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<?php
// VR Viewer Shortcode
// converts [vr] shortcode to an iframe viewer hosted on vr.me.sh
/**
* Scrub URL paramaters for VR viewer
* @param url_params - parameter array which is passed to the jetpack_vr_viewer
* @param url_params['url'] - url of 360 media
* @param url_params['guid'] - guid for videopress
* @param url_params['view'] - cinema, 360 - controls if panaroma view, or 360
* @param url_params['rotation'] - number for rotating media
* @param url_params['preview'] - show preview image or not
* @return url_params array or false
*/
function jetpack_vr_viewer_get_viewer_url_params( $params ) {
$url_params = array();
if ( isset( $params['rotation'] ) ) {
$url_params['rotation'] = intval( $params['rotation'], 10 );
}
if ( isset( $params['view'] ) && in_array( $params['view'], array( 'cinema', '360' ), true ) ) {
$url_params['view'] = $params['view'];
}
if ( isset( $params['preview'] ) && $params['preview'] ) {
$url_params['preview'] = 1;
}
if ( isset( $params['url'] ) ) {
return array_merge( $url_params, array( 'url' => $params['url'] ) );
} else if ( isset( $params['guid'] ) ) {
return array_merge( $url_params, array( 'guid' => $params['guid'] ) );
}
return false;
}
/**
* Get padding for IFRAME depending on view type
* @param view - string cinema, 360 - default cinema
* @return css padding
*/
function jetpack_vr_viewer_iframe_padding( $view ) {
if ( $view === '360' ) {
return '100%'; // 1:1 square aspect for 360
}
return '50%'; // 2:1 panorama aspect
}
/**
* Create HTML for VR Viewer IFRAME and wrapper
* The viewer code is hosted on vr.me.sh site which is then displayed
* within posts via an IFRAME. This function returns the IFRAME html.
* @param url_params - parameter array which is passed to the jetpack_vr_viewer
* @param url_params['url'] - url of 360 media
* @param url_params['guid'] - guid for videopress
* @param url_params['view'] - cinema, 360 - controls if panaroma view, or 360
* @param url_params['rotation'] - number for rotating media
* @param url_params['preview'] - show preview image or not
* @return html - an iframe for viewer
*/
function jetpack_vr_viewer_get_html( $url_params ) {
global $content_width;
$iframe = add_query_arg( $url_params, 'https://vr.me.sh/view/' );
// set some defaults
$maxwidth = ( isset( $content_width ) ) ? $content_width : 720;
$view = ( isset( $url_params['view'] ) ) ? $url_params['view'] : 'cinema';
$rtn = '<div style="position: relative; max-width: ' . $maxwidth . 'px; margin-left: auto; margin-right: auto; overflow: hidden;">';
$rtn .= '<div style="padding-top: '. jetpack_vr_viewer_iframe_padding( $view ).';"></div>';
$rtn .= '<iframe style="position: absolute; top: 0; right: 0; bottom: 0; left: 0; height: 100%" allowfullscreen="true" frameborder="0" width="100%" height="300" src="'.esc_url( $iframe ).'">';
$rtn .= '</iframe>';
$rtn .= '</div>';
return $rtn;
}
/**
* Convert [vr] shortcode to viewer
*
* Shortcode example:
* [vr url="https://en-blog.files.wordpress.com/2016/12/regents_park.jpg" view="360"]
*
* VR Viewer embed code:
* <div style="position: relative; max-width: 720px; margin-left: auto; margin-right: auto; overflow: hidden;">
* <div style="padding-top: 100%;"></div>
* <iframe style="position: absolute; top: 0; right: 0; bottom: 0; left: 0; height: 100%" allowfullscreen="true" frameborder="0" width="100%" height="400" src="https://vr.me.sh/view/?view=360&url=https://en-blog.files.wordpress.com/2016/12/regents_park.jpg">
* </iframe>
* </div>
*
* @return html - complete vr viewer html
*/
function jetpack_vr_viewer_shortcode( $atts ) {
$params = shortcode_atts( array(
0 => null,
'url' => null,
'src' => null,
'guid' => null,
'rotation' => null,
'view' => null,
'preview' => false,
), $atts );
// We offer a few ways to specify the URL
if ( $params[0] ) {
$params['url'] = $params[0];
} else if ( $params['src'] ) {
$params['url'] = $params['src'];
}
$url_params = jetpack_vr_viewer_get_viewer_url_params( $params );
if ( $url_params ) {
return jetpack_vr_viewer_get_html( $url_params );
}
// add check for user
if ( current_user_can( 'edit_posts' ) ) {
return '[vr] shortcode requires a data source to be given';
} else {
return '';
}
}
add_shortcode( 'vr', 'jetpack_vr_viewer_shortcode' );
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