1 <?php
2 /**
3 * 功能:生成缩略图
4 * 作者:phpox
5 * 日期:Thu May 17 09:57:05 CST 2007
6 */
7 class CreatThumImage {
8 //公共变量
9 var $srcFile = ""; //原图
10 var $echoType; //输出图片类型，link--不保存为文件；file--保存为文件
11 var $im = ""; //临时变量
12 var $srcW = ""; //原图宽
13 var $srcH = ""; //原图高
14
15 //设置变量及初始化
16 function SetVar($srcFile,$echoType) {
17 if (!file_exists($srcFile)) {
18 echo '源图片文件不存在!';
19 exit();
20 }
21 $this->srcFile=$srcFile;
22 $this->echoType=$echoType;
23
24 $info = "";
25
26 $data = GetImageSize($this->srcFile,$info);
27
28 switch ($data[2]) {
29 case 1:
30 if(!function_exists("imagecreatefromgif")){
31 echo "你的GD库不能使用GIF格式的图片，请使用Jpeg或PNG格式！<a href='javascript:go(-1);'>返回</a>";
32 exit();
33 }
34 $this->im = ImageCreateFromGIF($this->srcFile);
35 break;
36 case 2:
37 if(!function_exists("imagecreatefromjpeg")){
38 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！<a href='Javascript:go(-1);'>返回</a>";
39 exit();
40 }
41 $this->im = ImageCreateFromJpeg($this->srcFile);
42 break;
43 case 3:
44 $this->im = ImageCreateFromPNG($this->srcFile);
45 break;
46 }
47
48 $this->srcW=ImageSX($this->im);
49
50 $this->srcH=ImageSY($this->im);
51
52 }
53
54
55 //生成扭曲型缩图
56 function Distortion($toFile,$toW,$toH) {
57
58 $cImg=$this->CreatImage($this->im,$toW,$toH,0,0,0,0,$this->srcW,$this->srcH);
59
60 return $this->EchoImage($cImg,$toFile);
61
62 ImageDestroy($cImg);
63
64 }
65
66
67
68 //生成按比例缩放的缩图
69
70 function PRorate($toFile,$toW,$toH) {
71
72 $toWH=$toW/$toH;
73
74 $srcWH=$this->srcW/$this->srcH;
75
76 if($toWH<=$srcWH) {
77
78 $ftoW=$toW;
79
80 $ftoH=$ftoW*($this->srcH/$this->srcW);
81
82 } else {
83
84 $ftoH=$toH;
85
86 $ftoW=$ftoH*($this->srcW/$this->srcH);
87
88 }
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
94 return $this->EchoImage($cImg,$toFile);
95
96 ImageDestroy($cImg);
97
98 } else {
99
100 $cImg=$this->CreatImage($this->im,$this->srcW,$this->srcH,0,0,0,0,$this->srcW,$this->srcH);
101
102 return $this->EchoImage($cImg,$toFile);
103
104 ImageDestroy($cImg);
105
106 }
107
108 }
109
110
111
112 //生成最小裁剪后的缩图
113
114 function Cut($toFile,$toW,$toH) {
115
116 $toWH=$toW/$toH;
117
118 $srcWH=$this->srcW/$this->srcH;
119
120 if($toWH<=$srcWH) {
121
122 $ctoH=$toH;
123
124 $ctoW=$ctoH*($this->srcW/$this->srcH);
125
126 } else {
127
128 $ctoW=$toW;
129
130 $ctoH=$ctoW*($this->srcH/$this->srcW);
131
132 }
133
134 $allImg=$this->CreatImage($this->im,$ctoW,$ctoH,0,0,0,0,$this->srcW,$this->srcH);
135
136 $cImg=$this->CreatImage($allImg,$toW,$toH,0,0,($ctoW-$toW)/2,($ctoH-$toH)/2,$toW,$toH);
137
138 return $this->EchoImage($cImg,$toFile);
139
140 ImageDestroy($cImg);
141
142 ImageDestroy($allImg);
143
144 }
145
146
147
148 //生成背景填充的缩图
149
150 function BackFill($toFile,$toW,$toH,$bk1=255,$bk2=255,$bk3=255) {
151
152 $toWH=$toW/$toH;
153
154 $srcWH=$this->srcW/$this->srcH;
155
156 if($toWH<=$srcWH) {
157
158 $ftoW=$toW;
159
160 $ftoH=$ftoW*($this->srcH/$this->srcW);
161
162 } else {
163
164 $ftoH=$toH;
165
166 $ftoW=$ftoH*($this->srcW/$this->srcH);
167
168 }
169
170 if(function_exists("imagecreatetruecolor")) {
171
172 @$cImg=ImageCreateTrueColor($toW,$toH);
173
174 if(!$cImg) {
175
176 $cImg=ImageCreate($toW,$toH);
177
178 }
179
180 } else {
181
182 $cImg=ImageCreate($toW,$toH);
183
184 }
185
186 $backcolor = imagecolorallocate($cImg, $bk1, $bk2, $bk3); //填充的背景颜色
187
188 ImageFilledRectangle($cImg,0,0,$toW,$toH,$backcolor);
189
190 if($this->srcW>$toW||$this->srcH>$toH) {
191
192 $proImg=$this->CreatImage($this->im,$ftoW,$ftoH,0,0,0,0,$this->srcW,$this->srcH);
193
194 if($ftoW<$toW) {
195
196 ImageCopy($cImg,$proImg,($toW-$ftoW)/2,0,0,0,$ftoW,$ftoH);
197
198 } else if($ftoH<$toH) {
199
200 ImageCopy($cImg,$proImg,0,($toH-$ftoH)/2,0,0,$ftoW,$ftoH);
201
202 } else {
203
204 ImageCopy($cImg,$proImg,0,0,0,0,$ftoW,$ftoH);
205
206 }
207
208 } else {
209
210 ImageCopyMerge($cImg,$this->im,($toW-$ftoW)/2,($toH-$ftoH)/2,0,0,$ftoW,$ftoH,100);
211
212 }
213
214 return $this->EchoImage($cImg,$toFile);
215
216 ImageDestroy($cImg);
217
218 }
219
220
221
222
223
224 function CreatImage($img,$creatW,$creatH,$dstX,$dstY,$srcX,$srcY,$srcImgW,$srcImgH) {
225
226 if(function_exists("imagecreatetruecolor")) {
227
228 @$creatImg = ImageCreateTrueColor($creatW,$creatH);
229
230 if($creatImg) {
231
232 ImageCopyResampled($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);
233
234 } else {
235
236 $creatImg=ImageCreate($creatW,$creatH);
237
238 ImageCopyResized($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);
239
240 }
241
242 } else {
243
244 $creatImg=ImageCreate($creatW,$creatH);
245
246 ImageCopyResized($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH);
247
248 }
249
250 return $creatImg;
251
252 }
253
254
255
256 //输出图片，link---只输出，不保存文件。file--保存为文件
257
258 function EchoImage($img,$to_File) {
259
260 switch($this->echoType) {
261
262 case "link":
263
264 if(function_exists('imagejpeg')) return ImageJpeg($img);
265
266 else return ImagePNG($img);
267
268 break;
269
270 case "file":
271
272 if(function_exists('imagejpeg')) return ImageJpeg($img,$to_File);
273
274 else return ImagePNG($img,$to_File);
275
276 break;
277
278 }
279
280 }
281
282 }
