Vector2 class

Vector2

import 'dart:math';

/**
 * Immutable Vector2 class
 * @author Drahomír Hanák
 */
class Vector2
{

	num _x;
	num _y;

	num get x => this._x;
	num get y => this._y;

    Vector2(num x, num y)
	{
		this._x = x;
		this._y = y;
    }

	// Vector manipulation methods
	Vector2 negate() => new Vector2(-this.x, -this.y);
	Vector2 add(Vector2 vec) => new Vector2(this.x + vec.x, this.y + vec.y);
	Vector2 sub(Vector2 vec) => new Vector2(this.x - vec.x, this.y - vec.y);
	Vector2 mul(Vector2 vec) => new Vector2(this.x * vec.x, this.y * vec.y);
	Vector2 div(Vector2 vec) => new Vector2(this.x / vec.x, this.y / vec.y);
	Vector2 square() => new Vector2(this.x * this.x, this.y * this.y);
	Vector2 abs() => new Vector2(this.x.abs(), this.y.abs());
	num dot(Vector2 vec) => (this.x * vec.x) + (this.y * vec.y);
	num length() => (this.x * this.x) + (this.y * vec.y);
	num mod() => sqrt(this.length());
	bool equals(Vector2 vec) => (this.x == vec.x) && (this.y == vec.y);
	String toString() => '(' + this.x + ', ' + this.y + ')';

	// Operators overloading
	operator == (Vector2 vec) => this.equals(this, vec);
	operator + (Vector2 vec) => this.add(this, vec);
	operator - (Vector2 vec) => this.sub(this, vec);
	operator * (Vector2 vec) => this.mul(this, vec);
	operator / (Vector2 vec) => this.div(this, vec);
}