GD library imagettftext funtion help

[medriis]

i'm using GD library 2.0.34 with php 5.2.6 to create image with text. when i use imagettftext function to apply ttf file, then GD generates blank image. but same code is working fine with imagestring function. Please can somebody tell me where is problem. here is code

 

$len = strlen($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, $nFont, 0, 0, 0, $textColor, $font,$str[$i]); // not working

              // imagestring($imgChar, $nFont, 0, 0, $str[$i], $textColor);  //working fine

                // 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;