imagefttext

(PHP 4 >= 4.0.7, PHP 5, PHP 7, PHP 8)

imagefttext — Escreve texto em uma imagem usando fontes FreeType 2

Descrição

imagefttext(
    GdImage $image,
    float $size,
    float $angle,
    int $x,
    int $y,
    int $color,
    string $font_filename,
    string $text,
    array $options = []
): array|false

Nota:
Antes do PHP 8.0.0, imagefttext() era uma variante estendida de imagettftext() que suportava adicionalmente o parâmetro options. A partir do PHP 8.0.0, imagettftext() é um apelido de imagefttext().

Parâmetros

image

Um objeto GdImage, retornado por uma das funções de criação de imagem, como imagecreatetruecolor().

size

O tamanho da fonte a ser usado, em pontos.

angle

O ângulo em graus, com 0 grau sendo a leitura da esquerda para a direita. Valores maiores representam a rotação no sentido anti-horário. Por exemplo, um valor de 90 resultaria em uma leitura de baixo para cima.

x

As coordenadas dadas por x e y definirão o ponto base do primeiro caractere (aproximadamente o canto inferior esquerdo do caractere. Isto é diferente de imagestring(), onde x e y definem o canto superior esquerdo do primeiro caractere. Por exemplo, "superior esquerdo" é 0, 0.

y

A ordenada y. Isto define a posição da linha de base da fonte, e não a parte mais baixa do caractere.

color

O índice da cor desejada para o texto, veja imagecolorexact().

font_filename

O caminho para a fonte TrueType a ser usada.

Dependendo de qual versão da biblioteca GD que o PHP estiver usando, quando font_filename não iniciar com uma barra /. a extensão .ttf será anexada ao nome do arquivo e a biblioteca tentará pesquisar por este arquivo ao longo do caminho definido pela biblioteca.

Em muitos casos onde uma fonte reside no mesmo diretório que o script que está sendo executado, o truque a seguir aliviará problemas ao incluir arquivos.

<?php
//Define a variável de ambiente para GD
putenv('GDFONTPATH=' . realpath('.'));

// Nomeia a fonte a ser usada (note a falta da extensão .ttf)
$font = 'SomeFont';
?>

text

Texto a ser inserido na imagem.

options

**Índices de array possíveis para `options`**
Chave	Tipo	Significado
`linespacing`	float	Define espaçamento entre linhas

Valor Retornado

Esta função retorna um array com os quatro pontos que definem os limites do texto, iniciando no canto inferior esquerdo e seguindo no sentido anti-horário:

0	canto inferior esquerdo, posição X
1	canto inferior esquerdo, posição Y
2	canto inferior direito, posição X
3	canto inferior direito, posição Y
4	canto superior direito, posição X
5	canto superior direito, posição Y
6	canto superior esquerdo, posição X
7	canto superior esquerdo, posição Y

Em caso de falha, false é retornado.

Registro de Alterações

Versão	Descrição
8.0.0	O parâmetro `image` agora espera uma instância de GdImage; anteriormente, um resource `gd` válido era esperado.

Exemplos

Exemplo #1 Exemplo de imagefttext()

<?php
// Cria uma imagem 300x100
$im = imagecreatetruecolor(300, 100);
$red = imagecolorallocate($im, 0xFF, 0x00, 0x00);
$black = imagecolorallocate($im, 0x00, 0x00, 0x00);

// Deixa o fundo vermelho
imagefilledrectangle($im, 0, 0, 299, 99, $red);

// Caminho para o arquivo de fonte ttf
$font_file = './arial.ttf';

// Desenha o texto 'PHP Manual' usando fonte tamanho 13
imagefttext($im, 13, 0, 105, 55, $black, $font_file, 'PHP Manual');

// Mostr a imagem no navegador
header('Content-Type: image/png');

imagepng($im);
imagedestroy($im);
?>

Notas

Nota: Esta função só estará disponível se o PHP for compilado com suporte ao freetype (--with-freetype-dir=DIR).

Veja Também

imageftbbox() - Fornece a caixa limite de um texto usando fontes via freetype2
imagettftext() - Write text to the image using TrueType fonts

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User Contributed Notes 15 notes

down

ben at tNOSPAManjNOSPAMo dot cnospamordots dot om ¶

22 years ago


If you're interested in turning off FreeType hinting, search for the following line in the gd source (gdft.c):
      err = FT_Load_Glyph (face, glyph_index, FT_LOAD_DEFAULT);
and replace it with
      err = FT_Load_Glyph (face, glyph_index, FT_LOAD_NO_HINTING);

Recompile GD, and vo?la: beauteous antialiasing.

down

MagicalTux at FF dot st ¶

19 years ago


When compiling PHP with FreeType 2 support, you'll probably have some problems if - for example - you use debian and didn't compile freetype2 yourself...
If configure fails after saying "If configure fails, try --with-xpm-dir..." you most likely have FreeType1 installed, but not freetype2 ...

Do this as root :
apt-get install libfreetype6-dev

It took me some time to find out that apt-get install freetype2 is actually installing freetype1 ...

down

aidan at php dot net ¶

19 years ago


This function is very simular to imageffttext(), you may find the information provided on its manual page helpful:

http://php.net/imagettftext

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sebastiand at gmx dot de ¶

21 years ago


After spending the evening with some work on automatically generated images, I had the idea to switch of anti-aliasing (looking, if some font would look better that way), which turned out not to be quite so easy.

Actually you have to use the negative of the desired color to switch of antialising. I include the corresponding line from my code (line split up):

// USE NEGATIVE OF DESIRED COLOR TO SWITCH OF ANTI-ALIASING
ImageFTText ($neuesBild,$fontsize,$fontangle,$TextPosX,$TextPosY,
-$custom_fg,$fonttype,$text,array());

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KeepSake at crimebloc dot com ¶

15 years ago


For a design project I am required to have spacing between characters; since imagefttext does not support this feature I have created a function which does support this. 

The arguments are identical to imagefttext, accept that (array)$extrainfo now accepts the 'character_spacing' spacing parameter. The return values are as expected, and include the image boundaries of the entire string including the character spacing.

The downside is that $angle rotates each letter instead of rotating the entire word (could be seen as a feature on its own).

I hope this is of some use to someone.
- KeepSake

<?php
// Required header (assuming we use png images)
header("Content-type: image/png");

// Create a basic image with a dark background.
$image = imagecreatetruecolor(300, 20);
imagefill($image, 0, 0, imagecolorallocate($image, 21, 21, 21));

// Function call, arguments are the same as imagefttext, expect that (array)$extrainfo takes a new paramenter called character_spacing.
$imageBox = imagefttext2($image, 9, 0, 2, 15, imagecolorallocate($image, 255, 255, 255), 'tahomabold.ttf', 'The quick brown fox...', array('character_spacing' => 5));

// Output the file, and clear the resources
imagepng($image);
imagedestroy($image);

function imagefttext2($imageResource, $font_size, $text_angle, $start_x, $start_y, $color, $font_file, $text, $extra_info = array()) {
    if($extra_info['character_spacing'] == NULL || !is_numeric($extra_info['character_spacing'])) {
        $extra_info['character_spacing'] = 0;
    }
    $lastX = $start_x - $extra_info['character_spacing'];
    foreach(str_split($text) as $v) {
        $coordinates = imagefttext($imageResource, $font_size, $text_angle, $lastX + $extra_info['character_spacing'], $start_y, $color, $font_file, $v, $extra_info);
        $lastX = max($coordinates[2], $coordinates[4]);
    }
    // Return the newly generated image box coordinates:
    return array($start_x, $start_y, $coordinates[2], $coordinates[3], $coordinates[4], $coordinates[5], $start_x, $coordinates[7]);
}

?>

down

d underscore brown x at hotmail dot ¶

17 years ago


realpath(".")
realpath(getenv("SCRIPT_FILENAME"));

could be different.  This helped when setting GDFONTPATH.

down

darren at badpun dot co dot uk ¶

17 years ago


I had trouble working out how to accurately represent fonts in point sizes when constructing charts that had a user-customisable output DPI (basically, the user could specify the size of the chart in mm - or any other physical measure - and the DPI to create arbitrarily-sized charts to work properly in real printed documents).

GD1 was OK as it used pixels for font rendering, but GD2 uses points, which only makes any sense if you know the DPI that it assumes when rendering text on the image surface. I have not been able to find this anywhere in this documentation but have examined the GD2 source code and it appears to assume a DPI of 96 internally. However, this can easily be customised in the GD2 source so it cannot be assumed that all PHP interpreters out there have a GD2 compiled using 96dpi internally.

If it does, and you are using it to construct images whose target DPI is not 96, you can calculate the point size to supply to imageftbox() and imagefttext() like this:

<?php
/* 100mm x 100mm image */
$imageWidth = 100;
$imageHeight = 100;

/* 300 dpi image, therefore image is 1181 x 1181 pixels */
$imageDPI = 300;

/* unless we do this, text will be about 3 times too small */
$realFontSize = ($fontPt * $targetDPI) / 96;
?>

down

Anonymous ¶

18 years ago


I am using php 5.1.2 on a winxp machine. I was  getting into the TrueType fonts and wanted to see which ones would look best incorporated into web images. So I created the following script that prints out samples of all the TrueType fonts found in my C:\Windows\Fonts directory. The script takes only one request parameter - 'fsize'. It stands for font-size and lets you see each font in any size you wish -- I limited it to values between 5 and 48. Hope this helps someone other than me :)

I apologize in advance if any of my code is not the prettiest-written php code even seen -- I have only been coding in php for the past week (I'm a perl-guy usually).

<?php
    list($x, $y, $maxwidth) = array(0, 0, 0);

    $fsize = (int)$_REQUEST['fsize'];
    if ($fsize < 5 or $fsize > 48) $fsize = 8;

    header("Content-type: image/jpeg");

    // don't know how wide or tall the font samples will be.
    // create a huge image for now, we'll copy it smaller
    // later when we know how large the image needs to be.
    $im = imagecreate(1000, 20000) or die('could not create!');
    $clr_white = imagecolorallocate($im, 255, 255, 255);
    $clr_black = imagecolorallocate($im, 0, 0, 0);

    $font_path = "C:/Windows/Fonts/";
    $dh = opendir($font_path);
    while (($file = readdir($dh)) !== FALSE) {
        // we're only dealing with TTY fonts here.
        if (substr(strtolower($file), -4) != '.ttf') continue;

        $str = "Sample text for '$file'";
        $bbox = imagettfbbox(
            $fsize, 0, "{$font_path}{$file}", $str
        );
        $ww = $bbox[4] - $bbox[6];
        $hh = $bbox[1] - $bbox[7];

        imagettftext(
            $im, $fsize, 0, $x, $y,
            $clr_black, "{$font_path}{$file}", $str
        );

        $y += $hh + 20;
        if ($ww > $maxwidth) $maxwidth = $ww;
    }

    closedir($dh);

    // ok, now we can chop off the extra space from the
    // 1000 x 20000 image.
    $im2 = imagecreate($maxwidth + 20, $y);
    imagecopyresized(
        $im2, $im, 0, 0, 0, 0, $maxwidth + 20,
        $y, $maxwidth + 20, $y
    );
    imagejpeg($im2);
    imagedestroy($im);
    imagedestroy($im2);
?>

down

vsazel at atlas dot cz ¶

19 years ago


If you want to get the best result in monochrome font rendering, change render_mode to FT_LOAD_RENDER. It's the last parameter of FT_Load_Glyph() function (in gdft.c).

down

dnf at seznam dot cz ¶

19 years ago


For negative image you must add one line after the $grayColor computation:

$grayColor =  ~ $grayColor & 0x7FFFFFF;

down

kagaku at gmail dot com ¶

20 years ago


I found myself in need of an align right function and found one on the imagepstext manual page. I can't imagine I'm the only person who's needed to use this, so here's a slightly modified version that works with imagefttext:

<?
  function align_right($string, $fontfile, $imgwidth, $fontsize){
    $spacing = 0;
    $line = array("linespacing" => $spacing);
    list($lx,$ly,$rx,$ry) = imageftbbox($fontsize,0,$fontfile,$string,$line);
    $textwidth = $rx - $lx;
    $imw = ($imgwidth-10-$textwidth);
    return $imw;
  }
?>

down

eshenk at comcast dot net ¶

20 years ago


I wrote a bit of code to gather all the .ttf files in the directory with this script, and randomize them to write text on a header image for my site. The only catch is the font files have to be named 1.ttf, 2.ttf etc etc.

<?php

srand((double)microtime()*1234567); // Start the random gizmo
$image = imagecreatefromjpeg(rand(1,exec('ls *.jpg | wc -l')) . ".jpg"); // Get a background
$font = rand(1,exec('ls *.ttf | wc -l')) . ".ttf"; // Get a font
$textcolor = imagecolorallocate($image,0,0,0); // Set text color

$text1 = "shenko.homedns.org"; // Here is our text

imagettftext($image, 50, 0, 20, 50, $textcolor, $font, $text1); // Write the text with a font

header("Content-type: image/jpeg"); // Its a JPEG
imagejpeg($image,'',90); // Zap it to the browser
imagedestroy($image); // Memory Freeupage

?>

down

-1

cory at lavacube dot com ¶

18 years ago


Since this function is not documented, I felt it was best that I shed some light on the extrainfo parameter.

You can see the full documentation at the GD reference manual:
http://www.boutell.com/gd/manual2.0.33.html#gdImageStringFTEx

Basically it accepts an array containing the following options as keys and an associated value:
(int) flags [more info in the GD reference manual]
(double/float) linespacing
(int) charmap
(int) hdpi
(int) vdpi
(string) xshow
(string) fontpath

My C/C++ is not very good but this is the best I can explain. Read the documentation for more information. :-)

A very simple example of usage would be:

<?php

imagefttext( $img_pointer, 12, 0, 10, 10, [-insertsomecolour-], '/path/to/font.ttf', "THIS IS A TEST\nTHIS IS LINE 2\nTHIS IS LINE3", array('lineheight'=>2.0) );

?>

down

-1

jwilliam at kcr dot uky dot edu ¶

22 years ago


Thanks for the script!  I modified it to show several fonts that I was wanting to use.  I am using GD-2.0.7, FreeType-2.1.3(text rotation fix,among others), and PHP-4.2.3 and had to include the array information to get it to work.

Code change follows:
$fontfile="/usr/local/fonts/ttf/bookantbd.ttf";
// Waterfall of point sizes to see what Freetype 2's autohinting looks like:
//
for($i=4;$i<=12;$i++){
  ImageFtText($image,$i,0,10,(280+$i*14),$forecolor,$fontfile, bookantbd . $i . ". " . $string, array("linespacing" => 1.0));
}

John

down

-1

php@davehirschD0TK0MM ¶

14 years ago


I'm not sure if this is a PHP issue or an GD issue, but after upgrading to PHP 5.3.2, text written at an angle has become top-justified (so "N" and "n" have the same top, but the bottom of the "N" is lower than the bottom of the "n".  I've written a kludgy work-around, which writes the text to a non-rotated temporary image, then copies the temporary image, rotated onto the main image.  The kludginess is to get around the fact that I can't seem to extract the font info, particularly the distance between the baseline and the very bottom (I've hard-coded it as 30% of the font size)
I hope the bug can be fixed (if it is indeed a bug) or that others can improve this code:

<?php
    // Function that draws rotated text by creating a temporary image and rotating it, since rotated text appears to be busted
    function imageTextRotated($image, $size, $angle, $x, $y, $inColor, $fontfile, $text, $info=array()) {
//        Force some demo text that contains risers and descenders:
//        $text = "Nlfbacejygq!";

        $bbox = imageftbbox($size, 0, $fontfile, $text, $info);
        $dropdown = $size*0.3;
        $xsize = abs($bbox[2] - $bbox[0]);
        $ysize = abs($bbox[5] - $bbox[3]);
        $tmpImage = imagecreatetruecolor($xsize*1.25, $ysize*1.25);        // need the extra space to accommodate risers and descenders
        $transparent = imagecolorallocate($tmpImage, 255, 255, 154);
        if (!$transparent) {
            error_log("Color allocate failed");
        }
        imagecolortransparent($tmpImage, $transparent);
        if (!imagefill($tmpImage, 0, $ysize, $transparent)) {
            error_log("Fill failed");
        }
        $rgb = imagecolorsforindex($image, $inColor);
        $color = imagecolorexact($tmpImage, $rgb['red'], $rgb['green'], $rgb['blue']);
        if ($color == -1) {
            $color = imagecolorallocate($tmpImage, $rgb['red'], $rgb['green'], $rgb['blue']); 
            if (!$color) {
                error_log("Color allocate 2 failed");
            }
        }

        $newbbox = imagefttext($tmpImage, $size, 0, 0, $ysize*1.0, $color, $fontfile, $text, $info);
        $tmpImage = imagerotate($tmpImage, $angle, $transparent);
        $newWidth = imagesx($tmpImage);
        $newHt = imagesy($tmpImage);
        imagecopymerge($image, $tmpImage, $x-$newWidth+$dropdown, $y-$newHt, 0, 0, $newWidth, $newHt, 100);
        
//        Highlight the desired starting point (baseline) with a green dot:
//        $green = imagecolorallocate($image, 0, 251, 0);
//        imagefilledellipse($image, $x, $y, 10, 10, $green);
        imagedestroy($tmpImage);
?>

-Dave

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