php画图实例

<?php 
// by MoreWindows
$imgWidth = 600; 
$imgHeight = 400; 
$img = imagecreatetruecolor($imgWidth, $imgHeight); 
imagefill($img, 0, 0, imagecolorallocate($img, 240, 240, 240));//设置底色 
$snowflake_size = 30; 
$font_file = "c:\\WINDOWS\\Fonts\\simhei.ttf";  
//生成大雪花 其实就是调用imagettftext()输出*号 
for ($i=1; $i<=400; $i++)  
{ 
    $font_color = imagecolorallocate($img, mt_rand(100,200), mt_rand(100,200), mt_rand(100,200)); 
    imagettftext($img, $snowflake_size, mt_rand(0, 180), mt_rand(0, $imgWidth),mt_rand(0, $imgHeight), $font_color, $font_file, "□");  
} 
//水印文字 
$black_color = imagecolorallocate($img, 0, 0, 0); 
imagettftext($img, 12, 0, $imgWidth - 50 , $imgHeight - 20, $black_color, $font_file, "PHP画图"); 
imagepng($img); 
imagedestroy($img); 
?>