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<?php |
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declare(strict_types=1); |
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namespace ExtendedStrings\Harmonics; |
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class VibratingString |
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{ |
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private $frequency; |
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/** |
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* @param float $frequency |
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*/ |
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public function __construct(float $frequency) |
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{ |
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$this->frequency = $frequency; |
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} |
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/** |
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* @param float $stringLength |
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* |
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* @return float |
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*/ |
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View Code Duplication |
public function getStoppedFrequency(float $stringLength = 1.0): float |
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{ |
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if (Math::isZero($stringLength)) { |
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return 0; |
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} |
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$centsOverString = Cent::frequenciesToCents($stringLength, 1); |
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return Cent::centsToFrequency($centsOverString, $this->frequency); |
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} |
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/** |
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* @param float $stringLength |
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* |
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* @return float |
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*/ |
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public function getHarmonicSoundingFrequency(float $stringLength = 1.0): float |
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{ |
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return Math::isZero($stringLength) |
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? 0 |
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: $this->frequency * self::getHarmonicNumber($stringLength); |
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} |
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/** |
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* @param float $frequency |
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* |
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* @return float |
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*/ |
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View Code Duplication |
public function getStringLength(float $frequency): float |
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{ |
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if (Math::isZero($frequency)) { |
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return 0; |
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} |
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$centsOverString = Cent::frequenciesToCents($this->frequency, $frequency); |
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return $this->centsToStringLength($centsOverString); |
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} |
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/** |
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* @param float $cents |
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* The number of cents between the open string and the stop. |
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* |
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* @return float |
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* The length of the remaining vibrating string. |
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*/ |
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private function centsToStringLength(float $cents): float |
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{ |
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return 1 / pow(2, $cents / 1200); |
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} |
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/** |
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* @param float $stringLength |
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* |
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* @throws \InvalidArgumentException |
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* |
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* @return int |
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*/ |
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public static function getHarmonicNumber(float $stringLength): int |
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{ |
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$number = intval(1 / Math::gcd(1, $stringLength)); |
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if ($number > 100) { |
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throw new \InvalidArgumentException(sprintf('Invalid string length for a harmonic: %f', $stringLength)); |
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} |
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return $number; |
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} |
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/** |
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* @param int $limit |
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* |
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* @return float[] |
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*/ |
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public static function getHarmonicSeries(int $limit): array |
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{ |
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$series = []; |
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$base = 0; |
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for ($denominator = 1; $denominator <= $limit; $denominator++) { |
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$base = $series[$denominator] = $base + 1 / $denominator; |
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} |
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return $series; |
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} |
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} |
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extended-strings /
strings
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Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation.
You can also find more detailed suggestions in the “Code” section of your repository.