php图像处理类实例

<?php
/**
 * image 类
 */
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 $imagewidth 原图像宽
 * @access private
 */
 public $width = null;
 /**
 * @var int $imageheight 原图像高
 * @access private
 */
 public $height = null;
 /**
 * @var int $imagetype 原图像类型
 * @access private
 */
 public $type = 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];
 $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,0,0,$width,$height,$bg);
 $tox=ceil(($width-$endwidth)/2);
 $toy=ceil(($height-$endheight)/2);
 if($tox<0) $tox=0;
 if($toy<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, 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';
 $validlength = 52;
 } elseif ($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,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;$i<strlen($valid);$i++){ 
 imagestring($this->newresource,5,$i*$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, $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;
 }
}
?>