» Texteffekte mit PHP: imagettftext mit Verlauf / Farbverlauf

function imagettfgradient($im, $size, $angle, $x, $y, $color, $font, $text, $tcolor, $bcolor=false) {
	// box size
	$box = imagettfbox($size, $angle, $font, $text);
	$width = $box['width'];
	$height = $box['height'];
	// gradient colors
	$tcolor =imagecolorsforindex($im, $tcolor);
	if ($bcolor !== false) {
		$bcolor =imagecolorsforindex($im, $bcolor);
		$steps = array(
			'red' => ($tcolor['red'] - $bcolor['red']) / ($box['height']-1),
			'green' => ($tcolor['green'] - $bcolor['green']) / ($box['height']-1),
			'blue' => ($tcolor['blue'] - $bcolor['blue']) / ($box['height']-1)
		);
	}
	else {
		$bcolor = $tcolor;
	}
	// make white image with black text
	$im2 = imagecreate($width, $height);
	$white = imagecolorallocate($im2, 255, 255, 255);
	$black = imagecolorallocate($im2, 0, 0, 0); // black must be set as the 2nd color because 0 cant be -0!
	imagefill($im2, 0, 0, $white);
	imagettftext($im2, $size, $angle, $box['left'], $box['top'], -$black, $font, $text);
	// make black text transparent
	imagecolortransparent($im2, $black);
	// make image with gradient background
	$im3 = imagecreate($width, $height);
	for ($i = 0; $i < $height; $i++) {
		imagefilledrectangle($im3, 0, $i, $width, $height, imagecolorallocate($im3, $tcolor['red'], $tcolor['green'], $tcolor['blue']));
		$tcolor = array(
			'red' => $tcolor['red'] - $steps['red'],
			'green' => $tcolor['green'] - $steps['green'],
			'blue' => $tcolor['blue'] - $steps['blue'],
		);
	}
	// merge text and gradient
	imagecopy($im3, $im2, 0, 0, 0, 0, $width, $height);
	imagedestroy($im2);
	// make background transparent
	imagecolortransparent($im3, imagecolorat($im3, 0, $height-1));
	// merge base with gradient text
	imagecopy($im, $im3, $x-$box['left'], $y-$box['top'], 0, 0, $width, $height);
	imagedestroy($im3);
}

// settings
$font = '../fonts/Tuffy.ttf';
$text = 'Programmierer-Forum.de';
$size = 50;
$border = 10;
// image
$box = imagettfbox($size, 0, $font, $text);
$x = $box['left'] + $border;
$y = $box['top'] + $border;
header("Content-type: image/gif");
$width = $box['width']+200;
$height = $box['height']+50;
$im = imagecreate($width, $height);
// colors
$black = imagecolorallocate($im, 0, 0, 0);
$red = imagecolorallocate($im, 255, 0, 0);
$blue = imagecolorallocate($im, 0, 0, 255);
// display text
imagettfgradient($im, $size, 0, $x, $y, $black, $font, $text, $blue, $red);
// display image
imagegif($im);
imagedestroy($im);

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