<?php
/**
* Prevent direct call
*/
if ( !defined( 'WPINC' ) ) die;
/**
* SVG Class
*
* Create and render SVG maps from files, strings and render svg tags.
*
*/
class GW_GoPortfolio_Svg {
/**
* Array of svg symbols (map)
*
* @access protected
* @var array
*/
protected $symbols = array();
/**
* Constructor of the class
*
* @return void
*/
public function __construct() {
}
/**
* Add svg symbols to svg map from file.
*
* @param string $file Svg file.
* @param bool $overwrite Items with existing ids will be skipped or overwritten.
* @return null|false Null on success, false on failure.
*/
public function load( $file, $overwrite = false ) {
$file = trim( $file );
if ( !file_exists( $file ) || !is_file( $file ) ) return false;
$content = @file_get_contents( $file );
if ( $content === false ) return false;
return $this->map_svg( $content, $overwrite );
}
/**
* Add svg symbols to svg map from string.
*
* @param string $content Svg HTML content.
* @param bool $overwrite Items with existing ids will be skipped or overwritten.
* @return null|false Null on success, false on failure.
*/
public function add( $content, $overwrite = false ) {
$content = trim( $content );
if ( !strlen( $content ) ) return false;
return $this->map_svg( $content, $overwrite );
}
/**
* Remove item(s) from svg map.
*
* @param null|string $id ID of the item, removes all items if null.
* @return bool True on success, false on failure.
*/
public function remove( $id = null ) {
if ( empty( $this->symbols ) ) return false;
if ( is_null( $id ) ) {
$this->symbols = array();
} else {
$id = trim( (string)$id );
if ( !isset( $this->symbols[$id] ) ) return false;
unset( $this->symbols[$id] );
}
return true;
}
/**
* Return item(s) from svg map.
*
* @param null|string $id ID of the item, retuns all items if null.
* @return array|false Array of items on success and $id is set item array when $id is null, false on failure.
*/
public function get( $id = null ) {
if ( empty( $this->symbols ) ) return false;
if ( is_null( $id ) ) {
return $this->symbols;
} else {
$id = trim( (string)$id );
if ( !isset( $this->symbols[$id] ) ) return false;
return $this->symbols[$id];
}
}
/**
* SVG mapping function.
* Walks SVG find symbols, remove unnecessary tags (nodes) and attributes.
*
* @access private
*
* @param string $data Data to fetch the svg from.
* @param bool $overwrite Items with existing ids will be skipped or overwritten.
* @return int Number of symbols found.
*/
private function map_svg( $data, $overwrite = false ) {
$count = 0;
$svg = new DOMDocument();
@$svg->loadXML( $data );
foreach( $svg->getElementsByTagName( 'symbol' ) as $symbol ) {
if ( strlen( $symbol->getAttribute( 'id' ) ) ) {
$innerHTML = '';
$children = $symbol->childNodes;
foreach ( $children as $child ) {
// Skip unused nodes
switch( $child->nodeName ) {
case '#text' :
case 'title' :
case 'desc' :
break;
default:
$innerHTML .= $svg->saveXML( $child );
}
}
if ( !filter_var( $overwrite, FILTER_VALIDATE_BOOLEAN ) && isset( $this->symbols[$symbol->getAttribute( 'id' )] ) ) continue;
// Apply only important attributes (id & viewBox)
$this->symbols[$symbol->getAttribute( 'id' )] = array(
'id' => $symbol->getAttribute( 'id' ),
'viewbox' => $symbol->getAttribute( 'viewBox' ),
'content' => $innerHTML
);
$count++;
}
}
return $count;
}
/**
* Renders SVG sprite from the map database.
*
* @param string|array $id ID or array of ID to render in the sprite.
* @param bool $print Whether to print or only return the generated HTML.
* @return mixed String when $print is true, null when false.
*/
public function render_sprite( $ids = null, $print = false ) {
if ( !is_null( $ids ) ) $ids = array_unique( array_filter( array_map( 'trim', (array)$ids ) ) );
$svg = new GW_GoPortfolio_Html( 'svg' );
$svg->set_attr( 'xmlns', 'http://www.w3.org/2000/svg' );
$svg->set_attr( 'style', 'display:none;' );
$defs = new GW_GoPortfolio_Html( 'defs' );
foreach( $this->symbols as $symbol ) {
if ( !is_null( $ids ) && !in_array( $symbol['id'], $ids ) ) continue;
$elem = new GW_GoPortfolio_Html( 'symbol');
$elem->set_attr( 'id', $symbol['id'] );
$elem->set_attr( 'viewBox', $symbol['viewbox'] );
$elem->content( $symbol['content'] );
$defs->content( $elem );
}
$svg->content( $defs );
return $svg->render( $print );
}
/**
* Renders SVG use element.
*
* @param string|array $id ID of the item.
* @param bool $print Whether to print or only return the generated HTML.
* @return mixed String when $print is true, null when false.
*/
public function show( $id, $print = false ) {
$id = trim( (string)$id );
if ( !isset( $this->symbols[$id] ) ) return false;
$svg = new GW_GoPortfolio_Html( 'svg' );
$svg->set_attr( 'viewBox', $this->symbols[$id]['viewbox'] );
$use = new GW_GoPortfolio_Html( 'use' );
$use->set_attr( 'xlink:href', sprintf( '#%s' ,$this->symbols[$id]['id'] ) );
$svg->content( $use );
return $svg->render( $print );
}
}