用php实现生成缩略图的源代码
PHP代码<?php/*** 功能:生成缩略图* 作者:phpox* 日期:Thu May 17 09:57:05 CST 2007*/class CreatMiniature{//公共变量var $srcFile=""; //原图var $echoType; //输出图片类型，link--不保存为文件；file--保存为文件var $im=""; //临时变量var $srcW=""; //原图宽var $srcH=""; //原图高//设置变量及初始化function SetVar($srcFile,$echoType){if (!file_exists($srcFile)){echo '源图片文件不存在!';exit();}$this->srcFile=$srcFile;$this->echoType=$echoType;$info = "";$data = GetImageSize($this->srcFile,$info);switch ($data[2]){case 1:if(!function_exists("imagecreatefromgif")){echo "你的GD库不能使用GIF格式的图片，请使用Jpeg或PNG格式！<a href='javascript:go(-1);'>返回</a>";exit();}$this->im = ImageCreateFromGIF($this->srcFile);break;case 2:if(!function_exists("imagecreatefromjpeg")){echo "你的GD库不能使用jpeg格式的图片，请使用其它格式的图片！<a href='javascript:go(-1);'>返回</a>";exit();}$this->im = ImageCreateFromJpeg($this->srcFile);break;case 3:$this->im = ImageCreateFromPNG($this->srcFile);break;}$this->srcW=ImageSX($this->im);$this->srcH=ImageSY($this->im);}//生成扭曲型缩图function Distortion($toFile,$toW,$toH){$cImg=$this->CreatImage($this->im,$toW,$toH,0,0,0,0,$this->srcW,$this->srcH);return $this->EchoImage($cImg,$toFile);ImageDestroy($cImg);}//生成按比例缩放的缩图function Prorate($toFile,$toW,$toH){$toWH=$toW/$toH;$srcWH=$this->srcW/$this->srcH;if($toWH<=$srcWH){$ftoW=$toW;$ftoH=$ftoW*($this->srcH/$this->srcW);}else{$ftoH=$toH;$ftoW=$ftoH*($this->srcW/$this->srcH);}if($this->srcW>$toW||$this->srcH>$toH){$cImg=$this->CreatImage($this->im,$ftoW,$ftoH,0,0,0,0,$this->srcW,$this->srcH);return $this->EchoImage($cImg,$toFile);ImageDestroy($cImg);}else{$cImg=$this->CreatImage($this->im,$this->srcW,$this->srcH,0,0,0,0,$this->srcW,$this->srcH);return $this->EchoImage($cImg,$toFile);ImageDestroy($cImg);}}//生成最小裁剪后的缩图function Cut($toFile,$toW,$toH){$toWH=$toW/$toH;$srcWH=$this->srcW/$this->srcH;if($toWH<=$srcWH){$ctoH=$toH;$ctoW=$ctoH*($this->srcW/$this->srcH);}else{$ctoW=$toW;$ctoH=$ctoW*($this->srcH/$this->srcW);}$allImg=$this->CreatImage($this->im,$ctoW,$ctoH,0,0,0,0,$this->srcW,$this->srcH);$cImg=$this->CreatImage($allImg,$toW,$toH,0,0,($ctoW-$toW)/2,($ctoH-$toH)/2,$toW,$toH);return $this->EchoImage($cImg,$toFile);ImageDestroy($cImg);ImageDestroy($allImg);}//生成背景填充的缩图function BackFill($toFile,$toW,$toH,$bk1=255,$bk2=255,$bk3=255){$toWH=$toW/$toH;$srcWH=$this->srcW/$this->srcH;if($toWH<=$srcWH){$ftoW=$toW;$ftoH=$ftoW*($this->srcH/$this->srcW);}
