實作中文圓形印章的PHP類

/*
 * 中文圓形印章類
 * @author lkk/lianq.net
 * @create on 10:03 2012-5-29
 * @example:
 * $seal = new circleSeal('你我他坐站走東西南北中',75,6,24,0,0,16,40);
 * $seal->doImg();
 */

class circleSeal {
 private $sealString; //印章字元
 private $strMaxLeng; //最大字元長度 private $sealRadius; //印章半徑
 private $rimWidth; //邊框厚度
 private $innerRadius; //內圓半徑
 private $startRadius; //五角星半徑
 private $startAngleglevate $startRadius ; //五角星傾斜角度
 private $backGround; //印章顏色
 private $centerDot; //圓心座標
 private $img; //圖形資源句柄
 private $font; //指定的字體
 private $fontSize; //指定字體大小
 private $width; //圖片寬度
 private $height; //圖片高度
 private $points; //五角星各點座標
 private $charRadius; //字串半徑
 private $charAngle; //字串傾斜角度
 private $spacing; //字元間隔角度

 //建構方法
 public function __construct($str ='', $rad = 75, $rmwidth = 6, $strad = 24, $stang = 0, $crang = 0, $fsize = 16, $inrad =0){
 $this->sealString = empty($str) ? '印章測試字串' : $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; //預設0,沒有
 $this->spacing = 1;
 }

 //建立圖片資源
 private function createImg(){
 $this->width = 2 * $this->sealRadius;
 $this->height = 2 * $this->sealRadius;
 $this->img = 。 0);
 }

 //畫印章邊框
 private function drawRim(){
 for($i=0;$irimWidth;$i ){
 imagearc($this->img,$this->centerDot['x'],$this->centerDot['y'],$this->width - $i,$this->height - $i ,0,360,$this->backGround);
 }
 }

 //畫內圓
 private function drawInnerCircle(){
 imagearc($this-this>img,$ this->centerDot['x'],$this->centerDot['y'],2*$this->innerRadius,2*$this->innerRadius,0,360,$this->backGround);
 }

 //畫字串
 private function drawString(){
 //編碼處理
 $charset = mb_detect_encoding($this->sealString);
 if($charset ! = 'UTF-8'){
 $this->sealString = mb_convert_encoding($this->sealString, 'UTF-8', 'GBK');
 }

 //相關計量
 $this->charRadius = $this->sealRadius - $this->rimWidth - $this->fontSize; //字串半徑
 $leng = mb_strlen($this->sealString,'utf8') ; //字串長度
 if($leng > $this->strMaxLeng) $leng = $this->strMaxLeng;
 $avgAngle = 360 / ($this->strMaxLeng); //平均字元傾斜度

 //拆分並寫入字串
 $words = array(); //字元陣列
 for($i=0;$i $words[] = mb_substr($this->sealString,$i,1,'utf8');
 $r = 630 $this->charAngle $avgAngle*($i - $leng/2) $this->spacing*($i-1); //座標角度
 $R = 720 - $this->charAngle $avgAngle*($leng-2*$i-1)/2 $this-> spacing*(1-$i); //字元角度
 $x = $this->centerDot['x'] $this->charRadius * cos(deg2rad($r)); //字元的x座標
 $y = $this->centerDot['y'] $this->charRadius * sin(deg2rad($r)); //字元的y座標
 imagettftext($this->img, $this ->fontSize, $R, $x, $y, $this->backGround, $this->font, $words[$i]);
 }
 }

 //繪圖方法
 private function drawStart(){
 $ang_out = 18 $this->startAngle;
$ang_in = 56 $this->startAngle;
$ rad_out = $this -> startRadius ;
 $rad_in = $rad_out * 0.382 ; this -> 點[ ] = $rad_out * cos ( 2 * M_PI / 5 * $i - deg2rad ( $ ang_out ) ) $this - > centerDot [ ' x ' ] ; rad_out * sin(2*M_PI/5*$i - deg2rad($ang_out)) $this->centerDot['y']; 點[] = $rad_in * cos(2*M_PI/5 *($i1) - deg2rad($ang_in)) $this->centerDot['x'];
 $this->points[] = $ rad_in * sin ( 2 * M_PI / 5 * ( $ i 1 ) - deg2rad ( $ ang_in ) ) $ this -> centerDot [ ' y ' ] ; ->points, 10, $this->backGround);
}

 // key
 私有 outPut (){
 header('Content-type:image/png');
 imagepng($this->img);
 imagedestroy($this->img); ();
 $ this->drawRim();
 $this->drawInnerCircle() ;
 $this->drawString(); ();
 $this->outPut();
 }
 }





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