缩略图生成类 追忆

1. <?
2. class resizeimage  
3. {  
4. //图片类型  
5. var $type;  
6. //实际宽度  
7. var $width;  
8. //实际高度  
9. var $height;  
10. //改变后的宽度  
11. var $resize_width;  
12. //改变后的高度  
13. var $resize_height;  
14. //是否裁图  
15. var $cut;  
16. //源图象  
17. var $srcimg;  
18. //目标图象地址  
19. var $dstimg;  
20. //临时建的图象  
21. var $im;  
22. //生成的文件名后缀
23. var $extstr;
25. function resizeimage($img, $wid, $hei,$extstr,$c=0)  
26. {  
27. $this->srcimg = $img;  
28. $this->resize_width = $wid;  
29. $this->resize_height = $hei;  
30. $this->cut = $c;  
31. $this->extstr = $extstr;
32. //图片的类型  
33. $this->type = substr(strrchr($this->srcimg,"."),1);  
34. //初始化图象  
35. $this->initi_img();  
36. //目标图象地址  
37. $this -> dst_img();  
38. $this->width =@imagesx($this->im);  
39. $this->height =@imagesy($this->im);  
40. //生成图象  
41. $this->newimg();  
42. @ImageDestroy($this->im);  
43. }  
44. function newimg()  
45. {  
46. //改变后的图象的比例  
47. $resize_ratio =($this->resize_width)/($this->resize_height);  
48. //实际图象的比例  
49. if($this->height>0)
50. $ratio =($this->width)/($this->height);  
51. if(($this->cut)=="1")  
52. //裁图  
53. {  
54. if($ratio>=$resize_ratio)  
55. //高度优先  
56. {  
57. $newimg =@imagecreatetruecolor($this->resize_width,$this->resize_height);  
58. @imagecopyresampled($newimg, $this->im,0,0,0,0, $this->resize_width,$this->resize_height,(($this->height)*$resize_ratio), $this->height);  
59. @ImageJpeg($newimg,$this->dstimg);  
60. }  
61. if($ratio<$resize_ratio)  
62. //宽度优先  
63. {  
64. $newimg =@imagecreatetruecolor($this->resize_width,$this->resize_height);  
65. @imagecopyresampled($newimg, $this->im,0,0,0,0, $this->resize_width, $this->resize_height, $this->width,(($this->width)/$resize_ratio));  
66. @ImageJpeg($newimg,$this->dstimg);  
67. }  
68. }  
69. else  
70. //不裁图  
71. {  
72. if($ratio>=$resize_ratio)  
73. {  
74. $newimg =@imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio);  
75. @imagecopyresampled($newimg, $this->im,0,0,0,0, $this->resize_width,($this->resize_width)/$ratio, $this->width, $this->height);  
76. ImageJpeg($newimg,$this->dstimg);  
77. }  
78. if($ratio<$resize_ratio)  
79. {  
80. $newimg =@imagecreatetruecolor(($this->resize_height)*$ratio,$this->resize_height);  
81. @imagecopyresampled($newimg, $this->im,0,0,0,0,($this->resize_height)*$ratio, $this->resize_height, $this->width, $this->height);  
82. @ImageJpeg($newimg,$this->dstimg);  
83. }  
84. }  
85. }  
86. //初始化图象  
87. function initi_img()  
88. {  
89. $type=strtolower($this->type);//转换成小写，否则不写扩展名生成不了。
91. if($type=="jpg"|| $type=="jpeg"|| $type=="jpe")  
92. {  
93. $this->im =@imagecreatefromjpeg($this->srcimg);  
94. }  
95. if($type=="gif")  
96. {  
97. $this->im =@imagecreatefromgif($this->srcimg);  
98. }  
99. if($type=="png")  
100. {  
101. $this->im =@imagecreatefrompng($this->srcimg);  
102. }
103. if($type=="bmp")
104. {
105. $this->im = $this->imagecreatefrombmp($this->srcimg);
106. }
107. }  
109. function imagecreatefrombmp($p_sFile){
110. $file = fopen($p_sFile,"rb");
111. $read = fread($file,10);
112. while(!feof($file)&&($read<>""))
113. $read .= fread($file,1024);
114. $temp = unpack("H*",$read);
115. $hex =  $temp[1];
116. $header = substr($hex,0,108);
117. if(substr($header,0,4)=="424d"){
118. $header_parts = str_split($header,2);
119. $width = hexdec($header_parts[19].$header_parts[18]);
120. $height = hexdec($header_parts[23].$header_parts[22]);
121. unset($header_parts);
122. }
123. $x =0;
124. $y =1;
125. $image = imagecreatetruecolor($width,$height);
126. $body = substr($hex,108);
127. $body_size =(strlen($body)/2);
128. $header_size =($width*$height);
129. $usePadding =($body_size>($header_size*3)+4);
130. for($i=0;$i<$body_size;$i+=3){
131. if($x>=$width){
132. if($usePadding)
133. $i    +=    $width%4;
134. $x    =    0;
135. $y++;
136. if($y>$height)
137. break;
138. }
139. $i_pos    =    $i*2;
140. $r        =    hexdec($body[$i_pos+4].$body[$i_pos+5]);
141. $g        =    hexdec($body[$i_pos+2].$body[$i_pos+3]);
142. $b        =    hexdec($body[$i_pos].$body[$i_pos+1]);
143. $color    =    imagecolorallocate($image,$r,$g,$b);
144. imagesetpixel($image,$x,$height-$y,$color);
145. $x++;
146. }
147. unset($body);
148. return $image;
149. }
151. //图象目标地址  
152. function dst_img()  
153. {  
154. $full_length  = strlen($this->srcimg);  
155. $type_length  = strlen($this->type);  
156. $name_length  = $full_length-$type_length;  
157. $name         = substr($this->srcimg,0,$name_length-1);  
158. $this->dstimg = $name.$this->extstr.'.'.$this->type;  
159. }
161. staticfunction get_url($img,$extstr){
162. $imgs = explode('.',$img);
163. $ext =end($imgs);
164. $full_length  = strlen($img);  
165. $type_length  = strlen($ext);  
166. $name_length  = $full_length-$type_length;  
167. $name         = substr($img,0,$name_length-1);  
168. return $name.$extstr.'.'.$ext;  
169. }
170. }
171. ?>