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<?php |
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/** |
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* Copyright (C) 2018-2019 Graham Breach |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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/** |
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* For more information, please contact <graham@goat1000.com> |
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*/ |
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|
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namespace Goat1000\SVGGraph; |
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|
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class Symbols { |
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|
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private $graph; |
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private $symbols = []; |
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private $use_count = []; |
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private $empty_use; |
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|
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public function __construct(&$graph) |
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{ |
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$this->graph =& $graph; |
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$this->empty_use = $graph->getOption('empty_use'); |
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} |
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|
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/** |
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* Defines a symbol, returning its ID |
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*/ |
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public function define($content) |
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{ |
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// if this is a duplicate, return existing ID |
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foreach($this->symbols as $id => $def) { |
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if($def == $content) |
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return $id; |
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} |
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|
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$id = $this->graph->newID(); |
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$this->symbols[$id] = $content; |
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return $id; |
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} |
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|
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/** |
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* Uses an existing symbol |
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*/ |
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public function useSymbol($id, $attr, $style = null) |
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{ |
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if(!isset($this->symbols[$id])) |
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throw new \Exception('Symbol ' . $id . ' not defined'); |
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|
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if(isset($this->use_count[$id])) |
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++$this->use_count[$id]; |
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else |
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$this->use_count[$id] = 1; |
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|
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$uattr = array_merge($attr, ['xlink:href' => '#' . $id]); |
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return $this->graph->element('use', $uattr, $style, |
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$this->empty_use ? '' : null); |
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} |
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|
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/** |
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* Returns symbol use count |
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*/ |
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public function useCount($id) |
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{ |
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if(isset($this->use_count[$id])) |
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return $this->use_count[$id]; |
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return 0; |
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} |
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|
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/** |
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* Outputs the list of used definitions |
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*/ |
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public function definitions() |
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{ |
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$defs = ''; |
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foreach($this->use_count as $id => $count) { |
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$defs .= $this->graph->element('symbol', null, null, |
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$this->graph->element('g', ['id' => $id], null, |
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$this->symbols[$id])); |
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} |
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|
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return $defs; |
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} |
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} |
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|
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|
