I was viewing the code for calculate the box of a text for a given font but I do not found one that works fine with different angles from zero, so I have made a function simpler than above:
<?php
function calculateTextBox($text,$fontFile,$fontSize,$fontAngle) {
$rect = imagettfbbox($fontSize,$fontAngle,$fontFile,$text);
$minX = min(array($rect[0],$rect[2],$rect[4],$rect[6]));
$maxX = max(array($rect[0],$rect[2],$rect[4],$rect[6]));
$minY = min(array($rect[1],$rect[3],$rect[5],$rect[7]));
$maxY = max(array($rect[1],$rect[3],$rect[5],$rect[7]));
return array(
"left" => abs($minX),
"top" => abs($minY),
"width" => $maxX - $minX,
"height" => $maxY - $minY,
"box" => $rect
);
}
?>
With this function you can center an angled string in any image:
<?php
$mystring = "Hello world!";
$imgWidth = 300;
$imgHeight = 150;
$image = imagecreate($imgWidth,$imgHeight);
imagefill($image,imagecolorallocate($image,200,200,200));
$box = calculateTextBox($mystring,"./Verdana.ttf",15,45);
$color = imagecolorallocate($image,0,0,0);
imagettftext($image,
15,
45,
$box["left"] + ($imgWidth / 2) - ($box["width"] / 2),
$box["top"] + ($imgHeight / 2) - ($box["height"] / 2),
$color,
"./Verdana.ttf",
$mystring);
header("Content-Type: image/x-png");
imagepng($im);
imagedestroy($im);
?>
