From 52443bfa68361c4263d7441d5bb531b130c57ce4 Mon Sep 17 00:00:00 2001
From: Ellpeck <megamaximal@gmail.com>
Date: Mon, 10 Aug 2020 02:16:35 +0200
Subject: [PATCH] added some more utility functions for directions and vectors

---
 MLEM/Extensions/NumberExtensions.cs | 16 ++++++++++++++++
 MLEM/Misc/Direction2.cs             | 15 +++++++++++++++
 Sandbox/GameImpl.cs                 |  7 +++++++
 3 files changed, 38 insertions(+)

diff --git a/MLEM/Extensions/NumberExtensions.cs b/MLEM/Extensions/NumberExtensions.cs
index d25365f..3fd4db6 100644
--- a/MLEM/Extensions/NumberExtensions.cs
+++ b/MLEM/Extensions/NumberExtensions.cs
@@ -59,6 +59,21 @@ namespace MLEM.Extensions {
             return new Vector4(vec.X.Floor(), vec.Y.Floor(), vec.Z.Floor(), vec.W.Floor());
         }
 
+        /// <inheritdoc cref="Math.Ceiling(decimal)"/>
+        public static Vector2 CeilCopy(this Vector2 vec) {
+            return new Vector2(vec.X.Ceil(), vec.Y.Ceil());
+        }
+
+        /// <inheritdoc cref="Math.Ceiling(decimal)"/>
+        public static Vector3 CeilCopy(this Vector3 vec) {
+            return new Vector3(vec.X.Ceil(), vec.Y.Ceil(), vec.Z.Ceil());
+        }
+
+        /// <inheritdoc cref="Math.Ceiling(decimal)"/>
+        public static Vector4 CeilCopy(this Vector4 vec) {
+            return new Vector4(vec.X.Ceil(), vec.Y.Ceil(), vec.Z.Ceil(), vec.W.Ceil());
+        }
+
         /// <summary>
         /// Multiplies a point by a given scalar.
         /// </summary>
@@ -184,5 +199,6 @@ namespace MLEM.Extensions {
                 matrix.M31 / scZ, matrix.M32 / scZ, matrix.M33 / scZ, 0,
                 0, 0, 0, 1));
         }
+
     }
 }
\ No newline at end of file
diff --git a/MLEM/Misc/Direction2.cs b/MLEM/Misc/Direction2.cs
index b685fc8..790b575 100644
--- a/MLEM/Misc/Direction2.cs
+++ b/MLEM/Misc/Direction2.cs
@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using Microsoft.Xna.Framework;
+using MLEM.Extensions;
 
 namespace MLEM.Misc {
     /// <summary>
@@ -229,5 +230,19 @@ namespace MLEM.Misc {
             }
         }
 
+        /// <summary>
+        /// Returns the <see cref="Direction2"/> that is closest to the given position's facing direction.
+        /// </summary>
+        /// <param name="offset">The vector whose corresponding direction to get</param>
+        /// <returns>The vector's direction</returns>
+        public static Direction2 ToDirection(this Vector2 offset) {
+            var offsetAngle = (float) Math.Atan2(offset.Y, offset.X);
+            foreach (var dir in AllExceptNone) {
+                if (Math.Abs(dir.Angle() - offsetAngle) <= MathHelper.PiOver4 / 2)
+                    return dir;
+            }
+            return Direction2.None;
+        }
+
     }
 }
\ No newline at end of file
diff --git a/Sandbox/GameImpl.cs b/Sandbox/GameImpl.cs
index 6c0ee56..d130701 100644
--- a/Sandbox/GameImpl.cs
+++ b/Sandbox/GameImpl.cs
@@ -100,6 +100,13 @@ namespace Sandbox {
             };
             Console.WriteLine(obj);
 
+            for (var i = 0; i < 360; i += 45) {
+                var rad = MathHelper.ToRadians(i);
+                var vec = new Vector2((float) Math.Sin(rad), (float) Math.Cos(rad));
+                var dir = vec.ToDirection();
+                Console.WriteLine(vec + " -> " + dir);
+            }
+
             var copy = obj.DeepCopy();
             Console.WriteLine(copy);