php生成图片缩略图代码类

生成多种类型的缩略图

1. /***************************************
2. *作者：落梦天蝎（beluckly）
3. *完成时间：2006-12-18
4. *类名：CreatMiniature
5. *功能：生成多种类型的缩略图
6. *基本参数：$srcFile,$echoType
7. *方法用到的参数：
8. $toFile,生成的文件
9. $toW,生成的宽
10. $toH,生成的高
11. $bk1,背景颜色参数 以255为最高
12. $bk2,背景颜色参数
13. $bk3,背景颜色参数
15. *例子：
17. include("thumb.php");
18. $cm=new CreatMiniature();
19. $cm->SetVar("1.jpg","file");
20. $cm->Distortion("dis_bei.jpg",150,200);
21. $cm->Prorate("pro_bei.jpg",150,200);
22. $cm->Cut("cut_bei.jpg",150,200);
23. $cm->BackFill("fill_bei.jpg",150,200);
25. ***************************************/
27. class CreatMiniature
28. {
29. //公共变量
30. var $srcFile=""; //原图
31. var $echoType; //输出图片类型，link--不保存为文件；file--保存为文件
32. var $im=""; //临时变量
33. var $srcW=""; //原图宽
34. var $srcH=""; //原图高
36. //设置变量及初始化
37. function SetVar($srcFile,$echoType)
38. {
39. $this->srcFile=$srcFile;
40. $this->echoType=$echoType;
42. $info = "";
43. $data = GetImageSize($this->srcFile,$info);
44. switch ($data[2])
45. {
46. case 1:
47. if(!function_exists("imagecreatefromgif")){
48. echo "你的GD库不能使用GIF格式的图片，请使用Jpeg或PNG格式！返回";
49. exit();
50. }
51. $this->im = ImageCreateFromGIF($this->srcFile);
52. break;
53. case 2:
54. if(!function_exists("imagecreatefromjpeg")){
55. echo "你的GD库不能使用jpeg格式的图片，请使用其它格式的图片！返回";
56. exit();
57. }
58. $this->im = ImageCreateFromJpeg($this->srcFile);
59. break;
60. case 3:
61. $this->im = ImageCreateFromPNG($this->srcFile);
62. break;
63. }
64. $this->srcW=ImageSX($this->im);
65. $this->srcH=ImageSY($this->im);
66. }
68. //生成扭曲型缩图
69. function Distortion($toFile,$toW,$toH)
70. {
71. $cImg=$this->CreatImage($this->im,$toW,$toH,0,0,0,0,$this->srcW,$this->srcH);
72. return $this->EchoImage($cImg,$toFile);
73. ImageDestroy($cImg);
74. }
76. //生成按比例缩放的缩图
77. function Prorate($toFile,$toW,$toH)
78. {
79. $toWH=$toW/$toH;
80. $srcWH=$this->srcW/$this->srcH;
81. if($toWH {
82. $ftoW=$toW;
83. $ftoH=$ftoW*($this->srcH/$this->srcW);
84. }
85. else
86. {
87. $ftoH=$toH;
88. $ftoW=$ftoH*($this->srcW/$this->srcH);
89. }
90. if($this->srcW>$toW||$this->srcH>$toH)
91. {
92. $cImg=$this->CreatImage($this->im,$ftoW,$ftoH,0,0,0,0,$this->srcW,$this->srcH);
93. return $this->EchoImage($cImg,$toFile);
94. ImageDestroy($cImg);
95. }
96. else
97. {
98. $cImg=$this->CreatImage($this->im,$this->srcW,$this->srcH,0,0,0,0,$this->srcW,$this->srcH);
99. return $this->EchoImage($cImg,$toFile);
100. ImageDestroy($cImg);
101. }
102. }
104. //生成最小裁剪后的缩图
105. function Cut($toFile,$toW,$toH)
106. {
107. $toWH=$toW/$toH;
108. $srcWH=$this->srcW/$this->srcH;
109. if($toWH {
110. $ctoH=$toH;
111. $ctoW=$ctoH*($this->srcW/$this->srcH);
112. }
113. else
114. {
115. $ctoW=$toW;
116. $ctoH=$ctoW*($this->srcH/$this->srcW);
117. }
118. $allImg=$this->CreatImage($this->im,$ctoW,$ctoH,0,0,0,0,$this->srcW,$this->srcH);
119. $cImg=$this->CreatImage($allImg,$toW,$toH,0,0,($ctoW-$toW)/2,($ctoH-$toH)/2,$toW,$toH);
120. return $this->EchoImage($cImg,$toFile);
121. ImageDestroy($cImg);
122. ImageDestroy($allImg);
123. }
125. //生成背景填充的缩图
126. function BackFill($toFile,$toW,$toH,$bk1=255,$bk2=255,$bk3=255)
127. {
128. $toWH=$toW/$toH;
129. $srcWH=$this->srcW/$this->srcH;
130. if($toWH {
131. $ftoW=$toW;
132. $ftoH=$ftoW*($this->srcH/$this->srcW);
133. }
134. else
135. {
136. $ftoH=$toH;
137. $ftoW=$ftoH*($this->srcW/$this->srcH);
138. }
139. if(function_exists("imagecreatetruecolor"))
140. {
141. @$cImg=ImageCreateTrueColor($toW,$toH);
142. if(!$cImg)
143. {
144. $cImg=ImageCreate($toW,$toH);
145. }
146. }
147. else
148. {
149. $cImg=ImageCreate($toW,$toH);
150. }
151. $backcolor = imagecolorallocate($cImg, $bk1, $bk2, $bk3); //填充的背景颜色
152. ImageFilledRectangle($cImg,0,0,$toW,$toH,$backcolor);
153. if($this->srcW>$toW||$this->srcH>$toH)
154. {
155. $proImg=$this->CreatImage($this->im,$ftoW,$ftoH,0,0,0,0,$this->srcW,$this->srcH);
156. /*
157. if($ftoW {
158. ImageCopyMerge($cImg,$proImg,($toW-$ftoW)/2,0,0,0,$ftoW,$ftoH,100);
159. }
160. else if($ftoH {
161. ImageCopyMerge($cImg,$proImg,0,($toH-$ftoH)/2,0,0,$ftoW,$ftoH,100);
162. }
163. */
164. if($ftoW {
165. ImageCopy($cImg,$proImg,($toW-$ftoW)/2,0,0,0,$ftoW,$ftoH);
166. }
167. else if($ftoH {
168. ImageCopy($cImg,$proImg,0,($toH-$ftoH)/2,0,0,$ftoW,$ftoH);
169. }
170. else
171. {
172. ImageCopy($cImg,$proImg,0,0,0,0,$ftoW,$ftoH);
173. }
174. }
175. else
176. {
177. ImageCopyMerge($cImg,$this->im,($toW-$ftoW)/2,($toH-$ftoH)/2,0,0,$ftoW,$ftoH,100);
178. }
179. return $this->EchoImage($cImg,$toFile);
180. ImageDestroy($cImg);
181. }
183. function CreatImage($img,$creatW,$creatH,$dstX,$dstY,$srcX,$srcY,$srcImgW,$srcImgH)
184. {
185. if(function_exists("imagecreatetruecolor"))
186. {
187. @$creatImg = ImageCreateTrueColor($creatW,$creatH);
188. if($creatImg)
189. ImageCopyResampled($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);
190. else
191. {
192. $creatImg=ImageCreate($creatW,$creatH);
193. ImageCopyResized($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);
194. }
195. }
196. else
197. {
198. $creatImg=ImageCreate($creatW,$creatH);
199. ImageCopyResized($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);
200. }
201. return $creatImg;
202. }
204. //输出图片，link---只输出，不保存文件。file--保存为文件
205. function EchoImage($img,$to_File)
206. {
207. switch($this->echoType)
208. {
209. case "link":
210. if(function_exists('imagejpeg')) return ImageJpeg($img);
211. else return ImagePNG($img);
212. break;
213. case "file":
214. if(function_exists('imagejpeg')) return ImageJpeg($img,$to_File);
215. else return ImagePNG($img,$to_File);
216. break;
217. }
218. }
220. }
221. ?>

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