imagechar

(PHP 4, PHP 5)

imagechar — Desenha um caractere horizontalmente

Descrição

int imagechar ( resource $image , int $font , int $x , int $y , string $c , int $color )

imagechar() desenha o primeiro caractere de c na imagem identificada por image com o canto superior esquerdo em x ,y (em cima a esquerda é 0, 0) com a cor color . Se font for 1, 2, 3, 4 or 5, uma fonte interna é usada (onde os números mais altos correspondem a fonter maiores).

Exemplo #1 Exemplo imagechar()


<?php

$im = imagecreate(100, 100);

$string = 'PHP';

$bg = imagecolorallocate($im, 255, 255, 255);
$black = imagecolorallocate($im, 0, 0, 0);

// mostra um "P" preto no canto superior esquerdo
imagechar($im, 1, 0, 0, $string, $black);

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

?>

Veja também imagecharup() e imageloadfont().

add a note User Contributed Notes
imagechar

liam dot wiltshire at lineone dot net
29-Mar-2009 11:11


A quick function to automatically generate a multi line image from a string, with the image size automatically calculated from the string itself.





<?php





function multilineimage($string){





    // Probably not the best way of handling newlines, but bar OS9, doesn't really cause a problem


    $string = str_replace("\r","",$string);


    $string = explode("\n",$string);





    $maxlen = 0;


    foreach ($string as $str){


        if (strlen($str) > $maxlen){


            $maxlen = strlen($str);


        }


    }





    // Set font size


    $font_size = 4;





    // Create image width dependant on width of the string


    $width  = imagefontwidth($font_size)*$maxlen;


    // Set height to that of the font


    $height = imagefontheight($font_size) * count($string);


    // Create the image pallette


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


    // Grey background


    $bg    = imagecolorallocate($img, 205, 255, 255);


    // White font color


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





    $ypos = 0;





    foreach ($string as $str){





        $len = strlen($str);


        for($i=0;$i<$len;$i++){


            // Position of the character horizontally


            $xpos = $i * imagefontwidth($font_size);


            // Draw character


            imagechar($img, $font_size, $xpos, $ypos, $str, $color);


            // Remove character from string


            $str = substr($str, 1);   


        }


        $ypos = $ypos + imagefontheight($font_size);   


    }





    // Return the image 


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


    imagegif($img);


    // Remove image


    imagedestroy($img);


}





multilineimage("This is an image


This is line 2\nLine 3


Line 4");





?>

sw at profilschmiede dot de
20-Jun-2005 03:35


For the sake of completeness, here is an example for imagechar. 

The base-image automatically adjusts to the size and the height of the given string. Using the rand()-function the y-position of each char is slightly varied with every loop-run. You can easily rewrite the script to use a randomly generated string - the one given here just serves as an example.



<?php



$string = '1 2 3 4 5 6 7 8 9 A B C D E F G';

$font_size = 5;

$width=imagefontwidth($font_size)*strlen($string);

$height=imagefontheight($font_size)*2;

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

$bg = imagecolorallocate($img,225,225,225);

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

$len=strlen($string);



for($i=0;$i<$len;$i++)

{

    $xpos=$i*imagefontwidth($font_size);

    $ypos=rand(0,imagefontheight($font_size));

    imagechar($img,$font_size,$xpos,$ypos,$string,$black);

    $string = substr($string,1);    

    

}

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

imagegif($img); 

imagedestroy($img);

?>

add a note

imagecharup

imagearc

Last updated: Fri, 13 Nov 2009