GDでTTF

gd-ttf.php

<?php
/**
 * GDでTTF
 * @author [email protected]
 */
$fontFile = __DIR__ . DIRECTORY_SEPARATOR . 'yojo.ttf';

$text = (isset($_GET['text'])) ? $_GET['text'] : null;
$fontSize = (isset($_GET['size']) && ctype_digit($_GET['size'])) ? intval($_GET['size']) : null;

if (!isset($text)) {
    $text = 'てスﾄ';
}
if (!isset($fontSize) || $fontSize < 1 || $fontSize > 70) {
    $fontSize = 70;
}

$textAngle = 0;

$padding = $fontSize / 2 + 20;

$boundingBox = imagettfbbox($fontSize, $textAngle, $fontFile, $text);

$minX = min(array($boundingBox[0], $boundingBox[2], $boundingBox[4], $boundingBox[6]));
$maxX = max(array($boundingBox[0], $boundingBox[2], $boundingBox[4], $boundingBox[6]));
$minY = min(array($boundingBox[1], $boundingBox[3], $boundingBox[5], $boundingBox[7]));
$maxY = max(array($boundingBox[1], $boundingBox[3], $boundingBox[5], $boundingBox[7]));

$left = abs($minX) - 1;
$top  = abs($minY) - 1;
$textWidth = $maxX - $minX;
$textHeight = $maxY - $minY;

$imageWidth  = $textWidth  + $padding;
$imageHeight = $textHeight + $padding;

$image = imagecreate($imageWidth, $imageHeight);

$bgColor = imagecolorallocate($image, 0xff, 0xff, 0xff);
$textColor = imagecolorallocate($image, 0x00, 0x00, 0x00);

imagefilledrectangle($image, 0, 0, $imageWidth, $imageHeight, $bgColor);

imagettftext(
    $image,
    $fontSize,
    $textAngle,
    $left + ($imageWidth / 2) - ($textWidth / 2),
    $top + ($imageHeight / 2) - ($textHeight / 2),
    $textColor,
    $fontFile,
    $text
);

header('Content-Type: image/png');
imagepng($image);
imagedestroy($image);