camera movement finished

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

@@ -1,5 +1,7 @@
 package org.hl.engine.math.lalg;
 
+import java.util.Objects;
+
 public class Vector2f {
 	private float x;
 	private float y;
@@ -16,9 +18,63 @@ public class Vector2f {
 	}
 
 
-	public void add(float x, float y) {
-		this.x += x;
-		this.y += y;
+	public static Vector2f add(Vector2f first, Vector2f second) {
+		return new Vector2f(first.getX() + second.getX(), first.getY() + second.getY());
+	}
+
+	public static Vector2f sub(Vector2f first, Vector2f second) {
+		return new Vector2f(first.getX() - second.getX(), first.getY() - second.getY());
+	}
+
+	public static Vector2f mul(Vector2f first, Vector2f second) {
+		return new Vector2f(first.getX() * second.getX(), first.getY() * second.getY());
+	}
+
+	public static Vector2f div(Vector2f first, Vector2f second) {
+		return new Vector2f(first.getX() / second.getX(), first.getY() / second.getY());
+	}
+
+	public static float dot(Vector2f first, Vector2f second) {
+		return first.getX()*second.getX() + first.getY()*second.getY();
+	}
+
+	public static float magnitude(Vector2f vector) {
+		return (float)Math.sqrt(vector.getX()*vector.getX() + vector.getY()*vector.getY());
+	}
+
+	public static Vector2f normalize(Vector2f vector) {
+		float len = Vector2f.magnitude(vector);
+		return Vector2f.div(vector, new Vector2f(len, len));
+	}
+
+	public static Vector2f scale(Vector2f vector, float scalar) {
+		return new Vector2f(vector.getX()*scalar, vector.getY()*scalar);
+	}
+
+	public static Vector2f projection(Vector2f projecting, Vector2f projectedOnto) {
+		return Vector2f.scale(projectedOnto, ( Vector2f.dot(projecting, projectedOnto) / Vector2f.dot(projectedOnto, projectedOnto) ));
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		if (this == o) return true;
+		if (o == null || getClass() != o.getClass()) return false;
+		Vector2f vector2f = (Vector2f) o;
+		return Float.compare(vector2f.getX(), getX()) == 0 &&
+				Float.compare(vector2f.getY(), getY()) == 0;
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(getX(), getY());
+	}
+
+	@Override
+	public String toString() {
+		return "Vector2f{" +
+				"x=" + x +
+				", y=" + y +
+				'}';
 	}
 
 	public float getX() {