Watermark Demo

Click refresh to see the watermark move.

You will need two files like the following:

• baby.jpg (as found here)
• copyright.png (as found here)

However, use your own images -- not the ones provided above.

Please note, the watermark image has to be transparent.

Also please note where the images should reside (i.e., images directory).

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SLAVE CODE FOLLOWS

<?php
// combine two images (i.e., jpg/png) to create a watermark

// NOTE: The watermark image must be smaller than the target image ( we got one more to do for week 15 assignment)
// and the background of the watermark image has to be transparent

// get the images from files
$image = imagecreatefromjpeg("iig/small_Luna.jpg");
$watermark = imagecreatefrompng("iig/IMG_2873.png");

// get sizes
$osx = imagesx($image);
$osy = imagesy($image);
$wsx = imagesx($watermark);
$wsy = imagesy($watermark);

// create a random placement for watermark
switch (rand(1, 5)) {
    case 1:  // center
        imagecopy($image, $watermark, ($osx - $wsx) / 2, ($osy - $wsy) / 2, 0, 0, $wsx, $wsy);
        break;

    case 2:  // top-left
        imagecopy($image, $watermark, 0, 0, 0, 0, $wsx, $wsy);
        break;

    case 3:  // bottom-left
        imagecopy($image, $watermark, 0, ($osy - $wsy), 0, 0, $wsx, $wsy);
        break;

    case 4:  // top-right
        imagecopy($image, $watermark, ($osx - $wsx), 0, 0, 0, $wsx, $wsy);
        break;

    case 5:  // bottom-right
        imagecopy($image, $watermark, ($osx - $wsx), ($osy - $wsy), 0, 0, $wsx, $wsy);
        break;
}

// set the header for the image
header("Content-type: image/png");
imagepng($image);
imagedestroy($image);
?>

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CODE FOLLOWS

<?php
    include('includes/header.php');
?>

    <h1>
        Watermark Demo
    </h1>

    <p>
        Click refresh to see the watermark move.
    </p>

    <img src="watermark.php" alt="This is a watermark"> <!-- this is it -->

    <p>
        You will need two files like the following:
    </p>

    <ul>
        <li>
            <a href="iig/small_Luna.jpg">baby.jpg (as found here</a>)
        </li>
        <li>
            <a href="iig/IMG_2873.png">copyright.png (as found here</a>)
        </li>
    </ul>

    <p>
        However, use your own images -- not the ones provided above.
    </p>

    <p>
        Please note, the watermark image has to be transparent.
    </p>

    <p>
        Also please note where the images should reside (i.e., images directory).
    </p>

<?php

    // list code for slave routine
    echo('<hr><br>SLAVE CODE FOLLOWS<br><br>');
    highlight_file('watermark.php');

    include('includes/footer.php');
?>

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