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给图片添加水印的PHP类

支持文字水印、图片水印支持水印的位置随机或固定（九宫格）水印透明度设置（图片水印和文字水印都支持）文字 水印的字体、颜色、大小设置图片水印的背景透明
  1. * 加水印类，支持文字图片水印的透明度设置、水印图片背景透明。
  2. * 日期：2011-09-27
  3. * 作者：www.itwhy.org
  4. * 使用：
  5. * $obj = new WaterMask($imgFileName); //实例化对象
  6. * $obj->$waterType = 1; //类型：0为文字水印、1为图片水印
  7. * $obj->$transparent = 45; //水印透明度
  8. * $obj->$waterStr = 'www.itwhy.org'; //水印文字
  9. * $obj->$fontSize = 16; //文字字体大小
  10. * $obj->$fontColor = array(255,0255); //水印文字颜色（RGB）
  11. * $obj->$fontFile = = 'AHGBold.ttf'; //字体文件
  12. * $obj->output(); //输出水印图片文件覆盖到输入的图片文件
  13. */
  14. class WaterMask{
  15. public $waterType = 1; //水印类型：0为文字水印、1为图片水印
  16. public $pos = 0; //水印位置
  17. public $transparent = 45; //水印透明度
  19. public $waterStr = 'www.itwhy.org'; //水印文字
  20. public $fontSize = 16; //文字字体大小
  21. public $fontColor = array(255,0,255); //水印文字颜色（RGB）
  22. public $fontFile = 'AHGBold.ttf'; //字体文件
  24. public $waterImg = 'logo.png'; //水印图片
  26. private $srcImg = ''; //需要添加水印的图片
  27. private $im = ''; //图片句柄
  28. private $water_im = ''; //水印图片句柄
  29. private $srcImg_info = ''; //图片信息
  30. private $waterImg_info = ''; //水印图片信息
  31. private $str_w = ''; //水印文字宽度
  32. private $str_h = ''; //水印文字高度
  33. private $x = ''; //水印X坐标
  34. private $y = ''; //水印y坐标
  36. function __construct($img) { //析构函数
  37. $this->srcImg = file_exists($img) ? $img : die('"'.$img.'" 源文件不存在！');
  38. }
  39. private function imginfo() { //获取需要添加水印的图片的信息，并载入图片。
  40. $this->srcImg_info = getimagesize($this->srcImg);
  41. switch ($this->srcImg_info[2]) {
  42. case 3:
  43. $this->im = imagecreatefrompng($this->srcImg);
  44. break 1;
  45. case 2:
  46. $this->im = imagecreatefromjpeg($this->srcImg);
  47. break 1;
  48. case 1:
  49. $this->im = imagecreatefromgif($this->srcImg);
  50. break 1;
  51. default:
  52. die('原图片（'.$this->srcImg.'）格式不对，只支持PNG、JPEG、GIF。');
  53. }
  54. }
  55. private function waterimginfo() { //获取水印图片的信息，并载入图片。
  56. $this->waterImg_info = getimagesize($this->waterImg);
  57. switch ($this->waterImg_info[2]) {
  58. case 3:
  59. $this->water_im = imagecreatefrompng($this->waterImg);
  60. break 1;
  61. case 2:
  62. $this->water_im = imagecreatefromjpeg($this->waterImg);
  63. break 1;
  64. case 1:
  65. $this->water_im = imagecreatefromgif($this->waterImg);
  66. break 1;
  67. default:
  68. die('水印图片（'.$this->srcImg.'）格式不对，只支持PNG、JPEG、GIF。');
  69. }
  70. }
  71. private function waterpos() { //水印位置算法
  72. switch ($this->pos) {
  73. case 0: //随机位置
  74. $this->x = rand(0,$this->srcImg_info[0]-$this->waterImg_info[0]);
  75. $this->y = rand(0,$this->srcImg_info[1]-$this->waterImg_info[1]);
  76. break 1;
  77. case 1: //上左
  78. $this->x = 0;
  79. $this->y = 0;
  80. break 1;
  81. case 2: //上中
  82. $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
  83. $this->y = 0;
  84. break 1;
  85. case 3: //上右
  86. $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
  87. $this->y = 0;
  88. break 1;
  89. case 4: //中左
  90. $this->x = 0;
  91. $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
  92. break 1;
  93. case 5: //中中
  94. $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
  95. $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
  96. break 1;
  97. case 6: //中右
  98. $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
  99. $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
  100. break 1;
  101. case 7: //下左
  102. $this->x = 0;
  103. $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
  104. break 1;
  105. case 8: //下中
  106. $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
  107. $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
  108. break 1;
  109. default: //下右
  110. $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
  111. $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
  112. break 1;
  113. }
  114. }
  115. private function waterimg() {
  116. if ($this->srcImg_info[0] waterImg_info[0] || $this->srcImg_info[1] waterImg_info[1]){
  117. die('水印比原图大！');
  118. }
  119. $this->waterpos();
  120. $cut = imagecreatetruecolor($this->waterImg_info[0],$this->waterImg_info[1]);
  121. imagecopy($cut,$this->im,0,0,$this->x,$this->y,$this->waterImg_info[0],$this->waterImg_info[1]);
  122. $pct = $this->transparent;
  123. imagecopy($cut,$this->water_im,0,0,0,0,$this->waterImg_info[0],$this->waterImg_info[1]);
  124. imagecopymerge($this->im,$cut,$this->x,$this->y,0,0,$this->waterImg_info[0],$this->waterImg_info[1],$pct);
  125. }
  126. private function waterstr() {
  127. $rect = imagettfbbox($this->fontSize,0,$this->fontFile,$this->waterStr);
  128. $w = abs($rect[2]-$rect[6]);
  129. $h = abs($rect[3]-$rect[7]);
  130. $fontHeight = $this->fontSize;
  131. $this->water_im = imagecreatetruecolor($w, $h);
  132. imagealphablending($this->water_im,false);
  133. imagesavealpha($this->water_im,true);
  134. $white_alpha = imagecolorallocatealpha($this->water_im,255,255,255,127);
  135. imagefill($this->water_im,0,0,$white_alpha);
  136. $color = imagecolorallocate($this->water_im,$this->fontColor[0],$this->fontColor[1],$this->fontColor[2]);
  137. imagettftext($this->water_im,$this->fontSize,0,0,$this->fontSize,$color,$this->fontFile,$this->waterStr);
  138. $this->waterImg_info = array(0=>$w,1=>$h);
  139. $this->waterimg();
  140. }
  141. function output() {
  142. $this->imginfo();
  143. if ($this->waterType == 0) {
  144. $this->waterstr();
  145. }else {
  146. $this->waterimginfo();
  147. $this->waterimg();
  148. }
  149. switch ($this->srcImg_info[2]) {
  150. case 3:
  151. imagepng($this->im,$this->srcImg);
  152. break 1;
  153. case 2:
  154. imagejpeg($this->im,$this->srcImg);
  155. break 1;
  156. case 1:
  157. imagegif($this->im,$this->srcImg);
  158. break 1;
  159. default:
  160. die('添加水印失败！');
  161. break;
  162. }
  163. imagedestroy($this->im);
  164. imagedestroy($this->water_im);
  165. }
  166. }
  167. ?>
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09-14 21:16
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