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<?php
declare(strict_types = 1);
namespace BaconQrCodeTest\Renderer\Color;
use BaconQrCode\Renderer\Color\Cmyk;
use BaconQrCode\Renderer\Color\Gray;
use BaconQrCode\Renderer\Color\Rgb;
use PHPUnit\Framework\TestCase;
final class GrayTest extends TestCase
{
/**
* Tests Gray to RGB conversion, focusing on:
* 1. Using 255/100 instead of 2.55 to avoid floating-point precision loss.
* 2. Correct application of rounding.
*/
public function testToRgb() : void
{
// Black (0) -> RGB(0, 0, 0)
$grayBlack = new Gray(0);
$this->assertEquals(new Rgb(0, 0, 0), $grayBlack->toRgb(), 'Gray Black to RGB');
// White (100) -> RGB(255, 255, 255)
// 100 * 255 / 100 = 255
$grayWhite = new Gray(100);
$this->assertEquals(new Rgb(255, 255, 255), $grayWhite->toRgb(), 'Gray White to RGB');
// Midpoint (50) -> RGB(128, 128, 128)
// Check for precision and rounding: 50 * 255 / 100 = 127.5 -> round(127.5) = 128
$grayMiddle = new Gray(50);
$this->assertEquals(new Rgb(128, 128, 128), $grayMiddle->toRgb(), 'Gray 50 to RGB (rounding check)');
// Custom value (90) -> RGB(230, 230, 230)
// Check for precision and rounding: 90 * 255 / 100 = 229.5 -> round(229.5) = 230
$grayCustom = new Gray(90);
$this->assertEquals(new Rgb(230, 230, 230), $grayCustom->toRgb(), 'Gray Custom to RGB (rounding check)');
}
/**
* Tests Gray to CMYK conversion (K=100-Gray).
*/
public function testToCmyk() : void
{
// Black (0) -> K:100
$grayBlack = new Gray(0);
$this->assertEquals(new Cmyk(0, 0, 0, 100), $grayBlack->toCmyk(), 'Gray Black to CMYK');
// White (100) -> K:0
$grayWhite = new Gray(100);
$this->assertEquals(new Cmyk(0, 0, 0, 0), $grayWhite->toCmyk(), 'Gray White to CMYK');
// Middle (50) -> K:50
$grayMiddle = new Gray(50);
$this->assertEquals(new Cmyk(0, 0, 0, 50), $grayMiddle->toCmyk(), 'Gray Middle to CMYK');
}
public function testToGray() : void
{
$gray = new Gray(75);
$this->assertSame($gray, $gray->toGray(), 'toGray should return $this');
}
}
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