智能的php缩略图生成程序
这是一个可以自动检测你图片大小并生成等比例的缩略图效果，有需要的朋友可以参考一下下哦。
*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
$bk3,背景颜色参数
*例子：
<?php
/***************************************
*作者：落梦天蝎（beluckly）
*完成时间：2006-12-18
*类名：CreatMiniature
*功能：生成多种类型的缩略图
*基本参数：$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;
}
}
}
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