1<?php 2/** 3 * webtrees: online genealogy 4 * Copyright (C) 2015 webtrees development team 5 * This program is free software: you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation, either version 3 of the License, or 8 * (at your option) any later version. 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * You should have received a copy of the GNU General Public License 14 * along with this program. If not, see <http://www.gnu.org/licenses/>. 15 */ 16namespace Fisharebest\Webtrees; 17 18/** 19 * Generate a range of colurs for the lifespan chart. 20 */ 21class ColorGenerator { 22 /** @var int Current hue */ 23 private $hue; 24 25 /** @var int Initial hue*/ 26 private $basehue; 27 28 /** @var int Saturation */ 29 private $saturation; 30 31 /** @var int Lightness */ 32 private $lightness; 33 34 /** @var int Initial lightness*/ 35 private $baselightness; 36 37 /** @var int Alpha transparancy */ 38 private $alpha; 39 40 /** @var int Clockwise or anticlockwise color wheel */ 41 private $range; 42 43 /** 44 * Create a color generator. 45 * 46 * @param int $hue (0Deg = Red, 120Deg = green, 240Deg = blue) 47 * @param int $saturation 48 * @param int $lightness 49 * @param int $alpha 50 * @param int $range (sign determines direction. positive = clockwise, negative = anticlockwise) 51 */ 52 public function __construct($hue, $saturation, $lightness, $alpha, $range) { 53 $this->hue = $hue; 54 $this->basehue = $hue; 55 $this->saturation = $saturation; 56 $this->lightness = $lightness; 57 $this->baselightness = $lightness; 58 $this->alpha = $alpha; 59 $this->range = $range; 60 } 61 62 /** 63 * Function getNextColor 64 * 65 * $lightness cycles between $baselightness and 100% in $lightnessStep steps 66 * $hue cycles on each complete $lightness cycle 67 * between $basehue and $basehue + $range degrees in $hueStep degrees 68 * 69 * @param int $lightnessStep 70 * @param int $hueStep 71 * 72 * @return string 73 */ 74 public function getNextColor($lightnessStep = 10, $hueStep = 15) { 75 $lightness = $this->lightness + $lightnessStep; 76 $hue = $this->hue; 77 78 if ($lightness >= 100) { 79 $lightness = $this->baselightness; 80 $hue += $hueStep * (abs($this->range) / $this->range); 81 if (($hue - $this->basehue) * ($hue - ($this->basehue + $this->range)) >= 0) { 82 $hue = $this->basehue; 83 } 84 $this->hue = $hue; 85 } 86 $this->lightness = $lightness; 87 88 return sprintf("hsla(%s, %s%%, %s%%, %s)", 89 $this->hue, 90 $this->saturation, 91 $this->lightness, 92 $this->alpha); 93 } 94 95} 96