PHP: imageftbbox

User Contributed Notes
imageftbbox

groomed at users dot sf dot net
27-May-2004 02:38


ImageFTBBox returns a bounding box, not metrics, as some (most?) of the notes above seem to assume. The 8 values it returns specify the 4 corners of this bounding box. So to properly determine the width and height of a string you need to do:



$bbox = ImageFTBBox(...);

$width = abs($bbox[0]) + abs($bbox[2]); // distance from left to right

$height = abs($bbox[1]) + abs($bbox[5]); // distance from top to bottom

sectionthirty1 at yahoo dot com
22-Apr-2004 04:50


Here is a handy example I used to center "dynamic text" onto an image.  



Ex. Say you want to center a clients IP Address onto a picture.  



$ip=$_SERVER['REMOTE_ADDR'];    



$details = imageftbbox($fontsize, 0, $font, $ip, array("linespacing" => 1));



$xcoord = ($imgwidth - $details[4]) / 2;  // this will return the x coordinate centered to your specific image.  Make sure  you set $imgwidth to the width of the image you are using.      



imagettftext($image, $fontsize, 0, $xcoord, $ycoord, $fontcolor, $font, $ip);

Brian at PrintsMadeEasy dot com
06-Mar-2003 09:54


I noticed that PHP's True Type functions do not allow you to create text blocks with multiple lines that automatically adjust for alignment.  I wrote a function that will allow you to generate images with multiple lines, control the alignment, and handle rotation.  I hope it helps someone.



There was too much code to paste on this message post so you can grab it off of my webserver.  I also created an example page so that you can see the code in action.



Example Page:

http://www.PrintsMadeEasy.com/code_samples/php/text_generation.php



Download the Text file:

http://www.PrintsMadeEasy.com /code_samples/php/text_generation.txt

ta at NOSPAM dot magicsquare dot info
06-Sep-2002 11:37


i've found a work around for this situation



it seems that height is directly proportional to line spacing so you just have to apply the same factor to image height



for example :



$spacing = 0.7;

$params = array("linespacing" => $spacing);



$box = imageftbbox ($size, 0, $font, $text, $params);

$tw=$box[4]-$box[0]; //image width

$th=($box[1]-$box[5])*$spacing; //image height

phpimageftbbox at juggernaut dot com dot au
14-May-2002 11:56


This function can be used to generate right-aligned text. Just work out how wide the text image is and position it accordingly. Example:



$i_width  = 200;

$i_height = 40;



$string = "Hello World!";

$pointsize = 10;

$fontfile = "/usr/local/lib/ttf/Helve.ttf";



$im = imagecreate($i_width, $i_height);

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

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



$string_size = ImageFtBbox($pointsize, 0, $fontfile, $string, array("linespacing" => 1));

$s_width  = $string_size[4];

$s_height = $string_size[5];



ImageFtText($im, $pointsize, 0, $i_width - $s_width - 1,  0 - $s_height, $white, $fontfile, $string, array("linespacing" => 1));



Header ("Content-type: image/png");

ImagePNG ($im);

ImageDestroy ($im);

imageftbbox

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