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<?php |
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/** |
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* Copyright (C) 2020 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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/** |
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* Deal with the strange way population pyramids work |
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*/ |
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class PopulationPyramidAverage extends Average { |
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|
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private $graph; |
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private $lines = []; |
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|
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/** |
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* Calculates the mean average for a dataset |
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*/ |
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protected function calculate(&$values, $dataset) |
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{ |
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$val = parent::calculate($values, $dataset); |
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if($val === null) |
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return $val; |
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|
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return $dataset % 2 ? $val : -$val; |
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} |
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|
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/** |
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* Need to sign-correct the average value for display |
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*/ |
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protected function getTitle(&$graph, $avg, $dataset) |
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{ |
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return parent::getTitle($graph, $dataset % 2 ? $avg : -$avg, $dataset); |
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} |
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} |
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|
