Nazmul Hossain Nihal

<p>This allows user to add a widget that generates QrCode for every page dynamically. Whenever a visitor visits the site the widget will show qrcode for current page that the visitor is visiting. User can add the widget with and without title, define the size of the qrcode, fill color and background color. If the user finds that widget is not working because of any problem with theme user can add custom HTML tag before and after the widget. Multiple widgets can be added same time.</p>
<p>Using this you can add favicons to :</p>
<ul>
<li>Add QrCodes</li>
<li>Customize QrCodes</li>
</ul>


WpQrCode

Just another WordPress plugin for adding QrCode.

Katsushi Kawamori

<h4>Integrates Canvas into WordPress.</h4>
<ul>
<li>Provide canvas shortcode.</li>
<li>Provides a filter hook when saving the canvas.</li>
<li>It supports both mouse and touch.</li>
<li>It supports both the management screen and the public screen. The appearance of buttons and select boxes on the public screen depends on the CSS of the theme.</li>
</ul>
<h4>How to use the canvas</h4>
<span class="embed-youtube" style="text-align:center; display: block;"><iframe class="youtube-player" width="640" height="360" src="https://www.youtube.com/embed/_9XWJJbY6mQ?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation"></iframe></span>
<h4>Sample of how to use the filter hook</h4>
<ul>
<li>Shortcode for canvas display</li>
</ul>
<pre><code>echo do_shortcode( '[freecanvas height=500]' );
</code></pre>
<ul>
<li>shortcode<br />
Attribute : Default : Description<br />
width : 700 : Canvas width<br />
height : 700 : Canvas height<br />
name : The date and time string when the canvas was loaded : Unique name for this canvas<br />
form_name: null : The name of the form value you want to get<br />
form_name2: null : The name of the form value you want to get<br />
form_name3: null : The name of the form value you want to get</li>
<li>Filter hook & Function</li>
</ul>
<pre><code>/**
 * Filter hook & function for outputs a PNG image file */
 *
 * @param string $image_data  image_data.
 * @param string $name  name.
 * @param string $form_value  form_value.
 * @param string $form_value2  form_value2.
 * @param string $form_value3  form_value3.
 */
function canvas_save( $image_data, $name, $form_value, $form_value2, $form_value3 ) {
    $wp_uploads = wp_upload_dir();
    $relation_path_true = strpos( $wp_uploads['baseurl'], '../' );
    if ( $relation_path_true > 0 ) {
        $upload_dir = wp_normalize_path( realpath( $wp_uploads['basedir'] ) );
    } else {
        $upload_dir = wp_normalize_path( $wp_uploads['basedir'] );
    }
    $filename = $upload_dir . '/' . $name . '.png';
    $image = imagecreatefromstring( $image_data );
    imagepng( $image, $filename );
}
add_filter( 'free_canvas_save', 'canvas_save', 10, 5 );
</code></pre>
<ul>
<li>Filter hook<br />
Variable : Description : From<br />
$image_data : PNG image data by Base64 : Value of Canvas<br />
$name : Unique name for this canvas : Value of Free Canvas<br />
$form_value : Form value obtained from form_name : Value of Form<br />
$form_value2 : Form value obtained from form_name2 : Value of Form<br />
$form_value3 : Form value obtained from form_name3 : Value of Form</li>
</ul>


Free Canvas

Provide a canvas. Various cooperation is possible by shortcode and filter.

WpQrCode vs Free Canvas