Once i needed to write text over an image and generate a final image with it. In order to do it, i used the php GD library functions and a TrueType font as i wanted to use high font sizes.

TrueType php GD Library

Now, i have created a PHP class to facilitate all this process. It is compatible with the following image formats:

  • jpg / jpeg
  • png
  • gif
  • wbmp

And it allows us to positionate the text wherever we want under predefied positions or custom ones.

It is extremely simple to use, see this example:

require_once 'class.textPainter.php';
$img = new textPainter('./imgs/image.jpg', 'Hello world!!', './Franklin.ttf', 50);
$img->show();

That would be all, for the most simple case.

Demo View on GitHub

Code for my demo

As an example of how to use it, you can take a look at the code of my demo:

WRITINGOVERIMAGEFILE.PHP

<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Floating window with tabs</title>

<style>

/*
This defines the workspace where i place the demo.
*/
#container {
    text-align: left;
    background: #FFF;
    width: 865px;
    margin: 20px auto;
    padding: 20px;
    border-left: 1px solid #CCC;
    border-right: 1px solid #CCC;
    -moz-box-shadow: 0px 0px 10px #BBB;
    -webkit-box-shadow: 0px 0px 10px #BBB;
    box-shadow: 0px 0px 10px #BBB;
}
</style>

</head>
<body>


<div id="container">
    <?php
        if($_POST["sending"]=="yes"){
            if(strlen($_POST["text"]<50)){
                echo '
                    <img id="imgFinal" src="writingOverImage.php?size=50&text='.$_POST["text"].'" />

                    <img id="imgFinal" src="writingOverImage.php?x=right&y=center&size=30&r=74&g=50&b=170&text='.$_POST["text"].'" />

                    <img id="imgFinal" src="writingOverImage.php?x=left&y=bottom&size=90&text='.$_POST["text"].'" />
                ';
            }
            else{
                echo "The text is too large for my demo!! ";
            }
        }
        else{
            echo '
                <img id="imgFinal" src="writingOverImage.php?size=50&text=Hello world!!" />
            ';

        }
    ?>
    <form name="formulario" action="" method="post" class="contactoFormulario">
        <div class="caja"><input type="text" name="text" />Text you want to write over the image</div>

        <button class="botonFormulario" type="submit" name="Submit" value="Enviar" />Generate image</button>
        <input type="hidden" name="sending" value="yes" />
    </form>
</div>

</body>
</html>

WRITINGOVERIMAGE.PHP

require_once 'textPainter.php';

$x = $_GET["x"];
$y = $_GET["y"];

$R = $_GET["r"];
$G = $_GET["g"];
$B = $_GET["b"];

$size = $_GET["size"];

$text = $_GET["text"];


$img = new textPainter('./imgs/writingOverImage.jpg', $text, './Franklin.ttf', $size);

if(!empty($x) && !empty($y)){
    $img->setPosition($x, $y);
}

if(!empty($R) && !empty($G) && !empty($B)){
    $img->setTextColor($R,$G,$B);
}

$img->show();