arcade-physics/lib/geom/circle/GetPoints.js

Use Arcade Physics without Phaser.

"use strict";
/**
 * @author       Richard Davey <rich@photonstorm.com>
 * @copyright    2020 Photon Storm Ltd.
 * @license      {@link https://opensource.org/licenses/MIT|MIT License}
 */
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const Circumference_1 = __importDefault(require("./Circumference"));
const CircumferencePoint_1 = __importDefault(require("./CircumferencePoint"));
const FromPercent_1 = __importDefault(require("../../math/FromPercent"));
const const_1 = __importDefault(require("../../math/const"));
/**
 * Returns an array of Point objects containing the coordinates of the points around the circumference of the Circle,
 * based on the given quantity or stepRate values.
 *
 * @function Phaser.Geom.Circle.GetPoints
 * @since 3.0.0
 *
 * @param {Phaser.Geom.Circle} circle - The Circle to get the points from.
 * @param {number} quantity - The amount of points to return. If a falsey value the quantity will be derived from the `stepRate` instead.
 * @param {number} [stepRate] - Sets the quantity by getting the circumference of the circle and dividing it by the stepRate.
 * @param {array} [output] - An array to insert the points in to. If not provided a new array will be created.
 *
 * @return {Phaser.Geom.Point[]} An array of Point objects pertaining to the points around the circumference of the circle.
 */
const GetPoints = (circle, quantity, stepRate, out) => {
    if (out === undefined) {
        out = [];
    }
    //  If quantity is a falsey value (false, null, 0, undefined, etc) then we calculate it based on the stepRate instead.
    if (!quantity && stepRate > 0) {
        quantity = (0, Circumference_1.default)(circle) / stepRate;
    }
    for (let i = 0; i < quantity; i++) {
        const angle = (0, FromPercent_1.default)(i / quantity, 0, const_1.default.PI2);
        out.push((0, CircumferencePoint_1.default)(circle, angle));
    }
    return out;
};
exports.default = GetPoints;
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