图片加水印、等比例缩放 类

光明使者

1. <p><?php
   
2. </p><p>class image{
   
3. </p><p>private $res; //图像资源
   
4. </p><p>private $srcpath;
   
5. private $srcwidth;
   
6. 
   
7. private $srchight;
   
8. 
   
9. private $srctype;
   
10. </p><p>private $logpath;
    
11. 
    
12. private $logwidth;
    
13. 
    
14. private $loghight;
    
15. 
    
16. private $logtype;
    
17. </p><p>//初始化得到图像信息
    
18. 
    
19. public function __construct($srcpath,$logpath){
    
20. 
    
21. //判断是否为文件
    
22. 
    
23. if(!is_file($srcpath) || !is_file($logpath)){
    
24. 
    
25. die('文件不存在');
    
26. 
    
27. }
    
28. </p><p>//获取图像地址
    
29. 
    
30. $this->srcpath = $srcpath;
    
31. 
    
32. $this->logpath = $logpath;
    
33. </p><p>//取得目标图像大小，类型1 = GIF，2 = JPG，3 = PNG 6 = BMP
    
34. 
    
35. list($sw,$sh,$stype) = getimagesize($srcpath);
    
36. 
    
37. $this->srcwidth = $sw;
    
38. 
    
39. $this->srchigth = $sh;
    
40. 
    
41. $this->srctype = $stype;
    
42. </p><p>//取得水印图像大小，类型
    
43. 
    
44. list($lw,$lh,$ltype) = getimagesize($logpath);
    
45. 
    
46. $this->logwidth = $lw;
    
47. 
    
48. $this->loghight = $lh;
    
49. 
    
50. $this->logtype = $ltype;
    
51. </p><p>}
    
52. </p><p>
    
53. /************************************创建图像资源********************************/
    
54. 
    
55. public function createimage(){
    
56. </p><p>//图像地址关联图像类型
    
57. 
    
58. $imgarr = array_combine( array($this->srcpath,$this->logpath),array($this->srctype,$this->logtype) );
    
59. $res = array();
    
60. </p><p>//创建对应类型的图像资源
    
61. 
    
62. foreach($imgarr as $key=>$v){
    
63. 
    
64. switch($v){
    
65. 
    
66. case 1:
    
67. 
    
68. $res[] = imagecreatefromgif($key);
    
69. break;
    
70. 
    
71. case 2:
    
72. 
    
73. $res[] = imagecreatefromjpeg($key);
    
74. 
    
75. break;
    
76. 
    
77. case 3:
    
78. 
    
79. $res[] = imagecreatefrompng($key);
    
80. break;
    
81. 
    
82. case 6:
    
83. 
    
84. $res[] = imagecreatefromwbmp($key);
    
85. break;
    
86. 
    
87. default:
    
88. 
    
89. return false;
    
90. 
    
91. }
    
92. 
    
93. }
    
94. </p><p>//图像资源赋给属性
    
95. 
    
96. $this->res = $res;
    
97. </p><p>}
    
98. </p><p>
    
99. /************************************给图片加水印********************************/
    
100. 
     
101. //$dx,$dy水印放置目标图片坐标
     
102. 
     
103. //$sx,$sy水印开始部分坐标
     
104. 
     
105. //$sw,$sh水印结束部分坐标
     
106. 
     
107. //$pct水印透明度(100不透明)
     
108. 
     
109. public function shuiyin($dx,$dy,$sx,$sy,$sw,$sh,$pct){
     
110. 
     
111. $dstres = $this->res[0];
     
112. 
     
113. $logres = $this->res[1]; </p><p>imagecopymergegray($dstres,$logres,$dx,$dy,$sx,$sy,$sw,$sh,$pct);
     
114. 
     
115. return $dstres;
     
116. 
     
117. }
     
118. </p><p>
     
119. /************************************等比例缩放图片********************************/
     
120. 
     
121. //$res需缩小的图片资源
     
122. 
     
123. //$width,$higth缩小尺寸
     
124. </p><p>public function small($logres,$imw,$imh){
     
125. 
     
126. $img = imagecreatetruecolor($imw,$imh); //创建画布
     
127. 
     
128. $imgcolor = imagecolorallocate($img,100,100,100);
     
129. 
     
130. imagefill($img,0,0,$imgcolor);
     
131. </p><p>//判断图像来源，取得图像大小
     
132. 
     
133. if(is_file($logres)){
     
134. 
     
135. list($width,$hight,$type) = getimagesize($logres);
     
136. switch($type){
     
137. 
     
138. case 1:
     
139. 
     
140. $src = imagecreatefromgif($logres);
     
141. break;
     
142. 
     
143. case 2:
     
144. 
     
145. $src = imagecreatefromjpeg($logres);
     
146. 
     
147. break;
     
148. 
     
149. case 3:
     
150. 
     
151. $src = imagecreatefrompng($logres);
     
152. break;
     
153. 
     
154. case 6:
     
155. 
     
156. $src = imagecreatefromwbmp($logres);
     
157. break;
     
158. 
     
159. default:
     
160. 
     
161. return false;
     
162. 
     
163. }
     
164. }
     
165. 
     
166. else{
     
167. 
     
168. $src = $logres;
     
169. 
     
170. $width = imagesx($src);
     
171. 
     
172. $hight = imagesy($src);
     
173. 
     
174. }
     
175. </p><p>//判断图像大小，进行缩放
     
176. 
     
177. if($width==$imw && $hight==$imh){
     
178. 
     
179. imagecopyresampled($img,$src,0,0,0,0,$imw,$imh,$width,$hight);
     
180. 
     
181. }
     
182. 
     
183. elseif($width>$hight){
     
184. 
     
185. $bili = $imw/$width;
     
186. 
     
187. $nw = $bili*$width;
     
188. 
     
189. $nh = $imh*($hight/$width);
     
190. 
     
191. imagecopyresampled($img,$src,0,($imh-$nh)/2,0,0,$nw,$nh,$width,$hight); //宽>高
     
192. 
     
193. }else{
     
194. 
     
195. $bili = $imh/$hight;
     
196. 
     
197. $nw = $imw*($width/$hight);
     
198. 
     
199. $nh = $bili*$hight;
     
200. 
     
201. imagecopyresampled($img,$src,($imw-$nw)/2,0,0,0,$nw,$nh,$width,$hight); //高>宽
     
202. 
     
203. }
     
204. </p><p>//返回图像资源
     
205. 
     
206. return $img;
     
207. 
     
208. }
     
209. </p><p>}
     
210. </p><p> </p>

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