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| <?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 = $_file;
list($this->width, $this->height, $this->type) = getimagesize($this->file);
$this->img = $this->getFromImg($this->file, $this->type);
}
//缩略图(固定长高容器，图像等比例，扩容填充，裁剪)[固定了大小，不失真，不变形]
public function thumb($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:
$img = '';
}
return $img;
}
//图像输出
public function out() {
imagepng($this->new,$this->file);//第二个参数为新生成的图片名
imagedestroy($this->img);
imagedestroy($this->new);
}
}
//使用demo
$_path = '1.jpg';//$_path为图片文件的路径
$_img = new Image($_path);
$_img->thumb(100, 100);
$_img->out();
?>
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