PHP實現中文圓形印章特效

 　　心血來潮，寫了個圓形印章生成器，字體的弧形旋轉頗費功夫。總算效果還不錯，代碼存檔。

　　方法一：

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 <?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; //印章字符 private $strMaxLeng; //最大字符長度 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; //圓心坐標 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; //五角星各點坐標 private $charRadius; //字符串半徑 private $charAngle; //字符串傾斜角度 private $spacing; //字符間隔角度   //構造方法 public function __construct($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; //默認0,沒有 $this->spacing = 1; }   //創建圖片資源 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); }   //畫字符串 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; //字符串半徑 $leng = mb_strlen($this->sealString,'utf8'); //字符串長度 if($leng > $this->strMaxLeng) $leng = $this->strMaxLeng; $avgAngle = 360 / ($this->strMaxLeng); //平均字符傾斜度   //拆分並寫入字符串 $words = array(); //字符數組 for($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); //坐標角度 $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坐標 $y = $this->centerDot['y'] + $this->charRadius * sin(deg2rad($r)); //字符的y坐標 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++){ //五個頂點坐標 $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'];   //內凹的點坐標 $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); } &