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本文实例讲述了PHP图像处理类。分享给大家供大家参考。具体如下:
PHP;"> fileName = $fileName; if ($this->fileName) { $this->getSrcImageInfo(); } } /** * 取源图像信息 * @access private * @return void */ private function getSrcImageInfo() { $info = $this->getImageInfo(); $this->imageWidth = $info[0]; $this->imageHeight = $info[1]; $this->imageType = $info[2]; $this->width = $info[0]; $this->height = $info[1]; $this->type = $info[2]; } /** * 取图像信息 * @param string $fileName 文件名 * @access private * @return array */ private function getImageInfo($fileName = NULL) { if ($fileName==NULL) { $fileName = $this->filename; } $info = getimagesize($fileName); return $info; } /** * 创建源图像GD 资源 * @access private * @return void */ private function createSrcImage () { $this->imageresource = $this->createImageFromFile(); } /** * 跟据文件创建图像GD 资源 * @param String $filename 文件名 * @return gd resource */ public function createImageFromFile($filename = NULL) { if (!$fileName) { $filename = $this->filename; $imgType = $this->imageType; } if (!is_readable($fileName) || !file_exists($fileName)) { throw new Exception('Unable to open file "' . $filename . '"'); } if (!$imgTypE) { $imageInfo = $this->getImageInfo($fileName); $imgType = $imageInfo[2]; } switch ($imgTypE) { case IMAGETYPE_GIF: $tempresource = imagecreatefromgif($fileName); break; case IMAGETYPE_JPEG: $tempresource = imagecreatefromjpeg($fileName); break; case IMAGETYPE_PNG: $tempresource = imagecreatefrompng($fileName); break; case IMAGETYPE_WBMP: $tempresource = imagecreatefromwbmp($fileName); break; case IMAGETYPE_XBM: $tempresource = imagecreatefromxbm($fileName); break; default: throw new Exception('Unsupport image type'); } return $tempresource; } /** * 改变图像大小 * @param int $width 宽 * @param int $height 高 * @param String $flag 一般而言,允许截图则用4,不允许截图则用1; 假设要求一个为4:3比例的图像,则:4=如果太长则自动刪除一部分 0=长宽转换成参数指定的 1=按比例缩放,自动判断太长还是太宽,长宽约束在参数指定内 2=以宽为约束缩放 3=以高为约束缩放 * @param String $bgcolor 如果不为null,则用这个参数指定的颜色作为背景色,并且图像扩充到指定高宽,该参数应该是一个数组; * @return String */ public function resizeImage($width,$height,$flag=1,$bgcolor=null) { $widthRatio = $width/$this->imageWidth; $heightRatio = $height/$this->imageHeight; switch ($flag) { case 1: if ($this->imageHeight < $height="" &&="" $this-="">imageWidth < $width)="" {="" $endwidth="$this-">imageWidth; $endHeight = $this->imageHeight; //return; } elseif (($this->imageHeight * $widthRatio)>$height) { $endWidth = ceil($this->imageWidth * $heightRatio); $endHeight = $height; } else { $endWidth = $width; $endHeight = ceil($this->imageHeight * $widthRatio); } break; case 2: $endWidth = $width; $endHeight = ceil($this->imageHeight * $widthRatio); break; case 3: $endWidth = ceil($this->imageWidth * $heightRatio); $endHeight = $height; break; case 4: $endWidth2 = $width; $endHeight2 = $height; if ($this->imageHeight < $height="" &&="" $this-="">imageWidth < $width)="" {="" $endwidth="$this-">imageWidth; $endHeight = $this->imageHeight; //return; } elseif (($this->imageHeight * $widthRatio)<$height) {="" $endwidth="ceil($this-">imageWidth * $heightRatio); $endHeight = $height; } else { $endWidth = $width; $endHeight = ceil($this->imageHeight * $widthRatio); } break; default: $endWidth = $width; $endHeight = $height; break; } if ($this->imageresource==NULL) { $this->createSrcImage(); } if($bgcolor){ $this->newresource = imagecreatetruecolor($width,$height); $bg=ImageColorAllocate($this->newresource,$bgcolor[0],$bgcolor[1],$bgcolor[2]); ImageFilledRectangle($this->newresource,$width,$bg); $tox=ceil(($width-$endWidth)/2); $toy=ceil(($height-$endHeight)/2); if($tox<0) $tox="0;">0)><0) $toy="0;" }else="" if="" ($flag="=4)" {="" $this-="">newresource = imagecreatetruecolor($endWidth2,$endHeight2); }else { $this->newresource = imagecreatetruecolor($endWidth,$endHeight); } $this->newResType = $this->imageType; imagecopyresampled($this->newresource,$this->imageresource,$tox,$toy,$endWidth,$endHeight,$this->imageWidth,$this->imageHeight); } /** * 给图像加水印 * @param String $waterContent 水印内容可以是图像文件名,也可以是文字 * @param int $pos 位置0-9可以是数组 * @param int $textFont 字体大字,当水印内容是文字时有效 * @param String $textColor 文字颜色,当水印内容是文字时有效 * @return String */ public function waterMark($waterContent,$pos = 0,$textFont=5,$textColor="#ffffff") { $isWaterImage = file_exists($waterContent); if ($isWaterImagE) { $waterImgRes = $this->createImageFromFile($waterContent); $waterImgInfo = $this->getImageInfo($waterContent); $waterWidth = $waterImgInfo[0]; $waterHeight = $waterImgInfo[1]; } else { $waterText = $waterContent; //$temp = @imagettfbBox(ceil($textFont*2.5),"./cour.ttf",$waterContent); if ($temp) { $waterWidth = $temp[2]-$temp[6]; $waterHeight = $temp[3]-$temp[7]; } else { $waterWidth = 100; $waterHeight = 12; } } if ($this->imageresource==NULL) { $this->createSrcImage(); } switch($pos) { case 0://随机 $posx = rand(0,($this->imageWidth - $waterWidth)); $posy = rand(0,($this->imageHeight - $waterHeight)); break; case 1://1为顶端居左 $posx = 0; $posy = 0; break; case 2://2为顶端居中 $posx = ($this->imageWidth - $waterWidth) / 2; $posy = 0; break; case 3://3为顶端居右 $posx = $this->imageWidth - $waterWidth; $posy = 0; break; case 4://4为中部居左 $posx = 0; $posy = ($this->imageHeight - $waterHeight) / 2; break; case 5://5为中部居中 $posx = ($this->imageWidth - $waterWidth) / 2; $posy = ($this->imageHeight - $waterHeight) / 2; break; case 6://6为中部居右 $posx = $this->imageWidth - $waterWidth; $posy = ($this->imageHeight - $waterHeight) / 2; break; case 7://7为底端居左 $posx = 0; $posy = $this->imageHeight - $waterHeight; break; case 8://8为底端居中 $posx = ($this->imageWidth - $waterWidth) / 2; $posy = $this->imageHeight - $waterHeight; break; case 9://9为底端居右 $posx = $this->imageWidth - $waterWidth-20; $posy = $this->imageHeight - $waterHeight-10; break; default://随机 $posx = rand(0,($this->imageHeight - $waterHeight)); break; } imagealphablending($this->imageresource,truE); if($isWaterImagE) { imagecopy($this->imageresource,$waterImgRes,$posx,$posy,$waterWidth,$waterHeight); } else { $R = hexdec(substr($textColor,1,2)); $G = hexdec(substr($textColor,3,2)); $B = hexdec(substr($textColor,5)); $textColor = imagecolorallocate($this->imageresource,$R,$G,$B); imageString ($this->imageresource,$textFont,$waterText,$textColor); } $this->newresource = $this->imageresource; $this->newResType = $this->imageType; } /** * 生成验证码图片 * @param int $width 宽 * @param String $height 高 * @param int $length 长度 * @param int $validType 0=数字,1=字母,2=数字加字母 * @param String $textColor 文字颜色 * @param String $BACkgroundColor 背景颜色 * @return void */ public function imageValidate($width,$length = 4,$validType = 1,$textColor = '#000000',$BACkgroundColor = '#ffffff') { if ($validType==1) { $validString = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRstuVWXYZ'; $validLength = 52; } elseif ($validType==2) { $validString = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRstuVWXYZ'; $validLength = 62; } else { $validString = '123456789'; $validLength = 9; } srand((int)time()); $valid = ''; for ($i=0; $i<$length; $i++)="" {="" $valid="" .="$validString{rand(0,$validLength-1)};" }="" $this-="">newresource = imagecreate($width,$height); $bgR = hexdec(substr($BACkgroundColor,2)); $bgG = hexdec(substr($BACkgroundColor,2)); $bgB = hexdec(substr($BACkgroundColor,5,2)); $BACkgroundColor = imagecolorallocate($this->newresource,$bgR,$bgG,$bgB); $tR = hexdec(substr($textColor,2)); $tG = hexdec(substr($textColor,2)); $tB = hexdec(substr($textColor,2)); $textColor = imagecolorallocate($this->newresource,$tR,$tG,$tB); for ($i=0;$inewresource,$i*$width/$length+3,2,$valid[$i],$textColor); } $this->newResType = IMAGETYPE_JPEG; return $valid; } /** * 显示输出图像 * @return void */ public function display($filename='',$quality=100) { $imgType = $this->newResType; $imageSrc = $this->newresource; switch ($imgTypE) { case IMAGETYPE_GIF: if ($filename=='') { header('Content-type: image/gif'); } imagegif($imageSrc,$filename,$quality); break; case IMAGETYPE_JPEG: if ($filename=='') { header('Content-type: image/jpeg'); } imagejpeg($imageSrc,$quality); break; case IMAGETYPE_PNG: if ($filename=='') { header('Content-type: image/png'); imagepng($imageSrc); } else { imagepng($imageSrc,$fileName); } break; case IMAGETYPE_WBMP: if ($filename=='') { header('Content-type: image/wbmp'); } imagewbmp($imageSrc,$quality); break; case IMAGETYPE_XBM: if ($filename=='') { header('Content-type: image/xbm'); } imagexbm($imageSrc,$quality); break; default: throw new Exception('Unsupport image type'); } imagedestroy($imageSrc); } /** * 保存图像 * @param int $filenameType 文件名类型 0使用原文件名,1使用指定的文件名,2在原文件名加上后缀,3产生随机文件名 * @param String $folder 文件夹路径 为空为与原文件相同 * @param String $param 参数$filenameType为1时为文件名2时为后缀 * @return void */ public function save($filenameType = 0,$folder = NULL,$param = '_miniature') { if ($folder==NULL) { $folder = dirname($this->fileName).DIRECTORY_SEPARATOR; } $fileExtName = FileSystem::fileExt($this->filename,truE); $fileBesicName = FileSystem::getBasicName($this->filename,falsE); switch ($filenameTypE) { case 1: $newFilename = $folder.$param; break; case 2: $newFilename = $folder.$fileBesicName.$param.$fileExtName; break; case 3: $tmp = date('ymdHis'); $fileBesicName = $tmp; $i = 0; while (file_exists($folder.$fileBesicName.$fileExtName)) { $fileBesicName = $tmp.$i; $i++; } $newFilename = $folder.$fileBesicName.$fileExtName; break; default: $newFilename = $this->filename; break; } $this->display($newFileName); return $newFilename; } } ?> $length;>0)>$height)>
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