"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Point = void 0;
const util_1 = require("./util");
const angle_1 = require("./angle");
const geometry_1 = require("./geometry");
class Point extends geometry_1.Geometry {
    constructor(x, y) {
        super();
        this.x = x == null ? 0 : x;
        this.y = y == null ? 0 : y;
    }
    /**
     * Rounds the point to the given precision.
     */
    round(precision = 0) {
        this.x = util_1.GeometryUtil.round(this.x, precision);
        this.y = util_1.GeometryUtil.round(this.y, precision);
        return this;
    }
    add(x, y) {
        const p = Point.create(x, y);
        this.x += p.x;
        this.y += p.y;
        return this;
    }
    update(x, y) {
        const p = Point.create(x, y);
        this.x = p.x;
        this.y = p.y;
        return this;
    }
    translate(dx, dy) {
        const t = Point.create(dx, dy);
        this.x += t.x;
        this.y += t.y;
        return this;
    }
    /**
     * Rotate the point by `degree` around `center`.
     */
    rotate(degree, center) {
        const p = Point.rotate(this, degree, center);
        this.x = p.x;
        this.y = p.y;
        return this;
    }
    /**
     * Scale point by `sx` and `sy` around the given `origin`. If origin is
     * not specified, the point is scaled around `0, 0`.
     */
    scale(sx, sy, origin = new Point()) {
        const ref = Point.create(origin);
        this.x = ref.x + sx * (this.x - ref.x);
        this.y = ref.y + sy * (this.y - ref.y);
        return this;
    }
    /**
     * Chooses the point closest to this point from among `points`. If `points`
     * is an empty array, `null` is returned.
     */
    closest(points) {
        if (points.length === 1) {
            return Point.create(points[0]);
        }
        let ret = null;
        let min = Infinity;
        points.forEach((p) => {
            const dist = this.squaredDistance(p);
            if (dist < min) {
                ret = p;
                min = dist;
            }
        });
        return ret ? Point.create(ret) : null;
    }
    /**
     * Returns the distance between the point and another point `p`.
     */
    distance(p) {
        return Math.sqrt(this.squaredDistance(p));
    }
    /**
     * Returns the squared distance between the point and another point `p`.
     *
     * Useful for distance comparisons in which real distance is not necessary
     * (saves one `Math.sqrt()` operation).
     */
    squaredDistance(p) {
        const ref = Point.create(p);
        const dx = this.x - ref.x;
        const dy = this.y - ref.y;
        return dx * dx + dy * dy;
    }
    manhattanDistance(p) {
        const ref = Point.create(p);
        return Math.abs(ref.x - this.x) + Math.abs(ref.y - this.y);
    }
    /**
     * Returns the magnitude of the point vector.
     *
     * @see http://en.wikipedia.org/wiki/Magnitude_(mathematics)
     */
    magnitude() {
        return Math.sqrt(this.x * this.x + this.y * this.y) || 0.01;
    }
    /**
     * Returns the angle(in degrees) between vector from this point to `p` and
     * the x-axis.
     */
    theta(p = new Point()) {
        const ref = Point.create(p);
        const y = -(ref.y - this.y); // invert the y-axis.
        const x = ref.x - this.x;
        let rad = Math.atan2(y, x);
        // Correction for III. and IV. quadrant.
        if (rad < 0) {
            rad = 2 * Math.PI + rad;
        }
        return (180 * rad) / Math.PI;
    }
    /**
     * Returns the angle(in degrees) between vector from this point to `p1` and
     * the vector from this point to `p2`.
     *
     * The ordering of points `p1` and `p2` is important.
     *
     * The function returns a value between `0` and `180` when the angle (in the
     * direction from `p1` to `p2`) is clockwise, and a value between `180` and
     * `360` when the angle is counterclockwise.
     *
     * Returns `NaN` if either of the points `p1` and `p2` is equal with this point.
     */
    angleBetween(p1, p2) {
        if (this.equals(p1) || this.equals(p2)) {
            return NaN;
        }
        let angle = this.theta(p2) - this.theta(p1);
        if (angle < 0) {
            angle += 360;
        }
        return angle;
    }
    /**
     * Returns the angle(in degrees) between the line from `(0,0)` and this point
     * and the line from `(0,0)` to `p`.
     *
     * The function returns a value between `0` and `180` when the angle (in the
     * direction from this point to `p`) is clockwise, and a value between `180`
     * and `360` when the angle is counterclockwise. Returns `NaN` if called from
     * point `(0,0)` or if `p` is `(0,0)`.
     */
    vectorAngle(p) {
        const zero = new Point(0, 0);
        return zero.angleBetween(this, p);
    }
    /**
     * Converts rectangular to polar coordinates.
     */
    toPolar(origin) {
        this.update(Point.toPolar(this, origin));
        return this;
    }
    /**
     * Returns the change in angle(in degrees) that is the result of moving the
     * point from its previous position to its current position.
     *
     * More specifically, this function computes the angle between the line from
     * the ref point to the previous position of this point(i.e. current position
     * `-dx`, `-dy`) and the line from the `ref` point to the current position of
     * this point.
     *
     * The function returns a positive value between `0` and `180` when the angle
     * (in the direction from previous position of this point to its current
     * position) is clockwise, and a negative value between `0` and `-180` when
     * the angle is counterclockwise.
     *
     * The function returns `0` if the previous and current positions of this
     * point are the same (i.e. both `dx` and `dy` are `0`).
     */
    changeInAngle(dx, dy, ref = new Point()) {
        // Revert the translation and measure the change in angle around x-axis.
        return this.clone().translate(-dx, -dy).theta(ref) - this.theta(ref);
    }
    /**
     * If the point lies outside the rectangle `rect`, adjust the point so that
     * it becomes the nearest point on the boundary of `rect`.
     */
    adhereToRect(rect) {
        if (!util_1.GeometryUtil.containsPoint(rect, this)) {
            this.x = Math.min(Math.max(this.x, rect.x), rect.x + rect.width);
            this.y = Math.min(Math.max(this.y, rect.y), rect.y + rect.height);
        }
        return this;
    }
    /**
     * Returns the bearing(cardinal direction) between me and the given point.
     *
     * @see https://en.wikipedia.org/wiki/Cardinal_direction
     */
    bearing(p) {
        const ref = Point.create(p);
        const lat1 = angle_1.Angle.toRad(this.y);
        const lat2 = angle_1.Angle.toRad(ref.y);
        const lon1 = this.x;
        const lon2 = ref.x;
        const dLon = angle_1.Angle.toRad(lon2 - lon1);
        const y = Math.sin(dLon) * Math.cos(lat2);
        const x = Math.cos(lat1) * Math.sin(lat2) -
            Math.sin(lat1) * Math.cos(lat2) * Math.cos(dLon);
        const brng = angle_1.Angle.toDeg(Math.atan2(y, x));
        const bearings = ['NE', 'E', 'SE', 'S', 'SW', 'W', 'NW', 'N'];
        let index = brng - 22.5;
        if (index < 0) {
            index += 360;
        }
        index = parseInt((index / 45), 10);
        return bearings[index];
    }
    /**
     * Returns the cross product of the vector from me to `p1` and the vector
     * from me to `p2`.
     *
     * The left-hand rule is used because the coordinate system is left-handed.
     */
    cross(p1, p2) {
        if (p1 != null && p2 != null) {
            const a = Point.create(p1);
            const b = Point.create(p2);
            return (b.x - this.x) * (a.y - this.y) - (b.y - this.y) * (a.x - this.x);
        }
        return NaN;
    }
    /**
     * Returns the dot product of this point with given other point.
     */
    dot(p) {
        const ref = Point.create(p);
        return this.x * ref.x + this.y * ref.y;
    }
    diff(dx, dy) {
        if (typeof dx === 'number') {
            return new Point(this.x - dx, this.y - dy);
        }
        const p = Point.create(dx);
        return new Point(this.x - p.x, this.y - p.y);
    }
    /**
     * Returns an interpolation between me and point `p` for a parametert in
     * the closed interval `[0, 1]`.
     */
    lerp(p, t) {
        const ref = Point.create(p);
        return new Point((1 - t) * this.x + t * ref.x, (1 - t) * this.y + t * ref.y);
    }
    /**
     * Normalize the point vector, scale the line segment between `(0, 0)`
     * and the point in order for it to have the given length. If length is
     * not specified, it is considered to be `1`; in that case, a unit vector
     * is computed.
     */
    normalize(length = 1) {
        const scale = length / this.magnitude();
        return this.scale(scale, scale);
    }
    /**
     * Moves this point along the line starting from `ref` to this point by a
     * certain `distance`.
     */
    move(ref, distance) {
        const p = Point.create(ref);
        const rad = angle_1.Angle.toRad(p.theta(this));
        return this.translate(Math.cos(rad) * distance, -Math.sin(rad) * distance);
    }
    /**
     * Returns a point that is the reflection of me with the center of inversion
     * in `ref` point.
     */
    reflection(ref) {
        return Point.create(ref).move(this, this.distance(ref));
    }
    snapToGrid(gx, gy) {
        this.x = util_1.GeometryUtil.snapToGrid(this.x, gx);
        this.y = util_1.GeometryUtil.snapToGrid(this.y, gy == null ? gx : gy);
        return this;
    }
    equals(p) {
        const ref = Point.create(p);
        return ref != null && ref.x === this.x && ref.y === this.y;
    }
    clone() {
        return Point.clone(this);
    }
    /**
     * Returns the point as a simple JSON object. For example: `{ x: 0, y: 0 }`.
     */
    toJSON() {
        return Point.toJSON(this);
    }
    serialize() {
        return `${this.x} ${this.y}`;
    }
}
exports.Point = Point;
(function (Point) {
    function isPoint(instance) {
        return instance != null && instance instanceof Point;
    }
    Point.isPoint = isPoint;
})(Point = exports.Point || (exports.Point = {}));
(function (Point) {
    function isPointLike(p) {
        return (p != null &&
            typeof p === 'object' &&
            typeof p.x === 'number' &&
            typeof p.y === 'number');
    }
    Point.isPointLike = isPointLike;
    function isPointData(p) {
        return (p != null &&
            Array.isArray(p) &&
            p.length === 2 &&
            typeof p[0] === 'number' &&
            typeof p[1] === 'number');
    }
    Point.isPointData = isPointData;
})(Point = exports.Point || (exports.Point = {}));
(function (Point) {
    function create(x, y) {
        if (x == null || typeof x === 'number') {
            return new Point(x, y);
        }
        return clone(x);
    }
    Point.create = create;
    function clone(p) {
        if (Point.isPoint(p)) {
            return new Point(p.x, p.y);
        }
        if (Array.isArray(p)) {
            return new Point(p[0], p[1]);
        }
        return new Point(p.x, p.y);
    }
    Point.clone = clone;
    function toJSON(p) {
        if (Point.isPoint(p)) {
            return { x: p.x, y: p.y };
        }
        if (Array.isArray(p)) {
            return { x: p[0], y: p[1] };
        }
        return { x: p.x, y: p.y };
    }
    Point.toJSON = toJSON;
    /**
     * Returns a new Point object from the given polar coordinates.
     * @see http://en.wikipedia.org/wiki/Polar_coordinate_system
     */
    function fromPolar(r, rad, origin = new Point()) {
        let x = Math.abs(r * Math.cos(rad));
        let y = Math.abs(r * Math.sin(rad));
        const org = clone(origin);
        const deg = angle_1.Angle.normalize(angle_1.Angle.toDeg(rad));
        if (deg < 90) {
            y = -y;
        }
        else if (deg < 180) {
            x = -x;
            y = -y;
        }
        else if (deg < 270) {
            x = -x;
        }
        return new Point(org.x + x, org.y + y);
    }
    Point.fromPolar = fromPolar;
    /**
     * Converts rectangular to polar coordinates.
     */
    function toPolar(point, origin = new Point()) {
        const p = clone(point);
        const o = clone(origin);
        const dx = p.x - o.x;
        const dy = p.y - o.y;
        return new Point(Math.sqrt(dx * dx + dy * dy), // r
        angle_1.Angle.toRad(o.theta(p)));
    }
    Point.toPolar = toPolar;
    function equals(p1, p2) {
        if (p1 === p2) {
            return true;
        }
        if (p1 != null && p2 != null) {
            return p1.x === p2.x && p1.y === p2.y;
        }
        return false;
    }
    Point.equals = equals;
    function equalPoints(p1, p2) {
        if ((p1 == null && p2 != null) ||
            (p1 != null && p2 == null) ||
            (p1 != null && p2 != null && p1.length !== p2.length)) {
            return false;
        }
        if (p1 != null && p2 != null) {
            for (let i = 0, ii = p1.length; i < ii; i += 1) {
                if (!equals(p1[i], p2[i])) {
                    return false;
                }
            }
        }
        return true;
    }
    Point.equalPoints = equalPoints;
    /**
     * Returns a point with random coordinates that fall within the range
     * `[x1, x2]` and `[y1, y2]`.
     */
    function random(x1, x2, y1, y2) {
        return new Point(util_1.GeometryUtil.random(x1, x2), util_1.GeometryUtil.random(y1, y2));
    }
    Point.random = random;
    function rotate(point, angle, center) {
        const rad = angle_1.Angle.toRad(angle_1.Angle.normalize(-angle));
        const sin = Math.sin(rad);
        const cos = Math.cos(rad);
        return rotateEx(point, cos, sin, center);
    }
    Point.rotate = rotate;
    function rotateEx(point, cos, sin, center = new Point()) {
        const source = clone(point);
        const origin = clone(center);
        const dx = source.x - origin.x;
        const dy = source.y - origin.y;
        const x1 = dx * cos - dy * sin;
        const y1 = dy * cos + dx * sin;
        return new Point(x1 + origin.x, y1 + origin.y);
    }
    Point.rotateEx = rotateEx;
})(Point = exports.Point || (exports.Point = {}));
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