php 实现背景图上添加圆形logo

痛定思痛。 2022-07-24 06:30 104阅读 0赞

说一下步骤：

总共分 3 步：

1. 压缩logo 成固定大小的方形图片

2. 将logo 转成圆形logo

3. 将logo与背景图合并

废话不多说，直接上代码：

<?php
    /**
     * 作者：friker
     * 开发时间：20160516
     * 功能：图片处理
     *
     */
    class ImageController extends CI_Controller{
    
    	public function __construct()
    	{
    		parent::__construct();
    		date_default_timezone_set('Asia/Shanghai');
    		error_reporting( E_ALL&~E_NOTICE&~E_WARNING);
    		$this->load->library('curl');
    	}
    
    	/**
    	 * @todo : 本函数用于 将方形的图片压缩后
    	 *         再裁减成圆形 做成logo
    	 *         与背景图合并
    	 * @return 返回url
    	 */
    	public function index(){
    		//头像
    		$headimgurl = 'a.jpg';
    		//背景图
    		$bgurl = './aa.png';
    		$imgs['dst'] = $bgurl;
    		//第一步 压缩图片
    		$imggzip = $this->resize_img($headimgurl);
    		//第二步 裁减成圆角图片
    		$imgs['src'] = $this->test($imggzip);
    		//第三步 合并图片
    		$dest = $this->mergerImg($imgs);
    	}
    
    	public function resize_img($url,$path='./'){
    		$imgname = $path.uniqid().'.jpg';
    		$file = $url;
    		list($width, $height) = getimagesize($file); //获取原图尺寸
    		$percent = (110/$width);
    		//缩放尺寸
    		$newwidth = $width * $percent;
    		$newheight = $height * $percent;
    		$src_im = imagecreatefromjpeg($file);
    		$dst_im = imagecreatetruecolor($newwidth, $newheight);
    		imagecopyresized($dst_im, $src_im, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
    		imagejpeg($dst_im, $imgname); //输出压缩后的图片
    		imagedestroy($dst_im);
    		imagedestroy($src_im);
    		return $imgname;
    	}
    
    	//第一步生成圆角图片
    	public function test($url,$path='./'){
    		$w = 110;  $h=110; // original size
    	    $original_path= $url;
    	    $dest_path = $path.uniqid().'.png';
    	    $src = imagecreatefromstring(file_get_contents($original_path));
    	    $newpic = imagecreatetruecolor($w,$h);
    	    imagealphablending($newpic,false);
    	    $transparent = imagecolorallocatealpha($newpic, 0, 0, 0, 127);
    	    $r=$w/2;
    	    for($x=0;$x<$w;$x++)
    	        for($y=0;$y<$h;$y++){
    	            $c = imagecolorat($src,$x,$y);
    	            $_x = $x - $w/2;
    	            $_y = $y - $h/2;
    	            if((($_x*$_x) + ($_y*$_y)) < ($r*$r)){
    	                imagesetpixel($newpic,$x,$y,$c);
    	            }else{
    	                imagesetpixel($newpic,$x,$y,$transparent);
    	            }
    	        }
    	    imagesavealpha($newpic, true);
    	    // header('Content-Type: image/png');
    	    imagepng($newpic, $dest_path);
    	    imagedestroy($newpic);
    	    imagedestroy($src);
    	    unlink($url);
    	    return $dest_path;
    	}
    
    	//php 合并图片
        public function mergerImg($imgs,$path='./') {
    
            $imgname = $path.rand(1000,9999).uniqid().'.jpg';
            list($max_width, $max_height) = getimagesize($imgs['dst']);
            $dests = imagecreatetruecolor($max_width, $max_height);
            $dst_im = imagecreatefrompng($imgs['dst']);
            imagecopy($dests,$dst_im,0,0,0,0,$max_width,$max_height);
            imagedestroy($dst_im);
    
            $src_im = imagecreatefrompng($imgs['src']);
            $src_info = getimagesize($imgs['src']);
            imagecopy($dests,$src_im,270,202,0,0,$src_info[0],$src_info[1]);
            imagedestroy($src_im);
    
            // var_dump($imgs);exit;
            // header("Content-type: image/jpeg");
            imagejpeg($dests,$imgname);
            // unlink($imgs['dst']);
            unlink($imgs['src']);
            return $imgname;
        }
    
    
    }

结果展示：

![Center][]

[Center]: /images/20220722/d3e1a1326d2649dfb0c97c18f0ff465b.png