Published
Edited
Oct 6, 2020
Importers
md`# Vector2D`
class Vector2D extends Array {
constructor(x = 1, y = 0) {
super(x, y);
}
set x(v) {
this[0] = v;
}
set y(v) {
this[1] = v;
}
get x() {
return this[0];
}
get y() {
return this[1];
}
get length() {
return Math.hypot(this.x, this.y);
}
get dir() {
return Math.atan2(this.y, this.x);
}
copy() {
return new Vector2D(this.x, this.y);
}
add(v) {
this.x += v.x;
this.y += v.y;
return this;
}
sub(v) {
this.x -= v.x;
this.y -= v.y;
return this;
}
scale(a) {
this.x *= a;
this.y *= a;
return this;
}
cross(v) {
return this.x * v.y - v.x * this.y;
}
dot(v) {
return this.x * v.x + v.y * this.y;
}
normalize() {
return this.scale(1 / this.length);
}
rotate(rad) {
const c = Math.cos(rad),
s = Math.sin(rad);
const [x, y] = this;
this.x = x * c + y * -s;
this.y = x * s + y * c;
return this;
}
}
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