PHP实现中文圆形印章特效

<?php
/*
 * 中文圆形印章类
 * @author lkk/lianq.net
 * @create on 10:03 2012-5-29
 * @example:
 * $seal = new circleseal('你我他坐站走东西南北中',75,6,24,0,0,16,40);
 * $seal->doimg();
 */
 
class circleseal {
  private $sealstring;  //印章字符
  private $strmaxleng;  //最大字符长度
  private $sealradius;  //印章半径
  private $rimwidth;   //边框厚度
  private $innerradius;  //内圆半径
  private $startradius;  //五角星半径
  private $startangle;  //五角星倾斜角度
  private $background;  //印章颜色
  private $centerdot;   //圆心坐标
  private $img;      //图形资源句柄
  private $font;     //指定的字体
  private $fontsize;   //指定字体大小
  private $width;     //图片宽度
  private $height;    //图片高度
  private $points;    //五角星各点坐标
  private $charradius;  //字符串半径
  private $charangle;   //字符串倾斜角度
  private $spacing;    //字符间隔角度
 
  //构造方法
  public function __construct($str ='', $rad = 75, $rmwidth = 6, $strad = 24, $stang = 0, $crang = 0, $fsize = 16, $inrad =0){
    $this->sealstring  = empty($str) ? '印章测试字符串' : $str;
    $this->strmaxleng  = 12;
    $this->sealradius  = $rad;
    $this->rimwidth   = $rmwidth;
    $this->startradius = $strad;
    $this->startangle  = $stang;
    $this->charangle  = $crang;
    $this->centerdot  = array('x'=>$rad, 'y'=>$rad);
    $this->font     = dirname(__file__) .'/simkai.ttf';
    $this->fontsize   = $fsize;
    $this->innerradius = $inrad;  //默认0,没有
    $this->spacing   = 1;
  }
 
  //创建图片资源
  private function createimg(){
    $this->width    = 2 * $this->sealradius;
    $this->height    = 2 * $this->sealradius;
    $this->img     = imagecreate($this->width, $this->height);
    imagecolorresolvealpha($this->img,255,255,255,127);
    $this->background  = imagecolorallocate($this->img,255,0,0);
  }
 
  //画印章边框
  private function drawrim(){
    for($i=0;$i<$this->rimwidth;$i++){
      imagearc($this->img,$this->centerdot['x'],$this->centerdot['y'],$this->width - $i,$this->height - $i,0,360,$this->background);
    }
  }
 
  //画内圆
  private function drawinnercircle(){
    imagearc($this->img,$this->centerdot['x'],$this->centerdot['y'],2*$this->innerradius,2*$this->innerradius,0,360,$this->background);
  }
 
  //画字符串
  private function drawstring(){
    //编码处理
    $charset = mb_detect_encoding($this->sealstring);
    if($charset != 'utf-8'){
      $this->sealstring = mb_convert_encoding($this->sealstring, 'utf-8', 'gbk');
    }
 
    //相关计量
    $this->charradius = $this->sealradius - $this->rimwidth - $this->fontsize; //字符串半径
    $leng  = mb_strlen($this->sealstring,'utf8'); //字符串长度
    if($leng > $this->strmaxleng) $leng = $this->strmaxleng;
    $avgangle  = 360 / ($this->strmaxleng);  //平均字符倾斜度
 
    //拆分并写入字符串
    $words = array(); //字符数组
    for($i=0;$i<$leng;$i++){
      $words[] = mb_substr($this->sealstring,$i,1,'utf8');
      $r = 630 + $this->charangle + $avgangle*($i - $leng/2) + $this->spacing*($i-1);   //坐标角度
      $r = 720 - $this->charangle + $avgangle*($leng-2*$i-1)/2 + $this->spacing*(1-$i);  //字符角度
      $x = $this->centerdot['x'] + $this->charradius * cos(deg2rad($r)); //字符的x坐标
      $y = $this->centerdot['y'] + $this->charradius * sin(deg2rad($r)); //字符的y坐标
      imagettftext($this->img, $this->fontsize, $r, $x, $y, $this->background, $this->font, $words[$i]);
    }
  }  
 
  //画五角星
  private function drawstart(){
    $ang_out = 18 + $this->startangle;
    $ang_in = 56 + $this->startangle;
    $rad_out = $this->startradius;
    $rad_in = $rad_out * 0.382;
    for($i=0;$i<5;$i++){
      //五个顶点坐标
      $this->points[] = $rad_out * cos(2*m_pi/5*$i - deg2rad($ang_out)) + $this->centerdot['x'];
      $this->points[] = $rad_out * sin(2*m_pi/5*$i - deg2rad($ang_out)) + $this->centerdot['y'];
 
      //内凹的点坐标
      $this->points[] = $rad_in * cos(2*m_pi/5*($i+1) - deg2rad($ang_in)) + $this->centerdot['x'];
      $this->points[] = $rad_in * sin(2*m_pi/5*($i+1) - deg2rad($ang_in)) + $this->centerdot['y'];
    }
    imagefilledpolygon($this->img, $this->points, 10, $this->background);
  }
 
  //输出
  private function output(){
    header('content-type:image/png');
    imagepng($this->img);
    imagedestroy($this->img);
  }
 
  //对外生成
  public function doimg(){
    $this->createimg();
    $this->drawrim();
    $this->drawinnercircle();
    $this->drawstring();
    $this->drawstart();
    $this->output();
  }
}

<?php
@$hos=iconv("gbk", "utf-8", $_get["hos"]);
if(!isset($hos))
exit;

$im=imagecreate(150,150);
$gray=imagecolorresolvealpha($im,200,200,200,127);
$red=imagecolorallocate($im,230,150,150);

for($i=0;$i<6;$i++)
imagearc($im,75,75,148-$i,148-$i,0,360,$red);

$stock='c:\windows\fonts\simkai.ttf';
$point="★";
$size=30;
imagettftext($im,$size,0,72-$size/2,72+$size/2,$red,$stock,$point);

$a=75;$b=-75;//中心点坐标
$r=65;$m=40;//半径，角度
$size=16;//字体大小
$r=$r-$size;

$word=array();
$max=18;
$count=mb_strlen($hos,'utf8');
if($count>$max)$count=$max;
if($count>12)
$m=floor(360/$count);
else if($count>5)
$m-=$count;

for($i=0;$i<$count;$i++)
$word[]=mb_substr($hos,$i,1,'utf8');

$j=floor($count/2);
if($j!=$count/2)
{
 for($i=$j;$i>=0;$i--)
 {
 $arc=$m*($j-$i)+$size/2;
 $x=round($r*cos((90+$arc)*m_pi/180))+$a;
 $y=-1*(round($r*sin((90+$arc)*m_pi/180))+$b);
 if($arc<10)$arc=0; 
 imagettftext($im,$size,$arc,$x,$y,$red,$stock,$word[$i]);
 $arc=$m*($j-$i)-$size/2;
 $x=round($r*cos((90-$arc)*m_pi/180))+$a;
 $y=-1*(round($r*sin((90-$arc)*m_pi/180))+$b);
 if($arc<10)$arc=0; 
 imagettftext($im,$size,-$arc,$x,$y,$red,$stock,$word[$j+$j-$i]);
 }
}
else
{
 $j=$j-1;
 for($i=$j;$i>=0;$i--)
 {
 $arc=$m/2+$m*($j-$i)+$size/2;
 $x=round($r*cos((90+$arc)*m_pi/180))+$a;
 $y=-1*(round($r*sin((90+$arc)*m_pi/180))+$b);
 imagettftext($im,$size,$arc,$x,$y,$red,$stock,$word[$i]); 
 $arc=$m/2+$m*($j-$i)-$size/2;
 $x=round($r*cos((90-$arc)*m_pi/180))+$a;
 $y=-1*(round($r*sin((90-$arc)*m_pi/180))+$b);
 imagettftext($im,$size,-$arc,$x,$y,$red,$stock,$word[$j+$j+1-$i]);
 }
}

header('content-type:image/png');
imagepng($im);
?>