68 lines
1.2 KiB
C#
68 lines
1.2 KiB
C#
using System;
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namespace _2DGAMELIB;
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public static class Vec
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{
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public static void Add(ref Vector2D v1, ref Vector2D v2, out Vector2D r)
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{
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r.X = v1.X + v2.X;
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r.Y = v1.Y + v2.Y;
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}
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public static void Subtract(ref Vector2D v1, ref Vector2D v2, out Vector2D r)
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{
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r.X = v1.X - v2.X;
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r.Y = v1.Y - v2.Y;
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}
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public static double DistanceSquared(this Vector2D v1, Vector2D v2)
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{
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double num = v1.X - v2.X;
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double num2 = v1.Y - v2.Y;
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return num * num + num2 * num2;
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}
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public static void Dot(ref Vector2D v1, ref Vector2D v2, out double r)
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{
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r = v1.X * v2.X + v1.Y * v2.Y;
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}
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public static double Cross(ref Vector2D v1, ref Vector2D v2)
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{
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return v1.X * v2.Y - v1.Y * v2.X;
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}
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public static Vector2D newNormalize(this Vector2D vector)
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{
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vector.Normalize();
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return vector;
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}
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public static double Angle(ref Vector2D v1, ref Vector2D v2)
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{
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Dot(ref v1, ref v2, out var r);
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r /= v1.Length() * v2.Length();
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if (r > 1.0)
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{
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r = 1.0;
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}
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else if (r < -1.0)
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{
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r = -1.0;
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}
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return System.Math.Acos(r);
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}
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public static double Angle02π(this Vector2D v1, Vector2D v2)
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{
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double num = Angle(ref v1, ref v2);
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if (Cross(ref v1, ref v2) < 0.0)
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{
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num = System.Math.PI * 2.0 - num;
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}
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return num;
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}
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}
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