arcade-physics
Version:
Use Arcade Physics without Phaser.
39 lines • 1.56 kB
JavaScript
;
/**
* @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 Point_1 = __importDefault(require("./Point"));
/**
* Calculates the vector projection of `pointA` onto the nonzero `pointB`. This is the
* orthogonal projection of `pointA` onto a straight line paralle to `pointB`.
*
* @function Phaser.Geom.Point.ProjectUnit
* @since 3.0.0
*
* @generic {Phaser.Geom.Point} O - [out,$return]
*
* @param {Phaser.Geom.Point} pointA - Point A, to be projected onto Point B. Must be a normalized point with a magnitude of 1.
* @param {Phaser.Geom.Point} pointB - Point B, to have Point A projected upon it.
* @param {Phaser.Geom.Point} [out] - The Point object to store the position in. If not given, a new Point instance is created.
*
* @return {Phaser.Geom.Point} A unit Point object holding the coordinates of the vector projection of `pointA` onto `pointB`.
*/
const ProjectUnit = (pointA, pointB, out) => {
if (out === undefined) {
out = new Point_1.default();
}
const amt = pointA.x * pointB.x + pointA.y * pointB.y;
if (amt !== 0) {
out.x = amt * pointB.x;
out.y = amt * pointB.y;
}
return out;
};
exports.default = ProjectUnit;
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