Kindeditor editor adds image upload watermark implementation method

This article mainly introduces the Kindeditor editor plus image upload watermark function in detail. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

KindEditor is an open source online HTML editor. Developers can use KindEditor to replace the traditional multi-line text input box (textarea) with a visual rich text input box. It can be seamlessly integrated with Java, .NET, PHP, ASP and other programs, and is more suitable for use in Internet applications such as CMS, shopping malls, forums, blogs, Wikis, and emails.
Main features:

Fast: small size, fast loading speed

Open source: open source code, high level, high quality

Bottom layer: built-in custom DOM class Library, precise operation of DOM

Extension: Based on plug-in design, all functions are plug-ins, and functions can be increased or decreased according to needs

Style: It is very easy to modify the editor style, just modify a CSS File

Compatible: Supports most mainstream browsers, such as IE, Firefox, Safari, Chrome, Opera

Go to the topic, the default editor does not have a watermark function when uploading images. The following is a detailed introduction:

Step one: Modify the upload_json.php file

You can find this file in the /php/ directory of the editor, add A function:

/*
  * 功能：PHP图片水印，水印支持图片或文字
  * 参数：
  * $groundImage 背景图片，即需要加水印的图片，暂只支持GIF,JPG,PNG格式；
  * $waterPos 水印位置，有10种状态，0为随机位置；
  *  1为顶端居左，2为顶端居中，3为顶端居右；
  *  4为中部居左，5为中部居中，6为中部居右；
  *  7为底端居左，8为底端居中，9为底端居右；
  * $waterImage 图片水印，即作为水印的图片，暂只支持GIF,JPG,PNG格式；
  * $alpha 水印透明度，取值1-100；
  * $waterText 文字水印，即把文字作为为水印，支持ASCII码，不支持中文；
  * $textFont 文字大小，值为1、2、3、4或5，默认为5；
  * $textColor 文字颜色，值为十六进制颜色值，默认为#FF0000(红色)；
  *
  * $waterImage 和 $waterText 最好不要同时使用，选其中之一即可，优先使用 $waterImage。
  * 当$waterImage有效时，参数$waterString、$stringFont、$stringColor均不生效。
  * 加水印后的图片的文件名和 $groundImage 一样。
*/
function imageWaterMark($groundImage, $waterPos=0, $waterImage='', $alpha=80, $waterText='', $water_fontfile, $textFont=9, $textColor='#FF0000'){
  $isWaterImage = FALSE;
  $formatMsg = '不支持该图片格式！请使用GIF、JPG、PNG格式的图片。';
  $fontFile = $water_fontfile;
  //读取水印文件
  if(!empty($waterImage) && file_exists($waterImage)){
    $isWaterImage = TRUE;
    $water_info = getimagesize($waterImage);
    $water_w = $water_info[0];//取得水印图片的宽
    $water_h = $water_info[1];//取得水印图片的高
    switch($water_info[2]){//取得水印图片的格式
      case 1:$water_im = imagecreatefromgif($waterImage);break;
      case 2:$water_im = imagecreatefromjpeg($waterImage);break;
      case 3:$water_im = imagecreatefrompng($waterImage);break;
      default:die($formatMsg);
    }
  }
  //读取背景图片
  if(!empty($groundImage) && file_exists($groundImage)){
    $ground_info = getimagesize($groundImage);
    $ground_w = $ground_info[0];//取得背景图片的宽
    $ground_h = $ground_info[1];//取得背景图片的高
    switch($ground_info[2]){//取得背景图片的格式
      case 1:$ground_im = imagecreatefromgif($groundImage);break;
      case 2:$ground_im = imagecreatefromjpeg($groundImage);break;
      case 3:$ground_im = imagecreatefrompng($groundImage);break;
      default:die($formatMsg);
    }
  }else{
    alert("水印图片不存在！");
  }
  //水印位置
  if($isWaterImage){//图片水印
    $w = $water_w;
    $h = $water_h;
    $label = "图片的";
  }else{//文字水印
    $temp = imagettfbbox($textFont, 0, $fontFile, $waterText);//取得使用 TrueType 字体的文本的范围
    $w = $temp[2] - $temp[6];
    $h = $temp[3] - $temp[7];
    unset($temp);
    $label = "文字区域";
  }
  if(($ground_w<$w) || ($ground_h<$h)){
    echo "需要加水印的图片的长度或宽度比水印".$label."还小，无法生成水印！";
    return;
  }
  switch($waterPos){
    case 0://随机
    $posX = rand(0,($ground_w - $w));
    $posY = rand(0,($ground_h - $h));
    break;
    case 1://1为顶端居左
    $posX = 0;
    $posY = 0;
    break;
    case 2://2为顶端居中
    $posX = ($ground_w - $w) / 2;
    $posY = 0;
    break;
    case 3://3为顶端居右
    $posX = $ground_w - $w;
    $posY = 0;
    break;
    case 4://4为中部居左
    $posX = 0;
    $posY = ($ground_h - $h) / 2;
    break;
    case 5://5为中部居中
    $posX = ($ground_w - $w) / 2;
    $posY = ($ground_h - $h) / 2;
    break;
    case 6://6为中部居右
    $posX = $ground_w - $w;
    $posY = ($ground_h - $h) / 2;
    break;
    case 7://7为底端居左
    $posX = 0;
    $posY = $ground_h - $h;
    break;
    case 8://8为底端居中
    $posX = ($ground_w - $w) / 2;
    $posY = $ground_h - $h;
    break;
    case 9://9为底端居右
    $posX = $ground_w - $w;
    $posY = $ground_h - $h;
    if(!$isWaterImage){
    $posY = $ground_h - $h-20;
    }
    break;
    default://随机
    $posX = rand(0,($ground_w - $w));
    $posY = rand(0,($ground_h - $h));
    break;
  }
  //设定图像的混色模式
  imagealphablending($ground_im, true);
  if($isWaterImage){//图片水印
    //imagecopy($ground_im, $water_im, $posX, $posY, 0, 0, $water_w,$water_h);//拷贝水印到目标文件
    //生成混合图像
    imagecopymerge($ground_im, $water_im, $posX, $posY, 0, 0, $water_w, $water_h, $alpha);
  } else {//文字水印
    if( !empty($textColor) && (strlen($textColor)==7)){
      $R = hexdec(substr($textColor,1,2));
      $G = hexdec(substr($textColor,3,2));
      $B = hexdec(substr($textColor,5));
    } else {
      die("水印文字颜色格式不正确！");
    }
    imagestring($ground_im, $textFont, $posX, $posY, $waterText, imagecolorallocate($ground_im, $R, $G, $B));
  }
  //生成水印后的图片
  @unlink($groundImage);
  switch($ground_info[2]){//取得背景图片的格式
    case 1:imagegif($ground_im,$groundImage);break;
    case 2:imagejpeg($ground_im,$groundImage,100);break;//注意这里的100，经测试，100是图片质量最佳的，但文件大小会增加很多，95的时候质量还不错，大小和原来的差不多。作者采用95的值。
    case 3:imagepng($ground_im,$groundImage);break;
    default:die($errorMsg);
  }
  //释放内存
  if(isset($water_info)) unset($water_info);
  if(isset($water_im)) imagedestroy($water_im);
  unset($ground_info);
  imagedestroy($ground_im);
}

Second step: Find $json = new Services_JSON(); Note that there are two places, not in the alert function That, add the following code:

 /* 水印配置开始 */
  $water_mark = 1;//1为加水印, 其它为不加
  $water_pos = 9;//水印位置，10种状态【0为随机，1为顶端居左，2为顶端居中，3为顶端居右；4为中部居左，5为中部居中，6为中部居右；7为底端居左，8为底端居中，9为底端居】
  $water_img = $_SERVER['DOCUMENT_ROOT'].'/upfiles/water.gif';//水印图片,默认填写空,请将图片上传至网站根目录的upfiles下,例: water.gif
  $water_alpha = 50;//水印透明度
  $water_text = '';//水印字符串,默认填写空;
  //$water_fontfile = $_SERVER['DOCUMENT_ROOT'] .'/upfiles/fonts/arial.ttf';//文字水印使用的字体;
  if($water_mark == 1){
    imageWaterMark($file_path, $water_pos, $water_img, $water_alpha, $water_text, $water_fontfile);
  }
  /* 水印配置结束 */

After my test, it can be used normally. Another point, please pay attention to the path of the watermark image, which depends on the actual situation.

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