PHP图片处理类（图片文字水印、大小压缩、缩放）

1、

  此类有两个问题还没解决，有解决的朋友可以告诉我下。文字水印定位问题和文字水印中文乱码问题。

imagefontwidth这个方法获取的宽度测试有问题，高度也是。imagettftext这个方法不论怎么调试字符转码，都还存在乱码问题。

 

2、测试类：

rotate(280, array('R'=>123, 'G'=>45, 'B'=>225));
//$r_re = $image->thumb(4, 0, 0, 0, 0, 30);
//$r_re = $image->water(0,$water,'',9);
$r_re = $image->water(1, '' , 'wwww.aiqitu.com', 7, 80,$font,60);

var_dump($r_re);

 

2、image处理图片主类

 'gif', 2 => 'jpg', 3 => 'png', 6 => 'bmp' );											// 图像types 对应表
	private $suffix_method = array('gif'=>'gif', 'jpg'=>'jpeg', 'jpeg'=>'jpeg', 'png'=>'png', 'bmp'=>'wbmp');			// 图像type对应处理方法后缀

	public function image($filename, $destname, $suffix = ''){
		$this->suffix = $suffix;
		$this->filename = $filename;
		$this->destname = $destname;
		$this->imagemethod = 'image'.$this->suffix_method[$this->suffix];
		$this->imagecreatefrommethod = 'imagecreatefrom'.$this->suffix_method[$this->suffix];
	}
	
	
	/**
	 * 图片缩放裁剪
	 * @param $type		类型：0=等比裁剪   1=缩放后居中裁剪   2=缩放后上左裁剪   3=直接坐标裁剪
	 * @param $w		宽度
	 * @param $h		高度
	 * @param $x		x轴坐标
	 * @param $y		y轴坐标
	 * @param $quality	图片压缩质量默认75（0-100之间）
	 */
	public function thumb($type = 0, $w =180, $h = 120, $x = 0, $y = 0, $quality =75){
		$imageinfo = $this->getImageInfo($this->filename);
		$file_ext = $imageinfo['ext'];
		$file_type = $imageinfo['type'];
		$file_width = $imageinfo[0];
		$file_height = $imageinfo[1];
		$file_size = $imageinfo['size'];
		if($file_width < $w && $file_height < $h ){
			return copy($this->filename, $this->destname);
		}
		$thumb_params = $this->getThumTypesParams($type, $file_width, $file_height, $w, $h, $x, $y);
		
		$createfromfun = $this->imagecreatefrommethod;
		$old_im = $createfromfun($this->filename);
		
		//创建缩略图片或裁剪图片
		if($file_type != 'gif' && function_exists('imagecreatetruecolor')){
			$thumb_img = imagecreatetruecolor($thumb_params['thumb_w'], $thumb_params['thumb_h']);
		}else{
			$thumb_img = imagecreate($thumb_params['thumb_w'], $thumb_params['thumb_h']);
		}
//		var_dump($thumb_params);
		//复制图片 原图片的一步复制到创建的缩略或裁剪图里面
		if($type == 3){
			imagecopy($thumb_img, $old_im, 0, 0, $thumb_params['start_x'], $thumb_params['start_y'], $thumb_params['src_w'], $thumb_params['src_h']);
		}else if(function_exists('ImageCopyResampled')){
			imagecopyresampled($thumb_img,$old_im, 0, 0, $thumb_params['start_x'], $thumb_params['start_y'], $thumb_params['thumb_w'], $thumb_params['thumb_h'], $thumb_params['src_w'], $thumb_params['src_h']);
		}else{
			ImageCopyResized($thumb_img,$old_im, 0, 0, $thumb_params['start_x'], $thumb_params['start_y'], $thumb_params['thumb_w'], $thumb_params['thumb_h'], $thumb_params['src_w'], $thumb_params['src_h']);
		}
		
		//jpeg设置隔行扫描
		$file_type == 'jpeg' && imageinterlace ( $thumb_img, 1 );
		$imagefun = $this->imagemethod;
		if($this->suffix == 'jpg' || $this->suffix = 'jpeg' || $this->suffix = 'png'){
			$thumb_result = @$imagefun ( $thumb_img, $this->destname , $quality);
		}else{
			$thumb_result = @$imagefun ( $thumb_img, $this->destname );
		}
		imagedestroy ( $thumb_img );
		imagedestroy ( $old_im );
		return $thumb_result;
	}
	private function getThumTypesParams($type, $old_w, $old_h, $new_w, $new_h, $start_x = 0, $start_y = 0){
		$params = array();
		switch ($type) {
			case 0: // 等比缩放
				$scale = min ( $new_w / $old_w, $new_h / $old_h ); // 计算缩放比例
				$params['thumb_w'] = ( int ) ($old_w * $scale); // 缩略图尺寸
				$params['thumb_h'] = ( int ) ($old_h * $scale);
				$params['start_x'] = $params['start_y'] = 0;
				$params['src_w'] = $old_w;
				$params['src_h'] = $old_h;
				break;
			case 1: // 缩放后居中裁剪
				$scale1 = round ( $new_w / $new_h, 2 );
				$scale2 = round ( $old_w / $old_h, 2 );
				if ($scale1 > $scale2) {
					$params['src_h'] = round ( $old_w / $scale1, 2 );
					$params['start_y'] = ($old_h - $params['src_h']) / 2;
					$params['start_x'] = 0;
					$params['src_w'] = $old_w;
				} else {
					$params['src_w'] = round ( $old_h * $scale1, 2 );
					$params['start_x'] = ($old_w - $params['src_w']) / 2;
					$params['start_y'] = 0;
					$params['src_h'] = $old_h;
				}
				$params['thumb_w'] = $new_w; // 缩略图尺寸
				$params['thumb_h'] = $new_h;
				break;
			case 2: //缩放后上左裁剪
				$scale1 = round ( $new_w / $new_h, 2 );
				$scale2 = round ( $old_w / $old_h, 2 );
				if ($scale1 > $scale2) {
					$params['src_h'] = round ( $old_w / $scale1, 2 );
					$params['src_w'] = $old_w;
				} else {
					$params['src_w'] = round ( $old_h * $scale2, 2 );
					$params['src_h'] = $old_h;
				}
				$params['start_x'] = 0;
				$params['start_y'] = 0;
				$params['thumb_w'] = $new_w; // 缩略图尺寸
				$params['thumb_h'] = $new_h;
				break;
			case 3: //坐标直接裁剪（无缩放）
				$params['start_x'] = $start_x;
				$params['start_y'] = $start_y;
				$params['thumb_w'] = $new_w; // 缩略图尺寸
				$params['thumb_h'] = $new_h;
				$params['src_w'] = $old_w;
				$params['src_h'] = $old_h;
				break;
			case 4: //直接压缩图片大小（目前只支持jpg、png）
				$params['start_x'] = 0;
				$params['start_y'] = 0;
				$params['thumb_w'] = $old_w; // 缩略图尺寸
				$params['thumb_h'] = $old_h;
				$params['src_w'] = $old_w;
				$params['src_h'] = $old_h;
				break;
			
			default:
				;
				break;
		}
		return $params;
	}
	
	/**
	 * 图片水印（图片和文字）
	 * @param $type		类型：0=图片水印  1=文字水印
	 * @param $water	水印图片路径
	 * @param $words	水印文字
	 * @param $pos		水印位置
	 * @param $opty		水印透明度
	 */
	public function water($type = 0, $water = '',$words = '', $pos = 0, $opty = 80, $font = '', $fontsize = 13, $words_color = array('R'=>0, 'G'=>0, 'B'=>0)){
		//图片信息
		$imageinfo = $this->getImageInfo($this->filename);
		$file_width = $imageinfo[0];
		$file_height = $imageinfo[1];
		$createfromfun = $this->imagecreatefrommethod;
		$image_res = $createfromfun($this->filename);
		
		if($type == 0){
			//水印图片信息
			$waterinfo = $this->getImageInfo($water);
			$water_width = $waterinfo[0];
			$water_height = $waterinfo[1];
			$water_type = $waterinfo['type'];
			$watercreatefun = 'imagecreatefrom'.$water_type;
			$water_res = $watercreatefun($water);
			
			// 剪切水印
			$water_width > $file_width && $water_width = $file_width;
			$water_height > $file_height && $water_height = $file_height;
			$pos_scale = $this->getwaterposscale($pos, $file_width, $file_height,$water_width, $water_height);
			
			// 设定图像的混色模式
			imagealphablending ( $image_res, true );
			// 添加水印
			imagecopymerge ( $image_res, $water_res, $pos_scale['x'], $pos_scale['y'], 0, 0, $water_width, $water_height, $opty);
			$imagefun = $this->imagemethod;
			$water_result = $imagefun($image_res, $this->destname);
			imagedestroy ( $image_res );
			imagedestroy ( $water_res );
			return $water_result;
		}else{
			//水印文字
			$water_words = mb_convert_encoding($words, "html-entities", "utf-8");
			$font_h = imagefontheight($fontsize);
			$font_w = imagefontwidth($fontsize);
			$pos_scale = $this->getwaterposscale($pos,$file_width, $file_height, 175, 20);
			$posX = $pos_scale['x'];
			$posY = $pos_scale['y'];
			$color=imagecolorallocate($image_res,0,0,0);
			imagettftext($image_res,$fontsize, 0, $posX,$posY,$color,$font,$water_words);
			$words_res = imagecreatetruecolor($file_width, $file_height);
			imagecopy($words_res,$image_res,0,0,0,0,$file_width,$file_height);
			$imagefun = $this->imagemethod;
			$water_result = $imagefun($image_res, $this->destname);
			imagedestroy ( $image_res );
			imagedestroy ( $words_res );
			return $water_result;			
		}
	}
	private function getwaterposscale($pos, $old_w, $old_h, $water_w, $water_h){
		$pos_scale = array();
		switch ($pos) {
			case 0 : //随机
				$posX = rand ( 0, ($old_w - $water_w) );
				$posY = rand ( 0, ($old_h - $water_h) );
				break;
			case 1 : //1为顶端居左
				$posX = 0;
				$posY = 0+$water_h;
				break;
			case 2 : //2为顶端居中
				$posX = ($old_w - $water_w) / 2;
				$posY = 0;
				break;
			case 3 : //3为顶端居右
				$posX = $old_w - $water_w;
				$posY = 0;
				break;
			case 4 : //4为中部居左
				$posX = 0;
				$posY = ($old_h - $water_h) / 2;
				break;
			case 5 : //5为中部居中
				$posX = ($old_w - $water_w) / 2;
				$posY = ($old_h - $water_h) / 2;
				break;
			case 6 : //6为中部居右
				$posX = $old_w - $water_w;
				$posY = ($old_h - $water_h) / 2;
				break;
			case 7 : //7为底端居左
				$posX = 0;
				$posY = $old_h - $water_h;
				break;
			case 8 : //8为底端居中
				$posX = ($old_w - $water_w) / 2;
				$posY = $old_h - $water_h;
				break;
			case 9 : //9为底端居右
				$posX = $old_w - $water_w;
				$posY = $old_h - $water_h;
				break;
			default : //随机
				$posX = rand ( 0, ($old_w - $water_w) );
				$posY = rand ( 0, ($old_h - $water_h) );
				break;
		}
		$pos_scale['x'] = $posX;
		$pos_scale['y'] = $posY;
		return $pos_scale;
	}
	
	/**
	 * 图片旋转
	 * @param $rotation   角度整数（90 180 270）
	 * @param $bg		       旋转过后空白处的颜色 ,默认白色。比如：array('R'=>255, 'G'=>255, 'B'=>255)，RGB整数值
	 */
	public function rotate($rotation ,$bg = array('R'=>255, 'G'=>255, 'B'=>255)){
		$localimagemethod = $this->imagemethod;
		$localimagefrommethod = $this->imagecreatefrommethod;
		$im = $localimagefrommethod($this->filename);
		$white=imagecolorallocate($im, $bg['R'], $bg['G'], $bg['B']);
		$rotated_res =imagerotate($im, $rotation,$white);
		return $localimagemethod($rotated_res, $this->destname);
	}
	
	/*********************************************base method*******************************/
	private function getImageInfo($filename) {
		$imageinfo = @getimagesize ( $filename );
		$imageinfo ['size'] = @filesize ( $filename);
		if (isset ( $this->types [$imageinfo [2]] )) {
			$imageinfo ['ext'] = $imageinfo ['type'] = $this->types [$imageinfo [2]];
		} else {
			$imageinfo ['ext'] = $imageinfo ['type'] = 'jpg';
		}
		$imageinfo ['type'] == 'jpg' && $imageinfo ['type'] = 'jpeg';
		$imageinfo ['size'] = @filesize ( $filename );
		return $imageinfo;
	}
}