PHP实现中文圆形印章的特效

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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'],$this->centerDot['y'],$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(); }}

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); $stock='C:WINDOWSFontssimkai.ttf';$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);?>

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