added tweening functions for int, double, vec2i, vec2f

com/danitheskunk/skunkworks/Util.java

@@ -11,4 +11,12 @@ public class Util {
 		}
 		return new String(chars, 0, len);
 	}
+
+	public static double tweenDouble(double a, double b, double amount) {
+		return (b - a) * amount + a;
+	}
+
+	public static int tweenInt(int a, int b, double amount) {
+		return (int) ((b - a) * amount + a);
+	}
 }

com/danitheskunk/skunkworks/Vec2f.java

@@ -27,6 +27,13 @@ public final class Vec2f {
 		return new Vec2f(a.x / b, a.y / b);
 	}
 
+	public static Vec2f tween(Vec2f a, Vec2f b, double amount) {
+		return new Vec2f(
+			Util.tweenDouble(a.x, b.x, amount),
+			Util.tweenDouble(a.y, b.y, amount)
+		);
+	}
+
 	//getters and setters
 	public double getX() {
 		return x;

com/danitheskunk/skunkworks/Vec2i.java

@@ -40,6 +40,7 @@ public final class Vec2i {
 		return new Vec2i(a.x * b.x, a.y * b.y);
 	}
 
+
 	public static Vec2i div(Vec2i a, int b) {
 		return new Vec2i(a.x / b, a.y / b);
 	}
@@ -64,6 +65,13 @@ public final class Vec2i {
 		return new Vec2f(a.x / (double) b.x, a.y / (double) b.y);
 	}
 
+	public static Vec2i tween(Vec2i a, Vec2i b, double amount) {
+		return new Vec2i(Util.tweenInt(a.x, b.x, amount),
+			Util.tweenInt(a.y, b.y, amount)
+		);
+	}
+
+
 	public int getX() {
 		return x;
 	}