<?php

namespace framework\utils;

class Image{

private $img=[

'filename'=>'',

'w'=>0,

'h'=>0,

'mime'=>'',

'type'=>null

];

// 生成的新资源的图片数据类型

private $image=[

'h'=>0,

'w'=>0,

'im'=>null

];

private $gdVersion=null;

public function __construct($path=''){

if(extension_loaded('gd')&&!empty($path)&&!($image_info = getimagesize($path))){

$this->img['filename'] = $path;

$this->img['w'] = $image_info[0];

$this->img['h'] = $image_info[1];

$this->img['mime'] = strtolower($image_info['mime']);

$this->img['type'] = str_replace('image/', '', $this->img['mime']);

$gd = gd_info();

$this->gdVersion = preg_match('/2\.\d\.\d/i', $gd['GD Version'])?2:1;

}

}

/**

* 验证码生成

* @param integer $w 验证码宽度

* @param integer $h 验证码高度

* @param integer $n 随机字符串个数

* @param array $color 背景色

* @return [type] [description]

*/

public function captcha($h=0,$n=4,$bgcolor=[255,255,255],$color=[0,0,0]){

$this->imageNewSource($h,$n,$bgcolor);

$this->createCode($n,$color);

$this->interference($color);

//输出

header("Content-Type:image/png;");

imagepng($this->image['im']);

// imagedestroy($this->image['im']);

}

/**

* 图片缩放

* 0 以宽度为参照缩放

* 1 以高度为参照缩放

* other 以百分比为参照

* @param integer $refer 参照数

* @param string $save_path 文件保存路径

* @param integer $order 依据

* @return bool

*/

public function thumb($refer=100,$save_path='',$order=0){

if($order==0){

// 默认以宽度进行缩放计算

$new_w = $refer;

$new_h = $new_w*$this->img['h']/$this->img['w'];

}elseif($order==1){

// 依据高度作缩放尺寸计算

$new_h = $refer;

$new_w=$new_h*$this->img['w']/$this->img['h'];

}else{

$refer = (($refer/100)>1||($refer/100)<0)?1:($refer/100);

$new_w = $this->img['w']*$refer;

$new_h = $this->img['h']*$refer;

}

$src_image = $this->image_source();

$dst_image = imagecreatetruecolor($new_w, $new_h);

if(imagecopyresampled($dst_image, $src_image, 0, 0, 0, 0, $new_w, $new_h, $this->img['w'], $this->img['h'])){

$this->image_save($dst_image,$save_path);

}

}

/**

* 图片截取

* @param integer $start_x 采样开始x轴位置

* @param integer $start_y 采样开始y轴位置

* @param integer $x_len 在x轴上从tart_x开始取的长度

* @param integer $y_len 在y轴上从tart_y开始取的长度

* @param integer $dst_w 新文件的宽度

* @param integer $dst_h 新文件的高度

* @param string $save_path 新文件保存路径

* @return bool

*/

public function crop($start_x=0,$start_y=0, $x_len=0, $y_len=0, $dst_w=0, $dst_h=0, $save_path=''){

if($x_len>($dst_w-$start_x)) $x_len=$dst_w-$start_x;

if($y_len>($dst_h-$start_y)) $y_len=$dst_h-$start_y;

$src_image = $this->image_source();

$dst_image = imagecreatetruecolor($dst_w, $dst_h);

if(imagecopyresampled($dst_image, $src_image, 0, 0, $start_x, $start_y,$dst_w, $dst_h, $x_len, $y_len)){

$this->image_save($dst_image,$save_path);

}

}

/**

* 生成一个图片资源返回

* @param string $path 资源路径

* @param string $from 创建类型

* @return source

*/

private function image_source($path='',$from=''){

$path = empty($path)?$this->img['filename']:$path;

$from = empty($from)?$this->img['type']:$from;

$create_func = 'imagecreatefrom'.$from;

return $create_func($path);

}

/**

* 创建新的图片资源

* @param integer $w 图片宽度

* @param integer $h 图片高度

* @return void

*/

private function imageNewSource($h=0,$n=0,$color=[0,0,0]){

//创建图片

$this->image['h']=$h;

$this->image['w']=$n*$h*3/5;

$this->image['im'] = imagecreatetruecolor($this->image['w'], $h);

// 填充颜色

imagefill($this->image['im'], 0, 0, $this->getColor($this->image['im'],$color));

}

/**

* 存储生成的图片文件

* @param string $save_path 保存的路径 文件名

* @param source $im 要保存的资源

* @return bool

*/

private function image_save($im=null,$save_path=''){

$save_path = empty($save_path)?$this->img['filename']:$save_path;

$output_image = 'image'.$this->img['type'];

$output_image($im, $save_path);

imagedestroy($im);

}

/**

* 创建验证码随机字符

* @param integer $n 验证码字符个数

* @param array $color 字体颜色

* @return [type] [description]

*/

private function createCode($n=0,$color=[0,0,0]){

//生成随机数

$code='';

$charlist = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';

$len = strlen($charlist)-1;

for($i=0;$i<$n;$i++) $code.=$charlist[mt_rand(0,$len)];

//写入图片

$font_size=$this->gdVersion==2?$this->image['h']*2/11:$this->image['h'];

$font_size=$this->image['h']*3/5; //1pt = 3/4 px

$str_x = $this->image['h']*mt_rand(20,30)/100;

$str_y = $this->image['h']*4/5;

// 验证码字体

$font_path = dirname(__FILE__).DIRECTORY_SEPARATOR.'fonts'.DIRECTORY_SEPARATOR;

$font_path.='roughtrad.ttf';

// $font_path.='HotelOriental.ttf';

// $font_path.='Comic.ttf';

$im_color = $this->getColor($this->image['im'],$color);

for($i=0;$i<$n;$i++){

$angle=mt_rand(0,10);

$pos = imagettftext($this->image['im'], $font_size, $angle, $str_x, $str_y, $im_color, $font_path, $code[$i]);

$str_x=$pos[4]*mt_rand(95,105)/100;

}

// set session

}

/**

* 生成验证码上的干扰线

* @param integer $mode 干扰线模式 1->曲线 2->点 3->曲线+点

* @return void

*/

private function interference($color=[0,0,0],$mode=1){

$im_color = $this->getColor($this->image['im'],$color);

for($i=0;$i<2;$i++){

//干扰线

$cx=mt_rand(0,1)?mt_rand(2,10):mt_rand(2,10)+$this->image['w'];

$cy=mt_rand(2,5)-10;

$cw=$this->image['w']*mt_rand(21,25)/10;

$ch=$this->image['h']*mt_rand(12,14)/10;

imagesetthickness($this->image['im'], 3);

imagearc($this->image['im'], $cx, $cy, $cw, $ch, 0, 359.9, $im_color);

}

}

/**

* 设置颜色值

* @param source $im 图片资源

* @param int $r red

* @param int $g green

* @param int $b blue

* @return void

*/

private function getColor($im=null,$color=array(0,0,0)){

list($r,$g,$b) = $color;

return imagecolorallocate($im, $r, $g, $b);

}

public function __destruct(){

// imagedestroy($this->image['im']);

}

}