boolean $rotate
	 */
	public static function zoomCrop(Imagick $img, $retWidth, $retHeight, $rotate = false) {
		if ($rotate == true) {
			$img = self::randomRotate($img);
		}

		$fact = mt_rand(10, 40) / 100; //zoomfactor 10 - 40%
 		$width = $img->getImageWidth();
 		$height = $img->getImageHeight();
		$newWidth = (int)($width * $fact);
		$newHeight = (int)($height * $fact);
		//crop $im
		//x and y offset random 0 - width (or height) of blown up image minus crop area (of course!)
		$img->cropImage($newWidth, $newHeight,
						mt_rand(0, (int)($width - $newWidth)),
						mt_rand(0, (int)($height - $newHeight)));

		$img->resizeImage((int)$retWidth, (int)$retHeight, imagick::FILTER_POINT, 0);
		return $img;
	}

	/**
	 * converts all gif images in array to png images
	 * returns Array with converted filenames
	 * @param array $imgAr
	 * @return array $newArray
	 */
	public static function convertGifsToPng($imgAr) {
		$newArray = array();
		while ($filename = array_shift($imgAr)) {
			$imgInfo = getimagesize($filename);
			$mimeType = $imgInfo['mime'];
			//find gif
			if ($mimeType == "image/gif") {
				// Replace .gif extension with .png
				$newFilename = preg_replace('/\.gif$/i', '.png', $filename);
				//convert
				$img = new Imagick($filename);

				if($img->writeImage($newFilename)) {
					//Remove original and rename new to save space
					unlink($filename);
					array_push($newArray, $newFilename);
				}
			} else {
				array_push($newArray, $filename);
			}

		}
		return $newArray;
	}

	/**
	 * LEGACY?
	 * INT (0 - 1000) -> promilage of average RGB value of center pixel of $im related to $maxRGB
	 * @param Imagick $im
	 * @param int $maxRGB
	 * @return int
	 */
	public static function imgCenterValueProm(Imagick $img, $maxRGB) {
		$centerX = $img->getImageWidth() / 2;
		$centerY = $img->getImageHeight() / 2;

		//take average of the RGB of most middle pixel of each image and put it into an array
		$centerPixel = $img->getImagePixelColor($centerX,$centerY);
		$colors = $centerPixel->getColor();

		$averageColor = round( ($colors['r'] + $colors['g'] + $colors['b']) / 3);

		return round(($averageColor / $maxRGB) * 1000);
	}

	/**
	 * LEGACY?
	 * returns magickWand scaled proportionaly to $maxW or $maxH
	 * @param Imagick $im
	 * @param integer $maxW
	 * @param integer $maxH
	 * @return Imagick $im
	 */
	public static function scaleByLength(Imagick $img, $maxW, $maxH) {
    	$width = $img->getImageWidth();
		$height = $img->getImageHeight();
		if(($width <= self::$maxScreenWidth) && ($height <= self::$maxScreenHeight)) {
			return $img;
		} else {
	         if ($width >= $height) { //horizontal image
	            $new_x = $maxW;
	            $new_y = round(($new_x / $width) * $height, 0);
	        } else { //vertical image
	            $new_y = $maxH;
	            $new_x = round(($new_y / $height) * $width, 0);
	        }
	        return self::resize($img, $new_x, $new_y);
       }
    }
}
?>