imagechar

(PHP 4, PHP 5)

imagechar — Draw a character horizontally

설명

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

imagechar() draws the first character of c in the image identified by image with its upper-left at x,y (top left is 0, 0) with the color color.

인수

image: imagecreatetruecolor() 등의 이미지 생성 함수에서 반환한 이미지 자원.
font: litin2 인코딩의 내장 글꼴 1, 2, 3, 4, 5(큰 숫자가 큰 글꼴)나 imageloadfont()로 등록한 글꼴 식별자를 사용할 수 있습니다.
x: x-coordinate of the start.
y: y-coordinate of the start.
c: The character to draw.
color: A color identifier created with imagecolorallocate().

반환값

성공할 경우 TRUE를, 실패할 경우 FALSE를 반환합니다.

예제

Example #1 imagechar() example


<?php

$im = imagecreate(100, 100);

$string = 'PHP';

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

// prints a black "P" in the top left corner
imagechar($im, 1, 0, 0, $string, $black);

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

?>

위 예제의 출력 예시:

참고

imagecharup() - Draw a character vertically
imageloadfont() - Load a new font

add a note User Contributed Notes imagechar

liam dot wiltshire at lineone dot net 29-Mar-2009 03:11


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 08:35


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);

?>

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