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. /**
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. * 日期：2011-09-27
4. * 作者：www.itwhy.org
5. * 使用：
6. * $obj = new WaterMask($imgFileName); //实例化对象
7. * $obj->$waterType = 1; //类型：0为文字水印、1为图片水印
8. * $obj->$transparent = 45; //水印透明度
9. * $obj->$waterStr = 'www.itwhy.org'; //水印文字
10. * $obj->$fontSize = 16; //文字字体大小
11. * $obj->$fontColor = array(255,0255); //水印文字颜色（RGB）
12. * $obj->$fontFile = = 'AHGBold.ttf'; //字体文件
13. * $obj->output(); //输出水印图片文件覆盖到输入的图片文件
14. */
15. class WaterMask{
16. public $waterType = 1; //水印类型：0为文字水印、1为图片水印
17. public $pos = 0; //水印位置
18. public $transparent = 45; //水印透明度
20. public $waterStr = 'www.itwhy.org'; //水印文字
21. public $fontSize = 16; //文字字体大小
22. public $fontColor = array(255,0,255); //水印文字颜色（RGB）
23. public $fontFile = 'AHGBold.ttf'; //字体文件
25. public $waterImg = 'logo.png'; //水印图片
27. private $srcImg = ''; //需要添加水印的图片
28. private $im = ''; //图片句柄
29. private $water_im = ''; //水印图片句柄
30. private $srcImg_info = ''; //图片信息
31. private $waterImg_info = ''; //水印图片信息
32. private $str_w = ''; //水印文字宽度
33. private $str_h = ''; //水印文字高度
34. private $x = ''; //水印X坐标
35. private $y = ''; //水印y坐标
37. function __construct($img) { //析构函数
38. $this->srcImg = file_exists($img) ? $img : die('"'.$img.'" 源文件不存在！');
39. }
40. private function imginfo() { //获取需要添加水印的图片的信息，并载入图片。
41. $this->srcImg_info = getimagesize($this->srcImg);
42. switch ($this->srcImg_info[2]) {
43. case 3:
44. $this->im = imagecreatefrompng($this->srcImg);
45. break 1;
46. case 2:
47. $this->im = imagecreatefromjpeg($this->srcImg);
48. break 1;
49. case 1:
50. $this->im = imagecreatefromgif($this->srcImg);
51. break 1;
52. default:
53. die('原图片（'.$this->srcImg.'）格式不对，只支持PNG、JPEG、GIF。');
54. }
55. }
56. private function waterimginfo() { //获取水印图片的信息，并载入图片。
57. $this->waterImg_info = getimagesize($this->waterImg);
58. switch ($this->waterImg_info[2]) {
59. case 3:
60. $this->water_im = imagecreatefrompng($this->waterImg);
61. break 1;
62. case 2:
63. $this->water_im = imagecreatefromjpeg($this->waterImg);
64. break 1;
65. case 1:
66. $this->water_im = imagecreatefromgif($this->waterImg);
67. break 1;
68. default:
69. die('水印图片（'.$this->srcImg.'）格式不对，只支持PNG、JPEG、GIF。');
70. }
71. }
72. private function waterpos() { //水印位置算法
73. switch ($this->pos) {
74. case 0: //随机位置
75. $this->x = rand(0,$this->srcImg_info[0]-$this->waterImg_info[0]);
76. $this->y = rand(0,$this->srcImg_info[1]-$this->waterImg_info[1]);
77. break 1;
78. case 1: //上左
79. $this->x = 0;
80. $this->y = 0;
81. break 1;
82. case 2: //上中
83. $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
84. $this->y = 0;
85. break 1;
86. case 3: //上右
87. $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
88. $this->y = 0;
89. break 1;
90. case 4: //中左
91. $this->x = 0;
92. $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
93. break 1;
94. case 5: //中中
95. $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
96. $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
97. break 1;
98. case 6: //中右
99. $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
100. $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;
101. break 1;
102. case 7: //下左
103. $this->x = 0;
104. $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
105. break 1;
106. case 8: //下中
107. $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;
108. $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
109. break 1;
110. default: //下右
111. $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];
112. $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];
113. break 1;
114. }
115. }
116. private function waterimg() {
117. if ($this->srcImg_info[0] waterImg_info[0] || $this->srcImg_info[1] waterImg_info[1]){
118. die('水印比原图大！');
119. }
120. $this->waterpos();
121. $cut = imagecreatetruecolor($this->waterImg_info[0],$this->waterImg_info[1]);
122. imagecopy($cut,$this->im,0,0,$this->x,$this->y,$this->waterImg_info[0],$this->waterImg_info[1]);
123. $pct = $this->transparent;
124. imagecopy($cut,$this->water_im,0,0,0,0,$this->waterImg_info[0],$this->waterImg_info[1]);
125. imagecopymerge($this->im,$cut,$this->x,$this->y,0,0,$this->waterImg_info[0],$this->waterImg_info[1],$pct);
126. }
127. private function waterstr() {
128. $rect = imagettfbbox($this->fontSize,0,$this->fontFile,$this->waterStr);
129. $w = abs($rect[2]-$rect[6]);
130. $h = abs($rect[3]-$rect[7]);
131. $fontHeight = $this->fontSize;
132. $this->water_im = imagecreatetruecolor($w, $h);
133. imagealphablending($this->water_im,false);
134. imagesavealpha($this->water_im,true);
135. $white_alpha = imagecolorallocatealpha($this->water_im,255,255,255,127);
136. imagefill($this->water_im,0,0,$white_alpha);
137. $color = imagecolorallocate($this->water_im,$this->fontColor[0],$this->fontColor[1],$this->fontColor[2]);
138. imagettftext($this->water_im,$this->fontSize,0,0,$this->fontSize,$color,$this->fontFile,$this->waterStr);
139. $this->waterImg_info = array(0=>$w,1=>$h);
140. $this->waterimg();
141. }
142. function output() {
143. $this->imginfo();
144. if ($this->waterType == 0) {
145. $this->waterstr();
146. }else {
147. $this->waterimginfo();
148. $this->waterimg();
149. }
150. switch ($this->srcImg_info[2]) {
151. case 3:
152. imagepng($this->im,$this->srcImg);
153. break 1;
154. case 2:
155. imagejpeg($this->im,$this->srcImg);
156. break 1;
157. case 1:
158. imagegif($this->im,$this->srcImg);
159. break 1;
160. default:
161. die('添加水印失败！');
162. break;
163. }
164. imagedestroy($this->im);
165. imagedestroy($this->water_im);
166. }
167. }
168. ?>

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