php生成图片缩略图代码类
生成多种类型的缩略图
<?php /*************************************** *作者：落梦天蝎（beluckly） *完成时间：2006-12-18 *类名：CreatMiniature *功能：生成多种类型的缩略图 *基本参数：$srcFile,$echoType *方法用到的参数： $toFile,生成的文件 $toW,生成的宽 $toH,生成的高 $bk1,背景颜色参数 以255为最高 $bk2,背景颜色参数 $bk3,背景颜色参数 *例子： include("thumb.php"); $cm=new CreatMiniature(); $cm->SetVar("1.jpg","file"); $cm->Distortion("dis_bei.jpg",150,200); $cm->Prorate("pro_bei.jpg",150,200); $cm->Cut("cut_bei.jpg",150,200); $cm->BackFill("fill_bei.jpg",150,200); ***************************************/ 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) { $this->srcFile=$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); } else { $ftoH=$toH; $ftoW=$ftoH*($this->srcW/$this->srcH); } if(function_exists("imagecreatetruecolor")) { @$cImg=ImageCreateTrueColor($toW,$toH); if(!$cImg) { $cImg=ImageCreate($toW,$toH); } } else { $cImg=ImageCreate($toW,$toH); } $backcolor = imagecolorallocate($cImg, $bk1, $bk2, $bk3); //填充的背景颜色 ImageFilledRectangle($cImg,0,0,$toW,$toH,$backcolor); if($this->srcW>$toW||$this->srcH>$toH) { $proImg=$this->CreatImage($this->im,$ftoW,$ftoH,0,0,0,0,$this->srcW,$this->srcH); /* if($ftoW< $toW) { ImageCopyMerge($cImg,$proImg,($toW-$ftoW)/2,0,0,0,$ftoW,$ftoH,100); } else if($ftoH<$toH) { ImageCopyMerge($cImg,$proImg,0,($toH-$ftoH)/2,0,0,$ftoW,$ftoH,100); } */ if($ftoW<$toW) { ImageCopy($cImg,$proImg,($toW-$ftoW)/2,0,0,0,$ftoW,$ftoH); } else if($ftoH<$toH) { ImageCopy($cImg,$proImg,0,($toH-$ftoH)/2,0,0,$ftoW,$ftoH); } else { ImageCopy($cImg,$proImg,0,0,0,0,$ftoW,$ftoH); } } else { ImageCopyMerge($cImg,$this->im,($toW-$ftoW)/2,($toH-$ftoH)/2,0,0,$ftoW,$ftoH,100); } return $this->EchoImage($cImg,$toFile); ImageDestroy($cImg); } function CreatImage($img,$creatW,$creatH,$dstX,$dstY,$srcX,$srcY,$srcImgW,$srcImgH) { if(function_exists("imagecreatetruecolor")) { @$creatImg = ImageCreateTrueColor($creatW,$creatH); if($creatImg) ImageCopyResampled($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH); else { $creatImg=ImageCreate($creatW,$creatH); ImageCopyResized($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH); } } else { $creatImg=ImageCreate($creatW,$creatH); ImageCopyResized($creatImg,$img,$dstX,$dstY,$srcX,$srcY,$creatW,$creatH,$srcImgW,$srcImgH); } return $creatImg; } //输出图片，link---只输出，不保存文件。file--保存为文件 function EchoImage($img,$to_File) { switch($this->echoType) { case "link": if(function_exists('imagejpeg')) return ImageJpeg($img); else return ImagePNG($img); break; case "file": if(function_exists('imagejpeg')) return ImageJpeg($img,$to_File); else return ImagePNG($img,$to_File); break; } } } ?>