PHP生成縮略圖的類的方法
PHP獨特的語法混合了C、Java、Perl以及PHP自創的語法。它可以比CGI或者Perl更快速地執行動態網頁。用PHP做出的動態頁面與其他的編程語言相比，PHP是將程序嵌入到HTML文檔中去執行，執行效率比完全生成HTML標記的CGI要高許多;PHP還可以執行編譯后代碼，編譯可以達到加密和優化代碼運行，使代碼運行更快。以下是小編為大家搜索整理的PHP生成縮略圖的類的方法 ，歡迎閱讀!更多精彩內容請及時關注我們應屆畢業生考試網!
PHP代碼
/**
* 功能:生成縮略圖
* 作者:phpox
* 日期:Thu May 17 09:57:05 CST 2007
*/
class CreatMiniature
{
//公共變量
var $srcFile=""; //原圖
var $echoType; //輸出圖片類型，link--不保存為文件;file--保存為文件
var $im=""; //臨時變量
var $srcW=""; //原圖寬
var $srcH=""; //原圖高
//設置變量及初始化
function SetVar($srcFile,$echoType)
{
if (!file_exists($srcFile)){
echo '源圖片文件不存在!';
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庫不能使用GIF格式的圖片，請使用Jpeg或PNG格式!返回";
exit();
}
$this->im = ImageCreateFromGIF($this->srcFile);
break;
case 2:
if(!function_exists("imagecreatefromjpeg")){
echo "你的GD庫不能使用jpeg格式的圖片，請使用其它格式的圖片!;
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);
}
//生成扭曲型縮圖
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);
}
//生成按比例縮放的縮圖
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);
}
}
//生成最小裁剪后的縮圖
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($allImg);
}
//生成背景填充的縮圖
function BackFill($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);
}
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