PHP处理图片固定大小 不失真 不变形

由于工中使用到此代码 借鉴了各位前辈们代码的基础上修改而来 如果您的项目中有需要此代码 要以尽情的复制和修改 ；如果您有更好的代码烦请告知本人 。

我将感激不尽

下面由上代码

<?php
//图像处理类
class Image {
private $file;				//图片地址
private $width;			//图片长度
private $height;			//图片长度
private $type;				//图片类型
private $img;				//原图的资源句柄
private $new;				//新图的资源句柄

//构造方法，初始化
public function __construct($_file) {
$this->file = $_SERVER["DOCUMENT_ROOT"].$_file;
list($this->width, $this->height, $this->type) = getimagesize($this->file);
$this->img = $this->getFromImg($this->file, $this->type);
}

//cke专用图像处理
public function ckeImg($new_width = 0,$new_height = 0) {
list($_water_width,$_water_height,$_water_type) = getimagesize(MARK);
$_water = $this->getFromImg(MARK,$_water_type);

if (empty($new_width) && empty($new_height)) {
$new_width = $this->width;
$new_height = $this->height;
}

if (!is_numeric($new_width) || !is_numeric($new_height)) {
$new_width = $this->width;
$new_height = $this->height;
}

if ($this->width > $new_width) { //通过指定长度，获取等比例的高度
$new_height = ($new_width / $this->width) * $this->height;
} else {
$new_width = $this->width;
$new_height = $this->height;
}

if ($this->height > $new_height) { //通过指定高度，获取等比例长度
$new_width = ($new_height / $this->height) * $this->width;
} else {
$new_width = $this->width;
$new_height = $this->height;
}

$_water_x = $new_width - $_water_width - 5;
$_water_y = $new_height - $_water_height - 5;

$this->new = imagecreatetruecolor($new_width,$new_height);
imagecopyresampled($this->new,$this->img,0,0,0,0,$new_width,$new_height,$this->width,$this->height);
if ($new_width > $_water_width && $new_height > $_water_height) {
imagecopy($this->new,$_water,$_water_x,$_water_y,0,0,$_water_width,$_water_height);
}
imagedestroy($_water);
}

//缩略图(固定长高容器，图像等比例，扩容填充，裁剪)[固定了大小，不失真，不变形]
public function thumb($new_width = 0,$new_height = 0) {

if (empty($new_width) && empty($new_height)) {
$new_width = $this->width;
$new_height = $this->height;
}

if (!is_numeric($new_width) || !is_numeric($new_height)) {
$new_width = $this->width;
$new_height = $this->height;
}

//创建一个容器
$_n_w = $new_width;
$_n_h = $new_height;

//创建裁剪点
$_cut_width = 0;
$_cut_height = 0;

if ($this->width < $this->height) {
$new_width = ($new_height / $this->height) * $this->width;
} else {
$new_height = ($new_width / $this->width) * $this->height;
}

if ($new_width < $_n_w) { //如果新高度小于新容器高度
$r = $_n_w / $new_width; //按长度求出等比例因子
$new_width *= $r; //扩展填充后的长度
$new_height *= $r; //扩展填充后的高度
$_cut_height = ($new_height - $_n_h) / 2; //求出裁剪点的高度
}

if ($new_height < $_n_h) { //如果新高度小于容器高度
$r = $_n_h / $new_height; //按高度求出等比例因子
$new_width *= $r; //扩展填充后的长度
$new_height *= $r; //扩展填充后的高度
$_cut_width = ($new_width - $_n_w) / 2; //求出裁剪点的长度
}

$this->new = imagecreatetruecolor($_n_w,$_n_h);
imagecopyresampled($this->new,$this->img,0,0,$_cut_width,$_cut_height,$new_width,$new_height,$this->width,$this->height);
}

//加载图片，各种类型，返回图片的资源句柄
private function getFromImg($_file, $_type) {
switch ($_type) {
case 1 :
$img = imagecreatefromgif($_file);
break;
case 2 :
$img = imagecreatefromjpeg($_file);
break;
case 3 :
$img = imagecreatefrompng($_file);
break;
default:
Tool::alertBack('警告：此图片类型本系统不支持！');
}
return $img;
}

//图像输出
public function out() {
imagepng($this->new,$this->file);
imagedestroy($this->img);
imagedestroy($this->new);
}
}

?>

CK专用是专门处理CK编辑器所传图片 如有不需要的同学请删除