// Copyright(C) 2019 Lars Pontoppidan. All rights reserved.
// Use of this source code is governed by an MIT license file distributed with this software package

module vec2

pub struct Vec2 {
pub mut:
    x f64
    y f64
}

pub fn (mut v Vec2) zero() {
    v.x = 0.0
    v.y = 0.0
}

pub fn (mut v Vec2) from(src Vec2) {
    v.x = src.x
    v.y = src.y
}

/*
 * Addition
 */

// + operator overload. Adds two vectors
pub fn (v1 Vec2) + (v2 Vec2) Vec2 {
    return Vec2{v1.x + v2.x, v1.y + v2.y}
}

pub fn (v Vec2) add(vector Vec2) Vec2 {
    return Vec2{ v.x + vector.x, v.y + vector.y }
}

pub fn (v Vec2) add_f64(scalar f64) Vec2 {
    return Vec2{ v.x + scalar, v.y + scalar }
}

pub fn (mut v Vec2) plus(vector Vec2) {
    v.x += vector.x
    v.y += vector.y
}

pub fn (mut v Vec2) plus_f64(scalar f64) {
    v.x += scalar
    v.y += scalar
}


/*
 * Subtraction
 */
pub fn (v1 Vec2) - (v2 Vec2) Vec2 {
    return Vec2{v1.x - v2.x, v1.y - v2.y}
}

pub fn (v Vec2) sub(vector Vec2) Vec2 {
    return Vec2{ v.x - vector.x, v.y - vector.y }
}

pub fn (v Vec2) sub_f64(scalar f64) Vec2 {
    return Vec2{ v.x - scalar, v.y - scalar }
}

pub fn (mut v Vec2) subtract(vector Vec2) {
    v.x -= vector.x
    v.y -= vector.y
}

pub fn (mut v Vec2) subtract_f64(scalar f64) {
    v.x -= scalar
    v.y -= scalar
}

/*
 * Multiplication
 */
pub fn (v1 Vec2) * (v2 Vec2) Vec2 {
    return Vec2{v1.x * v2.x, v1.y * v2.y}
}


pub fn (v Vec2) mul(vector Vec2) Vec2 {
    return Vec2{ v.x * vector.x, v.y * vector.y }
}

pub fn (v Vec2) mul_f64(scalar f64) Vec2 {
    return Vec2{ v.x * scalar, v.y * scalar }
}

pub fn (mut v Vec2) multiply(vector Vec2) {
    v.x *= vector.x
    v.y *= vector.y
}

pub fn (mut v Vec2) multiply_f64(scalar f64) {
    v.x *= scalar
    v.y *= scalar
}