You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
89 lines
3.2 KiB
89 lines
3.2 KiB
<?php
|
|
namespace app\index\model;
|
|
|
|
use think\Model;
|
|
|
|
class Image extends Model{
|
|
private $file; //图片地址
|
|
private $width; //图片长度
|
|
private $height; //图片长度
|
|
private $itype; //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, $this->itype) = getimagesize($this->file);
|
|
$this->img = $this->getFromImg($this->file, $this->itype);
|
|
}
|
|
//缩略图(固定长高容器，图像等比例，扩容填充，裁剪)[固定了大小，不失真，不变形]
|
|
public function thumb($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,$this->height);
|
|
}
|
|
|
|
//加载图片，各种类型，返回图片的资源句柄
|
|
public function getFromImg($_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 $img;
|
|
}
|
|
|
|
//图像输出
|
|
public function output($name = "") {
|
|
imagepng($this->new,$this->file.$name);//第二个参数为新生成的图片名
|
|
imagedestroy($this->img);
|
|
imagedestroy($this->new);
|
|
}
|
|
}
|
|
?>
|