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Code Issues

Add NextColorRgb and NextColorArgb

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Oliver Booth 2022-04-26 09:55:08 +01:00
parent 54b22ab6d9
commit 40a75e62c0
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GPG Key ID: 32A00B35503AF634
2 changed files with 56 additions and 8 deletions
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37
X10D.Tests/src/Drawing/RandomTests.cs Normal file
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@ -0,0 +1,37 @@
using System.Drawing;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using X10D.Drawing;
namespace X10D.Tests.Drawing;
[TestClass]
public class RandomTests
{
[TestMethod]
public void NextColorArgb_ShouldReturn331515e5_GivenSeed1234()
{
var random = new Random(1234);
Assert.AreEqual(Color.FromArgb(51, 21, 21, 229), random.NextColorArgb());
}
[TestMethod]
public void NextColorArgb_ShouldThrow_GivenNull()
{
Random? random = null;
Assert.ThrowsException<ArgumentNullException>(() => random!.NextColorArgb());
}
[TestMethod]
public void NextColorRgb_ShouldReturn1515e5_GivenSeed1234()
{
var random = new Random(1234);
Assert.AreEqual(Color.FromArgb(255, 21, 21, 229), random.NextColorRgb());
}
[TestMethod]
public void NextColorRgb_ShouldThrow_GivenNull()
{
Random? random = null;
Assert.ThrowsException<ArgumentNullException>(() => random!.NextColorRgb());
}
}

27
X10D/src/Drawing/RandomExtensions.cs
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@ -8,25 +8,36 @@ namespace X10D.Drawing;
public static class RandomExtensions
{
/// <summary>
/// Returns a random color.
/// Returns a color of random components for red, green, and blue.
/// </summary>
/// <param name="random">The <see cref="System.Random" /> instance.</param>
/// <returns>A <see cref="Color" /> whose red, green, and blue components are all random, and whose alpha is 255</returns>
/// <exception cref="ArgumentNullException"><paramref name="random" /> is <see langword="null" />.</exception>
public static Color NextColor(this Random random)
public static Color NextColorRgb(this Random random)
{
if (random is null)
{
throw new ArgumentNullException(nameof(random));
}
int seed = random.Next();
var seededRandom = new Random(seed);
int rgb = random.Next();
return Color.FromArgb(0xFF, (byte)(rgb >> 16 & 0xFF), (byte)(rgb >> 8 & 0xFF), (byte)(rgb & 0xFF));
}
var r = (byte)(seededRandom.Next() % (byte.MaxValue + 1));
var g = (byte)(seededRandom.Next() % (byte.MaxValue + 1));
var b = (byte)(seededRandom.Next() % (byte.MaxValue + 1));
/// <summary>
/// Returns a color composed of random components for apha, red, green, and blue.
/// </summary>
/// <param name="random">The <see cref="System.Random" /> instance.</param>
/// <returns>A <see cref="Color" /> whose alpha, red, green, and blue components are all random.</returns>
/// <exception cref="ArgumentNullException"><paramref name="random" /> is <see langword="null" />.</exception>
public static Color NextColorArgb(this Random random)
{
if (random is null)
{
throw new ArgumentNullException(nameof(random));
}
return Color.FromArgb(r, g, b);
int argb = random.Next();
return Color.FromArgb(argb);
}
}