自定义MVC框架之工具类-图像处理类

 ?1 <?php ?2 ??3 class Image{ ?4 ????//文件路径 ?5 ????protected $path; ?6 ????//是否允许随机文件名称 ?7 ????protected $enableRandName; ?8 ????//文件类型 ?9 ????protected $type; 10 ????//错误号 11 ????protected $errorNo; 12 ????//错误信息 13 ????protected $errorInfo; 14 ?15 ????public function __construct( $_path = ‘./‘, $_enableRandName = true ){ 16 ????????$this->path = $_path; 17 ????????$this->enableRandName = $_enableRandName; 18 ????} 19 ?20 ????public function __get( $key ) { 21 ????????if( $key == ‘errorNo‘ ) { 22 ????????????return $this->errorNo; 23 ????????}else if( $key == ‘errorInfo‘ ) { 24 ????????????return $this->getErrorInfo(); 25 ????????} 26 ????} ?27 ????protected function getErrorInfo(){ 28 ????????$info = ‘‘; 29 ????????switch( $this->errorNo ){ 30 ????????????case 1000: 31 ????????????????$info = "水印或者图片源文件不存在"; ????????????????32 ????????????????break; 33 ????????????case 1001: 34 ????????????????$info = ‘水印图片的尺寸(宽或者高)大于图片本身‘; 35 ????????????????break; 36 ????????} 37 ????????return $info; 38 ????} 39 ?40 ????//获取图片信息 41 ????public static function getImageInfo( $imgPath ){ 42 ????????$data = getimagesize( $imgPath ); 43 ????????$info[‘width‘] = $data[0]; 44 ????????$info[‘height‘] = $data[1]; 45 ????????$info[‘mime‘] = $data[‘mime‘]; 46 ????????return $info; 47 ????} 48 ?49 ????/* 50 ?????* ???@srcImg 原图片 51 ?????* ???@waterImg 水印图片 52 ?????* ???@pos 水印位置 53 ?????* ???@alpha 透明度 54 ?????* ???@prefix 水印处理之后的图片前缀 55 ?????* */ 56 ????public function waterMark( $srcImg, $waterImg, $pos, $alpha, $prefix = ‘ghostwu_‘ ){ 57 ????????//检查图片和水印是否存在 58 ????????if( !file_exists( $srcImg ) ?59 ????????????|| !file_exists( $waterImg ) ) { 60 ????????????$this->errorNo = 1000; 61 ????????????return false; 62 ????????} ?63 ?64 ????????//获取图片和水印信息 65 ????????$srcImageInfo = self::getImageInfo( $srcImg ); 66 ????????$waterImageInfo = self::getImageInfo( $waterImg ); 67 ?68 ????????$this->type = explode( ‘/‘, $srcImageInfo[‘mime‘] )[1]; 69 ?70 ????????//检查水印和图片的尺寸, 水印是否能加在图片上 71 ????????if( !$this->check( $srcImageInfo, $waterImageInfo ) ) { 72 ????????????$this->errorNo = 1001; 73 ????????????return false; 74 ????????} 75 ?76 ????????//打开图片文件和水印文件资源 77 ????????$imgRes = self::openImage( $srcImg ); 78 ????????$waterRes = self::openImage( $waterImg ); 79 ?80 ????????//计算水印图片位置 ????81 ????????$waterPos = $this->calcPosition( $pos, $srcImageInfo, $waterImageInfo ); 82 ?83 ????????//合成水印图片 84 ????????imagecopymerge ( $imgRes, $waterRes, $waterPos[‘x‘], $waterPos[‘y‘], 0, 0, $waterImageInfo[‘width‘], $waterImageInfo[‘height‘], $alpha ); 85 ?86 ????????//得到文件的保存名字 87 ????????$saveName = $this->getFileName( $srcImg, $prefix ); 88 ?89 ????????//拼凑完整的文件名称 90 ????????$fullPath = rtrim( $this->path, ‘/‘ ) . ‘/‘ . $saveName; 91 ?????????92 ????????//保存添加水印后的文件 93 ????????$this->saveImage( $imgRes, $fullPath ); 94 ?95 ????????imagedestroy( $imgRes ); 96 ????????imagedestroy( $waterRes ); 97 ?98 ????????return $fullPath; 99 ????}100 101 ????protected function saveImage( $imgRes, $fullPath ){102 ????????$func = ‘image‘ . $this->type;103 ????????$func( $imgRes, $fullPath );104 ????}105 106 ????protected function getFileName( $imgPath, $prefix ){107 ????????if ( $this->enableRandName ) {108 ????????????$saveName = $prefix . uniqid() . ‘.‘ . $this->type;109 ????????}else {110 ????????????$saveName = $prefix . pathinfo( $imgPath )[‘filename‘] . ‘.‘ . $this->type;111 ????????}112 ????????return $saveName;113 ????}114 115 ????protected function calcPosition( $pos, $imageInfo, $waterImageInfo ){116 ????????$x = 0; $y = 0;117 ????????switch( $pos ) {118 ????????????case 1: //左上角119 ????????????????$x = 0; $y = 0;120 ????????????????break;121 ????????????case 2: //上中122 ????????????????$x = ( $imageInfo[‘width‘] - $waterImageInfo[‘width‘] ) / 2;123 ????????????????$y = 0;124 ????????????????break;125 ????????????case 3: //右上角126 ????????????????$x = $imageInfo[‘width‘] - $waterImageInfo[‘width‘];127 ????????????????$y = 0;128 ????????????????break;129 ????????????case 4: //左边中间130 ????????????????$x = 0;131 ????????????????$y = ( $imageInfo[‘height‘] - $waterImageInfo[‘height‘] ) / 2;132 ????????????????break;133 ????????????case 5: //正中间134 ????????????????$x = ( $imageInfo[‘width‘] - $waterImageInfo[‘width‘] ) / 2;135 ????????????????$y = ( $imageInfo[‘height‘] - $waterImageInfo[‘height‘] ) / 2;136 ????????????????break;137 ????????????case 6: //右边中间138 ????????????????$x = $imageInfo[‘width‘] - $waterImageInfo[‘width‘];139 ????????????????$y = ( $imageInfo[‘height‘] - $waterImageInfo[‘height‘] ) / 2;140 ????????????????break;141 ????????????case 7: //左下角142 ????????????????$x = 0;143 ????????????????$y = $imageInfo[‘height‘] - $waterImageInfo[‘height‘];144 ????????????????break;145 ????????????case 8: //中间下面146 ????????????????$x = ( $imageInfo[‘width‘] - $waterImageInfo[‘width‘] ) / 2;147 ????????????????$y = $imageInfo[‘height‘] - $waterInfo[‘height‘];148 ????????????????break;149 ????????????case 9: //右下角150 ????????????????$x = $imageInfo[‘width‘] - $waterImageInfo[‘width‘];151 ????????????????$y = $imageInfo[‘height‘] - $waterImageInfo[‘height‘];152 ????????????????break;153 ????????????case 0: //随机位置154 ????????????????$x = mt_rand( 0, $imageInfo[‘width‘] - $waterImageInfo[‘width‘] );155 ????????????????$y = mt_rand( 0, $imageInfo[‘height‘] - $waterImageInfo[‘height‘] );156 ????????????????break;157 ????????}158 ????????return [ ‘x‘ => $x, ‘y‘ => $y ];159 ????}160 161 ????public static function openImage( $imagePath ){162 ????????$mime = self::getImageInfo( $imagePath )[‘mime‘];163 ????????switch( $mime ){164 ????????????case ‘image/gif‘:165 ????????????????$im = imagecreatefromgif( $imagePath );166 ????????????????break;167 ????????????case ‘image/jpeg‘:168 ????????????????$im = imagecreatefromjpeg( $imagePath );169 ????????????????break;170 ????????????case ‘image/png‘:171 ????????????????$im = imagecreatefrompng( $imagePath );172 ????????????????break;173 ????????????case ‘image/wbmp‘:174 ????????????????$im = imagecreatefromwbmp( $imagePath );175 ????????????????break;176 ????????}177 ????????return $im;178 ????}179 180 ????public function check( $imgInfo, $waterInfo ){181 ????????if( $imgInfo[‘width‘] < $waterInfo[‘width‘]182 ???????????|| $imgInfo[‘height‘] < $waterInfo[‘height‘] ){183 ????????????return false;184 ????????}185 ????????return true;186 ????}187 188 ????/*189 ?????* @srcImg 原图片路径190 ?????* @dstImg 目标图片路径191 ?????* @newWidth 缩放后新的图片宽度192 ?????* @newHeight 缩放后新的图片高度193 ?????* */194 ????public function thumb( $srcImg, $newWidth, $newHeight, $prefix="thumb_" ){195 ????????$srcIm = self::openImage( $srcImg );196 ????????$srcInfo = self::getImageInfo( $srcImg );197 ????????$srcW = $srcInfo[‘width‘];198 ????????$srcH = $srcInfo[‘height‘];199 ????????$this->type = explode( ‘/‘, $srcInfo[‘mime‘] )[1];200 ????????$ratio_w = $newWidth / $srcW;201 ????????$ratio_h = $newHeight / $srcH;202 ????????$ratio = 1.0;203 204 ????????//缩放后的图片 宽度/高度 都比原图大或者小205 ????????if( ( $ratio_w < 1 && $ratio_h < 1 ) || ( $ratio_w > 1 && $ratio_h > 1 ) ) {206 ????????????if( $ratio_w < $ratio_h ) {207 ????????????????$ratio = $ratio_h;208 ????????????}else {209 ????????????????$ratio = $ratio_w;210 ????????????}211 ????????????$tmp_w = (int)( $newWidth / $ratio );212 ????????????$tmp_h = (int)( $newHeight / $ratio );213 ????????????$tmp_im = imagecreatetruecolor( $tmp_w, $tmp_h );214 ????????????//生成一个以原图片最大边长,比例为ratio的中间图像215 ????????????imagecopy( $tmp_im, $srcIm, 0, 0, 0, 0, $tmp_w, $tmp_h );216 ????????????//定义一个目标尺寸的图像217 ????????????$newIm = imagecreatetruecolor( $newWidth, $newHeight );218 ????????????imagecopyresampled( $newIm, $tmp_im, 0, 0, 0, 0, $newWidth, $newHeight, $tmp_w, $tmp_h );219 ????????}else {220 ????????//缩放后的图片 宽度/高度 一个比原图大, 另一个比原图小221 ????????????$ratio = $ratio_h > $ratio_w ? $ratio_h : $ratio_w; //取比例大的那个值222 223 ????????????$tmp_w=(int)($srcW * $ratio);224 ????????????$tmp_h=(int)($srcH * $ratio);225 ????????????$tmp_im = imagecreatetruecolor($tmp_w, $tmp_h);226 227 ????????????imagecopyresampled($tmp_im, $srcIm, 0, 0, 0, 0, $tmp_w, $tmp_h, $srcW, $srcH );228 229 ????????????$newIm = imagecreatetruecolor($newWidth, $newHeight);230 ????????????imagecopy($newIm, $tmp_im, 0, 0, 0, 0, $newWidth, $newHeight);231 ????????}232 ????????//处理后的文件的保存名字233 ????????$saveName = $this->getFileName( $newIm, $prefix );234 235 ????????//拼凑完整的文件名称236 ????????$fullPath = rtrim( $this->path, ‘/‘ ) . ‘/‘ . $saveName;237 ????????238 239 ????????$this->saveImage( $newIm, $fullPath );240 241 ????????imagedestroy( $newIm );242 243 ????????return $fullPath;244 ????}245 }246 247 $img = new Image();248 //$img->waterMark( ‘1.jpg‘, ‘logo.png‘, 5, 30 );249 echo $img->thumb( ‘1.jpg‘, 330, 495 );250 251 252 ?>