@creenv/vector v1.0.3

@creenv/vector

The Creative Environment vector implements a generic n-dimensional Vector class which can handle any number of components. @creenv/vector also implements 3 children of such a class, Vector2, Vector3 and Vector4.

How to use

import Vector from '@creenv/vector';

// 2 components vector
let vec2 = new Vector(10.5, 0.7);

// 5 components vector 
let vec5 = new Vector(10, 20, -4, 10.5, 78);

It is also possible to use children classes Vector2, Vector3 and Vector4 to have access to x, y, z, w components:

import Vector2 from '@creenv/vector/vector2';
import Vector4 from '@creenv/vector/vector4';

// 2 components vector
let vec2 = new Vector2(10.5, 0.7);

// we can now access the components like so 
let x = vec2.x;
let y = vec2.y;

// 4 components vector 
let vec4 = new Vector3(12, -3, 5, 7);

// we can now access the components like so 
let x = vec4.x;
let y = vec4.y;
let z = vec4.z;
let w = vec4.w;

Chaining operations

Most of the methods returns this, which means it is possible to chain operations:

let vec = new Vector(10,10,10);
vec.add(5,5,5).substract(3,3,3).multiplyScalar(2);

console.log(vec.components); // expected output: [24, 24, 24]

Full doc

Following is a full list of availaible methods via the Vector class.

constructor (...components)

The number of arguments sent to the constructor will determine the dimesions of the vector. 4 arguments will result in a 4-dimentional vector.

static Vector.fromVector (vector: Vector)

Because we want the vector class to be as fast as possible, its constructor needs to perform as less actions as possible. In order to achieve such an effect, a "copy constructor" cannot be used because it would require some more tests and computations within the constructor. Therefore such a copy is possible through this static method

@Return a new vector, which has the same components as vector.

getter .length

Returns the length of the vector, computed as Math.sqrt(xx + yy + z*z +...)

// example 
let vec = new Vector2(10,20);

console.log(vec.length); // expected output 22,36067977...

vec.x = 2;
vec.y = 4;

console.log(vec.length); // expected output 4,472135954...

.set(x,y,z,...)

Updates the value of the vector's components. Same behavious than constructor. If one of the components is set to null or undefined, it won't be updated.

// example 
let vec = new Vector(12,11,5);

// updating all the components 
vec.set(-2,4,7);
console.log(vec.components); // expected: [-2, 4, 7]

// updating only Y 
vec.set(null,18);
console.log(vec.components); // expected [-2, 18, 7]

.copy()

Returns a copy a this vector. Required if modifying the Vector has to be avoided.

.apply(func: Function)

Applies a function func to all the components of this vector.

// example 
let vec = new Vector(10,50);
vec.apply(x => x/10);
console.log(vec.components); // expected ouput [1; 5]

@Return Vector: this vector, can be used to chain operations

.add(...components: ...number)

Adds the components in parameter to the components of the vector

// example 
let vec = new Vector(12,11,10);
vec.add(4,0,2);

console.log(vec.components); // expected output [16, 11, 12]

@Return Vector: this vector, can be used to chain operations

.addVector(vector: Vector)

Adds the @param vector to this vector.

// example 
let vec = new Vector(12,11,10),
    vec2 = new Vector2(4,0,2);
vec.addVector(vec2);

console.log(vec.components); // expected output [16, 11, 12]

@Return Vector: this vector, can be used to chain operations

.addScalar(scalar: number)

Adds the @param scalar number to all the components of this vector.

// example 
let vec = new Vector(10,11,12);
vec.addScalar(5);

console.log(vec.components); // expected output: [15, 16, 17]

@Return Vector: this vector, can be used to chain operations

.substract(...components: ...number)

Substracts the components in parameter to the components of the vector

// example 
let vec = new Vector(12,11,10);
vec.substract(4,0,2);

console.log(vec.components); // expected output [8, 11, 8]

@Return Vector: this vector, can be used to chain operations

.substractVector(vector: Vector)

Substract the @param vector to this vector.

// example 
let vec = new Vector(12,11,10),
    vec2 = new Vector2(4,0,2);
vec.substractVector(vec2);

console.log(vec.components); // expected output [8, 11, 8]

@Return Vector: this vector, can be used to chain operations

.substractScalar(scalar: number)

Substracts the @param scalar number to all the components of this vector.

// example 
let vec = new Vector(10,11,12);
vec.substractScalar(5);

console.log(vec.components); // expected output: [5, 6, 7]

@Return Vector: this vector, can be used to chain operations

.multiply(...components: ...number)

Multiplies the components in parameter to the components of the vector

// example 
let vec = new Vector(12,11,10);
vec.multiply(4,0,2);

console.log(vec.components); // expected output [48, 0, 20]

@Return Vector: this vector, can be used to chain operations

.multiplyVector(vector: Vector)

Multiplies the components of @param vector with the components of this vector, 1 to 1.

// example 
let vec = new Vector(12,11,10),
    vec2 = new Vector2(4,0,2);
vec.multiplyVector(vec2);

console.log(vec.components); // expected output [48, 0, 20]

@Return Vector: this vector, can be used to chain operations

.multiplyScalar(scalar: number)

Mutiplies the components of this vector with the @param scalar number.

// example 
let vec = new Vector(10,11,12);
vec.multiplyScalar(5);

console.log(vec.components); // expected output: [50, 55, 60]

@Return Vector: this vector, can be used to chain operations

.divide(...components: ...number)

Divides the components of this vector by the components in argument

// example 
let vec = new Vector(12,11,10);
vec.divide(4,1,2);

console.log(vec.components); // expected output [3, 11, 2]

@Return Vector: this vector, can be used to chain operations

.divideVector(vector: Vector)

Divides the components of this vector by the corresponding components of @param vector

// example 
let vec = new Vector(12,11,10),
    vec2 = new Vector2(4,1,2);
vec.divideVector(vec2);

console.log(vec.components); // expected output [3, 11, 2]

@Return Vector: this vector, can be used to chain operations

.divideScalar(scalar: number)

Divides the components of this vector by the @param scalar number.

// example 
let vec = new Vector(10,11,12);
vec.divideScalar(2);

console.log(vec.components); // expected output: [5, 5.5, 6]

@Return Vector: this vector, can be used to chain operations

.dot(vector: Vector)

Returns the dot product between this vector and the @param vector.

// example 
let u = new Vector(12,5,8),
    v = new Vector(-1,0,4),
    dotProd = u.dot(v); // expected value: 20

@Return number

.cross(vector: Vector)

Returns the cross product between this vector and the @param vector.

// example 
let u = new Vector(4,3,-2),
    v = new Vector(12,7,0);

let w = u.cross(v);
  
console.log(w.components); // expected value: [14; -24; -8]

@Return Vector: a new Vector, cross product of this and vector

.normalize()

Normalize the components of the vector so its length is equal to 1

// example 
let vec3 = new Vector3(10,20,30);
console.log(vec3.length); // expected ouput: [10, 20, 30] 37.416573867739416

vec3.normalize();
console.log(vec3.components, vec3.length); // [0.2672612419124244, 0.5345224838248488, 0.8017837257372731] 0.9999999999999999

.equals(vector: Vector)

Tests if this vector and @param vector have the same number of dimensions and equal components.

// example
let vec = new Vector(10,20,30),
    vec2 = new Vector(10,11);
console.log(vec.equals(vec2)); // expected output: false

let vec_ = new Vector(10,20,30),
    vec2_ = new Vector(10,20,31);
console.log(vec_.equals(vec2_)); // expected output: false

let vec__ = new Vector(10,20,30),
    vec2__ = new Vector(10,20,30);
console.log(vec__.equals(vec2__)); // expected ouput: true