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php实现背景图上添加圆形logo图标的方法

时间:2021-07-01 10:21:17 帮助过:11人阅读

本文实例讲述了php实现背景图上添加圆形logo图标的方法。分享给大家供大家参考,具体如下:

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:

20161031140826605.jpg

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