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php图片水印类代码,php图片添加文字水印与图片水印

程序员文章站 2022-03-28 20:57:44
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  1. /**

  2. * 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。
  3. * 使用: (php文字水印效果)
  4. * $obj = new WaterMask($imgFileName); //实例化对象
  5. * $obj->$waterType = 1; //类型:0为文字水印、1为图片水印
  6. * $obj->$transparent = 45; //水印透明度
  7. * $obj->$waterStr = 'bbs.it-home.org'; //水印文字
  8. * $obj->$fontSize = 16; //文字字体大小
  9. * $obj->$fontColor = array(255,0255); //水印文字颜色(RGB)
  10. * $obj->$fontFile = = 'AHGBold.ttf'; //字体文件
  11. * $obj->output(); //输出水印图片文件覆盖到输入的图片文件
  12. */
  13. class WaterMask{
  14. public $waterType = 1; //水印类型:0为文字水印、1为图片水印
  15. public $pos = 0; //水印位置
  16. public $transparent = 45; //水印透明度
  17. public $waterStr = 'bbs.it-home.org'; //水印文字
  18. public $fontSize = 16; //文字字体大小
  19. public $fontColor = array(255,0,255); //水印文字颜色(RGB)
  20. public $fontFile = 'AHGBold.ttf'; //字体文件
  21. public $waterImg = 'logo.png'; //水印图片
  22. private $srcImg = ''; //需要添加水印的图片
  23. private $im = ''; //图片句柄
  24. private $water_im = ''; //水印图片句柄
  25. private $srcImg_info = ''; //图片信息
  26. private $waterImg_info = ''; //水印图片信息
  27. private $str_w = ''; //水印文字宽度
  28. private $str_h = ''; //水印文字高度
  29. private $x = ''; //水印X坐标
  30. private $y = ''; //水印y坐标
  31. function __construct($img) { //析构函数

  32. $this->srcImg = file_exists($img) ? $img : die('"'.$img.'" 源文件不存在!');
  33. }
  34. private function imginfo() { //获取需要添加水印的图片的信息,并载入图片。
  35. $this->srcImg_info = getimagesize($this->srcImg);
  36. switch ($this->srcImg_info[2]) {
  37. case 3:
  38. $this->im = imagecreatefrompng($this->srcImg);
  39. break 1;
  40. case 2:
  41. $this->im = imagecreatefromjpeg($this->srcImg);
  42. break 1;
  43. case 1:
  44. $this->im = imagecreatefromgif($this->srcImg);
  45. break 1;
  46. default:
  47. die('原图片('.$this->srcImg.')格式不对,只支持PNG、JPEG、GIF。');
  48. }
  49. }
  50. private function waterimginfo() { //获取水印图片的信息,并载入图片。
  51. $this->waterImg_info = getimagesize($this->waterImg);
  52. switch ($this->waterImg_info[2]) {
  53. case 3:
  54. $this->water_im = imagecreatefrompng($this->waterImg);
  55. break 1;
  56. case 2:
  57. $this->water_im = imagecreatefromjpeg($this->waterImg);
  58. break 1;
  59. case 1:
  60. $this->water_im = imagecreatefromgif($this->waterImg);
  61. break 1;
  62. default:
  63. die('水印图片('.$this->srcImg.')格式不对,只支持PNG、JPEG、GIF。');
  64. }
  65. }
  66. private function waterpos() { //水印位置算法
  67. switch ($this->pos) {
  68. case 0: //随机位置
  69. $this->x = rand(0,$this->srcImg_info[0]-$this->waterImg_info[0]);
  70. $this->y = rand(0,$this->srcImg_info[1]-$this->waterImg_info[1]);
  71. break 1;
  72. case 1: //上左
  73. $this->x = 0;
  74. $this->y = 0;
  75. break 1;
  76. case 2: //上中
  77. $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
  78. $this->y = 0;
  79. break 1;
  80. case 3: //上右
  81. $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
  82. $this->y = 0;
  83. break 1;
  84. case 4: //中左
  85. $this->x = 0;
  86. $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
  87. break 1;
  88. case 5: //中中
  89. $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
  90. $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
  91. break 1;
  92. case 6: //中右
  93. $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
  94. $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
  95. break 1;
  96. case 7: //下左
  97. $this->x = 0;
  98. $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
  99. break 1;
  100. case 8: //下中
  101. $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
  102. $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
  103. break 1;
  104. default: //下右
  105. $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
  106. $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
  107. break 1;
  108. }
  109. }
  110. private function waterimg() {
  111. if ($this->srcImg_info[0] waterImg_info[0] || $this->srcImg_info[1] waterImg_info[1]){
  112. die('水印比原图大!');
  113. }
  114. $this->waterpos();
  115. $cut = imagecreatetruecolor($this->waterImg_info[0],$this->waterImg_info[1]);
  116. imagecopy($cut,$this->im,0,0,$this->x,$this->y,$this->waterImg_info[0],$this->waterImg_info[1]);
  117. $pct = $this->transparent;
  118. imagecopy($cut,$this->water_im,0,0,0,0,$this->waterImg_info[0],$this->waterImg_info[1]);
  119. imagecopymerge($this->im,$cut,$this->x,$this->y,0,0,$this->waterImg_info[0],$this->waterImg_info[1],$pct);
  120. }
  121. private function waterstr() {
  122. $rect = imagettfbbox($this->fontSize,0,$this->fontFile,$this->waterStr);
  123. $w = abs($rect[2]-$rect[6]);
  124. $h = abs($rect[3]-$rect[7]);
  125. $fontHeight = $this->fontSize;
  126. $this->water_im = imagecreatetruecolor($w, $h);
  127. imagealphablending($this->water_im,false);
  128. imagesavealpha($this->water_im,true);
  129. $white_alpha = imagecolorallocatealpha($this->water_im,255,255,255,127);
  130. imagefill($this->water_im,0,0,$white_alpha);
  131. $color = imagecolorallocate($this->water_im,$this->fontColor[0],$this->fontColor[1],$this->fontColor[2]);
  132. imagettftext($this->water_im,$this->fontSize,0,0,$this->fontSize,$color,$this->fontFile,$this->waterStr);
  133. $this->waterImg_info = array(0=>$w,1=>$h);
  134. $this->waterimg();
  135. }
  136. function output() {
  137. $this->imginfo();
  138. if ($this->waterType == 0) {
  139. $this->waterstr();
  140. }else {
  141. $this->waterimginfo();
  142. $this->waterimg();
  143. }
  144. switch ($this->srcImg_info[2]) {
  145. case 3:
  146. imagepng($this->im,$this->srcImg);
  147. break 1;
  148. case 2:
  149. imagejpeg($this->im,$this->srcImg);
  150. break 1;
  151. case 1:
  152. imagegif($this->im,$this->srcImg);
  153. break 1;
  154. default:
  155. die('添加水印失败!');
  156. break;
  157. }
  158. imagedestroy($this->im);
  159. imagedestroy($this->water_im);
  160. }
  161. }
  162. ?>
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