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...