imagettfbbox

(PHP 4, PHP 5, PHP 7)

imagettfbbox — 取得使用 TrueType 字体的文本的范围

说明

array imagettfbbox ( float $size , float $angle , string $fontfile , string $text )

本函数计算并返回一个包围着 TrueType 文本范围的虚拟方框的像素大小。

size: 像素单位的字体大小。
angle: text 将被度量的角度大小。
fontfile: TrueType 字体文件的文件名（可以是 URL）。根据 PHP 所使用的 GD 库版本，可能尝试搜索那些不是以 '/' 开头的文件名并加上 '.ttf' 的后缀并搜索库定义的字体路径。
text: 要度量的字符串。

imagettfbbox() 返回一个含有 8 个单元的数组表示了文本外框的四个角：

0	左下角 X 位置
1	左下角 Y 位置
2	右下角 X 位置
3	右下角 Y 位置
4	右上角 X 位置
5	右上角 Y 位置
6	左上角 X 位置
7	左上角 Y 位置

这些点是相对于文本的而和角度无关，因此"左上角"指的是以水平方向看文字时其左上角。

本函数同时需要 GD 库和 FreeType 库。

参见 imagettftext()。

User Contributed Notes

james dot heazlewood at crownbet com au 20-Feb-2017 04:21


I found the bounding boxes a bit tricky to use when trying to rotate AND align text boxes. I wrote this function allows you to set left, right or center aligned text and also rotate it.



<?php

  /**

   * Renders rotate-able and align-able text of any font or colour

   * 

   * @param resource $img Image resource

   * @param string $text

   * @param int $x

   * @param int $y

   * @param int $fontSize

   * @param string $fontFile Full path to font file

   * @param array $color Red, green, blue values in either int (255) or hex (0xFF)

   * @param string $align Accept 'left', 'right', and defaults to center

   * @return void

   */

  function gd_text_aligned($img, $text, $x, $y, $fontSize, $fontFile, $color = [0, 0, 0], $align = 'left') {



      // Create colour Resource

      $textColor = imagecolorallocate($img, $color[0], $color[1], $color[2]);



      // Create bounding box co-ordinates

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

      $textBox = imagettfbbox($fontSize, 0, $fontFile, $text);



      //  Bounding box array key meanings

      //

      //  $bBox[0] = lower left  X

      //  $bBox[1] = lower left  Y

      //  $bBox[2] = lower right X

      //  $bBox[3] = lower right Y

      //  $bBox[4] = upper right X

      //  $bBox[5] = upper right Y

      //  $bBox[6] = upper left  X

      //  $bBox[7] = upper left  Y

      //

      //     6,7     |     4,5

      //        -----+-----

      //     0,1     |     2,3

      //

      $boundingBoxWidth = $boundingBox[4] - $boundingBox[0];

      $boundingBoxHeight = $boundingBox[5] - $boundingBox[1];

      $flatHeight = $textBox[5] - $textBox[1]; 



      // Align left right or centred?

      if($align == 'left') {

          $drawX = $x - sin($rotation * M_PI / 180) * ($flatHeight / 2);

          $drawY = $y - cos($rotation * M_PI / 180) * ($flatHeight / 2);

      } else if($align == 'right') {

          $drawX = $x - $boundingBoxWidth + sin($rotation * M_PI / 180) * ($flatHeight / 2);

          $drawY = $y - $boundingBoxHeight + cos($rotation * M_PI / 180) * ($flatHeight / 2);

      } else {

          // no alignment (centred)

          $drawX = $x - $boundingBoxWidth / 2;

          $drawY = $y - $boundingBoxHeight / 2;

      }

      

      // draw text

      imagettftext(

          $img,

          $fontSize,

          $rotation, $drawX, $drawY,

          $textColor, $fontFile, $text

      );

      

    }

tuxedobob 04-Nov-2016 01:02


You might save yourself a lot of time and headache if you remember that the bold version of a font is NOT necessarily the same height as the regular version of that font!



(In fact, it can be shorter!)

gw at example dot com 19-Jan-2016 02:32


a little something to replace in blackbart tip :



// start scanning (0=> black => empty) 

  $rleft  = $w4 = $width<<2; 

  $rright = 0; 

  $rbottom   = 0; 

  $rtop = $h4 = $height<<2; 

  for( $x = 0; $x < $w4; $x++ ) 

    for( $y = 0; $y < $h4; $y++ ) 

      if( imagecolorat( $img, $x, $y ) ){ 

        $rleft   = min( $rleft, $x ); 

        $rright  = max( $rright, $x ); 

        $rtop    = min( $rtop, $y ); 

        $rbottom = max( $rbottom, $y ); 

      } 



with



// start scanning (0=> black => empty) 

  $break = false;

  $rleft  = $w4 = $width<<2; 

  $rright = 0; 

  $rbottom   = 0; 

  $rtop = $h4 = $height<<2; 

  // scanning from left to right, breaking when a pixel is found, to scan from the other side : avoid scanning all pixels !

  for($x=0; $x<$w4; $x++){

    for($y=0; $y<$h4; $y++)

      if(imagecolorat($img,$x,$y)){

        $rtop = min($rtop, $y); $rleft = min($rleft, $x);

        $break = true; break;

      }

    if($break) break;

  }

  // scanning from right to left, breaking when a pixel is found

  for($x=($w4-1); $x>$rleft; $x--){

    for($y=0; $y<$h4; $y++)

      if(imagecolorat($img,$x,$y)){

          $rright = max($rright, $x); $rbottom = max($rbottom, $y);

        $break = true; break;

      }

    if($break) break;

  }

//... //



it may be even better to check if the picture is portrait or landscape, to start the loops from left-right(landscape) or top-bottom (portrait)

indraaaa34 at gmail dot com 07-May-2015 09:49


The returned array order is like this:

-----------------------------

| X:4  Y:5      | X:   Y:7        |

-----------------------------

| X:0  Y:1      | X:2  Y:3       |

-----------------------------



eg:

4 for the upper left X 

5 for the upper left Y and so on.

user107 01-Apr-2015 12:36


I found a simple solution that was working for me:



 <?php

    if(!isset($_GET['size'])) $_GET['size'] = 44;

    if(!isset($_GET['text'])) $_GET['text'] = "Hello, world!";



    $size = imagettfbbox($_GET['size'], 0, "ARIAL", $_GET['text']);

    $xsize = abs($size[0]) + abs($size[2]);

    $ysize = abs($size[5]) + abs($size[1]);



    $image = imagecreate($xsize, $ysize);

    $blue = imagecolorallocate($image, 0, 0, 255);

    $white = ImageColorAllocate($image, 255,255,255);

    imagettftext($image, $_GET['size'], 0, abs($size[0]), abs($size[5]), $white, "ARIAL", $_GET['text']);



    header("content-type: image/png");

    imagepng($image);

    imagedestroy($image);

?> 



Here is the link with a examples:

http://www.tuxradar.com/practicalphp/11/2/6#null

rasmus at mindplay dot dk 11-Apr-2013 10:33


It should be noted that the bounding box coordinates returned by this function are inaccurate - bug reports about this have been open for 5 years, so expect this will likely never be fixed. 



More information here:



https://gist.github.com/mindplay-dk/4429153

go4christian at gmail dot com 01-Aug-2012 12:02


Automatic line breaks: This simple function is able automatically create line breaks if you want to write a text on an image. All you have to specify is a maximum length.





<?php


function write_multiline_text($image, $font_size, $color, $font, $text, $start_x, $start_y, $max_width) 


{


        //split the string


        //build new string word for word


        //check everytime you add a word if string still fits


        //otherwise, remove last word, post current string and start fresh on a new line


        $words = explode(" ", $text);


        $string = "";


        $tmp_string = "";


        


        for($i = 0; $i < count($words); $i++)


        {


            $tmp_string .= $words[$i]." ";


            


            //check size of string


            $dim = imagettfbbox($font_size, 0, $font, $tmp_string);


            


            if($dim[4] < $max_width)


            {


                $string = $tmp_string;


            } else {


                $i--;


                $tmp_string = "";


                imagettftext($image, 11, 0, $start_x, $start_y, $color, $font, $string);


                


                $string = "";


                $start_y += 22; //change this to adjust line-height. Additionally you could use the information from the "dim" array to automatically figure out how much you have to "move down"


            }


        }


                                


        imagettftext($image, 11, 0, $start_x, $start_y, $color, $font, $string); //"draws" the rest of the string


?>

magnum dot tc dot mr at gmail dot com 08-Jun-2012 07:50


Please note that the 3rd argument is really a "path". 


<?php


imagettfbbox(10, 0, 'arial.ttf', 'Hello, World!');  // will result in "Warning: imagettfbbox(): Could not find/open font in ...php on line ..."


?>





use instead something like this:


<?php imagettfbbox(10, 0, './arial.ttf', 'Hello, World!'); ?>


or


<?php imagettfbbox(10, 0, getcwd().'/arial.ttf', 'Hello, World!'); ?>

Anonymous 04-May-2012 10:29


It seems to be worth pointing out that the "points" unit GD2 is using corresponds to 96 dpi, as defined in gd.h:

#define GD_RESOLUTION           96      /* pixels per inch */



So if you want to translate the bbox back to font points, you need to multiply all coordinates by 72/96 = 3/4.

jodybrabec at gmail dot com 31-Aug-2011 12:39


Very CLEAR version of func., with example....





<?php





function calculateTextBox($text,$fontFile,$fontSize,$fontAngle) {


    /************


    simple function that calculates the *exact* bounding box (single pixel precision). 


    The function returns an associative array with these keys: 


    left, top:  coordinates you will pass to imagettftext 


    width, height: dimension of the image you have to create 


    *************/


    $rect = imagettfbbox($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) - 1,


     "top"    => abs($minY) - 1,


     "width"  => $maxX - $minX,


     "height" => $maxY - $minY,


     "box"    => $rect


    );


}





// Example usage - gif image output





$text_string    = "Hullo World";


$font_ttf        = "./fonts/arial.ttf";


$font_size        = 22;


$text_angle        = 0;


$text_padding    = 10; // Img padding - around text





$the_box        = calculateTextBox($text_string, $font_ttf, $font_size, $text_angle);





$imgWidth    = $the_box["width"] + $text_padding;


$imgHeight    = $the_box["height"] + $text_padding; 





$image = imagecreate($imgWidth,$imgHeight);


imagefill($image, imagecolorallocate($image,200,200,200));





$color = imagecolorallocate($image,0,0,0);


imagettftext($image,


    $font_size,


    $text_angle,


    $the_box["left"] + ($imgWidth / 2) - ($the_box["width"] / 2),


    $the_box["top"] + ($imgHeight / 2) - ($the_box["height"] / 2),


    $color,


    $font_ttf,


    $text_string);





header("Content-Type: image/gif");


imagegif($image);


imagedestroy($image);





?>





[ remember: No spaces before or after the <?php ... ?> tag, because of header() call, you Roast! ]

phpcity at phpcountry dot net 18-May-2011 03:21


I could in no way reproduce this function's example if I was to use any accented letter.



Replacing imagecreatetruecolor by imagecreate worked correctly with accents.

Andrey Zakharov 05-Jan-2011 12:16


For mixed text drawing on image, height given by this function is useless and leads to text's hip-hops over the baseline .



I will use just this:

<?php

$size = 12;//font height

$font = 'Arial';// your font

$char = 'Test';

$char = 'With W';

$char = 'without w but with p and y and q';



    $rect = imagettfbbox($size, 0, $font, $char);



    $image_height =abs( $rect[7] );//do no respect bottom margin

    $imw = $rect[2] - $rect[0]; //as usual

    $bx = abs( $rect[ 0 ] ); // X offset 

    $by = $size * 1.25; // Y offset - we will use const LINEHEIGHT

?>

a2hansolo at gmail dot com 23-Dec-2010 08:29


measure bg image size, wrap text to fit image width





<?php


$mx = imagesx($main_img);


$my = imagesy($main_img);





//TEXT VARS/////////


$main_text = ;


$main_text_size = ;


$main_text_x = ($mx/2);





$main_text_color = imagecolorallocate($main_img, $main_text_red, $main_text_green, $main_text_blue);


$words = explode(' ', $main_text);


$lines = array($words[0]); 


$currentLine = 0;


    for($i = 1; $i < count($words); $i++)


    {


        $lineSize = imagettfbbox($main_text_size, 0, $mt_f, $lines[$currentLine] . ' ' . $words[$i]);


        if($lineSize[2] - $lineSize[0] < $mx)


        {


            $lines[$currentLine] .= ' ' . $words[$i];


        }


        else


        {


            $currentLine++;


            $lines[$currentLine] = $words[$i];


        } 


    }


$line_count = 1;


// Loop through the lines and place them on the image


foreach ($lines as $line)


{


    $line_box = imagettfbbox($main_text_size, 0, $mt_f, "$line");


    $line_width = $line_box[0]+$line_box[2];


    $line_height = $line_box[1]-$line_box[7];


    $line_margin = ($mx-$line_width)/2;


    $line_y = (($line_height+12) * $line_count);


    imagettftext($main_img, $main_t_s, 0, $line_margin, $line_y, $main_text_color, $mt_f, $line);





    // Increment Y so the next line is below the previous line


    $line_count ++;


}


?>

blackbart at simail dot it 15-Apr-2010 08:12


I wrote a simple function that calculates the *exact* bounding box (single pixel precision).


The function returns an associative array with these keys:


left, top:  coordinates you will pass to imagettftext 


width, height: dimension of the image you have to create





<?php


function calculateTextBox($font_size, $font_angle, $font_file, $text) {


  $box   = imagettfbbox($font_size, $font_angle, $font_file, $text);


  if( !$box )


    return false;


  $min_x = min( array($box[0], $box[2], $box[4], $box[6]) );


  $max_x = max( array($box[0], $box[2], $box[4], $box[6]) );


  $min_y = min( array($box[1], $box[3], $box[5], $box[7]) );


  $max_y = max( array($box[1], $box[3], $box[5], $box[7]) );


  $width  = ( $max_x - $min_x );


  $height = ( $max_y - $min_y );


  $left   = abs( $min_x ) + $width;


  $top    = abs( $min_y ) + $height;


  // to calculate the exact bounding box i write the text in a large image


  $img     = @imagecreatetruecolor( $width << 2, $height << 2 );


  $white   =  imagecolorallocate( $img, 255, 255, 255 );


  $black   =  imagecolorallocate( $img, 0, 0, 0 );


  imagefilledrectangle($img, 0, 0, imagesx($img), imagesy($img), $black);


  // for sure the text is completely in the image!


  imagettftext( $img, $font_size,


                $font_angle, $left, $top,


                $white, $font_file, $text);


  // start scanning (0=> black => empty)


  $rleft  = $w4 = $width<<2;


  $rright = 0;


  $rbottom   = 0;


  $rtop = $h4 = $height<<2;


  for( $x = 0; $x < $w4; $x++ )


    for( $y = 0; $y < $h4; $y++ )


      if( imagecolorat( $img, $x, $y ) ){


        $rleft   = min( $rleft, $x );


        $rright  = max( $rright, $x );


        $rtop    = min( $rtop, $y );


        $rbottom = max( $rbottom, $y );


      }


  // destroy img and serve the result


  imagedestroy( $img );


  return array( "left"   => $left - $rleft,


                "top"    => $top  - $rtop,


                "width"  => $rright - $rleft + 1,


                "height" => $rbottom - $rtop + 1 );


}


?>

peterjwest3 at gmail dot com 08-Apr-2010 03:18


As many of you know, this function is bugged in several versions of PHP. It should return the coordinates relative to the baseline of the font. So if your text includes characters like g and p then the bounding box should extend below zero on the Y axis, however it doesn't. This is a problem because imagettftext() positions text using the baseline, so all your text will be misaligned.



My solution is to create an image of the desired font and font-size using all ascii characters with imagettfbbox() and imagettftext(). The height of this image is used as the height for the real image.



I then analyse the image to get the vertical offset of the text (the background color should be $baseColor)

<?php

function getYOffset($image, $baseColor) {

    for($y = 0; $y < $this->height(); $y++)

        for($x = 0; $x < $this->width(); $x++)

            if (imagecolorat($image, $x, $y) !== $baseColor) 

                return $y; }

?>



This offset can be used as the baseline for the font (for this font-size). You can use a similar trick for the horizontal offset, but that changes depending on the first character.

hkc@taiwan 22-Aug-2009 09:57


I want to output a bounding box of a text as an image straightly. I did like this:



<?php



$text = "<?php echo \"hello, world\"; ?>";

$font = "./arial.ttf";

$size = "60";



$bbox = imagettfbbox($size, 0, $font, $text);



$width = abs($bbox[2] - $bbox[0]);

$height = abs($bbox[7] - $bbox[1]);



$image = imagecreatetruecolor($width, $height);



$bgcolor = imagecolorallocate($image, 255, 255, 255);

$color = imagecolorallocate($image, 0, 0, 0);



$x = $bbox[0] + ($width / 2) - ($bbox[4] / 2);

$y = $bbox[1] + ($height / 2) - ($bbox[5] / 2);



imagefilledrectangle($image, 0, 0, $width - 1, $height - 1, $bgcolor);

imagettftext($image, $size, 0, $x, $y, $color, $font, $text);



$last_pixel= imagecolorat($image, 0, 0);



for ($j = 0; $j < $height; $j++)

{

    for ($i = 0; $i < $width; $i++)

    {

        if (isset($blank_left) && $i >= $blank_left)

        {

            break;

        }



        if (imagecolorat($image, $i, $j) !== $last_pixel)

        {

            if (!isset($blank_top))

            {

                $blank_top = $j;

            }

            $blank_left = $i;

            break;

        }



        $last_pixel = imagecolorat($image, $i, $j);

    }

}



$x -= $blank_left;

$y -= $blank_top;



imagefilledrectangle($image, 0, 0, $width - 1, $height - 1, $bgcolor);

imagettftext($image, $size, 0, $x, $y, $color, $font, $text);



header('Content-type: image/png');

imagepng($image);

imagedestroy($image);



?>

alvaro at demogracia dot com 22-May-2009 12:35


If $fontfile is a Windows UNC path, it *must* start with //SERVER rather than \\SERVER:



<?php

imagettfbbox(10, 0, '\\\\server\\path\\file.ttf', 'Hello, World!'); // Warning: imagettfbbox() [http://es.php.net/function.imagettfbbox]: Could not find/open font 

?>

Dario 06-May-2009 04:09


My solution to below-baseline characters is to simply apply a smaller angle and some padding when calculating your boundaries, so the function thinks your text goes below baseline. For example: 





<?php


// GET BOUNDS OF TEXT


$bounds = imagettfbbox($size*1.05, $angle-3, $font, $text);


?>

Anonymous 06-Nov-2008 08:18


SIMPLE OVERLOADED FUNCTION: Adds TTF Center and Right Alignment to co ordintate points.


Correctly demonstrates the use of the bouning box TTF function and the array of coordinates that it returns.





After obtaining values and adjusting based on a set of values [L, C, R], it uses simple math based of the length of the text to move it from the origin (x = 0 )





<?php


function imagettftextalign($image, $size, $angle, $x, $y, $color, $font, $text, $alignment='L')


{





   //check width of the text


   $bbox = imagettfbbox ($size, $angle, $font, $text);


   $textWidth = $bbox[2] - $bbox[0];


   switch ($alignment) {


       case "R":


           $x -= $textWidth;


           break;


       case "C":


           $x -= $textWidth / 2;


           break;


   }





   //write text


   imagettftext ($image, $size, $angle, $x, $y, $color, $font, $text);





}


?>

decimealgo at gmail dot com 04-Oct-2008 07:11


This is a function which reformats a text string into a text block of a given width.


Usefull when you have a long single line string and want to fit it into a fixed width but don't care about it's height





<?php


function makeTextBlock($text, $fontfile, $fontsize, $width)


{    


    $words = explode(' ', $text);


    $lines = array($words[0]);


    $currentLine = 0;


    for($i = 1; $i < count($words); $i++)


    {


        $lineSize = imagettfbbox($fontsize, 0, $fontfile, $lines[$currentLine] . ' ' . $words[$i]);


        if($lineSize[2] - $lineSize[0] < $width)


        {


            $lines[$currentLine] .= ' ' . $words[$i];


        }


        else


        {


            $currentLine++;


            $lines[$currentLine] = $words[$i];


        }


    }


    


    return implode("\n", $lines);


}


?>

beosman at gmail dot com 22-Aug-2008 06:00


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);



?>

Stefan at colulus dot com 30-May-2008 08:13


I worked out a script that allows the transfer of alphanumeric data to be placed on an image. The HTML feature is img src and the php feature is imagettftext. This simple code will increment from 1 to 3 on images.



code:



<?php

//ImageCall.php -- This script will call a script to produce the image.

for($next = 1;$next < 4; $next++){

print "Image $next:<br>";

print "<img src = 'Image.php?\$text=$next'>";

print "<br><br>";

}

?>



<?php

//Image.php -- This script creates a square image and places the text on it.



// image size and color

$im = ImageCreate(77,77);

$color1 = ImageColorAllocate($im,0x66,0xCC,0x00);

$color2 = ImageColorAllocate($im,0x33,0x66,0x00);

$color3 = ImageColorAllocate($im,0x00,0x99,0x00);

$color4 = ImageColorAllocate($im,0x3D,0x3D,0x3D);



// image creation

ImageFilledRectangle($im,1,1,76,76,$color1);

ImageFilledpolygon($im, array (76,1,1,76,76,76),3,$color2);

ImageFilledRectangle($im,5,5,72,72,$color3);



// determine numeric center of image

$size = ImageTTFBBox(45,0,'impact',$_GET['$text']);

$X = (77 - (abs($size[2]- $size[0])))/2;

$Y = ((77 - (abs($size[5] - $size[3])))/2 + (abs($size[5] - $size[3])));



//places numeric information on image

ImageTTFText($im,45,0,($X-1),$Y,$color4,'impact',$_GET['$text']);



//returns completed image to calling script

Header('Content-Type: image/png');

Imagepng($im);



?>

Valentijn de Pagter 16-May-2008 07:14


If you're looking for easy text alignment, you need to use the imagettfbbox() command. When given the correct parameters, it will return the boundaries of your to-be-made text field in an array, which will allow you to calculate the x and y coordinate that you need to use for centering or aligning your text.



A horizontal centering example:



<?php



$tb = imagettfbbox(17, 0, 'airlock.ttf', 'Hello world!');



?>



$tb would contain:



Array

(

    [0] => 0 // lower left X coordinate

    [1] => -1 // lower left Y coordinate

    [2] => 198 // lower right X coordinate

    [3] => -1 // lower right Y coordinate

    [4] => 198 // upper right X coordinate

    [5] => -20 // upper right Y coordinate

    [6] => 0 // upper left X coordinate

    [7] => -20 // upper left Y coordinate

)



For horizontal alignment, we need to substract the "text box's" width { $tb[2] or $tb[4] } from the image's width and then substract by two.



Saying you have a 200px wide image, you could do something like this:



<?php



$x = ceil((200 - $tb[2]) / 2); // lower left X coordinate for text

imagettftext($im, 17, 0, $x, $y, $tc, 'airlock.ttf', 'Hello world!'); // write text to image



?>



This'll give you perfect horizontal center alignment for your text, give or take 1 pixel. Have fun!

mihai.draghicioiu at gmailcom 15-Apr-2008 12:57


To get the height for a line of text, I've found it useful to do:



<?php



$bbox = imagettfbbox($size, 0, $ttf, " \n "); // space, newline, space



$height = $bbox[3] - $bbox[5];



?>



I hope this helps. Before, I used the string "Tj", but that sometimes fell short, especially for crazy fonts.

heshan at sjtu dot edu dot cn 07-Jan-2008 01:18


the imagettfbbox and imagettftext quirks are:



1. imagettfbbox and imagettftext have the same return value and both of them are wrong for angle not equal to zero.

2. imagettfbbox returns the correct bounding box when angle is zero.

3. the bounding box has a coordinate system that the x gets bigger from left to right and y gets bigger from top to bottom.

4. the "base point" used in imagettftext is the origin in the bounding box coordinate system.

5. when the angle is other than 0, it is actually rotated in the coordinate system with respect to the base point. so if we know the bounding box coordinate when angle is zero, we can get the new bounding box coordinate by doing the rotation by math equations manually.

6. to have pixel level accuracy, we should also be aware of another thing. suppose the axis is like this: |_|_|_|, the bounding box coordinate uses point on the vertical line while image function uses point on the horizontal line, so there is a 1 pixel difference you should take care of.



The following snippet creates minimal images containing a letter of different font and rotation angle. This is especially useful in captcha scripts.



<?php



function create_font_image( $size, $angle, $font, $char )

{

    $rect = imagettfbbox( $size, 0, $font, $char );

    if( 0 == $angle ) {

        $imh = $rect[1] - $rect[7];

        $imw = $rect[2] - $rect[0];

        $bx = -1 - $rect[0];

        $by = -1 - $rect[7];

    } else {

        $rad = deg2rad( $angle );

        $sin = sin( $rad );

        $cos = cos( $rad );

        if( $angle > 0 ) {

            $tmp = $rect[6] * $cos + $rect[7] * $sin;

            $bx = -1 - round( $tmp );

            $imw = round( $rect[2] * $cos + $rect[3] * $sin - $tmp );

            $tmp = $rect[5] * $cos - $rect[4] * $sin;

            $by = -1 - round( $tmp );

            $imh = round( $rect[1] * $cos - $rect[0] * $sin - $tmp );

        } else {

            $tmp = $rect[0] * $cos + $rect[1] * $sin;

            $bx = -1 - round( $tmp );

            $imw = round( $rect[4] * $cos + $rect[5] * $sin - $tmp );

            $tmp = $rect[7] * $cos - $rect[6] * $sin;

            $by = -1 - round( $tmp );

            $imh = round( $rect[3] * $cos - $rect[2] * $sin - $tmp );

        }

    }

    $im = imagecreatetruecolor( $imw, $imh );

    imagefill( $im, 0, 0, imagecolorallocate( $im, 255, 0, 255 ) );

    imagettftext( $im, $size, $angle, $bx, $by, imagecolorallocate( $im, 0, 0, 0 ), $font, $char );

    imagegif( $im, trim( $font, './' ) . ord( $char ) . $angle . '.gif' );

    imagedestroy( $im );

}



$chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890';

$angles = array( -30, -20, -10, 0, 10, 20, 30 );

$fonts = array( './latinwide.ttf', './verdana.ttf', './times.ttf', './broadway.ttf' );

foreach( $angles as $angle )

    foreach( $fonts as $font )

        for( $i = 0; $i < strlen( $chars ); ++$i )

            create_font_image( 100, $angle, $font, $chars[$i] );

?>

intuz et gmx dt de 30-Aug-2007 08:45


I still got problems trying to rotate imagettftext using imagettfbbox.



It's position calculation is mostly wrong. So i tried to rotate ttftext with IMAGEROTATE. 



As a special the result is in black fontcolor and transparent background.



Hope it helps sombody (thanks for function convertBoundingBox, reading below)



<?

function ImgText($text,$fontsize,$font,$angle){

$im = '';

    if($text){

        if(!$fontsize || $fontsize < 1) $fontsize = 12;

        if(!$font) $font = "fonts/arial.ttf";

        $bbox = imagettfbbox($fontsize, 0, $font, $text);

        $size=convertBoundingBox($bbox);

        $im = ImageCreatetruecolor($size['width'],$size['height']);



        $white = ImageColorAllocate($im, 255, 255, 255);

        $black = ImageColorAllocate($im, 0,0,0);

        

        imagefill ($im, 0, 0, $white );

        imagettftext($im, $fontsize, 0, $size['xOffset'], $size['yOffset'], $black, $font, $text);

        $im = imagerotate( $im,$angle, $white);

        imagecolortransparent ($im,$white);

    }else{

        // No text

    }

}

?>

bushj at rpi dot edu 11-Jul-2007 06:11


Apparently the bounding box returned by imagettftext and imagettfbbox is not the same, and it appears as though imagettftext does a better job at calculating the actual bounding box (maybe because it has to render every character and it then finds out really everywhere it rendered).



So, you can create a dummy image render the text to it and get a better box. Here is an example function:

<?php

function better_imagettfbbox($size, $angle, $font, $text) {

  $dummy = imagecreate(1, 1);

  $black = imagecolorallocate($dummy, 0, 0, 0);

  $bbox = imagettftext($dummy, $size, $angle, 0, 0, $black, $font, $text);

  imagedestroy($dummy);

  return $bbox;

}

?>

If you use this a lot, it would be better to keep one dummy image instead of continually creating and destroying images.

Ruquay 04-Jun-2007 01:12


Several comments show that the output of this function is often not what is expected, especially when the text is rotated.



For those of you who'd like a visual representation of what is happening to the bounding box as the text is rotated, take a look here:



http://ruquay.com/sandbox/imagettf/

Nate Sweet 01-Jun-2007 09:11


An improvement to the convertBoundingBox function. The previous function was completely wrong. My confusion came from characters like "1" and "_" that are rendered to the right or below the basepoint (in the font I'm using). I ended up using mike at mikeleigh dot com's function with a fix for these characters, and a "belowBasepoint" value.

<?php

function convertBoundingBox ($bbox) {

    if ($bbox[0] >= -1)

        $xOffset = -abs($bbox[0] + 1);

    else

        $xOffset = abs($bbox[0] + 2);

    $width = abs($bbox[2] - $bbox[0]);

    if ($bbox[0] < -1) $width = abs($bbox[2]) + abs($bbox[0]) - 1;

    $yOffset = abs($bbox[5] + 1);

    if ($bbox[5] >= -1) $yOffset = -$yOffset; // Fixed characters below the baseline.

    $height = abs($bbox[7]) - abs($bbox[1]);

    if ($bbox[3] > 0) $height = abs($bbox[7] - $bbox[1]) - 1;

    return array(

        'width' => $width,

        'height' => $height,

        'xOffset' => $xOffset, // Using xCoord + xOffset with imagettftext puts the left most pixel of the text at xCoord.

        'yOffset' => $yOffset, // Using yCoord + yOffset with imagettftext puts the top most pixel of the text at yCoord.

        'belowBasepoint' => max(0, $bbox[1])

    );

}

?>

Nate Sweet 01-Jun-2007 09:07


It took me some time to make full use of imagettfbbox. Hopefully the following function makes it much easier to use for others.



<?php

function convertBoundingBox ($bbox) {

    if ($bbox[0] >= -1)

        $leftOfBasepoint = -abs($bbox[0] + 1);

    else

        $leftOfBasepoint = abs($bbox[0] + 2);

    $rightOfBasepoint = abs($bbox[2] - $bbox[0]);

    if ($bbox[0] < -1) $rightOfBasepoint = abs($bbox[2]) + abs($bbox[0]) - 1;

    $aboveBasepoint = abs($bbox[5] + 1);

    $height = abs($bbox[7]) - abs($bbox[1]);

    if ($bbox[3] > 0) $height = abs($bbox[7] - $bbox[1]) - 1;

    $width = $leftOfBasepoint + $rightOfBasepoint;

    $belowBasepoint = $height - $aboveBasepoint;

    return array(

        'width' => $width,

        'height' => $height,

        'leftOfBasepoint' => $leftOfBasepoint,

        'rightOfBasepoint' => $rightOfBasepoint,

        'aboveBasepoint' => $aboveBasepoint,

        'belowBasepoint' => $belowBasepoint

    );

}

?>



Thanks goes to mike at mikeleigh dot com for providing the core of this function.



Remember, the basepoint is the x, y coords you use to draw text with imagettftext. A useful thing to do is take a string like...

ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz01234567890

...and use the "aboveBasepoint" value for the height of your font. Now you can draw lines and use "the height of your font * leading" as the distance between lines of text, where leading is a number like 1.45 (for 45% leading).

Nate Sweet 30-May-2007 10:36


This script shows you side by side the difference between a font rendered at a certain size and the same font rendered at some multiple of that size and then scaled down by the same multiple. It seems to help small sizes and affects large ones less. This script lets you see if it is worth implementing for your situation. Included is the great "imagettfbboxextended" function by mike at mikeleigh dot com below.



$size = 30;

$factor = 16;



$smallSize = imagettfbboxextended($size, 0, "fonts/MPlantin.ttf", "The quick brown fox jumps over the lazy dog.");

$smallWidth = $smallSize['width'];

$smallHeight = $smallSize['height'];

$canvas = imagecreatetruecolor($smallWidth + 20, $smallHeight * 2 + 20);

imagefill($canvas, 0, 0, imagecolorallocate($canvas, 255, 255, 255));

imagettftext($canvas, $size, 0, 10 + $smallSize['x'], 10 + $smallSize['y'], imagecolorallocate($canvas, 0, 0, 0), "fonts/MPlantin.ttf", "The quick brown fox jumps over the lazy dog.");



$largeSize = imagettfbboxextended($size * $factor, 0, "fonts/MPlantin.ttf", "The quick brown fox jumps over the lazy dog.");

$largeWidth = $largeSize['width'];

$largeHeight = $largeSize['height'];

$temp = imagecreatetruecolor($largeWidth, $largeHeight);

imagefill($temp, 0, 0, imagecolorallocate($canvas, 255, 255, 255));

imagettftext($temp, $size * $factor, 0, $largeSize['x'], $largeSize['y'], imagecolorallocate($temp, 0, 0, 0), "fonts/MPlantin.ttf", "The quick brown fox jumps over the lazy dog.");

imagecopyresampled($canvas, $temp, 10 + $smallSize['x'], 10 + $smallSize['y'] + 10, 0, 0, $smallWidth, $smallHeight, $largeWidth, $largeHeight);

imagepng($temp, "temp.png");



imagepng($canvas, "test.png");



function imagettfbboxextended($size, $angle, $fontfile, $text) {

    /*this function extends imagettfbbox and includes within the returned array

    the actual text width and height as well as the x and y coordinates the

    text should be drawn from to render correctly.  This currently only works

    for an angle of zero and corrects the issue of hanging letters e.g. jpqg*/

    $bbox = imagettfbbox($size, $angle, $fontfile, $text);



    //calculate x baseline

    if($bbox[0] >= -1) {

        $bbox['x'] = abs($bbox[0] + 1) * -1;

    } else {

        //$bbox['x'] = 0;

        $bbox['x'] = abs($bbox[0] + 2);

    }



    //calculate actual text width

    $bbox['width'] = abs($bbox[2] - $bbox[0]);

    if($bbox[0] < -1) {

        $bbox['width'] = abs($bbox[2]) + abs($bbox[0]) - 1;

    }



    //calculate y baseline

    $bbox['y'] = abs($bbox[5] + 1);



    //calculate actual text height

    $bbox['height'] = abs($bbox[7]) - abs($bbox[1]);

    if($bbox[3] > 0) {

        $bbox['height'] = abs($bbox[7] - $bbox[1]) - 1;

    }



    return $bbox;

}

mike at mikeleigh dot com 28-May-2007 04:05


I have been testing this function for a while now and have come up with many of the same issues that other people have touched upon.  Not being able to calculate the width of the text correctly.  Or if a solution is found then it won't work with a hanging letter or a negative start letter like 'j'.



Like Ralph I also wanted to draw a box around some text and this would require me being pixel perfect with the font.  The trouble is I did not know which font would be used or which size.  This led me to come up with a solution which I am sharing below.



<?php

function imagettfbboxextended($size, $angle, $fontfile, $text) {

    /*this function extends imagettfbbox and includes within the returned array

    the actual text width and height as well as the x and y coordinates the 

    text should be drawn from to render correctly.  This currently only works

    for an angle of zero and corrects the issue of hanging letters e.g. jpqg*/

    $bbox = imagettfbbox($size, $angle, $fontfile, $text);



    //calculate x baseline

    if($bbox[0] >= -1) {

        $bbox['x'] = abs($bbox[0] + 1) * -1;

    } else {

        //$bbox['x'] = 0;

        $bbox['x'] = abs($bbox[0] + 2);

    }



    //calculate actual text width

    $bbox['width'] = abs($bbox[2] - $bbox[0]);

    if($bbox[0] < -1) {

        $bbox['width'] = abs($bbox[2]) + abs($bbox[0]) - 1;

    }



    //calculate y baseline

    $bbox['y'] = abs($bbox[5] + 1);



    //calculate actual text height

    $bbox['height'] = abs($bbox[7]) - abs($bbox[1]);

    if($bbox[3] > 0) {

        $bbox['height'] = abs($bbox[7] - $bbox[1]) - 1;

    }



    return $bbox;

}

?>



The function above gives the correct x and y coordinates that the text should be drawn from and also gives the actual image width and height.  This has been tested with various fonts and sizes ranging from 6 up to 144 points.  Some of the output will appear to be incorrect and have an extra pixel on the right, using verdana at size 144 and outputting the character 'Q' for example.  This is not an error as this is part of the anti-aliasing of the font output.



Example Usage:

<?php

$font = 'c:\windows\fonts\verdana.ttf';

$font_size = 144;

$text = 'jüyZgQ';

$bbox = imagettfbboxextended($font_size, 0, $font, $text);

?>



Return Values:

Array

(

    [0] => -8

    [1] => 40

    [2] => 715

    [3] => 40

    [4] => 715

    [5] => -177

    [6] => -8

    [7] => -177

    [x] => 6

    [width] => 722

    [y] => 176

    [height] => 216

)



Further notes can be found here along with images of the output of the function http://mikeleigh.com/links/imagettfbbox

lassial dot gmail dot com 24-May-2007 01:46


Ralph Bolton commented about the difference in calculating the bounding box size vs. aligning text base line. 



The workaround for this issue is to calculate the difference in height between a character going below baseline and one above the baseline. This is likely going to vary from font to font, so I'd suggest something like this:



<?php



function fontBaselineOffset($font, $fontSize)

{

//this should be above baseline

$test2="H";

//some of these additional letters should go below it

$test3="Hjgqp";



//get the dimension for these two:



$box2 = imageTTFBbox($fontSize,0,$font,$test2);

$box3 = imageTTFBbox($fontSize,0,$font,$test3);



//return the offset value



return  abs((abs($box2[5]) + abs($box2[1])) - (abs($box3[5]) + abs($box3[1])));



}

?>



This is not perfect yet. You should define a range of allowed characters that can go below baseline, compare them to the ones actually found in your string and use them instead of the string $test3 used in the example function above. This should avoid problems with letters that go further below baseline than the others (e.g. there could be a difference between 'g' and 'p')

ralphbolton at mail2sexy dot com 23-Apr-2007 06:16


There's a bit of an annoyance with measuring font sizes and drawing boxes around text. When fonts are measured using ImageTTFbbox, the correct vertical height is returned. That is, the measurement of the phrase "Hanging" will be from the top of the "H" to the bottom of the "g".



The problem is that functions like imageTTFtext align with the "line" of the text - that is, in the phrase "Hanging", the alignment is below the "H", not the bottom of the "g". That means that if you draw a rectangle behind your text, it'll be incorrectly aligned because the hanging "g" will be outside the box.



For example, this doesn't work as you might expect (because the "g" hangs below the box):

<?php

// Get the size of the font box

$textbox = imageTTFBbox($size, 0, $font, 'Hanging');

$textwidth = abs($textbox[4] - $textbox[0]);

$textheight = abs($textbox[5] - $textbox[1]);



// Now draw a rectangle on the image

$colour = ImageColorAllocate($im, 100, 100, 100);

imagefilledrectangle($im, $x, $y - $textheight, $x + $textwidth, $y, $colour );



// Now draw the text

$black = ImageColorAllocate($im, 0, 0, 0);

ImageTTFText($image['resource'], $size, 0, $x, $y, $black, $font, 'Hanging');

?>

It also seems that the rectangle in the above example is located 1 pixel to the left of the text.



I haven't found a way to resolve this problem correctly. Instead, I have enlarged the rectangle and then put the text into it. I don't think this will work absolutely correctly for all fonts, so it's not exactly a perfect solution. However, it's better than nothing! Here is a snippet of it:

<?php

$enlargex = $textwidth * 0.08;

$enlargey = $textheight * 0.1;

$enlargey2 = $textheight * 0.5;



// Now draw a rectangle on the image

$colour = ImageColorAllocate($im, 100, 100, 100);

imagefilledrectangle($im, $x - $enlargex, $y - $textheight - $enlargey, $x + $textwidth + $enlargex, $y + $enlarge2, $colour );

?>

marclaz 31-Jul-2006 03:13


Please note that as imageTTFBbox and imageTTFText functions return an array of coordinates which could be negative numbers care must be taken with height and width calculations.



The rigth way to do that is to use the abs() function:



for an horizontal text:



$box = @imageTTFBbox($size,0,$font,$text);

$width = abs($box[4] - $box[0]);

$height = abs($box[5] - $box[1]);



Then to center your text at ($x,$y) position the code should be like that:



$x -= $width/2;

$y += $heigth/2;



imageTTFText($img,$size,0,$x,$y,$color,$font,$text);



this because (0,0) page origin is topleft page corner and (0,0) text origin is lower-left readable text corner.



Hope this help.

Nimja 08-May-2006 10:09


Warning: 

james.logsdon's function has a few flaws in copying my own function. Though he did a great job in making an overall nicer looking function it does have a few flaws.



His function does not allow for long words (longer then the width) linebreaks (harder then it looks) and has a non-pixel perfect location.



The problem with the imagettfbbox function is that different letters give a different x/y top-left coordinate. At least it looks that way for the eye. I 'solved' this by putting a space in front of every line and then offset the text by the width of that space.



So, although some things of my function seem useless they do serve an important purpose.

james.logsdon at firesidemedia dot net 05-May-2006 10:32


I've modified Nimja's function a little. It doesn't support line-breaks (didn't need it in my script), but it's easy enough to add in.



<?php



function imageWordWrapBBox ( $Text, $Width = 650, $FontSize = 10, $Font = './fonts/arial.ttf' )

{

    $Words = split ( ' ', $Text );

    $Lines = array ( );

    $Line  = '';



    foreach ( $Words as $Word )

    {

        $Box  = imagettfbbox ( $FontSize, 0, $Font, $Line . $Word );

        $Size = $Box[4] - $Box[0];

        if ( $Size > $Width )

        {

            $Lines[] = trim ( $Line );

            $Line    = '';

        }

        $Line .= $Word . ' ';

    }

    $Lines[] = trim ( $Line );



    $Dimensions = imagettfbbox ( $FontSize, 0, $Font, 'AJLMYabdfghjklpqry019`@$^&*(,' );

    $lineHeight = $Dimensions[1] - $Dimensions[5];



    return array ( $lineHeight, $Lines, $lineHeight * count ( $Lines ) );

}



function imageWordWrap ( $Text, $Width, $Color, $X = 0, $Y = 0, $FontSize = 10, $Font = './fonts/arial.ttf' )

{

    $Data = $this->imageWordWrapBBox ( $Text, $Width, $FontSize, $Font );



    foreach ( $Data[1] as $Key => $Line )

    {

        $locX = $X;

        $locY = $Y + ( $Key * $Data[0] );

        imagettftext ( $this->Image, $FontSize, 0, $locX, $locY, $Color, $Font, $Line );

    }



    return $Data;

}

?>

toe dot cutter at telia dot com 28-Feb-2006 04:41


Neither Greg's or Henrik N's code worked for me.



I figured out that imagettfbbox gives the size (coordinates) of the whole letter (ie. with the hang on 'g' or 'j'). So it was only a matter of finding the correct index of coordinates in the array.



Note: This doesn't work on Times New Roman Italic's 'f' for some reason.



<?php



    $size = imagettfbbox($fontsize, 0, $font, $text);

    $dx = abs($size[2]-$size[0]);

    $dy = abs($size[5]-$size[3]);



    ImageTTFText($im, $fontsize, 0, abs($size[6]), abs($size[5]), $txtcolor, $font, $text);



?>

Henrik N 26-Feb-2006 10:48


Tried Greg's code below, but it didn't quite work for me. This did, however:



<?php



$size = imagettfbbox($fontSize, 0, $font, $text);

$width = $size[2] + $size[0];

$height = abs($size[1]) + abs($size[7]);



$image = imagecreatetruecolor($width, $height); 



imagettftext($image, $fontSize, 0, 0, abs($size[5]), $black, $font, $text);



?>

greg at gregoryfenton dot be 11-Feb-2006 11:23


Have a problem with imagettfbbox cutting off the hang of letters such as 'g' or 'j'??



After days trying to figure this thing out, I finally cracked it:



  $size = imagettfbbox($s,0,$font,$text);

  $dx=abs($size[0])+abs($size[2]);

  $dy=abs($size[1])+abs($size[7]);



  ImageTTFText($im, $s, 0, $dx-abs($size[0]), $dy-abs($size[1]), $black, $font, $text);



The key is the abs commands - you must account for the negative numbers in the original imagettfbbox, and if you have any, take them away from the location at the end when the text is displayed:



you need to start the x and y at a (possibly) negative number, not 0,0 as I had thought.



Hope that helps someone..

Nimja 13-Jan-2006 05:32


My previous function had 2 bugs which are now fixed:

* Align is now pixel perfect, no longer dependant on the first character. Solved by putting a space " " in front of every rendered line, making the basepoint at the exact same place every time.

* X Y Coordinates are no longer the base-point, but the perfect top/left coordinates. This made my life designing a LOT easier.



Features:

* Newline support! (both Windows and Linux)

* Paragraph support, no newlines are ignored, not even empty ones. So empty lines are properly supported.

* True top/left x/y coordinates instead of TTF basepoint.(at least as close as possible).

* Align function for Left, Center and Right

* Support for words that are longer then the supported width.



<?php

//A function for pixel precise text Wrapping

function imageTextWrapped(&$img, $x, $y, $width, $font, $color, $text, $textSize, $align="l") {

    //Recalculate X and Y to have the proper top/left coordinates instead of TTF base-point

    $y += $textSize;

    $dimensions = imagettfbbox($textSize, 0, $font, " "); //use a custom string to get a fixed height.

    $x -= $dimensions[4]-$dimensions[0];



    $text = str_replace ("\r", '', $text); //Remove windows line-breaks

    $srcLines = split ("\n", $text); //Split text into "lines"

    $dstLines = Array(); // The destination lines array.

    foreach ($srcLines as $currentL) {

        $line = '';

        $words = split (" ", $currentL); //Split line into words.

        foreach ($words as $word) {

            $dimensions = imagettfbbox($textSize, 0, $font, $line.$word);

            $lineWidth = $dimensions[4] - $dimensions[0]; // get the length of this line, if the word is to be included

            if ($lineWidth > $width && !empty($line) ) { // check if it is too big if the word was added, if so, then move on.

                $dstLines[] = ' '.trim($line); //Add the line like it was without spaces.

                $line = '';

            }

            $line .= $word.' ';

        }

        $dstLines[] =  ' '.trim($line); //Add the line when the line ends.

    }

    //Calculate lineheight by common characters.

    $dimensions = imagettfbbox($textSize, 0, $font, "MXQJPmxqjp123"); //use a custom string to get a fixed height.

    $lineHeight = $dimensions[1] - $dimensions[5]; // get the heightof this line



    $align = strtolower(substr($align,0,1)); //Takes the first letter and converts to lower string. Support for Left, left and l etc.

    foreach ($dstLines as $nr => $line) {

        if ($align != "l") {

            $dimensions = imagettfbbox($textSize, 0, $font, $line);

            $lineWidth = $dimensions[4] - $dimensions[0]; // get the length of this line

            if ($align == "r") { //If the align is Right

                $locX = $x + $width - $lineWidth;

            } else { //If the align is Center

                $locX = $x + ($width/2) - ($lineWidth/2);

            }

        } else { //if the align is Left

            $locX = $x;

        }

        $locY = $y + ($nr * $lineHeight);

        //Print the line.

        imagettftext($img, $textSize, 0, $locX, $locY, $color, $font, $line);

    }        

}



?>

peisenmann at gmail dot com 29-Dec-2005 03:41


Another function for centered text string.

What it does: Generate a truecolor .png image of a text string. The image will be just large enough encompass the text and a 2 px border and the text will be centered in it.



It is called from any other page like so...

<img src="linkImg.php?text=php.net is great&border=out" /> // Text with #&+"'\<> will need to be escaped, but I've found spaces don't cause errors. I haven't tested this with any other languages.



The following code is the file named linkImg.php

The file was not designed to have anything else here with it, and the open and close php tags should the the very first and very last characters of the page respectively, as outside whitespace can be a little evil sometimes.

<?php 

//Obtain text and border via GET

//Border can be out, in, or flat

$text = $_GET['text'];

$border = $_GET['border'];

 

  $font = "fontpath"; //(str) "fonts/sasquatchlives.ttf"

  $fontsize = font size; //(int) pixels in GD 1, or points in GD 2



//Register box

$box = imagettfbbox ($fontsize, 0, $font, $text);

//Find out the width and height of the text box

$textW = $box[2] - $box[0];

$textH= $box[3]-$box[5];

//Add padding

$paddingx = 10;

$paddingy = 10;

//Set image dimentions

$width = $textW+$paddingx;

$height= $textH+$paddingy;



//Bottom left corner of text

$textx = $paddingx/2;

$texty = $height - $paddingy/2;



//Shadow offset (pixels)

$shadoffx = 1;

$shadoffy = 1;



//Create the image

 $img = imagecreatetruecolor($width,$height);

//Define some colors

 $white = imagecolorallocate($img,255,255,255);

 $black = imagecolorallocate($img,0,0,0);

 $lightgrey = imagecolorallocate($img,200,200,200);

 $grey = imagecolorallocate($img,100,100,100);

//Define Text (fg) and background (bg) colors

 $bgcol = imagecolorallocate($img,192,213,196); //Celadon (light pastel green)

 $fgcol = imagecolorallocate($img,243,104,88); //Peach

// Fill image with background color

 imagefill($img,0,0,$bgcol); 



//Write Shadow

imagettftext($img, $fontsize, 0, $textx+$shadoffx, $texty+$shadoffy, $grey, $font, $text);



//Write Text

imagettftext($img, $fontsize, 0, $textx, $texty, $fgcol, $font, $text);



//Bordering



   //Embossed border (button-looking)

 if ($border == "out") 

  {

   imageline ($img,0,0,$width,0,$white);imageline ($img,0,0,0,$height,$white);

   imageline ($img,1,1,$width,1,$lightgrey);imageline ($img,1,1,1,$height-1,$lightgrey);

   imageline ($img,0,$height-1,$width-1,$height-1,$black);imageline ($img,$width-1,$height-1,$width-1,0,$black);

   imageline ($img,2,$height-2,$width-2,$height-2,$grey);imageline ($img,$width-2,$height-2,$width-2,2,$grey);



  }

    //Flat border

 if ($border == "flat") 

  {

   imageline ($img,0,0,$width,0,$white);imageline ($img,0,0,0,$height,$white);

   imageline ($img,1,1,$width,1,$grey);imageline ($img,1,1,1,$height-1,$grey);

   imageline ($img,0,$height-1,$width-1,$height-1,$white);imageline ($img,$width-1,$height-1,$width-1,0,$white);

   imageline ($img,2,$height-2,$width-2,$height-2,$grey);imageline ($img,$width-2,$height-2,$width-2,2,$grey);

  }



    //Engraved border (pushed button)

 if ($border == "in") 

  {

   imageline ($img,0,0,$width,0,$black);imageline ($img,0,0,0,$height,$black);

   imageline ($img,1,1,$width,1,$grey);imageline ($img,1,1,1,$height-1,$grey);

   imageline ($img,0,$height-1,$width-1,$height-1,$white);imageline ($img,$width-1,$height-1,$width-1,0,$white);

   imageline ($img,2,$height-2,$width-2,$height-2,$lightgrey);imageline ($img,$width-2,$height-2,$width-2,2,$lightgrey);

  }



// Header info

 header("Content-type: image/png");

//Sends the image

 imagepng($img);

 imagedestroy($img);

?>



Hope this helps someone!

-Patrick-

Mickey9801 at ComicParty dot com 11-Dec-2005 06:31


I have revised my mb_wordwrap function to fix 2 major bugs: cannot handle line break and infinite loop while handling very very long long long single byte word.



<?php

function mb_wordwrap($txt,$font,$size,$width) {

    $pointer = 0; // Current character position pointer

    $this_line_start = 0; // Starting character position of current line

    $this_line_strlen = 1; // How long is the current line

    $single_byte_stack = ""; // Variable for storing single byte word

    $sbs_line_width = 0; // Pixel width of the Single byte word

    $this_is_cr = FALSE; // Check if the character is new line code (ASCII=10)

    $result_lines = array(); // Array for storing the return result

    

    while ($pointer < mb_strlen($txt)) {

        $this_char = mb_substr($txt,$pointer,1);

        if (ord($this_char[0])==10) $this_is_cr = TRUE; // Check if it is a new line

        // Check current line width

        $tmp_line = mb_substr($txt, $this_line_start, $this_line_strlen);

        $tmp_line_bbox = imagettfbbox($size,0,$font,$tmp_line);

        $this_line_width = $tmp_line_bbox[2]-$tmp_line_bbox[0];

        

        // Prevent to cut off english word at the end of line

        // if this character is a alphanumeric character or open bracket, put it into stack

        if (is_alphanumeric($this_char, $single_byte_stack)) $single_byte_stack .= $this_char;

        // Check the width of single byte words

        if ($single_byte_stack != "") {

            $tmp_line_bbox = imagettfbbox($size,0,$font,$single_byte_stack);

            $sbs_line_width = $tmp_line_bbox[2]-$tmp_line_bbox[0];

        }

        

        if ($this_is_cr || $this_line_width > $width || $sbs_line_width >= $width) {

            // If last word is alphanumeric, put it to next line rather then cut it off

            if ($single_byte_stack != "" && is_alphanumeric($this_char, $single_byte_stack) && $sbs_line_width < $width) {

                $stack_len = mb_strlen($single_byte_stack);

                $this_line_strlen = $this_line_strlen - $stack_len + 1;

                $pointer = $pointer - $stack_len + 1;

            }

            // Move the current line to result array and reset all counter

            $result_lines[] = mb_substr($txt, $this_line_start, $this_line_strlen-1);

            if ($this_is_cr) { $pointer++; $this_is_cr=FALSE; }

            if ($sbs_line_width >= $width) $sbs_line_width = 0;

            $this_line_start = $pointer;

            $this_line_strlen = 1;

            $single_byte_stack = "";

        } else {

            if (!is_alphanumeric($this_char, $single_byte_stack)) {

                $single_byte_stack = ""; // Clear stack if met multibyte character and not line end

            }

            $this_line_strlen++;

            $pointer++;

        }

    }

    // Move remained word to result

    $result_lines[] = mb_substr($txt, $this_line_start);

    

    return $result_lines;

}



function is_alphanumeric($character, $stack) {

    if (

                (ord($character)>=48 && ord($character)<=57) || 

                (ord($character)>=65 && ord($character)<=91) || 

                (ord($character)>=97 && ord($character)<=123) || 

                ord($character)==40 || 

                ord($character)==60 || 

                ($stack=="" && (ord($character)==34 || ord($character)==39))

            ) return TRUE;

            else return FALSE;

}

?>

Nashev 11-Dec-2005 02:38


see http://php.rinet.ru/manual/ru/function.imagettftext.php#57416 



function ByteCount($s) {

    $has_mbstring = extension_loaded('mbstring') ||@dl(PHP_SHLIB_PREFIX.'mbstring.'.PHP_SHLIB_SUFFIX);

    $has_mb_shadow = (int) ini_get('mbstring.func_overload');

    

    if ($has_mbstring && ($has_mb_shadow & 2) ) {

       $size = mb_strlen($s,'latin1');

    } else {

       $size = strlen($s);

    }

    return $size;

}



function foxy_utf8_to_nce($s) {

  $utf = "$s";

  

  $max_count = 5; // flag-bits in $max_mark ( 1111 1000 == 5 times 1)

  $max_mark = 248; // marker for a (theoretical ;-)) 5-byte-char and mask for a 4-byte-char;



  $html = '';

  $ByteCount = ByteCount($utf);

  for($str_pos = 0; $str_pos < $ByteCount; $str_pos++) {

    $old_chr = $utf{$str_pos};

    $old_val = ord($old_chr);

    $new_val = 0;



    $utf8_marker = 0;



    // skip non-utf-8-chars

    if ($old_val > 127) {

      $mark = $max_mark;

      for ($byte_ctr = $max_count; $byte_ctr > 2; $byte_ctr--) {

        // actual byte is utf-8-marker?

        if (($old_val & $mark) == (($mark << 1) & 255)) {

          $utf8_marker = $byte_ctr - 1;

          break;

        }

        $mark = ($mark << 1) & 255;

      }

    }

    

    // marker found: collect following bytes

    if ($utf8_marker > 1 and isset($utf{$str_pos + 1})) {

      $str_off = 0;

      $new_val = $old_val & (127 >> $utf8_marker);

      for($byte_ctr = $utf8_marker; $byte_ctr > 1; $byte_ctr--) {

        // check if following chars are UTF8 additional data blocks

        // UTF8 and ord() > 127

        if( (ord($utf{$str_pos + 1}) & 192) == 128 ) {

          $new_val = $new_val << 6;

          $str_off++;

          // no need for Addition, bitwise OR is sufficient

          // 63: more UTF8-bytes; 0011 1111

          $new_val = $new_val | ( ord( $utf{$str_pos + $str_off} ) & 63 );

        }

        // no UTF8, but ord() > 127

        // nevertheless convert first char to NCE

        else {

          $new_val = $old_val;

        }

      }

      // build NCE-Code

      $html .= '&#'.$new_val.';';

      // Skip additional UTF-8-Bytes

      $str_pos = $str_pos + $str_off;

    } else {

      $html .= chr($old_val);

      //$new_val = $old_val;

    }

  }

  return $html;

}

Mickey9801 at ComicParty dot com 22-Nov-2005 09:49


Most of functions shared here seems only work with western language and is not suitable for multibyte characters (like Chinese). I have written a function using mb_string functions to match the need of multibyte character word wrapping.



I also added some machanism so that English word won't be cut off at the end of line. Of couse you must use unicode string on GD.



function mb_wordwrap($txt,$font,$size,$width) {

    $pointer = 0;

    $this_line_start = 0;

    $this_line_strlen = 1;

    $single_byte_stack = "";

    $result_lines = array();

    while ($pointer <= mb_strlen($txt)) {

        $this_char = mb_substr($txt,$pointer,1);

        $tmp_line = mb_substr($txt, $this_line_start, $this_line_strlen);

        $tmp_line_bbox = imagettfbbox($size,0,$font,$tmp_line);

        $this_line_width = $tmp_line_bbox[2]-$tmp_line_bbox[0];

        if ($this_line_width > $width) {

            // If last word is alphanumeric, put it to next line rather then cut it off

            if ($single_byte_stack != "") {

                $stack_len = mb_strlen($single_byte_stack);

                $this_line_strlen -= $stack_len;

                $pointer -= $stack_len;

            }

            $result_lines[] = mb_substr($txt, $this_line_start, $this_line_strlen-1);

            $this_line_start = $pointer;

            $this_line_strlen = 1;

            $single_byte_stack = "";

        } else {

            // Prevent to cut off english word at the end of line

            // if this character is a alphanumeric character or open bracket, put it into stack

            if (

                (ord($this_char)>=48 && ord($this_char)<=57) || 

                (ord($this_char)>=65 && ord($this_char)<=91) || 

                (ord($this_char)>=97 && ord($this_char)<=123) || 

                ord($this_char)==40 || 

                ord($this_char)==60 || 

                ($single_byte_stack=="" && (ord($this_char)==34 || ord($this_char)==39))

            ) $single_byte_stack .= $this_char;

            else $single_byte_stack = ""; // Clear stack if met multibyte character and not line end

            $this_line_strlen++;

            $pointer++;

        }

    }

    // Move remained word to result

    $result_lines[] = mb_substr($txt, $this_line_start);

    

    return $result_lines;

}

Info at GravoMaster dot com 04-Nov-2005 05:01


TTF character charmap page

Could use some help in reading ttf file

so that unused rectangle chars are filtered out of the charmap

see

http://www.phpenabled.com/ttf_fontlist/

fontlist.php?font=Phones_NormalA.ttf

info at rainer-schuetze dot de 11-Jun-2005 06:32


according function by jtopland at hive dot no

08-Feb-2004 03:26



soukhinov at mail dot ru was right, the function doesn't work with 180?. By the way it was a intresting way to trasform the angle to radian. Change the calculation of the angle to the following:  $angle = $angle/ 180 * pi();

The function to calc. the points is correct. Sorry to say this, but the cal. of the height and width is incorrect. I used the version from LB (11-Feb-2004 08:55)



    /**

     * return width and height, offset [left, top] of a ttf character

     * @param string $font : the font file

     * @param string $text : the character

     * @param int $size : the font size

     * @param int $angle : the angle

     * @access private

     * @return array  of the width and height, left and top.

     **/

    function _getCharacterSize($font, $text, $size, $angle)

    {

         // Get the boundingbox from imagettfbbox(), which is correct when angle is 0

         $bbox = imagettfbbox($size, 0, $font, $text);



         // Rotate the boundingbox

         $angle = $angle/ 180 * pi();

         for ($i=0; $i<4; $i++)

         {

                 $x = $bbox[$i * 2];

                 $y = $bbox[$i * 2 + 1];

                 $bbox[$i * 2] = cos($angle) * $x - sin($angle) * $y;  // X

                 $bbox[$i * 2 + 1] = sin($angle) * $x + cos($angle) * $y; // Y

         }

         // Variables which tells the correct width and height

        $bbox["left"] = 0- min($bbox[0],$bbox[2],$bbox[4],$bbox[6]);

        $bbox["top"] = 0- min($bbox[1],$bbox[3],$bbox[5],$bbox[7]);

        $bbox["width"] = max($bbox[0],$bbox[2],$bbox[4],$bbox[6]) -  min($bbox[0],$bbox[2],$bbox[4],$bbox[6]);

        $bbox["height"] = max($bbox[1],$bbox[3],$bbox[5],$bbox[7]) - min($bbox[1],$bbox[3],$bbox[5],$bbox[7]);

        

        return $bbox;

    }

php@da dot mcbf dot net 01-May-2005 04:37


Pretty trivial, but still might save someone some trouble: on my system (Debian Linux), the absolute path to the font file had to be specified. I tried it relative to the current webpage and that did not work.

ryan at retronetworks dot com 29-Mar-2005 04:46


Here is a function that lets you write a string with your own "font tracking" level (the amount of pixels separating each character).  It uses imagettfbbox to determine the width of each character, so it doesn't discriminate against the skinnier of characters.  For this example, let $t = the amount of distance in pixels you want to separate each character from its neighbors.



<?php

function ImageTTFTextWithTracking($im, $size, $angle, $t, $x, $y, $color, $font, $text) {

    $numchar = strlen($text);

    for($i = 0; $i < $numchar; $i++) {

        # Assign character

        $char[$i] = substr($text, $i, 1);



        # Write character

        imagettftext($im, $size, $angle, ($x + $w + ($i * $t)), $y, $color, $font, $char[$i]);

        

        # Get width of character

        $width = imagettfbbox($size, $angle, $font, $char[$i]);

        $w = $w + $width[2];

    }

}

?>



Be aware that it currently does not work for angles other than the 0 default (I have no need for that).

soukhinov at mail dot ru 16-Mar-2005 01:00


I have tryed all of fixes

The David Eder's fix is the only working fix.

The "jtopland at hive dot no"s fix is good enough, but it not working with angle = 180 degrees.

helloktk at naver dot com 24-Jun-2004 03:55


Here is a function which moves the center of text's bounding 

box to a given pivot point (px,py) and rotates text about

that point.

<?php

$width=500;

$height=400;

$fontpath = 'c:/windows/fonts/arial.ttf';

$text = 'Finally, I have a roated text box';

$fontsize = 20;

$angle = 30.0;

// create an image and fill the background with lightgray

$image = imagecreatetruecolor($width,$height);

imagefill($image, 0, 0, 0xDDDDDD);

// bounding box

$bbox = imagettfbbox($fontsize, 0, $fontpath, $text);

// baseline point for drawing non-rotated text.

$x0=  $bbox[6];

$y0=-$bbox[7];

// fixes bounding box w.r.t. image coordinate.

$bbox[5]=-$bbox[5]+$bbox[1];

$bbox[7]=-$bbox[7]+$bbox[3];

$bbox[1]=0;

$bbox[3]=0;

// get the size of image.

$sx=imagesx($image);

$sy=imagesy($image);

// center of bounding box (xc,yc);

$xc=($bbox[0]+$bbox[2])/2.0;

$yc=($bbox[1]+$bbox[7])/2.0;

// rotation angle in radian

$rad=$angle*pi()/180.0;

$sa=sin($rad);

$ca=cos($rad);

$x1=$x0-$xc;

$y1=$y0-$yc;

//pivot point(here, we take the center of image)

$px=$sx/2.0;

$py=$sy/2.0;

// new baseline point for rotated text.

$x2= intval( $x1*$ca+$y1*$sa+$px+0.5);

$y2= intval(-$x1*$sa+$y1*$ca+$py+0.5);



imagettftext($image,$fontsize,$angle,$x2,$y2,0xFF,$fontpath,$text);

// draw rotated bounding box;

rotbbox($bbox,$angle,$px,$py);   

for($i=0;$i<4;$i++){

   $x0=$bbox[2*$i+0];

   $y0=$bbox[2*$i+1];

   $j=$i+1; 

   if($j==4) $j=0;

   $x1=$bbox[2*$j+0];

   $y1=$bbox[2*$j+1];

   imageline($image,$x0,$y0,$x1,$y1,0xFF0000);

}

// Show the image

imagepng($image);



function rotbbox(&$bbox,$angle,$px,$py){

     $xc=($bbox[0]+$bbox[2])/2.0;

     $yc=($bbox[1]+$bbox[7])/2.0;

     $rad=$angle*pi()/180.0;

     $sa=sin($rad);

     $ca=cos($rad);

     for ($i=0;$i<4;$i++){

         $x=$bbox[$i*2+0]-$xc;

         $y=$bbox[$i*2+1]-$yc;

         $bbox[$i*2+0]= intval( $ca*$x+$sa*$y+$px+0.5);

         $bbox[$i*2+1]= intval(-$sa*$x+$ca*$y+$py+0.5);

     }

}

?>

jrisken at mn dot rr dot com 09-Mar-2004 11:12


I took Magicaltux's word wrap procedure and modified it in two ways.  I changed the order of processing so that the string plotting function is called only once for each word instead of for every character.  And I wrote the results to a string scalar instead of a string array, with embedded breaks <br> at line ends.  It should run pretty fast.  Mine breaks only on spaces, but hyphens could easily be added.



I'm new to PHP so I apologize for my idiosyncratic formatting conventions.

<?

function myWordWrap($txt,$font,$size,$width) 

{

    /*

        word-wrapper.  gets bounding box sizes for each word in a string, then

        strings words together up to desired width. calls strpos and

        imagettfbbox only once per word - so very fast.

        this version reconcatenates the words with a <br> character where

        the line break should be.

    */

    $txt.=" "; // guaranteed to find end of line

    $spaces=array();

    $wids=array();

    $i=0;

    while(true)

    {

        $j=strpos(substr($txt,$i)," ");

        if(!($j===false))

        {

            $spaces[]=$j+$i;

            $bbox=imagettfbbox($size,0,$font,substr($txt,$i,$j+1));

            $left=($bbox[0]>$bbox[6])?$bbox[6]:$bbox[0]; 

            $right=($bbox[2]>$bbox[4])?$bbox[2]:$bbox[4]; 

            $wids[]=$right-$left; 

            $i=$j+$i+1;

        }

        else     break;

    }

    $lastspace=-1;

    $cum=0;

    $t2="";

    for($i=0;$i<count($spaces);$i++)

    {

        if((($cum>0)&&($cum+$wids[$i])>$width)) // time for a line break

        {

            $t2.="<br>";

            $cum=0;

            $i--;

        }

        else 

        {

            // we'll always get at least one word (even if too wide) thanks to 

            // ($cum>0) test above

            $t2.=substr($txt,$lastspace+1,$spaces[$i]-$lastspace);

            $cum+=$wids[$i];

            $lastspace=$spaces[$i];

        }

    }

    return $t2;

}

?>

jtopland at hive dot no 08-Feb-2004 11:26


Finally managed to make a fixed version of imagettfbbox().

All angles returns correct values.

Except that imagettftext() returns different trackings (space between each character) when rotating.



<?php

    // Set some test variables

    $font = "d://www//tahoma.ttf";

    $text = "Finally, I can center rotated text!";

    $size = 20;

    $angle = 20;



    // Create an image and fill the background with lightgray

    $image = imagecreatetruecolor(500, 400);

    imagefill($image, 0, 0, hexdec("dddddd"));



    // Make a cross to make it easier to analyze

    imageline($image, 0, 0, imagesx($image), imagesy($image), hexdec("000000"));

    imageline($image, imagesx($image), 0, 0, imagesy($image), hexdec("000000"));



    // Run a fixed version of imagettfbbox()

    $bbox = imagettfbbox_fixed($size, $angle, $font, $text);



    // Make some text and center the text on the image.

    // imagettftext() pivot is on lower left

    imagettftext($image, $size, $angle, imagesx($image) / 2 - $bbox['width'] / 2, imagesy($image) / 2 + $bbox['height'] / 2, hexdec("0000ff"), $font, $text);



    // Show the image

    imagepng($image);



    function imagettfbbox_fixed($size, $angle, $font, $text)

    {

        // Get the boundingbox from imagettfbbox(), which is correct when angle is 0

        $bbox = imagettfbbox($size, 0, $font, $text);



        // Rotate the boundingbox

        $angle = pi() * 2 - $angle * pi() * 2 / 360;

        for ($i=0; $i<4; $i++)

        {

            $x = $bbox[$i * 2];

            $y = $bbox[$i * 2 + 1];

            $bbox[$i * 2] = cos($angle) * $x - sin($angle) * $y;

            $bbox[$i * 2 + 1] = sin($angle) * $x + cos($angle) * $y;

        }



        // Variables which tells the correct width and height

        $bbox['width'] = $bbox[0] + $bbox[4];

        $bbox['height'] = $bbox[1] - $bbox[5];



        return $bbox;

    }

?>