GD library imagettftext function not working
Wednesday, 27th January 2010
by idrees
I'm using GD library to draw curvy text on image. It works fine if i use imagestring function. but i need to apply fonts, which means i need to use imagettftext function but the problem i'm facing when i use imagettftext function i get blank image. here is my function which returns image. Please tell me where i'm wrong and how to fix it.
function DrawTextArc($str, $aStart, $aEnd, $iRadius, $bCCW, $fontFile, $colorNumber, $textsizeValue){
$nFont = $textsizeValue ;
list($colorR,$colorG,$colorB) = hex2rgb($colorNumber,false);
// create image to store each character
$xFont = imagefontwidth($nFont);
$yFont = imagefontheight($nFont);
$imgChar = imagecreatetruecolor($xFont, $yFont);
// create overall image
$iCentre = $iRadius + max($xFont, $yFont);
$img = imagecreatetruecolor(2 * $iCentre, 2 * $iCentre);
imagealphablending($img, false);
imagesavealpha($img,true);
$transparent = imagecolorallocatealpha($img, $colorR,$colorG,$colorB, 127);
//$black = imagecolorallocate($img, 0, 0, 0);
//imagecolortransparent($img, $black);
//$red = imagecolorallocate($img, 255, 0, 0);
// sort out colours
//$colBG = imagecolorallocate($img, 255, 255, 255);
imagealphablending($imgChar, false);
imagesavealpha($imgChar,true);
$transparent2 = imagecolorallocatealpha($imgChar, $colorR,$colorG,$colorB, 127);
//$colFGchar = imagecolorallocate($imgChar, 0, 0, 0);
//imagecolortransparent($imgChar, $colFGchar);
//$colRed = imagecolorallocate($imgChar, 255, 0, 0);
$textColor = imagecolorallocate($imgChar,$colorR,$colorG,$colorB );
imagefilledrectangle($img, 0, 0, 2 * $iCentre, 2 * $iCentre, $transparent);
// arrange angles depending on direction of rotation
if ($bCCW){
while ($aEnd < $aStart){
$aEnd += 360;
}
}else{
while ($aEnd > $aStart){
$aEnd -= 360;
}
}
$len = strlen($str);
$font = "fonts/".$fontFile;
// draw each character individually
for ($i = 0; $i < $len; $i++)
{
// calculate angle along arc
$a = ($aStart * ($len - 1 - $i) + $aEnd * $i) / ($len - 1);
// draw individual character
imagefilledrectangle($imgChar, 0, 0, $xFont, $yFont,$transparent2);
imagettftext($imgChar, 18, 0, 11, 21, $textColor, 'fonts/times.ttf', $str[$i]); //not working
// imagestring($imgChar, $nFont, 0, 0, $str[$i], $textColor); //working
// rotate character
$imgTemp = imagerotate($imgChar, (int)$a + 90 * ($bCCW ? 1 : -1), $transparent2);
$xTemp = imagesx($imgTemp);
$yTemp = imagesy($imgTemp);
// copy to main image
imagecopy($img, $imgTemp,
$iCentre + $iRadius * cos(deg2rad($a)) - ($xTemp / 2),
$iCentre - $iRadius * sin(deg2rad($a)) - ($yTemp / 2),
0, 0, $xTemp, $yTemp);
}
return $img;
}
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