From ceb29cc42fb126cac294d3d8be32c123c1d03248 Mon Sep 17 00:00:00 2001
From: Syntriax <syntriax@gmail.com>
Date: Fri, 26 Jan 2024 19:01:53 +0300
Subject: [PATCH] feat: Shape.CreateNgon

---
 Engine.Physics2D/Primitives/Shape.cs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Engine.Physics2D/Primitives/Shape.cs b/Engine.Physics2D/Primitives/Shape.cs
index 5dbc804..5aa4c10 100644
--- a/Engine.Physics2D/Primitives/Shape.cs
+++ b/Engine.Physics2D/Primitives/Shape.cs
@@ -12,6 +12,22 @@ public record Shape(IList<Vector2D> Vertices) : IEnumerable<Vector2D>
 
     public static Shape CreateCopy(Shape shape) => new(new List<Vector2D>(shape.Vertices));
 
+    public static Shape CreateNgon(int vertexCount) => CreateNgon(vertexCount, Vector2D.Up);
+    public static Shape CreateNgon(int vertexCount, Vector2D positionToRotate)
+    {
+        if (vertexCount < 3)
+            throw new System.ArgumentException($"{nameof(vertexCount)} must have a value of more than 2.");
+
+        List<Vector2D> vertices = new(vertexCount);
+
+        float radiansPerVertex = 360f / vertexCount * Math.DegreeToRadian;
+
+        for (int i = 0; i < vertexCount; i++)
+            vertices.Add(positionToRotate.Rotate(i * radiansPerVertex));
+
+        return new(vertices);
+    }
+
     public static Triangle GetSuperTriangle(Shape shape)
     {
         float minX = float.MaxValue, minY = float.MaxValue;