实现中文圆形印章的PHP类

1. /*
2. * 中文圆形印章类
3. * @author lkk/lianq.net
4. * @create on 10:03 2012-5-29
5. * @example:
6. * $seal = new circleSeal('你我他坐站走东西南北中',75,6,24,0,0,16,40);
7. * $seal->doImg();
8. */
10. class circleSeal {
11. private $sealString; //印章字符
12. private $strMaxLeng; //最大字符长度
13. private $sealRadius; //印章半径
14. private $rimWidth; //边框厚度
15. private $innerRadius; //内圆半径
16. private $startRadius; //五角星半径
17. private $startAngle; //五角星倾斜角度
18. private $backGround; //印章颜色
19. private $centerDot; //圆心坐标
20. private $img; //图形资源句柄
21. private $font; //指定的字体
22. private $fontSize; //指定字体大小
23. private $width; //图片宽度
24. private $height; //图片高度
25. private $points; //五角星各点坐标
26. private $charRadius; //字符串半径
27. private $charAngle; //字符串倾斜角度
28. private $spacing; //字符间隔角度
30. //构造方法
31. public function __construct($str ='', $rad = 75, $rmwidth = 6, $strad = 24, $stang = 0, $crang = 0, $fsize = 16, $inrad =0){
32. $this->sealString = empty($str) ? '印章测试字符串' : $str;
33. $this->strMaxLeng = 12;
34. $this->sealRadius = $rad;
35. $this->rimWidth = $rmwidth;
36. $this->startRadius = $strad;
37. $this->startAngle = $stang;
38. $this->charAngle = $crang;
39. $this->centerDot = array('x'=>$rad, 'y'=>$rad);
40. $this->font = dirname(__FILE__) .'/simkai.ttf';
41. $this->fontSize = $fsize;
42. $this->innerRadius = $inrad; //默认0,没有
43. $this->spacing = 1;
44. }
46. //创建图片资源
47. private function createImg(){
48. $this->width = 2 * $this->sealRadius;
49. $this->height = 2 * $this->sealRadius;
50. $this->img = imagecreate($this->width, $this->height);
51. imagecolorresolvealpha($this->img,255,255,255,127);
52. $this->backGround = imagecolorallocate($this->img,255,0,0);
53. }
55. //画印章边框
56. private function drawRim(){
57. for($i=0;$irimWidth;$i++){
58. imagearc($this->img,$this->centerDot['x'],$this->centerDot['y'],$this->width - $i,$this->height - $i,0,360,$this->backGround);
59. }
60. }
62. //画内圆
63. private function drawInnerCircle(){
64. imagearc($this->img,$this->centerDot['x'],$this->centerDot['y'],2*$this->innerRadius,2*$this->innerRadius,0,360,$this->backGround);
65. }
67. //画字符串
68. private function drawString(){
69. //编码处理
70. $charset = mb_detect_encoding($this->sealString);
71. if($charset != 'UTF-8'){
72. $this->sealString = mb_convert_encoding($this->sealString, 'UTF-8', 'GBK');
73. }
75. //相关计量
76. $this->charRadius = $this->sealRadius - $this->rimWidth - $this->fontSize; //字符串半径
77. $leng = mb_strlen($this->sealString,'utf8'); //字符串长度
78. if($leng > $this->strMaxLeng) $leng = $this->strMaxLeng;
79. $avgAngle = 360 / ($this->strMaxLeng); //平均字符倾斜度
81. //拆分并写入字符串
82. $words = array(); //字符数组
83. for($i=0;$i $words[] = mb_substr($this->sealString,$i,1,'utf8');
84. $r = 630 + $this->charAngle + $avgAngle*($i - $leng/2) + $this->spacing*($i-1); //坐标角度
85. $R = 720 - $this->charAngle + $avgAngle*($leng-2*$i-1)/2 + $this->spacing*(1-$i); //字符角度
86. $x = $this->centerDot['x'] + $this->charRadius * cos(deg2rad($r)); //字符的x坐标
87. $y = $this->centerDot['y'] + $this->charRadius * sin(deg2rad($r)); //字符的y坐标
88. imagettftext($this->img, $this->fontSize, $R, $x, $y, $this->backGround, $this->font, $words[$i]);
89. }
90. }
92. //画五角星
93. private function drawStart(){
94. $ang_out = 18 + $this->startAngle;
95. $ang_in = 56 + $this->startAngle;
96. $rad_out = $this->startRadius;
97. $rad_in = $rad_out * 0.382;
98. for($i=0;$i //五个顶点坐标
99. $this->points[] = $rad_out * cos(2*M_PI/5*$i - deg2rad($ang_out)) + $this->centerDot['x'];
100. $this->points[] = $rad_out * sin(2*M_PI/5*$i - deg2rad($ang_out)) + $this->centerDot['y'];
102. //内凹的点坐标
103. $this->points[] = $rad_in * cos(2*M_PI/5*($i+1) - deg2rad($ang_in)) + $this->centerDot['x'];
104. $this->points[] = $rad_in * sin(2*M_PI/5*($i+1) - deg2rad($ang_in)) + $this->centerDot['y'];
105. }
106. imagefilledpolygon($this->img, $this->points, 10, $this->backGround);
107. }
109. //输出
110. private function outPut(){
111. header('Content-type:image/png');
112. imagepng($this->img);
113. imagedestroy($this->img);
114. }
116. //对外生成
117. public function doImg(){
118. $this->createImg();
119. $this->drawRim();
120. $this->drawInnerCircle();
121. $this->drawString();
122. $this->drawStart();
123. $this->outPut();
124. }
125. }

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PHP