git-svn-id: svn://svn.ijw.co.nz/svn/OpenRa@1317 993157c7-ee19-0410-b2c4-bb4e9862e678

OpenRa.DataStructures/float2.cs

@@ -0,0 +1,71 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Runtime.InteropServices;
+using System.Drawing;
+
+namespace OpenRa
+{
+	[StructLayout(LayoutKind.Sequential)]
+	public struct float2
+	{
+		public float X, Y;
+
+		public float2(float x, float y) { X = x; Y = y; }
+		public float2(PointF p) { X = p.X; Y = p.Y; }
+		public float2(Point p) { X = p.X; Y = p.Y; }
+		public float2(Size p) { X = p.Width; Y = p.Height; }
+		public float2(SizeF p) { X = p.Width; Y = p.Height; }
+
+		public PointF ToPointF() { return new PointF(X, Y); }
+
+		public static implicit operator float2(int2 src) { return new float2(src.X, src.Y); }
+
+		public static float2 operator +(float2 a, float2 b) { return new float2(a.X + b.X, a.Y + b.Y); }
+		public static float2 operator -(float2 a, float2 b) { return new float2(a.X - b.X, a.Y - b.Y); }
+
+		public static float2 operator -(float2 a) { return new float2(-a.X, -a.Y); }
+
+		static float Lerp(float a, float b, float t) { return (1 - t) * a + t * b; }
+
+		public static float2 Lerp(float2 a, float2 b, float t)
+		{
+			return new float2(
+				Lerp(a.X, b.X, t),
+				Lerp(a.Y, b.Y, t));
+		}
+
+		public static float2 Lerp(float2 a, float2 b, float2 t)
+		{
+			return new float2(
+				Lerp(a.X, b.X, t.X),
+				Lerp(a.Y, b.Y, t.Y));
+		}
+
+		public static float2 FromAngle(float a) { return new float2((float)Math.Sin(a), (float)Math.Cos(a)); }
+
+		static float Constrain(float x, float a, float b) { return x < a ? a : x > b ? b : x; }
+
+		public float2 Constrain(float2 min, float2 max)
+		{
+			return new float2(
+				Constrain(X, min.X, max.X),
+				Constrain(Y, min.Y, max.Y));
+		}
+
+		public static float2 operator *(float a, float2 b) { return new float2(a * b.X, a * b.Y); }
+		public static float2 operator /(float2 a, float2 b) { return new float2(a.X / b.X, a.Y / b.Y); }
+
+		public static readonly float2 Zero = new float2(0, 0);
+
+		public static bool WithinEpsilon(float2 a, float2 b, float e)
+		{
+			float2 d = a - b;
+			return Math.Abs(d.X) < e && Math.Abs(d.Y) < e;
+		}
+
+		public float2 Sign() { return new float2(Math.Sign(X), Math.Sign(Y)); }
+		public static float Dot(float2 a, float2 b) { return a.X * b.X + a.Y * b.Y; }
+		public float2 Round() { return new float2((float)Math.Round(X), (float)Math.Round(Y)); }
+	}
+}