<?php
/**
 * Copyright (C) 2021-2022 Graham Breach
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
/**
 * For more information, please contact <graham@goat1000.com>
 */

namespace Goat1000\SVGGraph;

trait SteppedLineTrait {

  /**
   * Double each point to create a stepped line
   */
  protected function getLinePoints($points)
  {
    $new_points = [];
    $prev = null;
    foreach($points as $point) {
      if($prev) {
        $prev[0] = $point[0];
        $new_points[] = $prev;
      }
      $new_points[] = $point;
      $prev = $point;
    }

    return $new_points;
  }
}