<?php
/*
 * Material-Design-Avatars
 * https://github.com/lincanbin/Material-Design-Avatars
 *
 * Copyright 2015 Canbin Lin (lincanbin@hotmail.com)
 * http://www.94cb.com/
 *
 * Licensed under the Apache License, Version 2.0:
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Create material deisgn avatars for users just like Gmail or Messager in Android.
 */
class MDAvtars
{
    public $Char;
    public $AvatarSize;
    public $Padding;
    public $Avatar;
    public $FontFile;
    public $IsNotletter;
    public $LetterFont;
    public $AsianFont;
    public $EnableAsianChar;


    function __construct($Char, $AvatarSize = 256)
    {
        $this->Char = strtoupper(mb_substr($Char, 0, 1, "UTF-8"));
        $this->AvatarSize = $AvatarSize;
        $this->Padding = 30*($this->AvatarSize/256);
//        $this->LetterFont = dirname(__FILE__).'/fonts/SourceCodePro-Light.ttf';
        $this->LetterFont = dirname(__FILE__).'/fonts/PingFang_Bold.ttf';
        $this->AsianFont = dirname(__FILE__).'/fonts/PingFang_Bold.ttf';

        $this->LetterFont = dirname(__FILE__).'/fonts/SourceCodePro-Regular.ttf';
        $this->AsianFont = dirname(__FILE__).'/fonts/SourceHanSansCN-Normal.ttf';

        $this->EnableAsianChar = is_file($this->AsianFont);

        $CNChar=ord($this->Char);
        if (!$this->EnableAsianChar && 
            preg_match("/^[\x7f-\xff]/", $this->Char) && 
            !($CNChar>=ord("A") && $CNChar<=ord("z"))
           ){
            //如果是中文，并且没有中文字体包，则按拼音首字母对其进行转换
            $CNByte = iconv("UTF-8","gb2312", $this->Char);
            $Code=ord($CNByte{0}) * 256 + ord($CNByte{1}) - 65536;//求其偏移量
            if($Code>=-20319 and $Code<=-20284) $this->Char = "A";
            if($Code>=-20283 and $Code<=-19776) $this->Char = "B";
            if($Code>=-19775 and $Code<=-19219) $this->Char = "C";
            if($Code>=-19218 and $Code<=-18711) $this->Char = "D";
            if($Code>=-18710 and $Code<=-18527) $this->Char = "E";
            if($Code>=-18526 and $Code<=-18240) $this->Char = "F";
            if($Code>=-18239 and $Code<=-17923) $this->Char = "G";
            if($Code>=-17922 and $Code<=-17418) $this->Char = "H";
            if($Code>=-17417 and $Code<=-16475) $this->Char = "J";
            if($Code>=-16474 and $Code<=-16213) $this->Char = "K";
            if($Code>=-16212 and $Code<=-15641) $this->Char = "L";
            if($Code>=-15640 and $Code<=-15166) $this->Char = "M";
            if($Code>=-15165 and $Code<=-14923) $this->Char = "N";
            if($Code>=-14922 and $Code<=-14915) $this->Char = "O";
            if($Code>=-14914 and $Code<=-14631) $this->Char = "P";
            if($Code>=-14630 and $Code<=-14150) $this->Char = "Q";
            if($Code>=-14149 and $Code<=-14091) $this->Char = "R";
            if($Code>=-14090 and $Code<=-13319) $this->Char = "S";
            if($Code>=-13318 and $Code<=-12839) $this->Char = "T";
            if($Code>=-12838 and $Code<=-12557) $this->Char = "W";
            if($Code>=-12556 and $Code<=-11848) $this->Char = "X";
            if($Code>=-11847 and $Code<=-11056) $this->Char = "Y";
            if($Code>=-11055 and $Code<=-10247) $this->Char = "Z";
        }
        if(in_array($this->Char, str_split('QWERTYUIOPASDFGHJKLZXCVBNM0123456789', 1))){
            $this->IsNotletter = false;
            $this->FontFile = $this->LetterFont;
        }else{
            $this->IsNotletter = true;
            $this->FontFile = $this->AsianFont;
        }
        $this->Initialize();
    }

    private function Initialize()
    {
        //extension_loaded('gd')
        $Width  = $this->AvatarSize;//Width of avatar
        $Height = $this->AvatarSize;//Height of avatar
        $Padding = $this->Padding;
        $this->Avatar = imagecreatetruecolor($Width, $Height);
        //全透明背景
        imageSaveAlpha($this->Avatar, true);
        $BackgroundAlpha = imagecolorallocatealpha($this->Avatar, 255, 255, 255, 127);
        imagefill($this->Avatar, 0, 0, $BackgroundAlpha);
        //抗锯齿
        if(function_exists('imageantialias')){
            imageantialias($this->Avatar, true);
        }
        //Material Design参考颜色
        //http://www.google.com/design/spec/style/color.html#color-color-palette
        $MaterialDesignColor = array(
                                     array(111, 212, 230),
                                     array(248, 216, 104),
                                     array(157, 215, 203),
                                     array(254, 165, 141),
                                     array(162, 209, 71),
                                     array(86, 156, 235)
                                         );
        $BackgroundColorIndex = mt_rand(0, count($MaterialDesignColor)-1);
        $BackgroundColor = imagecolorallocate($this->Avatar, 
                                              $MaterialDesignColor[$BackgroundColorIndex][0],
                                              $MaterialDesignColor[$BackgroundColorIndex][1],
                                              $MaterialDesignColor[$BackgroundColorIndex][2]
                                             );
        //画一个居中圆形
//        imagefilledellipse($this->Avatar, 
//                           $Width/2, 
//                           $Height/2, 
//                           $Width, 
//                           $Height, 
//                           $BackgroundColor
//                          );

        imagefilledrectangle($this->Avatar, 
                           0, 
                           0, 
                           $Width, 
                           $Height, 
                           $BackgroundColor
                          );

        //字体
        $FontColor = imagecolorallocate($this->Avatar, 255, 255, 255);
        if($this->IsNotletter){
            //中文字符偏移
//            $FontSize = $Width - $Padding * 3.5 - 60;
//            $X = $Padding + (-2/166)*$FontSize + 30;
//            $Y = $Height - $Padding - (23.5/166) * $FontSize - 50;

            $FontSize = $Width - $Padding * 3.5;
            $FontSize = 240;
            $X = $Padding + (-2/166)*$FontSize + 42 ;
            $Y = $Height - $Padding - (23.5/166) * $FontSize - 50;
        }else{
            // 字母
            $Padding = 60*($this->AvatarSize/256);
            $FontSize = $Width - $Padding * 2;
            $X = $Padding + (20/196)*$FontSize;
            $Y = $Height - $Padding - (13/196)*$FontSize;
        }

        // 在圆正中央填入字符
        imagettftext($this->Avatar, 
                     $FontSize, 
                     0, 
                     $X, 
                     $Y, 
                     $FontColor, 
                     $this->FontFile, 
                     $this->Char
                    );
    }

    private function Resize($TargetSize)
    {
        if (isset($this->Avatar)) {
            if ($this->AvatarSize > $TargetSize) {
                $Percent      = $TargetSize / $this->AvatarSize;
                $TargetWidth  = round($this->AvatarSize * $Percent);
                $TargetHeight = round($this->AvatarSize * $Percent);
                $TargetImageData = imagecreatetruecolor($TargetWidth, $TargetHeight);
                //全透明背景
                imageSaveAlpha($TargetImageData, true);
                $BackgroundAlpha = imagecolorallocatealpha($TargetImageData, 255, 255, 255, 127);
                imagefill($TargetImageData, 0, 0, $BackgroundAlpha);
                imagecopyresampled($TargetImageData, $this->Avatar, 0, 0, 0, 0, $TargetWidth, $TargetHeight, $this->AvatarSize, $this->AvatarSize);
                return $TargetImageData;
            } else {
                return $this->Avatar;
            }
        } else {
            return false;
        }
    }

    public function Free()
    {
        imagedestroy($this->Avatar);
    }

    public function Output2Browser($AvatarSize=0)
    {
        if(!$AvatarSize){
            $AvatarSize = $this->AvatarSize;
        }
        header ('Content-Type: image/png');
        imagepng($this->Resize($AvatarSize));
    }

    public function Save($Path, $AvatarSize=0)
    {
        if(!$AvatarSize){
            $AvatarSize = $this->AvatarSize;
        }
        return imagepng($this->Resize($AvatarSize), $Path);
    }
}