projection matrix

src/org/hl/engine/math/lalg/Vector2f.java

@@ -15,6 +15,12 @@ public class Vector2f {
 		this.y = y;
 	}
 
+
+	public void add(float x, float y) {
+		this.x += x;
+		this.y += y;
+	}
+
 	public float getX() {
 		return x;
 	}