Merge pull request #2 from MoonsideGames/doc_comments

doc comments

Bonk/AABB.cs

@@ -6,6 +6,9 @@ using MoonTools.Core.Structs;
 
 namespace MoonTools.Core.Bonk
 {
+    /// <summary>
+    /// Axis-aligned bounding box.
+    /// </summary>
     public struct AABB
     {
         public float MinX { get; private set; }

Bonk/BroadPhase/SpatialHash.cs

@@ -4,6 +4,10 @@ using MoonTools.Core.Structs;
 
 namespace MoonTools.Core.Bonk
 {
+    /// <summary>
+    /// Used to quickly check if two shapes are potentially overlapping.
+    /// </summary>
+    /// <typeparam name="T">The type that will be used to uniquely identify shape-transform pairs.</typeparam>
     public class SpatialHash<T> where T : IEquatable<T>
     {
         private readonly int cellSize;
@@ -21,6 +25,12 @@ namespace MoonTools.Core.Bonk
             return ((int)Math.Floor(x / cellSize), (int)Math.Floor(y / cellSize));
         }
 
+        /// <summary>
+        /// Inserts an element into the SpatialHash.
+        /// </summary>
+        /// <param name="id">A unique ID for the shape-transform pair.</param>
+        /// <param name="shape"></param>
+        /// <param name="transform2D"></param>
         public void Insert(T id, IShape2D shape, Transform2D transform2D)
         {
             var box = shape.AABB(transform2D);
@@ -47,6 +57,9 @@ namespace MoonTools.Core.Bonk
             }
         }
 
+        /// <summary>
+        /// Retrieves all the potential collisions of a shape-transform pair. Excludes any shape-transforms with the given ID.
+        /// </summary>
         public IEnumerable<(T, IShape2D, Transform2D)> Retrieve(T id, IShape2D shape, Transform2D transform2D)
         {
             var box = shape.AABB(transform2D);
@@ -69,6 +82,9 @@ namespace MoonTools.Core.Bonk
             }
         }
 
+        /// <summary>
+        /// Removes everything that has been inserted into the SpatialHash.
+        /// </summary>
         public void Clear()
         {
             foreach (var innerDict in hashDictionary.Values)

Bonk/IShape2D.cs

@@ -6,10 +6,19 @@ namespace MoonTools.Core.Bonk
 {
     public interface IShape2D : IEquatable<IShape2D>
     {
-        // A Support function for a Minkowski sum.
-        // A Support function gives the point on the edge of a shape based on a direction.
+        /// <summary>
+        /// A Minkowski support function. Gives the farthest point on the edge of a shape along the given direction.
+        /// </summary>
+        /// <param name="direction">A normalized Vector2.</param>
+        /// <param name="transform">A Transform for transforming the shape vertices.</param>
+        /// <returns>The farthest point on the edge of the shape along the given direction.</returns>
         Vector2 Support(Vector2 direction, Transform2D transform);
 
+        /// <summary>
+        /// Returns a bounding box based on the shape.
+        /// </summary>
+        /// <param name="transform">A Transform for transforming the shape vertices.</param>
+        /// <returns>Returns a bounding box based on the shape.</returns>
         AABB AABB(Transform2D transform);
     }
 }

Bonk/MinkowskiDifference.cs

@@ -4,6 +4,9 @@ using MoonTools.Core.Structs;
 
 namespace MoonTools.Core.Bonk
 {
+    /// <summary>
+    /// A Minkowski difference between two shapes.
+    /// </summary>
     public struct MinkowskiDifference : IEquatable<MinkowskiDifference>
     {
         private IShape2D shapeA;

Bonk/NarrowPhase/EPA2D.cs

@@ -19,7 +19,11 @@ namespace MoonTools.Core.Bonk
 
     public static class EPA2D
     {
-        // vector returned gives direction from A to B
+        /// <summary>
+        /// Returns a minimum separating vector in the direction from A to B.
+        /// </summary>
+        /// <param name="simplex">A simplex returned by the GJK algorithm.</param>
+        /// <returns></returns>
         public static Vector2 Intersect(IShape2D shapeA, Transform2D Transform2DA, IShape2D shapeB, Transform2D Transform2DB, Simplex simplex)
         {
             var simplexVertices = new PooledList<Vector2>(36, ClearMode.Always);

Bonk/NarrowPhase/GJK2D.cs

@@ -6,6 +6,9 @@ namespace MoonTools.Core.Bonk
 {
     public static class GJK2D
     {
+        /// <summary>
+        /// Tests if the two shape-transform pairs are overlapping.
+        /// </summary>
         public static bool TestCollision(IShape2D shapeA, Transform2D transformA, IShape2D shapeB, Transform2D transformB)
         {
             var minkowskiDifference = new MinkowskiDifference(shapeA, transformA, shapeB, transformB);
@@ -29,6 +32,9 @@ namespace MoonTools.Core.Bonk
             return (b - a) == Vector2.Zero || (axb.Y > 0 != bxc.Y > 0 ? CheckSimplex(simplex.WithDirections(b, c)) : (axc.Y > 0 != cxb.Y > 0 ? CheckSimplex(simplex.WithDirections(a, c)) : true));
         }
 
+        /// <summary>
+        /// Tests if the two shape-transform pairs are overlapping, and returns a simplex that can be used by the EPA algorithm to determine a miminum separating vector.
+        /// </summary>
         public static (bool, Simplex) FindCollisionSimplex(IShape2D shapeA, Transform2D transformA, IShape2D shapeB, Transform2D transformB)
         {
             var minkowskiDifference = new MinkowskiDifference(shapeA, transformA, shapeB, transformB);

Bonk/Shapes/Circle.cs

@@ -4,6 +4,9 @@ using MoonTools.Core.Structs;
 
 namespace MoonTools.Core.Bonk
 {
+    /// <summary>
+    /// A Circle is a shape defined by a radius.
+    /// </summary>
     public struct Circle : IShape2D, IEquatable<IShape2D>
     {
         public int Radius { get; private set; }

Bonk/Shapes/Line.cs

@@ -5,6 +5,9 @@ using MoonTools.Core.Structs;
 
 namespace MoonTools.Core.Bonk
 {
+    /// <summary>
+    /// A line is a shape defined by exactly two points in space.
+    /// </summary>
     public struct Line : IShape2D, IEquatable<IShape2D>
     {
         private Position2D v0;

Bonk/Shapes/Polygon.cs

@@ -4,6 +4,9 @@ using MoonTools.Core.Structs;
 
 namespace MoonTools.Core.Bonk
 {
+    /// <summary>
+    /// A Shape defined by an arbitrary collection of vertices. WARNING: Polygon must use an Array internally and therefore will create GC pressure.
+    /// </summary>
     public struct Polygon : IShape2D, IEquatable<IShape2D>
     {
         public Position2D[] Vertices { get; private set; }

Bonk/Shapes/Rectangle.cs

@@ -7,6 +7,9 @@ using MoreLinq;
 
 namespace MoonTools.Core.Bonk
 {
+    /// <summary>
+    /// A rectangle is a shape defined by a minimum and maximum X value and a minimum and maximum Y value.
+    /// </summary>
     public struct Rectangle : IShape2D, IEquatable<IShape2D>
     {
         public int MinX { get; }

Bonk/Shapes/Simplex.cs

@@ -5,6 +5,9 @@ using MoonTools.Core.Bonk.Extensions;
 
 namespace MoonTools.Core.Bonk
 {
+    /// <summary>
+    /// A simplex is a shape used to calculate overlap. It is defined by a Minkowski difference and two direction vectors.
+    /// </summary>
     public struct Simplex : IShape2D
     {
         MinkowskiDifference minkowskiDifference;