PhysObject.js

import { Vector2 } from './Vector2.js';

/**
 * 2 dimensional physics object that can be affected by forces.
 */
export class PhysObject {
	/**
	 * Create PhysObject
	 * @param {Vector2} position            Position of the object in pixels. Defaults to (0.0, 0.0).
	 * @param {Vector2} velocity            Velocity of the object. Defaults to (0.0, 0.0).
	 * @param {number}  gravity             Acceleration of the object due to gravity. Defaults to 0.0.
	 * @param {Vector2} acceleration        Acceleration of the object. Defaults to (0, 0).
	 * @param {number}  mass                Mass of the object. Defaults to 1.0.
	 * @param {boolean} collidesWithWalls   Whether the object will collide with the canvas edges.
	 * @param {boolean} collidesWithObjects Whether the object will collide other objects.
	 * @param {boolean} isStatic            Whether the object is static, i.e., doesn't move.
	 */
	constructor(
		position = new Vector2(0, 0),
		velocity = new Vector2(0, 0),
		acceleration = new Vector2(0, 0),
		gravity = 0,
		mass = 1,
		drag = 0,
		collidesWithObjects = true,
		collidesWithWalls = true,
		isStatic = false
	) {
		this.position = position;
		this.gravity = gravity;
		this.velocity = velocity;
		this.acceleration = acceleration;
		this.mass = mass;
		this.drag = drag;
		this.collidesWithObjects = collidesWithObjects;
		this.collidesWithWalls = collidesWithWalls;
		this.onObjectCollison = function () {};
		this.onWallCollision = function () {};
		this.isStatic = isStatic;
	}

	/**
	 * Applies a force to the object. The "force" will remain until an equal and opposite
	 * force is applied or the acceleration is manually changed.
	 * @param {Vector2} force Vector2 representing the force to be applied.
	 */
	applyForce(force) {
		this.acceleration = this.acceleration.add(force.scalarDiv(this.mass));
	}
}