Leonid PershinandClaude Opus 4.8
53659450a6
CI / build-test (push) Successful in 1m14s
Introduce a WorldGen module under Simulation with reusable helpers for seed-based terrain heightmaps: PerlinNoise (deterministic 2D gradient noise), FractalNoise (fBm over octaves), Falloff (island edge masks), Heightmap (row-major grid with min-max normalize) and HeightmapGenerator (settings to normalized heightmap). All deterministic from an integer seed, allocation-free per sample, covered by xUnit tests. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
65 lines
1.7 KiB
C#
65 lines
1.7 KiB
C#
namespace MrGameEng.WorldGen;
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/// <summary>
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/// A dense row-major grid of height values. Plain data with indexed access — fill it from a
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/// <see cref="HeightmapGenerator"/> and read it from worldgen code. Values are arbitrary until
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/// <see cref="Normalize"/> rescales them into <c>[0, 1]</c>.
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/// </summary>
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public sealed class Heightmap
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{
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/// <summary>Grid width in cells.</summary>
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public int Width { get; }
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/// <summary>Grid height in cells.</summary>
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public int Height { get; }
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/// <summary>Row-major values, length <see cref="Width"/>×<see cref="Height"/>.</summary>
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public float[] Values { get; }
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/// <summary>Creates an all-zero map of the given size.</summary>
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public Heightmap(int width, int height)
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{
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Width = width;
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Height = height;
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Values = new float[width * height];
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}
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/// <summary>Height at (<paramref name="x"/>, <paramref name="y"/>).</summary>
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public float this[int x, int y]
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{
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get => Values[y * Width + x];
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set => Values[y * Width + x] = value;
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}
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/// <summary>Rescales all values into <c>[0, 1]</c> by min–max; a flat map becomes all zeros.</summary>
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public void Normalize()
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{
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var min = float.MaxValue;
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var max = float.MinValue;
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foreach (var v in Values)
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{
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if (v < min)
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{
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min = v;
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}
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if (v > max)
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{
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max = v;
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}
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}
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var range = max - min;
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if (range <= float.Epsilon)
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{
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Array.Clear(Values);
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return;
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}
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for (var i = 0; i < Values.Length; i++)
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{
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Values[i] = (Values[i] - min) / range;
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}
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}
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}
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