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* * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Imagine\Image\Palette\Color; use Imagine\Exception\InvalidArgumentException; use Imagine\Image\Palette\Grayscale; final class Gray implements ColorInterface { /** * @var int */ private $gray; /** * @var int */ private $alpha; /** * @var \Imagine\Image\Palette\Grayscale */ private $palette; /** * @param \Imagine\Image\Palette\Grayscale $palette * @param int[] $color * @param int $alpha */ public function __construct(Grayscale $palette, array $color, $alpha) { $this->palette = $palette; $this->setColor($color); $this->setAlpha($alpha); } /** * {@inheritdoc} * * @see \Imagine\Image\Palette\Color\ColorInterface::getValue() */ public function getValue($component) { switch ($component) { case ColorInterface::COLOR_GRAY: return $this->getGray(); default: throw new InvalidArgumentException(sprintf('Color component %s is not valid', $component)); } } /** * Returns Gray value of the color (from 0 to 255). * * @return int */ public function getGray() { return $this->gray; } /** * {@inheritdoc} * * @see \Imagine\Image\Palette\Color\ColorInterface::getPalette() */ public function getPalette() { return $this->palette; } /** * {@inheritdoc} * * @see \Imagine\Image\Palette\Color\ColorInterface::getAlpha() */ public function getAlpha() { return $this->alpha; } /** * {@inheritdoc} * * @see \Imagine\Image\Palette\Color\ColorInterface::dissolve() */ public function dissolve($alpha) { return $this->palette->color( array($this->gray), min(max((int) round($this->alpha + $alpha), 0), 100) ); } /** * {@inheritdoc} * * @see \Imagine\Image\Palette\Color\ColorInterface::lighten() */ public function lighten($shade) { return $this->palette->color(array(min(255, $this->gray + $shade)), $this->alpha); } /** * {@inheritdoc} * * @see \Imagine\Image\Palette\Color\ColorInterface::darken() */ public function darken($shade) { return $this->palette->color(array(max(0, $this->gray - $shade)), $this->alpha); } /** * {@inheritdoc} * * @see \Imagine\Image\Palette\Color\ColorInterface::grayscale() */ public function grayscale() { return $this; } /** * {@inheritdoc} * * @see \Imagine\Image\Palette\Color\ColorInterface::isOpaque() */ public function isOpaque() { return $this->alpha === 100; } /** * {@inheritdoc} * * @see \Imagine\Image\Palette\Color\ColorInterface::__toString() */ public function __toString() { return sprintf('#%02x%02x%02x', $this->gray, $this->gray, $this->gray); } /** * Performs checks for validity of given alpha value and sets it. * * @param int $alpha * * @throws \Imagine\Exception\InvalidArgumentException */ private function setAlpha($alpha) { if (!is_int($alpha) || $alpha < 0 || $alpha > 100) { throw new InvalidArgumentException(sprintf('Alpha must be an integer between 0 and 100, %s given', $alpha)); } $this->alpha = $alpha; } /** * Performs checks for color validity (array of array(gray)). * * @param int[] $color * * @throws \Imagine\Exception\InvalidArgumentException */ private function setColor(array $color) { if (count($color) !== 1) { throw new InvalidArgumentException('Color argument must look like array(gray), where gray is the integer value between 0 and 255 for the grayscale'); } $color = array_values($color); $color[0] = max(0, min(255, $color[0])); list($this->gray) = $color; } }