php使用GD库画五角星_PHP教程

01     $width = 500; 

02     $height = 500; 

03   

04     $im = imagecreatetruecolor($width, $height); 

05   

06     $red = imagecolorallocate($im, 230, 0, 0); 

07     imagefill($im, 0, 0, $red); 

08   

09     $yellow = imagecolorallocate($im, 255, 255, 0); 

10       

11     //设定画出五角星的五个顶点形成的 正五边形的边长 

12     $b=100; 

13     $pi=3.14/180; 

14   

15     $p1x = 150; 

16     $p1y = 250; 

17   

18     $p2x = 150+(cos(36*$pi)*$b); 

19     $p2y = 250-(sin(36*$pi)*$b); 

20   

21     $p3x = 150+(2*cos(36*$pi)*$b); 

22     $p3y = 250; 

23   

24     $p4x = $p3x-sin(18*$pi)*$b; 

25     $p4y = 250+cos(18*$pi)*$b; 

26   

27     $p5x = 150+sin(18*$pi)*$b; 

28     $p5y = 250+cos(18*$pi)*$b; 

29       

30     //连接相应的点 画线 

31     imageline($im, $p1x, $p1y, $p3x, $p3y, $yellow); 

32     imageline($im, $p1x, $p1y, $p4x, $p4y, $yellow); 

33   

34     imageline($im, $p2x, $p2y, $p4x, $p4y, $yellow); 

35     imageline($im, $p2x, $p2y, $p5x, $p5y, $yellow); 

36   

37     imageline($im, $p3x, $p3y, $p5x, $p5y, $yellow); 

38   

39     header('Content-Type:image/png'); 

40   

41     imagepng($im); 

42   

43     imagedestroy($im); 

44   

45 ?>

http://www.bkjia.com/PHPjc/478005.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/478005.htmlTechArticle01 $width = 500; 02 $height = 500; 03 04 $im = imagecreatetruecolor($width, $height); 05 06 $red = imagecolorallocate($im, 230, 0, 0); 07 imagefill($im, 0, 0, $red); 08 09 $yellow...