PHP uses GD library to draw Pentagram _php tutorial

$width = 500;

$height = 500;

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$im = Imagecreatetruecolor ($width, $height);

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$red = Imagecolorallocate ($im, 230, 0, 0);

Imagefill ($im, 0, 0, $red);

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$yellow = Imagecolorallocate ($im, 255, 255, 0);

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11//Set the edge length of the positive Pentagon formed by the five vertices that draw the pentagram

$b = 100;

$pi =3.14/180;

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$p 1x = 150;

$p 1y = 250;

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$p 2x = 150+ (cos (36* $pi) * $b);

$p 2y = 250-(sin (36* $pi) * $b);

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$p 3x = 150+ (2*cos (36* $pi) * $b);

$p 3y = 250;

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$p 4x = $p 3x-sin (18* $pi) * $b;

$p 4y = 250+cos (18* $pi) * $b;

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$p 5x = 150+sin (18* $pi) * $b;

$p 5y = 250+cos (18* $pi) * $b;

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30//Connect the corresponding point draw line

Imageline ($im, $p 1x, $p 1y, $p 3x, $p 3y, $yellow);

Imageline ($im, $p 1x, $p 1y, $p 4x, $p 4y, $yellow);

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Imageline ($im, $p 2x, $p 2y, $p 4x, $p 4y, $yellow);

Imageline ($im, $p 2x, $p 2y, $p 5x, $p 5y, $yellow);

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Panax Notoginseng imageline ($im, $p 3x, $p 3y, $p 5x, $p 5y, $yellow);

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(' Content-type:image/png ');

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Imagepng ($im);

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Imagedestroy ($im);

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?>

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