bubbles / files / src / physics / RigidBody.ts

RigidBody.ts

Blame: the commit that last changed each line · file · history

`dcc4757f` 2026-04-09 Pavel Safronov	1	import { Vector2 } from './Vector2.js';
	2
	3	export interface RigidBodyOptions {
	4	position: Vector2;
	5	radius: number;
	6	/** g/cm³ equivalent — water = 1.0; < 1 floats, > 1 sinks */
	7	density: number;
	8	/** Display label — emoji or short string */
	9	label: string;
`fc6e1fbf` 2026-04-09 Pavel Safronov	10	/** Optional pre-rendered texture drawn instead of label */
	11	texture?: HTMLCanvasElement;
	12	/** Permanent bodies are never evicted by the 12-body cap */
	13	permanent?: boolean;
`dcc4757f` 2026-04-09 Pavel Safronov	14	}
	15
	16	export class RigidBody {
	17	position: Vector2;
	18	velocity: Vector2;
	19	readonly radius: number;
	20	readonly density: number;
	21	readonly label: string;
`fc6e1fbf` 2026-04-09 Pavel Safronov	22	readonly texture: HTMLCanvasElement \| undefined;
	23	readonly permanent: boolean;
`dcc4757f` 2026-04-09 Pavel Safronov	24	/** Rotation angle in radians, for visual wobble */
	25	angle: number = 0;
	26	angularVelocity: number = 0;
	27	/** Unique id for removal tracking */
	28	readonly id: number;
	29
	30	private static _nextId = 0;
	31
	32	constructor(opts: RigidBodyOptions) {
	33	this.position = opts.position.clone();
	34	this.velocity = Vector2.zero();
	35	this.radius = opts.radius;
	36	this.density = opts.density;
	37	this.label = opts.label;
`fc6e1fbf` 2026-04-09 Pavel Safronov	38	this.texture = opts.texture;
	39	this.permanent = opts.permanent ?? false;
`dcc4757f` 2026-04-09 Pavel Safronov	40	this.id = RigidBody._nextId++;
	41	}
	42
	43	get mass(): number {
	44	return this.density * Math.PI * this.radius * this.radius;
	45	}
	46	}