vector/index.js at master · component/vector · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174

/**
 * Expose `Vector`.
 */

module.exports = Vector;

/**
 * Initialize a new `Vector` with x / y.
 *
 * @param {Number} x
 * @param {Number} y
 * @api public
 */

function Vector(x, y) {
  if (!(this instanceof Vector)) return new Vector(x, y);
  this.x = x;
  this.y = y;
}

/**
 * Return a negated vector.
 *
 * @return {Vector}
 * @api public
 */

Vector.prototype.negate = function(){
  return new Vector(-this.x, -this.y);
};

/**
 * Add x / y.
 *
 * @param {Vector} p
 * @return {Vector} new vector
 * @api public
 */

Vector.prototype.add = function(v){
  return new Vector(this.x + v.x, this.y + v.y);
};

/**
 * Sub x / y.
 *
 * @param {Vector} p
 * @return {Vector} new vector
 * @api public
 */

Vector.prototype.sub = function(v){
  return new Vector(this.x - v.x, this.y - v.y);
};

/**
 * Multiply x / y.
 *
 * @param {Vector} p
 * @return {Vector} new vector
 * @api public
 */

Vector.prototype.mul = function(v){
  return new Vector(this.x * v.x, this.y * v.y);
};

/**
 * Divide x / y.
 *
 * @param {Vector} p
 * @return {Vector} new vector
 * @api public
 */

Vector.prototype.div = function(v){
  return new Vector(this.x / v.x, this.y / v.y);
};

/**
 * Check if these vectors are the same.
 *
 * @param {Vector} p
 * @return {Boolean}
 * @api public
 */

Vector.prototype.equals = function(v){
  return this.x == v.x && this.y == v.y;
};

/**
 * Return a clone of this vector.
 *
 * @return {Vector} new vector
 * @api public
 */

Vector.prototype.clone = function(){
  return new Vector(this.x, this.y);
};

/**
 * Return angle in radians.
 *
 * @return {Number}
 * @api public
 */

Vector.prototype.angle = function(){
  return Math.atan2(this.x, this.y);
};

/**
 * Return angle in degrees.
 *
 * @return {Number}
 * @api public
 */

Vector.prototype.degrees = function(){
  return this.angle() * 180 / Math.PI;
};

/**
 * Return the distance between vectors.
 *
 * @param {Vector} v
 * @return {Number}
 * @api public
 */

Vector.prototype.distance = function(v){
  var x = this.x - v.x;
  var y = this.y - v.y;
  return Math.sqrt(x * x + y * y);
};

/**
 * Return the linear interpolation between vectors given a step point.
 *
 * @param {Vector} v
 * @param {Number} a
 * @return {Vector}
 * @api public
 */

Vector.prototype.interpolated = function(v, a){
  return new Vector(this.x * (1 - a) + v.x * a, this.y * (1 - a) + v.y * a);
};

/**
 * Return the middle position between vectors.
 *
 * @param {Vector} v
 * @return {Vector}
 * @api public
 */

Vector.prototype.middle = function(v){
  return this.interpolated(v, .5);
};

/**
 * Return "(x, y)" string representation.
 *
 * @return {String}
 * @api public
 */

Vector.prototype.toString = function(){
  return '(' + this.x + ', ' + this.y + ')';
};