53 lines
1.5 KiB
C#
53 lines
1.5 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using FarseerPhysics.Dynamics.Contacts;
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using Microsoft.Xna.Framework;
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namespace Axios.Engine.Extensions
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{
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public enum CollisionDirection
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{
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Right,
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Left,
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Top,
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Bottom
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}
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public static class AxiosExtensions_Contact
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{
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/// http://farseerphysics.codeplex.com/discussions/281783
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/// <summary>
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/// Returns the direction that the collision happened.
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/// Should be used in the event OnAfterCollision
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/// </summary>
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/// <param name="c"></param>
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/// <returns></returns>
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public static CollisionDirection Direction(this Contact c)
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{
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CollisionDirection direction;
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// Work out collision direction
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Vector2 colNorm = c.Manifold.LocalNormal;
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if (Math.Abs(colNorm.X) > Math.Abs(colNorm.Y))
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{
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// X direction is dominant
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if (colNorm.X > 0)
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direction = CollisionDirection.Right;
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else
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direction = CollisionDirection.Left;
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}
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else
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{
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// Y direction is dominant
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if (colNorm.Y > 0)
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direction = CollisionDirection.Bottom;
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else
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direction = CollisionDirection.Top;
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}
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return direction;
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}
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}
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}
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