本文实例讲述了CI框架封装的常用图像处理方法。分享给大家供大家参考，具体如下：
其实微信手机端上图时，列表图最好是缩略图，节省流量，这不，又被移动坑了一把，话费签一分就停机，流量欠到90块才停机，我也是醉了。。。
不说废话了，下面是用CI 的内置处理图像的库写的，小弟不才，遗漏之处敬请指出，谢谢。
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/**
* 生成缩略图
* @param $path 原图的本地路径
* @return null 创建一个 原图_thumb.扩展名 的文件
*
*/
public function dealthumb($path){
$config['image_library'] = 'gd2';
$config['source_image'] = $path;
$config['create_thumb'] = TRUE;
//生成的缩略图将在保持纵横比例 在宽度和高度上接近所设定的width和height
$config['maintain_ratio'] = TRUE;
$config['width'] = 80;
$config['height'] = 80;
$this->load->library('image_lib', $config);
$this->image_lib->resize();
$this->image_lib->clear();
}
/*
* 处理图像旋转
*/
public function transroate($path,$imgpath){
$this->load->library('image_lib');
//(必须)设置图像库
$config['image_library'] = 'gd2';
$newname = time().'_rote.jpg';
//设置图像的目标名/路径
$config['new_image'] =$imgpath.$newname;
//(必须)设置原始图像的名字/路径
$config['source_image'] = $path;
//决定新图像的生成是要写入硬盘还是动态的存在
$config['dynamic_output'] = FALSE;
//设置图像的品质。品质越高，图像文件越大
$config['quality'] = '90%';
//有5个旋转选项 逆时针90 180 270 度 vrt 竖向翻转 hor 横向翻转
$config['rotation_angle'] = 'vrt';
$this->image_lib->initialize($config);
if(@$this->image_lib->rotate()){
$this->image_lib->clear();
return $config['new_image'];
}else{
$this->image_lib->clear();
return '';
}
}
/**
* 处理图像水印
*/
public function overlay($path,$imgpath){
$this->load->library('image_lib');
$newname = time().'_over.jpg';
//设置新图像名称
$config['new_image'] =$imgpath.$newname;
//调用php gd库 绘图
$config['image_library'] = 'gd2';
//源图像 本地地址
$config['source_image'] = $path;
//覆盖文字
$config['wm_text'] = 'Copyright 2015 - Friker';
//覆盖类型 文字/图像
$config['wm_type'] = 'text';
//文字字体类型
//$config['wm_font_path'] = 'C:\Windows\Fonts\vrinda.ttf';
//字体大小
$config['wm_font_size'] = '16';
//字体颜色
$config['wm_font_color'] = 'ff0000';
//垂直方向距离顶端距离
$config['wm_vrt_alignment'] = '20';
//水平方向距离左端距离
$config['wm_hor_alignment'] = 'center';
//padding
$config['wm_padding'] = '20';
$this->image_lib->initialize($config);
if($this->image_lib->watermark()){
$this->image_lib->clear();
return $config['new_image'];
}else{
$this->image_lib->clear();
return '';
}
}
/**
* 处理图片上传
* 文件上传类 通过前台 上传文件
*/
public function uploadfile(){
//文件上传部分
// 处理文件
// $data = '';
$this->load->helper('url');
$formpic = key($_FILES);
//文件处理部分
if(false === empty($_FILES[$formpic]['tmp_name'])){
//设置文件上传的路径
$upload['upload_path'] = "./public/img/";
//限制文件上传的类型
$upload['allowed_types'] = 'jpeg|jpg|gif|png';
//限制文件上传的大小
$upload['max_size'] = 2048;
//设置文件上传的路径
$upload['file_name'] = date('YmdHis', time()).rand(10000, 99999);
//加载文件上传配置信息
$this->load->library('upload', $upload);
//处理文件上传
$this->upload->do_upload($formpic);
//返回文件上传信息
$image = $this->upload->data();
/*
'file_name' => string '2015071702051718388.jpg' (length=23)
'file_type' => string 'image/jpeg' (length=10)
'file_path' => string 'E:/wamp/www/testci/public/img/' (length=30)
'full_path' => string 'E:/wamp/www/testci/public/img/2015071702051718388.jpg' (length=53)
'raw_name' => string '2015071702051718388' (length=19)
'orig_name' => string '2015071702051718388.jpg' (length=23)
'client_name' => string 'u=415761610,1548338330&fm=116&gp=0.jpg' (length=38)
'file_ext' => string '.jpg' (length=4)
'file_size' => float 3.74
'is_image' => boolean true
'image_width' => int 146
'image_height' => int 220
'image_type' => string 'jpeg' (length=4)
'image_size_str' => string 'width="146" height="220"' (length=24)
*/
//var_dump($image);
//返回文件上传名字
$data = $image['file_name'];
$this->dealthumb($image['full_path']);
$this->overlay($image['full_path'],$image['file_path']);
$this->transroate($image['full_path'],$image['file_path']);//
$thumbdata = '';
//生成缩略图名称
$pos = strripos($image['file_name'], ".");
$newname = substr($image['file_name'], 0,$pos)."_thumb".substr($image['file_name'], $pos);
if(file_exists($image['file_path'].$newname)){
$thumbdata = $newname;
}
}
//$dirroot = $_SERVER['DOCUMENT_ROOT'];
//$this->dealthumb($dirroot."/public/img/".$data);
//上传失败
if(!$data){
echo json_encode(array('status'=>0,'msg'=>"上传失败！"));
}else{
//上传成功
echo json_encode(array(
'name'=>$data,
'pic'=>base_url()."public/img/".$data,
'picthumb'=>$thumbdata == '' ?$data:$thumbdata
));
}
}
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下面是前端的基本html代码：
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="stylesheet" href="/public/stylesheets/bootstrap.min.css" />
<link rel="stylesheet" href="/public/stylesheets/bootstrap-responsive.min.css" />
<link rel="stylesheet" href="/public/stylesheets/matrix-style.css" />
<link rel="stylesheet" href="/public/stylesheets/matrix-media.css" />
<script type="text/javascript" src="/public/javascripts/jquery.min.js"></script>
<script type="text/javascript" src="/public/javascripts/jquery.form.js"></script>
<script type="text/javascript" src="/public/javascripts/jquery.validate.js"></script>
<style type="text/css">
body{background:#eeeeee; margin:0px;}
</style>
</head>
<body>
<div class="control-group">
<label class="control-label"> 分享logo： </label>
<div class="controls">
<input type="file" name="sharepic" id="sharepic"/>
<input type="hidden" name="act_sharepic" value="" id="act_sharepic"/>(<sapn class="fred">最佳大小为 80 X 80 像素</sapn>)
<p style="margin:20px 0;"><img src="/public/img/default.png" alt="" id="sharepic_img"></p>
</div>
</div>
<script type="text/javascript">
$(function () {
/*****************图片上传部分开始 *******************/
var act = "<form class='myupload' action='"+"<?php echo site_url('mytest/uploadfile');?>"+"' method='post' enctype='multipart/form-data'></form>";
$("#sharepic").change(function(){
$(this).wrap(act);
$(this).parent(".myupload").ajaxSubmit({
dataType: 'json',
success: function(data) {
var src = data.pic;
//更改预览图像地址
$('#sharepic_img').attr("src",src);
$('#act_sharepic').val(data.name);
$('#sharepic').unwrap();
},
error:function(xhr){
alert(JSON.parse(xhr));
}
});
});
})
</script>
</body>
</html>
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希望本文所述对大家基于CodeIgniter框架的PHP程序设计有所帮助。