PHP實現中文圓形印章的特效

這篇文章主要介紹了關於PHP實現中文圓形印章的特效，有著一定的參考價值，現在分享給大家，有需要的朋友可以參考一下

心血來潮，寫了個圓形印章產生器，字型的弧形旋轉頗費功夫。總算效果還不錯，代碼存檔。

方法一：

<?php/* * 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 $startAngle;  //五角星傾斜角度  private $backGround;  //印章顏色  private $centerDot;   //圓心座標  private $img;      //圖形資源控制代碼  private $font;     //指定的字型  private $fontSize;   //指定字型大小  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 $spacing;    //字元間隔角度    //構造方法  public function __construct($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;    $this->img     = imagecreate($this->width, $this->height);    imagecolorresolvealpha($this->img,255,255,255,127);    $this->backGround  = imagecolorallocate($this->img,255,0,0);  }    //畫印章邊框  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);    }  }    //畫內圓  private function drawInnerCircle(){    imagearc($this->img,$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    $words = array(); //字元數組    for($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);   //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]);    }  }     //畫五角星  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++){      //五個頂點座標      $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'];        //內凹的點座標      $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, $this->backGround);  }    //輸出  private function outPut(){    header('Content-type:image/png');    imagepng($this->img);    imagedestroy($this->img);  }    //對外產生  public function doImg(){    $this->createImg();    $this->drawRim();    $this->drawInnerCircle();    $this->drawString();    $this->drawStart();    $this->outPut();  }}

方法二：

<?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;//中心點座標$r=65;$m=40;//半徑，角度$size=16;//字型大小$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);?>

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