<"imagecreatefrom{$this->type}";
  $this->image=$fun($src);
 }
 /**
  * 文字水印
  * @param [type] $font  字体
  * @param [type] $content 内容
  * @param [type] $size  文字大小
  * @param [type] $col  文字颜色（四元数组）
  * @param array $location 位置 
  * @param integer $angle 倾斜角度
  * @return [type]   
  */
 public function fontMark($font,$content,$size,$col,$location,$angle=0){
  $col=imagecolorallocatealpha($this->image, $col['0'], $col['1'], $col['2'],$col['3']);
  imagettftext($this->image, $size, $angle, $location['0'], $location['1'], $col,$font,$content);
 }
 /**
  * 图片水印
  * @param [type] $imageMark 水印图片地址
  * @param [type] $dst  水印图片在原图片中的位置
  * @param [type] $pct  透明度
  * @return [type]   
  */
 public function imageMark($imageMark,$dst,$pct){
  $info2=getimagesize($imageMark);
  $type=image_type_to_extension($info2['2'],false);
  $func2="imagecreatefrom".$type;
  $water=$func2($imageMark);
  imagecopymerge($this->image, $water, $dst[0], $dst[1], 0, 0, $info2['0'], $info2['1'], $pct);
  imagedestroy($water);
 }
 /**
  * 压缩图片
  * @param [type] $thumbSize 压缩图片大小
  * @return [type]   [description]
  */
 public function thumb($thumbSize){
  $imageThumb=imagecreatetruecolor($thumbSize[0], $thumbSize[1]);
  imagecopyresampled($imageThumb, $this->image, 0, 0, 0, 0, $thumbSize[0], $thumbSize[1], $this->info['0'], $this->info['1']);
  imagedestroy($this->image);
  $this->image=$imageThumb;
 }
 /**
 * 裁剪图片
  * @param [type] $cutSize 裁剪大小
  * @param [type] $location 裁剪位置
  * @return [type]   [description]
  */
  public function cut($cutSize,$location){
   $imageCut=imagecreatetruecolor($cutSize[0],$cutSize[1]);
   imagecopyresampled($imageCut, $this->image, 0, 0, $location[0], $location[1],$cutSize[0],$cutSize[1],$cutSize[0],$cutSize[1]);
   imagedestroy($this->image);
   $this->image=$imageCut;
  }
 /**
  * 展现图片
  * @return [type] [description]
  */
 public function show(){
  header("content-type:".$this->info['mime']);
  $funn="image".$this->type;
  $funn($this->image);
 }
 /**
  * 保存图片
 * @param [type] $newname 新图片名
 * @return [type]   [description]
 */
  public function save($newname){
   header("content-type:".$this->info['mime']);
   $funn="image".$this->type;
   $funn($this->image,$newname.'.'.$this->type);
  }
  public function __destruct(){
   imagedestroy($this->image);
  }
 }
 "color: #ff0000">给图片添加水印代码：

先看文件check_image_addwatermark.php代码


<"arial";
//upload_image.php页面传递过来的参数，如果是上传图片
if($_POST['submit'] == 'Upload')
{
 if($_FILES['uploadfile']['error'] != UPLOAD_ERR_OK)
 {
  switch($_FILES['uploadfile']['error'])
  {
   case UPLOAD_ERR_INI_SIZE:
    die('The uploaded file exceeds the upload_max_filesize directive');
   break;
   case UPLOAD_ERR_FORM_SIZE:
    die('The upload file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form');
   break;
   case UPLOAD_ERR_PARTIAL:
    die('The uploaded file was only partially uploaded');
   break;
   case UPLOAD_ERR_NO_FILE:
    die('No file was uploaded');
   break;
   case UPLOAD_ERR_NO_TMP_DIR:
    die('The server is missing a temporary folder');
   break; 
   case UPLOAD_ERR_CANT_WRITE:
    die('The server fail to write the uploaded file to the disk');
   break;  
   case UPLOAD_ERR_EXTENSION:
    die('The upload stopped by extension');
   break;    
  }
 }
 $image_caption = $_POST['caption'];
 $image_username = $_POST['username'];
 $image_date = date('Y-m-d');
 list($width,$height,$type,$attr) = getimagesize($_FILES['uploadfile']['tmp_name']);
 $error = 'The file you upload is not a supported filetype';
 switch($type)
 {
  case IMAGETYPE_GIF:
   $image = imagecreatefromgif($_FILES['uploadfile']['tmp_name']) or die($error);
  break;
  case IMAGETYPE_JPEG:
   $image = imagecreatefromjpeg($_FILES['uploadfile']['tmp_name']) or die($error);
  break;
  case IMAGETYPE_PNG:
   $image = imagecreatefrompng($_FILES['uploadfile']['tmp_name']) or die($error);
  break;
  default:
  break;
 }
 $query = 'insert into images(image_caption,image_username,image_date) values("'.$image_caption.'" , "'.$image_username.'","'.$image_date.'")';
 $result = mysql_query($query,$db) or die(mysql_error($db));
 $last_id = mysql_insert_id();
 // $imagename = $last_id.'.jpg';
 // imagejpeg($image,$dir.'/'.$imagename);
 // imagedestroy($image);
 $image_id = $last_id;
 imagejpeg($image , $dir.'/'.$image_id.'.jpg');
 imagedestroy($image);
}
else //如果图片已经上传，则从数据库中取图片名字
{
 $query = 'select image_id,image_caption,image_username,image_date from images where image_id='.$_POST['id'];
 $result = mysql_query($query,$db) or die(mysql_error($db));
 extract(mysql_fetch_assoc($result));
 list($width,$height,$type,$attr) = getimagesize($dir.'/'.$image_id.'.jpg');
}
//如果是保存图片
if($_POST['submit'] == 'Save')
{
 if(isset($_POST['id']) && ctype_digit($_POST['id']) && file_exists($dir.'/'.$_POST['id'].'.jpg'))
 {
  $image = imagecreatefromjpeg($dir.'/'.$_POST['id'].'.jpg');
 }
 else
 {
  die('invalid image specified');
 }
 $effect = (isset($_POST['effect'])) "images/<" alt="" />
  </body>
 </html>
<"images/<" alt="" style="float:left;" />-->
  </body>
 </html>
 <"<" style="float:left;" alt="" />
 <table>
  <tr>
   <td>Image save as:</td>
   <td><"<" method="post">
  <div>
   <input type="hidden" name="id" value="<"/>
   Filter:<select name="effect" id="">
    <option value="-1">None</option>
    <"'.IMG_FILTER_GRAYSCALE.'" ';
     if(isset($_POST['effect']) && $_POST['effect'] == IMG_FILTER_GRAYSCALE)
     {
      echo 'selected="selected"';
     }
     echo ' >Black and white</option>';
     echo '<option value="'.IMG_FILTER_GAUSSIAN_BLUR.'"';
     if(isset($_POST['effect']) && $_POST['effect'] == IMG_FILTER_GAUSSIAN_BLUR)
     {
      echo ' selected="selected"';
     }
     echo '>Blur</option>';
     echo '<option value="'.IMG_FILTER_EMBOSS.'"';
     if(isset($_POST['effect']) && $_POST['effect'] == IMG_FILTER_EMBOSS)
     {
      echo 'selected="selected"';
     }
     echo '>Emboss</option>';
     echo '<option value="'.IMG_FILTER_NEGATE.'"';
     if(isset($_POST['effect']) && $_POST['effect'] == IMG_FILTER_NEGATE)
     {
      echo 'selected="selected"';
     }
     echo '>Negative</option>';
    "checkbox" name="emb_caption"';
    if(isset($_POST['emb_caption']))
    {
     echo ' checked="checked"';
    }
    echo ' />Embed caption in image"checkbox" name="emb_logo" ';
    if(isset($_POST['emb_logo']))
    {
     echo 'checked="checked"';
    }
    echo ' />Embed watermarked logo in image"submit" value="Preview" name="submit" /><br /><br />
   <input type="submit" value="Save" name="submit" />
  </div>
 </form>
<"htmlcode">

<"arial";
if(isset($_GET['id']) && ctype_digit($_GET['id']) && file_exists($dir.'/'.$_GET['id'].'.jpg'))
{
 $image = imagecreatefromjpeg($dir.'/'.$_GET['id'].'.jpg');
}
else
{
 die('invalid image specified');
}
$effect = (isset($_GET['e'])) "text-align: center">

注意主要的逻辑就是通过 imagecopymerge() 方法把两个图片合并在一起造成水印效果。来看看这个方法的方法原型和参数：


bool imagecopymerge ( resource $dst_im , resource $src_im , int $dst_x , int $dst_y , int$src_x , int $src_y , int $src_w , int $src_h , int $pct )



将 src_im 图像中坐标从 src_x，src_y 开始，宽度为 src_w，高度为 src_h 的一部分拷贝到 dst_im 图像中坐标为 dst_x 和 dst_y 的位置上。两图像将根据 pct 来决定合并程度，其值范围从 0 到 100。当 pct = 0 时，实际上什么也没做，当为 100 时对于调色板图像本函数和 imagecopy() 完全一样，它对真彩色图像实现了 alpha 透明。


以上内容是本文介绍PHP给图片添加水印 压缩 剪切的封装类的全部内容，希望大家对本文介绍感兴趣。

                                
                                

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