PHP实现中文圆形印章特效，

<?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(); } }

<?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;//中心点坐标 $r=65;$m=40;//半径，角度 $size=16;//字体大小 $r=$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); ?>