<?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();      }  }