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<?php
/**
* webtrees: online genealogy
* Copyright (C) 2015 webtrees development team
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU 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 General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
namespace Fisharebest\Webtrees;
/**
* Generate a range of colurs for the lifespan chart.
*/
class ColorGenerator {
/** @var int Current hue */
private $hue;
/** @var int Initial hue*/
private $basehue;
/** @var int Saturation */
private $saturation;
/** @var int Lightness */
private $lightness;
/** @var int Initial lightness*/
private $baselightness;
/** @var int Alpha transparancy */
private $alpha;
/** @var int Clockwise or anticlockwise color wheel */
private $range;
/**
* Create a color generator.
*
* @param int $hue (0Deg = Red, 120Deg = green, 240Deg = blue)
* @param int $saturation
* @param int $lightness
* @param int $alpha
* @param int $range (sign determines direction. positive = clockwise, negative = anticlockwise)
*/
public function __construct($hue, $saturation, $lightness, $alpha, $range) {
$this->hue = $hue;
$this->basehue = $hue;
$this->saturation = $saturation;
$this->lightness = $lightness;
$this->baselightness = $lightness;
$this->alpha = $alpha;
$this->range = $range;
}
/**
* Function getNextColor
*
* $lightness cycles between $baselightness and 100% in $lightnessStep steps
* $hue cycles on each complete $lightness cycle
* between $basehue and $basehue + $range degrees in $hueStep degrees
*
* @param int $lightnessStep
* @param int $hueStep
*
* @return string
*/
public function getNextColor($lightnessStep = 10, $hueStep = 15) {
$lightness = $this->lightness + $lightnessStep;
$hue = $this->hue;
if ($lightness >= 100) {
$lightness = $this->baselightness;
$hue += $hueStep * (abs($this->range) / $this->range);
if (($hue - $this->basehue) * ($hue - ($this->basehue + $this->range)) >= 0) {
$hue = $this->basehue;
}
$this->hue = $hue;
}
$this->lightness = $lightness;
return sprintf("hsla(%s, %s%%, %s%%, %s)",
$this->hue,
$this->saturation,
$this->lightness,
$this->alpha);
}
}
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