Famous Internet Programmer

Dear Friends,
I am a structural engineer. I am using php for developing a program for civil engineers.
I just want to know how can I draw a sketch or line diagram in php ?

Thanks in advance

I use this code and it works. but it needs gw libraries:

<?

header("Content-type: image/png");

$imgWidth=300;

$imgHeight=300;

// Create image and define colors

$image=imagecreate($imgWidth, $imgHeight);

$colorWhite=imagecolorallocate($image, 255, 255, 255);
$colorBlack=imagecolorallocate($image, 0, 0, 0);

$colorGrey=imagecolorallocate($image, 192, 192, 192);

$colorBlue=imagecolorallocate($image, 0, 0, 255);
$colorDarkBlue=imagecolorallocate($image, 51, 51, 204);
$colorLightBlue=imagecolorallocate($image, 0, 187, 255);

// Create border around image

imageline($image, 0, 0, 0, 249, $colorGrey);

imageline($image, 0, 0, 299, 0, $colorGrey);

imageline($image, 299, 0, 299, 249, $colorGrey);

imageline($image, 0, 249, 299, 249, $colorGrey);

// Create grid
/*

for ($i=1; $i<3; $i++){

imageline($image, $i*25, 0, $i*25, 250, $colorGrey);

imageline($image, 0, $i*25, 250, $i*25, $colorGrey);

}
*/
// Create line graph

for ($i=1; $i<=3; $i++){

imagefilledrectangle($image, $i*75, 100, $i*75+25, 250, $colorDarkBlue);

imagefilledrectangle($image, ($i*75)+1, 100, ($i*75+25)-5, 248, $colorLightBlue);

if($i == 1)
imagestring($image, 12, $i*75-2, 275, "good", $colorBlack);
if($i == 2)
imagestring($image, 12, $i*75-3, 275, "middle", $colorBlack);
if($i == 3)
imagestring($image, 12, $i*75-2, 275, "bad", $colorBlack);

}

// Output graph and clear image from memory

imagepng($image);

imagedestroy($image);

?>

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