效果:
代码:
$width = 600;$height = 650;header("Content-type: image/gif");$img = imagecreate($width, $height);$bg_color = imagecolorallocate($img, 0, 0, 0);$red = imagecolorallocate($img, 255, 0, 0);for ($i = 0; $i <= 100; $i++) {for ($j = 0; $j <= 100; $j++) {$r = M_PI / 50 * $i * (1 - sin(M_PI / 50 * $j)) * 40;$x = $r * cos(M_PI / 50 * $j) * sin(M_PI / 50 * $i) + $width / 2;$y = -$r * sin(M_PI / 50 * $j) + $height / 6;imagesetpixel($img, $x, $y, $red);}}imagegif($img);imagedestroy($img);exit;