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<?php |
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/** |
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* Copyright (C) 2017-2022 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 PieExploder { |
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|
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protected $graph; |
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protected $smallest_value; |
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protected $largest_value; |
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protected $explode; |
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protected $explode_amount; |
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protected $reverse; |
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protected $auto_aspect; |
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protected $radius_x; |
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protected $radius_y; |
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|
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public function __construct(&$graph, $smallest, $largest) |
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{ |
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$this->graph =& $graph; |
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$this->smallest_value = $smallest; |
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$this->largest_value = $largest; |
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$this->explode = $graph->getOption('explode'); |
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$this->reverse = $graph->getOption('reverse'); |
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$amount = $graph->getOption('explode_amount'); |
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$this->explode_amount = is_numeric($amount) ? $amount : 20; |
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$this->auto_aspect = ($graph->getOption('aspect_ratio') == 'auto'); |
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} |
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|
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/** |
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* Reduces the radii to fit the exploded portion |
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*/ |
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public function fixRadii(&$radius_x, &$radius_y) |
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{ |
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$this->explode_amount = min($radius_x - 10, $radius_y - 10, |
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max(2, (int)$this->explode_amount)); |
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if($this->auto_aspect && $radius_x != $radius_y) { |
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$mx = $my = 1.0; |
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if($radius_x > $radius_y) { |
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$my = $radius_y / $radius_x; |
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} else { |
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$mx = $radius_x / $radius_y; |
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} |
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$radius_x -= $this->explode_amount * $mx; |
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$radius_y -= $this->explode_amount * $my; |
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} else { |
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$radius_x -= $this->explode_amount; |
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$radius_y -= $this->explode_amount; |
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} |
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$this->radius_x = $radius_x; |
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$this->radius_y = $radius_y; |
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return $this->explode_amount; |
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} |
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|
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/** |
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* Returns the x,y offset caused by explosion |
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*/ |
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public function getExplode($item, $angle_start, $angle_end) |
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{ |
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if($item === null) |
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return [0,0]; |
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$iamt = $item->explode; |
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if($iamt !== null) { |
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$amt = $iamt; |
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} else { |
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$range = $this->largest_value - $this->smallest_value; |
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switch($this->explode) { |
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case 'none' : |
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$amt = 0; |
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break; |
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case 'all' : |
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$amt = 1; |
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break; |
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case 'large' : |
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$amt = $range <= 0 ? 0 : ($item->value - $this->smallest_value) / $range; |
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break; |
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default : |
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$amt = $range <= 0 ? 0 : ($this->largest_value - $item->value) / $range; |
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} |
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} |
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$explode = $this->explode_amount * $amt; |
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$explode_direction = $angle_start + ($angle_end - $angle_start) * 0.5; |
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$xo = $explode * cos($explode_direction); |
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$yo = $explode * sin($explode_direction); |
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|
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$aspect = $this->radius_y / $this->radius_x; |
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if($aspect < 1.0) |
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$yo *= $aspect; |
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elseif($aspect > 1.0) |
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$xo /= $aspect; |
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if($this->reverse) |
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$yo = -$yo; |
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|
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return [$xo, $yo]; |
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} |
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} |
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|
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