/**
* {@inheritdoc}
*/
public function color($color, $alpha = null)
{
if (null === $alpha) {
$alpha = 0;
}
$color = $this->parser->parseToGrayscale($color);
$index = sprintf('#%02x%02x%02x-%d', $color[0], $color[0], $color[0], $alpha);
if (false === array_key_exists($index, static::$colors)) {
static::$colors[$index] = new GrayColor($this, $color, $alpha);
}
return static::$colors[$index];
}
/**
* @dataProvider provideGrayscaledataThatFail
* @expectedException Imagine\Exception\InvalidArgumentException
*/
public function testParseToGrayscaleThatFails($value)
{
$parser = new ColorParser();
$parser->parseToGrayscale($value);
}
