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<?php |
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/** |
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* TURational class file |
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* |
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* @author Brad Anderson <[email protected]> |
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* @link https://github.com/pradosoft/prado |
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* @license https://github.com/pradosoft/prado/blob/master/LICENSE |
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*/ |
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namespace Prado\Util\Math; |
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use Prado\Util\TBitHelper; |
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/** |
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* TURational class. |
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* |
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* TURational implements a fraction in the form of one unsigned integer {@link getNumerator |
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* Numerator} divided by another unsigned integer {@link getDenominator Denominator}. |
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* |
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* TURational is a specialization of {@link TRational} and TRational has information |
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* about how these classes work. |
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* |
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* INF is "4294967295/0" and NAN (Not A Number) has the denominator equal zero |
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* (to avoid a divide by zero error). |
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* |
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* When setting a {@link setNumerator Numerator} and {@link setDenominator Denominator}, |
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* the PHP instance is checked if it is 32 bit or 64 bit. 64 Bit PHP can represent |
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* integers in the range [2147483648, 4294967295] as an integer, but on a 32 bit |
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* PHP instance, these high bit integers are converted to float to be more accurately |
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* represented. |
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* |
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* The Rational data format is used by EXIF and, in particular, the GPS Image File |
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* Directory. |
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* |
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* @author Brad Anderson <[email protected]> |
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* @see TRational |
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* @since 4.2.3 |
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*/ |
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class TURational extends TRational |
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{ |
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/** |
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* @return bool Is the class unsigned. Returns true. |
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*/ |
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public static function getIsUnsigned(): bool |
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{ |
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return true; |
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} |
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/** |
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* This only accepts 0 and positive values. For 32 bit systems this accepts a float |
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* to represent numbers larger than PHP_INT_MAX. |
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* @param float|int|string $value The numerator. |
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*/ |
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public function setNumerator($value): TURational |
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{ |
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$value = min(max(0, $value), TBitHelper::PHP_INT32_UMAX); |
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if (PHP_INT_SIZE > 4 || $value <= PHP_INT_MAX) { |
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$this->_numerator = (int) $value; |
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} else { |
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$this->_numerator = (float) $value; |
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} |
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return $this; |
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} |
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/** |
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* This only accepts 0 and positive values. For 32 bit systems this accepts a float |
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* to represent numbers larger than PHP_INT_MAX. |
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* @param float|int|string $value The denominator. |
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*/ |
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public function setDenominator($value): TURational |
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{ |
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$value = min(max(0, $value), TBitHelper::PHP_INT32_UMAX); |
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if (PHP_INT_SIZE > 4 || $value <= PHP_INT_MAX) { |
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$this->_denominator = (int) $value; |
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} else { |
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$this->_denominator = (float) $value; |
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} |
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return $this; |
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} |
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/** |
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* This returns the float value of the Numerator divided by the denominator. |
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* Returns INF (Infinity) float value if the {@link getNumerator Numerator} is |
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* 0xFFFFFFFF (4294967295) and {@link getDenominator Denominator} is 0. Returns |
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* NAN (Not A Number) float value if the {@link getDenominator Denominator} is zero. |
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* @return float The float value of the Numerator divided by denominator. |
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*/ |
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public function getValue(): float |
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{ |
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if ($this->_numerator === TBitHelper::PHP_INT32_UMAX && $this->_denominator === 0) { |
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return INF; |
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} |
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if ($this->_denominator === 0) { |
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return NAN; |
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} |
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return ((float) $this->_numerator) / ((float) $this->_denominator); |
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} |
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} |
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pradosoft /
prado
