public function testFilter()
{
$image = $this->getOriginalImage(ImageType::PNG);
$filter = new ImageFilterGrayScale();
$rasterizer = new Rasterizer($image, new GridRasterStrategy(25, 25, true));
$segments = $rasterizer->getSegments();
$rasterizer->filter($filter, $segments->offsetGet(0));
$rasterizer->filter($filter, $segments->offsetGet(5));
$originalColor = "ff0000";
$filteredColor = "4c4c4c";
$color = ColorUtil::getColorAt($rasterizer->getResource(), Coordinate::create(50, 50));
$this->assertEquals($filteredColor, $color->getHexColor());
$color = ColorUtil::getColorAt($rasterizer->getResource(), Coordinate::create(160, 50));
$this->assertEquals($originalColor, $color->getHexColor());
$color = ColorUtil::getColorAt($rasterizer->getResource(), Coordinate::create(50, 160));
$this->assertEquals($originalColor, $color->getHexColor());
$color = ColorUtil::getColorAt($rasterizer->getResource(), Coordinate::create(160, 160));
$this->assertEquals($filteredColor, $color->getHexColor());
}
