PHP实现中文圆形印章的特效

这篇文章主要介绍了关于PHP实现中文圆形印章的特效，有着一定的参考价值，现在分享给大家，有需要的朋友可以参考一下

心血来潮，写了个圆形印章生成器，字体的弧形旋转颇费功夫。总算效果还不错，代码存档。

方法一：

<?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']<em style="color:transparent">本文来源gao.dai.ma.com搞@代*码#网</em><a>搞代gaodaima码</a>,$this->centerDot['y'],$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();  }}

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