Christopher Wiebe
b451f83174
Captures the pre-Godot-port state of the codebase. This is the rollback anchor for the Godot port (M0 of theriapolis-rpg-implementation-plan-godot-port.md). All Phase 0 through Phase 6.5 work is included; Phase 7 is in flight. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
44 lines
1.5 KiB
C#
44 lines
1.5 KiB
C#
namespace Theriapolis.Core.Util;
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/// <summary>
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/// Lightweight 2D float vector for world-pixel-space polyline coordinates.
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/// Intentionally avoids System.Numerics to keep Core dependency-free.
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/// </summary>
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public readonly struct Vec2
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{
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public readonly float X;
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public readonly float Y;
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public Vec2(float x, float y) { X = x; Y = y; }
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public static Vec2 operator +(Vec2 a, Vec2 b) => new(a.X + b.X, a.Y + b.Y);
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public static Vec2 operator -(Vec2 a, Vec2 b) => new(a.X - b.X, a.Y - b.Y);
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public static Vec2 operator *(Vec2 a, float s) => new(a.X * s, a.Y * s);
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public static Vec2 operator *(float s, Vec2 a) => new(a.X * s, a.Y * s);
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public static Vec2 operator /(Vec2 a, float s) => new(a.X / s, a.Y / s);
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public float LengthSquared => X * X + Y * Y;
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public float Length => MathF.Sqrt(LengthSquared);
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public Vec2 Normalized
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{
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get
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{
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float len = Length;
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return len < 1e-6f ? new Vec2(0, 0) : this * (1f / len);
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}
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}
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/// <summary>90° CCW rotation — perpendicular vector.</summary>
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public Vec2 Perp => new(-Y, X);
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public static float Dot(Vec2 a, Vec2 b) => a.X * b.X + a.Y * b.Y;
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public static float DistSq(Vec2 a, Vec2 b) => (a - b).LengthSquared;
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public static float Dist(Vec2 a, Vec2 b) => (a - b).Length;
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/// <summary>Linear interpolation between a and b at parameter t.</summary>
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public static Vec2 Lerp(Vec2 a, Vec2 b, float t) => a + (b - a) * t;
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public override string ToString() => $"({X:F1}, {Y:F1})";
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}
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