1 class ThumbImages{ 2 /** 3 * 生成缩略图 4 * prorate 按比例缩放 5 * distortion 扭曲型缩图 6 * cut 最小裁剪后的缩图 7 * backFill 背景填充图 8 * clssname ThumbImages 9 * createtime:2014-1-14下午04:44:28 10 * author:lhm 11 * for example 12 * include 'ThumbImages.class.php' 13 * $th=new ThumbImages(array('imagePre'=>'', 14 * 'imagePath'=>'./uploads/thumb/', 15 * 'echoType'=>'file')); 16 * $th->setThumb($srcImage, 384, 300, 'prorate'); 17 */ 18 private $imagepre; //缩略图名称前缀 19 private $imagepath; //缩略图存放路径 20 private $srcImage=''; //源图路径 21 private $newImageName; //缩略图名称 22 private $imageType; //图片类型 23 private $echotype; //输出图片类型，link--直接输出到浏览器；file--保存为文件 24 private $im=''; //临时变量 25 private $originName=''; //源图名称 26 private $srcW=''; //源图宽 27 private $srcH=''; //源图高 28 private $errorNum=0; //错误号 29 private $errorMess='';//用来提供错误报告 30 31 32 public function __construct($options = array()){ 33 $allowOption = array('imagepre','imagepath','echotype'); 34 foreach($options as $key=>$val){ 35 $key = strtolower($key); 36 //查看用户参数中数组的下标是否和成员属性名相同 37 //if(!in_array($key,get_class_vars(get_class($this)))){ 38 if(!in_array($key, $allowOption)){ 39 $this->errorNum = -3; 40 $this->errorMess = $this->getError(); 41 continue 1; 42 } 43 $this->$key = $val; 44 } 45 } 46 /** 47 * 48 * 判断源文件路径、缩略图存放路径是否正确 49 * 判断GD库是否支持缩略图格式 50 * 初始化图片高宽、缩略图存放路径、缩略图生成方式 51 * @param string $srcImage 52 * @param int $toW 53 * @param int $toH 54 * @param string $method 55 * @param string $echotype 56 */ 57 public function setThumb($srcImage = '', $toW = 0, $toH = 0, $method = 'distortion'){ 58 $this->srcImage = $srcImage; 59 $imageName = explode('/', $this->srcImage); 60 $this->originName = $imageName[2]; 61 //检查源文件是否存在 62 if(empty($srcImage) || filetype($srcImage) != 'file'){ 63 $this->errorNum = 4; 64 $this->errorMess = $this->getError(); 65 return false; 66 } 67 //检查文件上传路径 68 if ($this->echotype == 'file'){ 69 if(!$this->checkImagePath()){ 70 $this->errorMess = $this->getError(); 71 return false; 72 } 73 } 74 $info = ''; 75 $data = getimagesize($this->srcImage, $info);//获取图像大小 76 $this->srcW = $data[0];//宽 77 $this->srcH = $data[1];//高 78 //检查GD库 79 if(!$this->checkGD($data[2])){ 80 $this->errorMess = $this->getError(); 81 return false; 82 } 83 $this->setImageName();//设置缩略图名称 84 $toFile = $this->imagepath.$this->newImageName;//缩略图存放路径 85 $return = $this->createImageMethod($method, $toFile, $toW, $toH); 86 return $return; 87 } 88 /** 89 * 90 * 初始化缩略图生成方式 91 * prorate 按比例缩放 92 * distortion 扭曲型缩图 93 * cut 最小裁剪后的缩图 94 * backFill 背景填充图 95 * @param string $method 96 * @param string $toFile 97 * @param int $toW 98 * @param int $toH 99 */ 100 private function createImageMethod($method, $toFile, $toW, $toH){ 101 switch ($method){ 102 case 'prorate': 103 $return = $this->prorate($toFile, $toW, $toH); 104 break; 105 case 'cut': 106 $return = $this->cut($toFile, $toW, $toH); 107 break; 108 case 'backFill': 109 $return = $this->backFill($toFile, $toW, $toH); 110 break; 111 default: 112 $return = $this->distortion($toFile, $toW, $toH); 113 } 114 return $return; 115 } 116 //生成扭曲型缩图 117 function distortion($toFile='', $toW=0, $toH=0){ 118 $cImg=$this->creatImage($this->im, $toW, $toH, 0, 0, 0, 0, $this->srcW, $this->srcH); 119 return $this->echoImage($cImg, $toFile); 120 imagedestroy($cImg); 121 } 122 123 //生成按比例缩放的缩图 124 function prorate($toFile, $toW, $toH){ 125 $toWH = $toW / $toH; 126 $srcWH = $this->srcW / $this->srcH; 127 if($toWH <= $srcWH){ 128 $ftoW = $toW; 129 $ftoH = $ftoW * ($this->srcH / $this->srcW); 130 }else{ 131 $ftoH = $toH; 132 $ftoW = $ftoH * ($this->srcW / $this->srcH); 133 } 134 if($this->srcW > $toW || $this->srcH > $toH){ 135 $cImg = $this->creatImage($this->im, $ftoW, $ftoH, 0, 0, 0, 0, $this->srcW, $this->srcH); 136 return $this->echoImage($cImg, $toFile); 137 imagedestroy($cImg); 138 }else{ 139 $cImg = $this->creatImage($this->im, $this->srcW, $this->srcH, 0, 0, 0, 0, $this->srcW, $this->srcH); 140 return $this->echoImage($cImg, $toFile); 141 imagedestroy($cImg); 142 } 143 } 144 145 //生成最小裁剪后的缩图 146 private function cut($toFile, $toW, $toH){ 147 $toWH = $toW/$toH; 148 $srcWH = $this->srcW / $this->srcH; 149 if($toWH <= $srcWH){ 150 $ctoH = $toH; 151 $ctoW = $ctoH * ($this->srcW / $this->srcH); 152 }else{ 153 $ctoW = $toW; 154 $ctoH = $ctoW * ($this->srcH / $this->srcW); 155 } 156 $allImg = $this->creatImage($this->im, $ctoW, $ctoH, 0, 0, 0, 0, $this->srcW, $this->srcH); 157 $cImg = $this->creatImage($allImg, $toW, $toH, 0, 0, ($ctoW-$toW) / 2, ($ctoH-$toH) / 2, $toW, $toH); 158 return $this->echoImage($cImg, $toFile); 159 imagedestroy($cImg); 160 imagedestroy($allImg); 161 } 162 163 //生成背景填充的缩图 164 private function backFill($toFile, $toW, $toH, $bk1=255, $bk2=255, $bk3=255){ 165 $toWH = $toW / $toH; 166 $srcWH = $this->srcW / $this->srcH; 167 if($toWH <= $srcWH){ 168 $ftoW = $toW; 169 $ftoH = $ftoW * ($this->srcH / $this->srcW); 170 }else{ 171 $ftoH = $toH; 172 $ftoW = $ftoH*($this->srcW / $this->srcH); 173 } 174 if(function_exists("imagecreatetruecolor")){ 175 @$cImg = imagecreatetruecolor($toW,$toH); 176 if(!$cImg){ 177 $cImg = imagecreate($toW,$toH); 178 } 179 }else{ 180 $cImg = imagecreate($toW,$toH); 181 } 182 $backcolor = imagecolorallocate($cImg, $bk1, $bk2, $bk3); //填充的背景颜色 183 imagefilledrectangle($cImg,0,0,$toW,$toH,$backcolor); 184 if($this->srcW > $toW || $this->srcH > $toH){ 185 $proImg = $this->creatImage($this->im,$ftoW,$ftoH,0,0,0,0,$this->srcW,$this->srcH); 186 if($ftoW < $toW){ 187 imagecopy($cImg, $proImg, ($toW - $ftoW) / 2, 0, 0, 0, $ftoW, $ftoH); 188 }else if($ftoH < $toH){ 189 imagecopy($cImg, $proImg, 0, ($toH-$ftoH) / 2, 0, 0, $ftoW, $ftoH); 190 }else{ 191 imagecopy($cImg, $proImg, 0, 0, 0, 0, $ftoW, $ftoH); 192 } 193 }else{ 194 imagecopymerge($cImg, $this->im, ($toW - $ftoW) / 2,($toH - $ftoH) / 2, 0, 0, $ftoW, $ftoH, 100); 195 } 196 return $this->echoImage($cImg, $toFile); 197 imagedestroy($cImg); 198 } 199 //创建图像 200 private function creatImage($img, $creatW, $creatH, $dstX, $dstY, $srcX, $srcY, $srcImgW, $srcImgH){ 201 if(function_exists("imagecreatetruecolor")){ 202 @$creatImg = imagecreatetruecolor($creatW, $creatH); 203 if($creatImg){ 204 imagecopyresampled($creatImg, $img, $dstX, $dstY, $srcX, $srcY, $creatW, $creatH, $srcImgW, $srcImgH); 205 }else{ 206 $creatImg=imagecreate($creatW,$creatH); 207 imagecopyresized($creatImg, $img, $dstX, $dstY, $srcX, $srcY, $creatW, $creatH, $srcImgW, $srcImgH); 208 } 209 }else{ 210 $creatImg=imagecreate($creatW, $creatH); 211 imagecopyresized($creatImg, $img, $dstX, $dstY, $srcX, $srcY, $creatW, $creatH, $srcImgW, $srcImgH); 212 } 213 return $creatImg; 214 } 215 216 //输出图片，link---只输出，不保存文件。file--保存为文件 217 function echoImage($img, $toFile){ 218 switch($this->echotype){ 219 case 'link': 220 if(function_exists('imagejpeg')) 221 return imagejpeg($img); 222 else 223 return imagepng($img); 224 break; 225 case 'file': 226 if(function_exists('imagejpeg')) 227 return imagejpeg($img,$toFile); 228 else 229 return imagepng($img,$toFile); 230 break; 231 } 232 } 233 /** 234 * 235 * 设置随机文件名称 236 * @access private 237 * @return string 238 */ 239 private function setRandName(){ 240 $fileName = date("YmdHis").rand(100,999); 241 return $fileName.'.'.$this->imageType; 242 } 243 private function setImageName(){ 244 if ($this->imagepre != ''){ 245 $this->newImageName = $this->imagepre.'_'.$this->setRandName(); 246 }else { 247 $this->newImageName = $this->setRandName(); 248 } 249 } 250 /** 251 * 252 * 用来检查文件上传路径 253 * @access private 254 * @return bool 255 */ 256 private function checkImagePath(){ 257 if(empty($this->imagepath)) { 258 $this->errorNum = -2; 259 return false; 260 } 261 262 if(!file_exists($this->imagepath) || !is_writable($this->imagepath)){ 263 if(!@mkdir($this->imagepath, 0755)){ 264 $this->errorNum = -1; 265 return false; 266 } 267 } 268 return true; 269 } 270 private function checkGD($imageType){ 271 switch ($imageType){ 272 case 1: 273 if(!function_exists("imagecreatefromgif")){ 274 $this->errorNum = 1; 275 return false; 276 } 277 $this->imageType = 'gif'; 278 $this->im = imagecreatefromgif($this->srcImage); 279 break; 280 case 2: 281 if(!function_exists("imagecreatefromjpeg")){ 282 $this->errorNum = 2; 283 return false; 284 } 285 $this->imageType = 'jpg'; 286 $this->im = imagecreatefromjpeg($this->srcImage); 287 break; 288 case 3: 289 if(!function_exists("imagecreatefrompng")){ 290 $this->errorNum = 3; 291 return false; 292 } 293 $this->imageType = 'png'; 294 $this->im = imagecreatefrompng($this->srcImage); 295 break; 296 default: 297 $this->errorNum = 0; 298 return false; 299 } 300 return true; 301 } 302 /** 303 * 304 * 用于获取上传后缩略图片的文件名 305 * @access public 306 * @return string 307 */ 308 public function getNewImageName(){ 309 return $this->newImageName; 310 } 311 312 /** 313 * 314 * 获取上传错误信息 315 * @access private 316 * @return string 317 */ 318 private function getError(){ 319 $str='生成缩略图<font color="red">'.$this->originName.'</font>时出错：'; 320 321 switch($this->errorNum){ 322 case 4: $str .= '没有找到需要缩略的图片'; 323 break; 324 case 3: $str .= '你的GD库不能使用png格式的图片，请使用其它格式的图片！'; 325 break; 326 case 2: $str .= '你的GD库不能使用jpeg格式的图片，请使用其它格式的图片！'; 327 break; 328 case 1: $str .= '你的GD库不能使用GIF格式的图片，请使用Jpeg或PNG格式！'; 329 break; 330 case -1: $str .= '建立存放缩略图目录失败，请重新指定缩略图目录'; 331 break; 332 case -2: $str .= '必须指定缩略图的路径'; 333 break; 334 case -3: $str .= '初始化参数出错'; 335 break; 336 default: $str .= '末知错误'; 337 } 338 339 return $str.'<br>'; 340 } 341 public function getErrorMsg() { 342 return $this->errorMess; 343 } 344 }