/**
* Generates the background grid.png
*
* @author Anthony Short
* @param $cl Column width
* @param $bl Baseline
* @param $gw Gutter Width
* @return null
*/
private static function create_grid_image($cw, $bl, $lgw, $rgw, $file)
{
if (!file_exists($file)) {
$image = ImageCreate($cw + $lgw + $rgw, $bl);
$colorWhite = ImageColorAllocate($image, 255, 255, 255);
$colorGrey = ImageColorAllocate($image, 200, 200, 200);
$colorBlue = ImageColorAllocate($image, 240, 240, 255);
# Draw left gutter
Imagefilledrectangle($image, 0, 0, $lgw - 1, $bl, $colorWhite);
# Draw column
Imagefilledrectangle($image, $lgw, 0, $cw + $lgw - 1, $bl, $colorBlue);
# Draw right gutter
Imagefilledrectangle($image, $lgw + $cw + 1, 0, $lgw + $cw + $rgw, $bl, $colorWhite);
# Draw baseline
imageline($image, 0, $bl - 1, $lgw + $cw + $rgw, $bl - 1, $colorGrey);
CSScaffold::cache_create(dirname($file));
ImagePNG($image, $file);
# Kill it
ImageDestroy($image);
}
}
