Converts RGB values to XY values
Based on: http://stackoverflow.com/a/22649803
/**
* Test: convert RGB to XY and brightness
*
* @covers \Phue\Helper\ColorConversion::convertRGBToXY
*/
public function testConvertRGBToXY()
{
// Values from: http://www.developers.meethue.com/documentation/hue-xy-values
// Alice Blue
$xy = ColorConversion::convertRGBToXY(239, 247, 255);
$this->assertEquals(0.3088, $xy['x'], '', 0.0001);
$this->assertEquals(0.3212, $xy['y'], '', 0.0001);
$this->assertEquals(233, $xy['bri']);
// Firebrick
$xy = ColorConversion::convertRGBToXY(178, 33, 33);
$this->assertEquals(0.6622, $xy['x'], '', 0.0001);
$this->assertEquals(0.3024, $xy['y'], '', 0.0001);
$this->assertEquals(35, $xy['bri']);
// Medium Sea Green
$xy = ColorConversion::convertRGBToXY(61, 178, 112);
$this->assertEquals(0.1979, $xy['x'], '', 0.0001);
$this->assertEquals(0.5004999999999999, $xy['y'], '', 0.0001);
$this->assertEquals(81, $xy['bri']);
}
/**
* Set XY and brightness calculated from RGB
*
* @param int $red Red value
* @param int $green Green value
* @param int $blue Blue value
*
* @return self This object
*/
public function setRGB($red, $green, $blue)
{
$x = new SetGroupState($this);
$y = $x->rgb((int) $red, (int) $green, (int) $blue);
$this->client->sendCommand($y);
// Change internal xy, brightness and colormode state
$xy = ColorConversion::convertRGBToXY($red, $green, $blue);
$this->attributes->action->xy = array($xy['x'], $xy['y']);
$this->attributes->action->bri = $xy['bri'];
$this->attributes->action->colormode = 'xy';
return $this;
}
/**
* Test: set XY and brightness via RGB
*
* @dataProvider providerRGB
*
* @covers \Phue\Command\SetLightState::rgb
* @covers \Phue\Command\SetLightState::send
*/
public function testRGBSend($red, $green, $blue)
{
// Build command
$command = new SetLightState($this->mockLight);
// Set expected payload
$xy = ColorConversion::convertRGBToXY($red, $green, $blue);
$this->stubTransportSendRequestWithPayload((object) array('xy' => array($xy['x'], $xy['y']), 'bri' => $xy['bri']));
// Ensure instance is returned
$this->assertEquals($command, $command->rgb($red, $green, $blue));
// Send
$command->send($this->mockClient);
}
/**
* Sets xy and brightness calculated from RGB
*
* @param int $red
* Red value
* @param int $green
* Green value
* @param int $blue
* Blue value
*
* @throws \InvalidArgumentException
*
* @return self This object
*/
public function rgb($red, $green, $blue)
{
// Don't continue if rgb values are invalid
foreach (array($red, $green, $blue) as $value) {
if (!(self::RGB_MIN <= $value && $value <= self::RGB_MAX)) {
throw new \InvalidArgumentException("RGB values must be between " . self::RGB_MIN . " and " . self::RGB_MAX);
}
}
$xy = ColorConversion::convertRGBToXY($red, $green, $blue);
return $this->xy($xy['x'], $xy['y'])->brightness($xy['bri']);
}
