php 图片处理类，缩略，水印_PHP教程
class Image {
/**
* @var string $fileName 文件名
* @access private
*/
private $fileName = '';
/**
* @var gd resource $imageResource 原图像
* @access private
*/
private $imageResource = NULL;
/**
* @var int $imageWidth 原图像宽
* @access private
*/
private $imageWidth = NULL;
/**
* @var int $imageHeight 原图像高
* @access private
*/
private $imageHeight = NULL;
/**
* @var int $imageType 原图像类型
* @access private
*/
private $imageType = NULL;
/**
* @var int $newResource 新图像
* @access private
*/
private $newResource = NULL;
/**
* @var int $newResType 新图像类型
* @access private
*/
private $newResType = NULL;
/**
* 构造函数
* @param string $fileName 文件名
*/
public function __construct($fileName = NULL) {
$this->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];
}
/**
* 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('错误的图片格式，或图片有问
题！');
}
return $tempResource;
}
/**
* 改变图像大小
* @param int $width 宽
* @param int $height 高
* @param string $flag 按什么方式改变 0=长宽转换成参数指定的 1=按比
例缩放，长宽约束在参数指定内，2=以宽为约束缩放，3=以高为约束缩放
* @return string
*/
public function resizeImage($width, $height, $flag=1) {
global $cfg;
$widthRatio = $width/$this->imageWidth;
$heightRatio = $height/$this->imageHeight;
switch ($flag) {
case 1:
if ($this->imageHeight
>imageWidth $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
>imageWidth $endWidth = $this->imageWidth;
$endHeight = $this->imageHeight;
//return;
} elseif (($this->imageHeight * $widthRatio)
$endWidth = ceil($this->imageWidth *
$heightRatio);
$endHeight = $height;
} else {
$endWidth = $width;
$endHeight = ceil($this->imageHeight *
$widthRatio);
}
break;
case 5:
$endWidth2 = $width;
$endHeight2 = $height;
if ($this->imageHeight > $height && $this-
>imageWidth > $width) {
//都大
$ratio = max($this->imageHeight/
$height,$this->imageWidth/$width);
}elseif ($this->imageHeight > $height){
$ratio = $this->imageHeight/$height;
}elseif ( $this->imageWidth > $width){
$ratio =$this->imageWidth/$width;
}else{
$ratio =1;
}
$endWidth = $this->imageWidth / $ratio;
$endHeight = $this->imageHeight / $ratio;
break;
default:
$endWidth = $width;
$endHeight = $height;
break;
}
if ($this->imageResource==NULL) {
$this->createSrcImage();
}
if($flag == 5){
//直接缩略
$this->newResource = imagecreatefromjpeg($cfg
['path']['data'].'blank_thumb.jpg');
}elseif ($flag==4) {
$this->newResource = imagecreatetruecolor
($endWidth2,$endHeight2);
} else {
$this->newResource = imagecreatetruecolor
($endWidth,$endHeight);
}
$this->newResType = $this->imageType;
if($flag == 5){
$dest_x = ($width-$endWidth)/2;
$dest_y = ($height-$endHeight)/2;
imagecopyresampled($this->newResource, $this-
>imageResource, $dest_x, $dest_y, 0, 0, $endWidth, $endHeight,$this-
>imageWidth,$this->imageHeight);
}else{
imagecopyresampled($this->newResource, $this-
>imageResource, 0, 0, 0, 0, $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
($textFont*2.5),0,"./cour.ttf",$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->imageWidth - $waterWidth));
$posY = rand(0,($this->imageHeight - $waterHeight));
break;
}
imagealphablending($this->imageResource, true);
if($isWaterImage) {
imagecopy($this->imageResource, $waterImgRes, $posX,
$posY, 0, 0, $waterWidth,$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, $posX,
$posY, $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, $height, $length = 4,
$validType = 1, $textColor = '#000000', $backgroundColor = '#ffffff') {
if ($validType==1) {
//$validString =
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
//$validLength = 52;
//no i no l
$validString =
'abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNOPQRSTUVWXYZ';
$validLength = 48;
} elseif ($validType==2) {
//$validString =
'0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
//$validLength = 62;
//no i no l no 1
$validString =
'023456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNOPQRSTUVWXYZ';
$validLength = 57;
} else {
$validString = '0123456789';
$validLength = 10;
}
srand((int)time());
$valid = '';
for ($i=0; $i $valid .= $validString{rand(0, $validLength-1)};
}
$this->newResource = imagecreate($width,$height);
$bgR = hexdec(substr($backgroundColor,1,2));
$bgG = hexdec(substr($backgroundColor,3,2));
$bgB = hexdec(substr($backgroundColor,5,2));
$backgroundColor = imagecolorallocate($this->newResource,
$bgR, $bgG, $bgB);
$tR = hexdec(substr($textColor,1,2));
$tG = hexdec(substr($textColor,3,2));
$tB = hexdec(substr($textColor,5,2));
$textColor = imagecolorallocate($this->newResource, $tR,
$tG, $tB);
for ($i=0;$i
$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=60) {
$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, $fileName, $quality);
break;
case IMAGETYPE_PNG:
if ($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, $fileName, $quality);
break;
case IMAGETYPE_XBM:
if ($fileName=='') {
header('Content-type: image/xbm');
}
imagexbm($imageSrc, $fileName, $quality);
break;
default:
throw new Exception('Unsupport image type');
}
imagedestroy($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2时为文件名加后缀
* @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;
$newFileName = $folder.basename($this-
>fileName);
//var_dump($newFileName);
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;
}
/**
* 剪切出选定区域
*
* @param string $srcimgurl 原图
* @param string $endimgurl 处理过的图
* @param int $x 坐标原点X
* @param int $y 坐标原点Y
* @param int $endimg_w 最终图宽
* @param int $endimg_h 最终图高
* @param int $border_w 末坐标X
* @param int $border_h 末坐标Y
* @param int $scale 原图缩放情况百分比
* @param int $fix 是否自动取值
*/
public function cutimg
($srcimgurl,$endimgurl,$x,$y,$endimg_w,$endimg_h,$border_w,$border_h,$scale=
100,$fix=0){
$path = dirname ($endimgurl);
if (!is_dir($path)) {
if(!@mkdir ($path, 0777)){
die ("{$path} 此目录不能创建,文件创建失败");
}
}
$ground_info = getimagesize($srcimgurl);
switch($ground_info[2]){
case 1:$im = imagecreatefromgif($srcimgurl);break;
case 2:$im = imagecreatefromjpeg($srcimgurl);break;
case 3:$im = imagecreatefrompng($srcimgurl);break;
default:die("图片格式不允许$srcimgurl");
}
if($fix){//方便截取头像的一部分
if($ground_info[0] $border_w=$ground_info[0];
$border_h=$endimg_h*$ground_info[0]/
$endimg_w;
}elseif($ground_info[0]>$ground_info[1]){
$border_h=$ground_info[1];
$border_w=$endimg_w*$ground_info[1]/
$endimg_h;
}else{
$border_w=$ground_info[0];
$border_h=$ground_info[1];
}
}
$newim = imagecreatetruecolor($endimg_w, $endimg_h);
$x=($x*100)/$scale;
$y=($y*100)/$scale;
$border_width=($border_w*100)/$scale;
$border_height=($border_h*100)/$scale;
imagecopyresampled($newim, $im, 0,0, $x,$y, $endimg_w,
$endimg_h, $border_width, $border_height );
if(function_exists("imagegif")){
switch($ground_info[2]){
case 1:imagegif($newim,$endimgurl);break;
case 2:imagejpeg($newim,$endimgurl);break;
case 3:imagepng($newim,$endimgurl);break;
default:die("errorMsg");
}
}elseif(function_exists("imagejpeg")){
imagejpeg($newim,$endimgurl);
}else{
imagepng($newim,$endimgurl);
}
imagedestroy ($newim);
imagedestroy ($im);
}
}