@galihrivanto/google-vector-tiles/lib/vectortiles/Point.js

A vector map tiler for google map

function Point (x, y) {
    this.x = x;
    this.y = y;
}

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

    add: function (p) { return this.clone()._add(p); },
    sub: function (p) { return this.clone()._sub(p); },
    mult: function (k) { return this.clone()._mult(k); },
    div: function (k) { return this.clone()._div(k); },
    rotate: function (a) { return this.clone()._rotate(a); },
    matMult: function (m) { return this.clone()._matMult(m); },
    unit: function () { return this.clone()._unit(); },
    perp: function () { return this.clone()._perp(); },
    round: function () { return this.clone()._round(); },

    mag: function () {
        return Math.sqrt(this.x * this.x + this.y * this.y);
    },

    equals: function (p) {
        return this.x === p.x &&
            this.y === p.y;
    },

    dist: function (p) {
        return Math.sqrt(this.distSqr(p));
    },

    distSqr: function (p) {
        var dx = p.x - this.x,
            dy = p.y - this.y;
        return dx * dx + dy * dy;
    },

    angle: function () {
        return Math.atan2(this.y, this.x);
    },

    angleTo: function (b) {
        return Math.atan2(this.y - b.y, this.x - b.x);
    },

    angleWith: function (b) {
        return this.angleWithSep(b.x, b.y);
    },

    // Find the angle of the two vectors, solving the formula for the cross product a x b = |a||b|sin(θ) for θ.
    angleWithSep: function (x, y) {
        return Math.atan2(
            this.x * y - this.y * x,
            this.x * x + this.y * y);
    },

    _matMult: function (m) {
        var x = m[0] * this.x + m[1] * this.y,
            y = m[2] * this.x + m[3] * this.y;
        this.x = x;
        this.y = y;
        return this;
    },

    _add: function (p) {
        this.x += p.x;
        this.y += p.y;
        return this;
    },

    _sub: function (p) {
        this.x -= p.x;
        this.y -= p.y;
        return this;
    },

    _mult: function (k) {
        this.x *= k;
        this.y *= k;
        return this;
    },

    _div: function (k) {
        this.x /= k;
        this.y /= k;
        return this;
    },

    _unit: function () {
        this._div(this.mag());
        return this;
    },

    _perp: function () {
        var y = this.y;
        this.y = this.x;
        this.x = -y;
        return this;
    },

    _rotate: function (angle) {
        var cos = Math.cos(angle),
            sin = Math.sin(angle),
            x = cos * this.x - sin * this.y,
            y = sin * this.x + cos * this.y;
        this.x = x;
        this.y = y;
        return this;
    },

    _round: function () {
        this.x = Math.round(this.x);
        this.y = Math.round(this.y);
        return this;
    }
};

// constructs Point from an array if necessary
Point.convert = function (a) {
    if (a instanceof Point) {
        return a;
    }
    if (Array.isArray(a)) {
        return new Point(a[0], a[1]);
    }
    return a;
};

export { Point }