public function testEmptyTemperatureAfterChanging()
{
$Temperature = new Temperature(13);
$Temperature->setInPreferredUnit(null);
$this->assertTrue($Temperature->isEmpty());
$this->assertNull($Temperature->value());
$this->assertNull($Temperature->celsius());
$this->assertNull($Temperature->fahrenheit());
}
/**
* Calculate and set adjusted temperature
* @param \Runalyze\Data\Weather\WindSpeed $windSpeed
* @param \Runalyze\Activity\Temperature $temperature
* @param \Runalyze\Activity\Pace $activitySpeed
* @param null|\Runalyze\Activity\Pace $activitySpeed
* @throws \InvalidArgumentException
* @see https://en.wikipedia.org/wiki/Wind_chill#North_American_and_United_Kingdom_wind_chill_index
*/
public function setFrom(WindSpeed $windSpeed, ActivityTemperature $temperature, Pace $activitySpeed = null)
{
if ($windSpeed->isUnknown() || $temperature->isEmpty()) {
throw new \InvalidArgumentException('Wind speed and temperature must be known. Null value(s) given.');
}
$kmh = $windSpeed->inKilometerPerHour();
$calc = $temperature->celsius();
if (null !== $activitySpeed) {
$kmh = $windSpeed->inKilometerPerHour() + $activitySpeed->asKmPerHour();
}
if ($kmh >= 5) {
$calc = 13.12 + 0.6215000000000001 * $temperature->celsius() - 11.37 * pow($kmh, 0.16) + 0.3965 * $temperature->celsius() * pow($kmh, 0.16);
}
$this->AdjustedTemperature = clone $temperature;
$this->AdjustedTemperature->set($calc);
}
