<?php
class Image {
    /*图片的基本信息*/
    private $info;
    /*构造函数,打开图片,读取到内存中*/
    public function __construct($src){
        $info = getimagesize($src);
        $this->info = array(
            'width' => $info[0],
            'height' => $info[1],
            'type' => image_type_to_extension($info[2],false),
            'mime' => $info['mime']
        );
        $fun = "imagecreatefrom{$this->info['type']}";
        $this->image = $fun($src);
    }

   /*操作图片(压缩)*/
    public function thumb($width,$height){
        //1.在内存中建立一个真色彩图片
        $image_thumb = imagecreatetruecolor($width,$height);
        //2.核心步骤,将原图复制到新建的真色彩图片上,并且按照一定比例压缩
        imagecopyresampled($image_thumb,$this->image,0,0,0,0,$width,$height,$this->info['width'],$this->info['height']);
        //3.销毁原始图片
        imagedestroy($this->image);
        $this->image = $image_thumb;
    }

    /*操作图片(添加文字水印)*/
    public function fontmark($content,$font_url,$size,$color,$local,$angle){
        //设置字体的颜色和透明度,参数1 内存中的图片 2 red 3 gleen 4 bule 5 透明度
        $col = imagecolorallocatealpha($this->image,$color[0],$color[1],$color[2],$color[3]);
        //写入文件
        imagettftext($this->image,$size,$angle,$local['x'],$local['y'],$col,$font_url,$content);
    }

    /*操作图片(添加图片水印)*/
    public function imageMark($source,$local,$alpha){
        $info2 = getimagesize($source);
        $type2 = image_type_to_extension($info2[2],false);
        $fun2 = "imagecreatefrom{$type2}";
        $water = $fun2($source);
        imagecopymerge($this->image,$water,$local['x'],$local['y'],0,0,$info2[0],$info2[1],$alpha);
        imagedestroy($water);
    }

    /*在浏览器中输出图片*/
    public function show(){
        header("Content-type:".$this->info["mime"]);
        $funs = "image{$this->info['type']}";
        $funs($this->image);
    }

    /*把图片保存到硬盘里*/
    public function save($newname){
        $funs = "image{$this->info['type']}";
        $funs($this->image, $newname . "." . $this->info["type"]);
    }

    /*用析构函数销毁图片*/
    public function __destruct(){
        imagedestroy($this->image);
    }
}